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1257 lines
58 KiB
1257 lines
58 KiB
/*
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* Copyright (c) 1995, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.awt;
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import java.io.*;
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import java.lang.*;
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import java.util.*;
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import java.awt.image.ImageObserver;
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import java.text.AttributedCharacterIterator;
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/**
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* The <code>Graphics</code> class is the abstract base class for
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* all graphics contexts that allow an application to draw onto
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* components that are realized on various devices, as well as
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* onto off-screen images.
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* <p>
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* A <code>Graphics</code> object encapsulates state information needed
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* for the basic rendering operations that Java supports. This
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* state information includes the following properties:
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*
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* <ul>
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* <li>The <code>Component</code> object on which to draw.
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* <li>A translation origin for rendering and clipping coordinates.
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* <li>The current clip.
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* <li>The current color.
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* <li>The current font.
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* <li>The current logical pixel operation function (XOR or Paint).
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* <li>The current XOR alternation color
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* (see {@link Graphics#setXORMode}).
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* </ul>
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* <p>
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* Coordinates are infinitely thin and lie between the pixels of the
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* output device.
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* Operations that draw the outline of a figure operate by traversing
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* an infinitely thin path between pixels with a pixel-sized pen that hangs
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* down and to the right of the anchor point on the path.
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* Operations that fill a figure operate by filling the interior
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* of that infinitely thin path.
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* Operations that render horizontal text render the ascending
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* portion of character glyphs entirely above the baseline coordinate.
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* <p>
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* The graphics pen hangs down and to the right from the path it traverses.
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* This has the following implications:
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* <ul>
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* <li>If you draw a figure that covers a given rectangle, that
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* figure occupies one extra row of pixels on the right and bottom edges
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* as compared to filling a figure that is bounded by that same rectangle.
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* <li>If you draw a horizontal line along the same <i>y</i> coordinate as
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* the baseline of a line of text, that line is drawn entirely below
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* the text, except for any descenders.
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* </ul><p>
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* All coordinates that appear as arguments to the methods of this
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* <code>Graphics</code> object are considered relative to the
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* translation origin of this <code>Graphics</code> object prior to
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* the invocation of the method.
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* <p>
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* All rendering operations modify only pixels which lie within the
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* area bounded by the current clip, which is specified by a {@link Shape}
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* in user space and is controlled by the program using the
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* <code>Graphics</code> object. This <i>user clip</i>
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* is transformed into device space and combined with the
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* <i>device clip</i>, which is defined by the visibility of windows and
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* device extents. The combination of the user clip and device clip
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* defines the <i>composite clip</i>, which determines the final clipping
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* region. The user clip cannot be modified by the rendering
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* system to reflect the resulting composite clip. The user clip can only
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* be changed through the <code>setClip</code> or <code>clipRect</code>
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* methods.
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* All drawing or writing is done in the current color,
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* using the current paint mode, and in the current font.
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*
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* @author Sami Shaio
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* @author Arthur van Hoff
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* @see java.awt.Component
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* @see java.awt.Graphics#clipRect(int, int, int, int)
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* @see java.awt.Graphics#setColor(java.awt.Color)
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* @see java.awt.Graphics#setPaintMode()
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* @see java.awt.Graphics#setXORMode(java.awt.Color)
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* @see java.awt.Graphics#setFont(java.awt.Font)
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* @since JDK1.0
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*/
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public abstract class Graphics {
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/**
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* Constructs a new <code>Graphics</code> object.
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* This constructor is the default constructor for a graphics
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* context.
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* <p>
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* Since <code>Graphics</code> is an abstract class, applications
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* cannot call this constructor directly. Graphics contexts are
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* obtained from other graphics contexts or are created by calling
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* <code>getGraphics</code> on a component.
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* @see java.awt.Graphics#create()
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* @see java.awt.Component#getGraphics
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*/
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protected Graphics() {
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}
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/**
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* Creates a new <code>Graphics</code> object that is
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* a copy of this <code>Graphics</code> object.
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* @return a new graphics context that is a copy of
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* this graphics context.
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*/
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public abstract Graphics create();
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/**
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* Creates a new <code>Graphics</code> object based on this
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* <code>Graphics</code> object, but with a new translation and clip area.
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* The new <code>Graphics</code> object has its origin
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* translated to the specified point (<i>x</i>, <i>y</i>).
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* Its clip area is determined by the intersection of the original
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* clip area with the specified rectangle. The arguments are all
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* interpreted in the coordinate system of the original
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* <code>Graphics</code> object. The new graphics context is
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* identical to the original, except in two respects:
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*
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* <ul>
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* <li>
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* The new graphics context is translated by (<i>x</i>, <i>y</i>).
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* That is to say, the point (<code>0</code>, <code>0</code>) in the
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* new graphics context is the same as (<i>x</i>, <i>y</i>) in
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* the original graphics context.
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* <li>
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* The new graphics context has an additional clipping rectangle, in
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* addition to whatever (translated) clipping rectangle it inherited
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* from the original graphics context. The origin of the new clipping
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* rectangle is at (<code>0</code>, <code>0</code>), and its size
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* is specified by the <code>width</code> and <code>height</code>
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* arguments.
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* </ul>
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* <p>
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* @param x the <i>x</i> coordinate.
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* @param y the <i>y</i> coordinate.
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* @param width the width of the clipping rectangle.
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* @param height the height of the clipping rectangle.
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* @return a new graphics context.
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* @see java.awt.Graphics#translate
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* @see java.awt.Graphics#clipRect
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*/
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public Graphics create(int x, int y, int width, int height) {
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Graphics g = create();
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if (g == null) return null;
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g.translate(x, y);
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g.clipRect(0, 0, width, height);
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return g;
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}
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/**
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* Translates the origin of the graphics context to the point
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* (<i>x</i>, <i>y</i>) in the current coordinate system.
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* Modifies this graphics context so that its new origin corresponds
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* to the point (<i>x</i>, <i>y</i>) in this graphics context's
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* original coordinate system. All coordinates used in subsequent
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* rendering operations on this graphics context will be relative
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* to this new origin.
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* @param x the <i>x</i> coordinate.
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* @param y the <i>y</i> coordinate.
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*/
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public abstract void translate(int x, int y);
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/**
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* Gets this graphics context's current color.
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* @return this graphics context's current color.
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* @see java.awt.Color
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* @see java.awt.Graphics#setColor(Color)
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*/
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public abstract Color getColor();
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/**
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* Sets this graphics context's current color to the specified
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* color. All subsequent graphics operations using this graphics
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* context use this specified color.
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* @param c the new rendering color.
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* @see java.awt.Color
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* @see java.awt.Graphics#getColor
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*/
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public abstract void setColor(Color c);
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/**
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* Sets the paint mode of this graphics context to overwrite the
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* destination with this graphics context's current color.
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* This sets the logical pixel operation function to the paint or
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* overwrite mode. All subsequent rendering operations will
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* overwrite the destination with the current color.
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*/
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public abstract void setPaintMode();
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/**
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* Sets the paint mode of this graphics context to alternate between
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* this graphics context's current color and the new specified color.
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* This specifies that logical pixel operations are performed in the
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* XOR mode, which alternates pixels between the current color and
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* a specified XOR color.
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* <p>
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* When drawing operations are performed, pixels which are the
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* current color are changed to the specified color, and vice versa.
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* <p>
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* Pixels that are of colors other than those two colors are changed
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* in an unpredictable but reversible manner; if the same figure is
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* drawn twice, then all pixels are restored to their original values.
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* @param c1 the XOR alternation color
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*/
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public abstract void setXORMode(Color c1);
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/**
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* Gets the current font.
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* @return this graphics context's current font.
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* @see java.awt.Font
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* @see java.awt.Graphics#setFont(Font)
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*/
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public abstract Font getFont();
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/**
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* Sets this graphics context's font to the specified font.
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* All subsequent text operations using this graphics context
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* use this font. A null argument is silently ignored.
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* @param font the font.
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* @see java.awt.Graphics#getFont
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* @see java.awt.Graphics#drawString(java.lang.String, int, int)
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* @see java.awt.Graphics#drawBytes(byte[], int, int, int, int)
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* @see java.awt.Graphics#drawChars(char[], int, int, int, int)
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*/
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public abstract void setFont(Font font);
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/**
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* Gets the font metrics of the current font.
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* @return the font metrics of this graphics
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* context's current font.
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* @see java.awt.Graphics#getFont
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* @see java.awt.FontMetrics
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* @see java.awt.Graphics#getFontMetrics(Font)
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*/
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public FontMetrics getFontMetrics() {
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return getFontMetrics(getFont());
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}
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/**
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* Gets the font metrics for the specified font.
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* @return the font metrics for the specified font.
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* @param f the specified font
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* @see java.awt.Graphics#getFont
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* @see java.awt.FontMetrics
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* @see java.awt.Graphics#getFontMetrics()
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*/
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public abstract FontMetrics getFontMetrics(Font f);
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/**
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* Returns the bounding rectangle of the current clipping area.
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* This method refers to the user clip, which is independent of the
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* clipping associated with device bounds and window visibility.
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* If no clip has previously been set, or if the clip has been
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* cleared using <code>setClip(null)</code>, this method returns
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* <code>null</code>.
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* The coordinates in the rectangle are relative to the coordinate
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* system origin of this graphics context.
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* @return the bounding rectangle of the current clipping area,
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* or <code>null</code> if no clip is set.
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* @see java.awt.Graphics#getClip
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* @see java.awt.Graphics#clipRect
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* @see java.awt.Graphics#setClip(int, int, int, int)
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* @see java.awt.Graphics#setClip(Shape)
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* @since JDK1.1
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*/
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public abstract Rectangle getClipBounds();
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/**
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* Intersects the current clip with the specified rectangle.
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* The resulting clipping area is the intersection of the current
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* clipping area and the specified rectangle. If there is no
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* current clipping area, either because the clip has never been
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* set, or the clip has been cleared using <code>setClip(null)</code>,
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* the specified rectangle becomes the new clip.
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* This method sets the user clip, which is independent of the
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* clipping associated with device bounds and window visibility.
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* This method can only be used to make the current clip smaller.
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* To set the current clip larger, use any of the setClip methods.
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* Rendering operations have no effect outside of the clipping area.
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* @param x the x coordinate of the rectangle to intersect the clip with
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* @param y the y coordinate of the rectangle to intersect the clip with
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* @param width the width of the rectangle to intersect the clip with
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* @param height the height of the rectangle to intersect the clip with
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* @see #setClip(int, int, int, int)
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* @see #setClip(Shape)
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*/
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public abstract void clipRect(int x, int y, int width, int height);
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/**
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* Sets the current clip to the rectangle specified by the given
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* coordinates. This method sets the user clip, which is
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* independent of the clipping associated with device bounds
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* and window visibility.
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* Rendering operations have no effect outside of the clipping area.
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* @param x the <i>x</i> coordinate of the new clip rectangle.
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* @param y the <i>y</i> coordinate of the new clip rectangle.
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* @param width the width of the new clip rectangle.
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* @param height the height of the new clip rectangle.
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* @see java.awt.Graphics#clipRect
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* @see java.awt.Graphics#setClip(Shape)
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* @see java.awt.Graphics#getClip
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* @since JDK1.1
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*/
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public abstract void setClip(int x, int y, int width, int height);
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/**
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* Gets the current clipping area.
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* This method returns the user clip, which is independent of the
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* clipping associated with device bounds and window visibility.
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* If no clip has previously been set, or if the clip has been
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* cleared using <code>setClip(null)</code>, this method returns
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* <code>null</code>.
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* @return a <code>Shape</code> object representing the
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* current clipping area, or <code>null</code> if
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* no clip is set.
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* @see java.awt.Graphics#getClipBounds
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* @see java.awt.Graphics#clipRect
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* @see java.awt.Graphics#setClip(int, int, int, int)
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* @see java.awt.Graphics#setClip(Shape)
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* @since JDK1.1
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*/
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public abstract Shape getClip();
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/**
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* Sets the current clipping area to an arbitrary clip shape.
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* Not all objects that implement the <code>Shape</code>
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* interface can be used to set the clip. The only
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* <code>Shape</code> objects that are guaranteed to be
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* supported are <code>Shape</code> objects that are
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* obtained via the <code>getClip</code> method and via
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* <code>Rectangle</code> objects. This method sets the
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* user clip, which is independent of the clipping associated
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* with device bounds and window visibility.
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* @param clip the <code>Shape</code> to use to set the clip
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* @see java.awt.Graphics#getClip()
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* @see java.awt.Graphics#clipRect
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* @see java.awt.Graphics#setClip(int, int, int, int)
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* @since JDK1.1
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*/
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public abstract void setClip(Shape clip);
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/**
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* Copies an area of the component by a distance specified by
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* <code>dx</code> and <code>dy</code>. From the point specified
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* by <code>x</code> and <code>y</code>, this method
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* copies downwards and to the right. To copy an area of the
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* component to the left or upwards, specify a negative value for
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* <code>dx</code> or <code>dy</code>.
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* If a portion of the source rectangle lies outside the bounds
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* of the component, or is obscured by another window or component,
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* <code>copyArea</code> will be unable to copy the associated
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* pixels. The area that is omitted can be refreshed by calling
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* the component's <code>paint</code> method.
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* @param x the <i>x</i> coordinate of the source rectangle.
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* @param y the <i>y</i> coordinate of the source rectangle.
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* @param width the width of the source rectangle.
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* @param height the height of the source rectangle.
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* @param dx the horizontal distance to copy the pixels.
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* @param dy the vertical distance to copy the pixels.
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*/
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public abstract void copyArea(int x, int y, int width, int height,
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int dx, int dy);
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/**
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* Draws a line, using the current color, between the points
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* <code>(x1, y1)</code> and <code>(x2, y2)</code>
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* in this graphics context's coordinate system.
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* @param x1 the first point's <i>x</i> coordinate.
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* @param y1 the first point's <i>y</i> coordinate.
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* @param x2 the second point's <i>x</i> coordinate.
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* @param y2 the second point's <i>y</i> coordinate.
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*/
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public abstract void drawLine(int x1, int y1, int x2, int y2);
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/**
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* Fills the specified rectangle.
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* The left and right edges of the rectangle are at
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* <code>x</code> and <code>x + width - 1</code>.
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* The top and bottom edges are at
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* <code>y</code> and <code>y + height - 1</code>.
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* The resulting rectangle covers an area
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* <code>width</code> pixels wide by
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* <code>height</code> pixels tall.
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* The rectangle is filled using the graphics context's current color.
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* @param x the <i>x</i> coordinate
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* of the rectangle to be filled.
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* @param y the <i>y</i> coordinate
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* of the rectangle to be filled.
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* @param width the width of the rectangle to be filled.
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* @param height the height of the rectangle to be filled.
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* @see java.awt.Graphics#clearRect
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* @see java.awt.Graphics#drawRect
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*/
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public abstract void fillRect(int x, int y, int width, int height);
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/**
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* Draws the outline of the specified rectangle.
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* The left and right edges of the rectangle are at
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* <code>x</code> and <code>x + width</code>.
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* The top and bottom edges are at
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* <code>y</code> and <code>y + height</code>.
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* The rectangle is drawn using the graphics context's current color.
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* @param x the <i>x</i> coordinate
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* of the rectangle to be drawn.
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* @param y the <i>y</i> coordinate
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* of the rectangle to be drawn.
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* @param width the width of the rectangle to be drawn.
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* @param height the height of the rectangle to be drawn.
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* @see java.awt.Graphics#fillRect
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* @see java.awt.Graphics#clearRect
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*/
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public void drawRect(int x, int y, int width, int height) {
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if ((width < 0) || (height < 0)) {
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return;
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}
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if (height == 0 || width == 0) {
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drawLine(x, y, x + width, y + height);
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} else {
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drawLine(x, y, x + width - 1, y);
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drawLine(x + width, y, x + width, y + height - 1);
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drawLine(x + width, y + height, x + 1, y + height);
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drawLine(x, y + height, x, y + 1);
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}
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}
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/**
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* Clears the specified rectangle by filling it with the background
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* color of the current drawing surface. This operation does not
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* use the current paint mode.
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* <p>
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* Beginning with Java 1.1, the background color
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* of offscreen images may be system dependent. Applications should
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* use <code>setColor</code> followed by <code>fillRect</code> to
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* ensure that an offscreen image is cleared to a specific color.
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* @param x the <i>x</i> coordinate of the rectangle to clear.
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* @param y the <i>y</i> coordinate of the rectangle to clear.
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* @param width the width of the rectangle to clear.
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* @param height the height of the rectangle to clear.
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* @see java.awt.Graphics#fillRect(int, int, int, int)
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* @see java.awt.Graphics#drawRect
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* @see java.awt.Graphics#setColor(java.awt.Color)
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* @see java.awt.Graphics#setPaintMode
|
|
* @see java.awt.Graphics#setXORMode(java.awt.Color)
|
|
*/
|
|
public abstract void clearRect(int x, int y, int width, int height);
|
|
|
|
/**
|
|
* Draws an outlined round-cornered rectangle using this graphics
|
|
* context's current color. The left and right edges of the rectangle
|
|
* are at <code>x</code> and <code>x + width</code>,
|
|
* respectively. The top and bottom edges of the rectangle are at
|
|
* <code>y</code> and <code>y + height</code>.
|
|
* @param x the <i>x</i> coordinate of the rectangle to be drawn.
|
|
* @param y the <i>y</i> coordinate of the rectangle to be drawn.
|
|
* @param width the width of the rectangle to be drawn.
|
|
* @param height the height of the rectangle to be drawn.
|
|
* @param arcWidth the horizontal diameter of the arc
|
|
* at the four corners.
|
|
* @param arcHeight the vertical diameter of the arc
|
|
* at the four corners.
|
|
* @see java.awt.Graphics#fillRoundRect
|
|
*/
|
|
public abstract void drawRoundRect(int x, int y, int width, int height,
|
|
int arcWidth, int arcHeight);
|
|
|
|
/**
|
|
* Fills the specified rounded corner rectangle with the current color.
|
|
* The left and right edges of the rectangle
|
|
* are at <code>x</code> and <code>x + width - 1</code>,
|
|
* respectively. The top and bottom edges of the rectangle are at
|
|
* <code>y</code> and <code>y + height - 1</code>.
|
|
* @param x the <i>x</i> coordinate of the rectangle to be filled.
|
|
* @param y the <i>y</i> coordinate of the rectangle to be filled.
|
|
* @param width the width of the rectangle to be filled.
|
|
* @param height the height of the rectangle to be filled.
|
|
* @param arcWidth the horizontal diameter
|
|
* of the arc at the four corners.
|
|
* @param arcHeight the vertical diameter
|
|
* of the arc at the four corners.
|
|
* @see java.awt.Graphics#drawRoundRect
|
|
*/
|
|
public abstract void fillRoundRect(int x, int y, int width, int height,
|
|
int arcWidth, int arcHeight);
|
|
|
|
/**
|
|
* Draws a 3-D highlighted outline of the specified rectangle.
|
|
* The edges of the rectangle are highlighted so that they
|
|
* appear to be beveled and lit from the upper left corner.
|
|
* <p>
|
|
* The colors used for the highlighting effect are determined
|
|
* based on the current color.
|
|
* The resulting rectangle covers an area that is
|
|
* <code>width + 1</code> pixels wide
|
|
* by <code>height + 1</code> pixels tall.
|
|
* @param x the <i>x</i> coordinate of the rectangle to be drawn.
|
|
* @param y the <i>y</i> coordinate of the rectangle to be drawn.
|
|
* @param width the width of the rectangle to be drawn.
|
|
* @param height the height of the rectangle to be drawn.
|
|
* @param raised a boolean that determines whether the rectangle
|
|
* appears to be raised above the surface
|
|
* or sunk into the surface.
|
|
* @see java.awt.Graphics#fill3DRect
|
|
*/
|
|
public void draw3DRect(int x, int y, int width, int height,
|
|
boolean raised) {
|
|
Color c = getColor();
|
|
Color brighter = c.brighter();
|
|
Color darker = c.darker();
|
|
|
|
setColor(raised ? brighter : darker);
|
|
drawLine(x, y, x, y + height);
|
|
drawLine(x + 1, y, x + width - 1, y);
|
|
setColor(raised ? darker : brighter);
|
|
drawLine(x + 1, y + height, x + width, y + height);
|
|
drawLine(x + width, y, x + width, y + height - 1);
|
|
setColor(c);
|
|
}
|
|
|
|
/**
|
|
* Paints a 3-D highlighted rectangle filled with the current color.
|
|
* The edges of the rectangle will be highlighted so that it appears
|
|
* as if the edges were beveled and lit from the upper left corner.
|
|
* The colors used for the highlighting effect will be determined from
|
|
* the current color.
|
|
* @param x the <i>x</i> coordinate of the rectangle to be filled.
|
|
* @param y the <i>y</i> coordinate of the rectangle to be filled.
|
|
* @param width the width of the rectangle to be filled.
|
|
* @param height the height of the rectangle to be filled.
|
|
* @param raised a boolean value that determines whether the
|
|
* rectangle appears to be raised above the surface
|
|
* or etched into the surface.
|
|
* @see java.awt.Graphics#draw3DRect
|
|
*/
|
|
public void fill3DRect(int x, int y, int width, int height,
|
|
boolean raised) {
|
|
Color c = getColor();
|
|
Color brighter = c.brighter();
|
|
Color darker = c.darker();
|
|
|
|
if (!raised) {
|
|
setColor(darker);
|
|
}
|
|
fillRect(x+1, y+1, width-2, height-2);
|
|
setColor(raised ? brighter : darker);
|
|
drawLine(x, y, x, y + height - 1);
|
|
drawLine(x + 1, y, x + width - 2, y);
|
|
setColor(raised ? darker : brighter);
|
|
drawLine(x + 1, y + height - 1, x + width - 1, y + height - 1);
|
|
drawLine(x + width - 1, y, x + width - 1, y + height - 2);
|
|
setColor(c);
|
|
}
|
|
|
|
/**
|
|
* Draws the outline of an oval.
|
|
* The result is a circle or ellipse that fits within the
|
|
* rectangle specified by the <code>x</code>, <code>y</code>,
|
|
* <code>width</code>, and <code>height</code> arguments.
|
|
* <p>
|
|
* The oval covers an area that is
|
|
* <code>width + 1</code> pixels wide
|
|
* and <code>height + 1</code> pixels tall.
|
|
* @param x the <i>x</i> coordinate of the upper left
|
|
* corner of the oval to be drawn.
|
|
* @param y the <i>y</i> coordinate of the upper left
|
|
* corner of the oval to be drawn.
|
|
* @param width the width of the oval to be drawn.
|
|
* @param height the height of the oval to be drawn.
|
|
* @see java.awt.Graphics#fillOval
|
|
*/
|
|
public abstract void drawOval(int x, int y, int width, int height);
|
|
|
|
/**
|
|
* Fills an oval bounded by the specified rectangle with the
|
|
* current color.
|
|
* @param x the <i>x</i> coordinate of the upper left corner
|
|
* of the oval to be filled.
|
|
* @param y the <i>y</i> coordinate of the upper left corner
|
|
* of the oval to be filled.
|
|
* @param width the width of the oval to be filled.
|
|
* @param height the height of the oval to be filled.
|
|
* @see java.awt.Graphics#drawOval
|
|
*/
|
|
public abstract void fillOval(int x, int y, int width, int height);
|
|
|
|
/**
|
|
* Draws the outline of a circular or elliptical arc
|
|
* covering the specified rectangle.
|
|
* <p>
|
|
* The resulting arc begins at <code>startAngle</code> and extends
|
|
* for <code>arcAngle</code> degrees, using the current color.
|
|
* Angles are interpreted such that 0 degrees
|
|
* is at the 3 o'clock position.
|
|
* A positive value indicates a counter-clockwise rotation
|
|
* while a negative value indicates a clockwise rotation.
|
|
* <p>
|
|
* The center of the arc is the center of the rectangle whose origin
|
|
* is (<i>x</i>, <i>y</i>) and whose size is specified by the
|
|
* <code>width</code> and <code>height</code> arguments.
|
|
* <p>
|
|
* The resulting arc covers an area
|
|
* <code>width + 1</code> pixels wide
|
|
* by <code>height + 1</code> pixels tall.
|
|
* <p>
|
|
* The angles are specified relative to the non-square extents of
|
|
* the bounding rectangle such that 45 degrees always falls on the
|
|
* line from the center of the ellipse to the upper right corner of
|
|
* the bounding rectangle. As a result, if the bounding rectangle is
|
|
* noticeably longer in one axis than the other, the angles to the
|
|
* start and end of the arc segment will be skewed farther along the
|
|
* longer axis of the bounds.
|
|
* @param x the <i>x</i> coordinate of the
|
|
* upper-left corner of the arc to be drawn.
|
|
* @param y the <i>y</i> coordinate of the
|
|
* upper-left corner of the arc to be drawn.
|
|
* @param width the width of the arc to be drawn.
|
|
* @param height the height of the arc to be drawn.
|
|
* @param startAngle the beginning angle.
|
|
* @param arcAngle the angular extent of the arc,
|
|
* relative to the start angle.
|
|
* @see java.awt.Graphics#fillArc
|
|
*/
|
|
public abstract void drawArc(int x, int y, int width, int height,
|
|
int startAngle, int arcAngle);
|
|
|
|
/**
|
|
* Fills a circular or elliptical arc covering the specified rectangle.
|
|
* <p>
|
|
* The resulting arc begins at <code>startAngle</code> and extends
|
|
* for <code>arcAngle</code> degrees.
|
|
* Angles are interpreted such that 0 degrees
|
|
* is at the 3 o'clock position.
|
|
* A positive value indicates a counter-clockwise rotation
|
|
* while a negative value indicates a clockwise rotation.
|
|
* <p>
|
|
* The center of the arc is the center of the rectangle whose origin
|
|
* is (<i>x</i>, <i>y</i>) and whose size is specified by the
|
|
* <code>width</code> and <code>height</code> arguments.
|
|
* <p>
|
|
* The resulting arc covers an area
|
|
* <code>width + 1</code> pixels wide
|
|
* by <code>height + 1</code> pixels tall.
|
|
* <p>
|
|
* The angles are specified relative to the non-square extents of
|
|
* the bounding rectangle such that 45 degrees always falls on the
|
|
* line from the center of the ellipse to the upper right corner of
|
|
* the bounding rectangle. As a result, if the bounding rectangle is
|
|
* noticeably longer in one axis than the other, the angles to the
|
|
* start and end of the arc segment will be skewed farther along the
|
|
* longer axis of the bounds.
|
|
* @param x the <i>x</i> coordinate of the
|
|
* upper-left corner of the arc to be filled.
|
|
* @param y the <i>y</i> coordinate of the
|
|
* upper-left corner of the arc to be filled.
|
|
* @param width the width of the arc to be filled.
|
|
* @param height the height of the arc to be filled.
|
|
* @param startAngle the beginning angle.
|
|
* @param arcAngle the angular extent of the arc,
|
|
* relative to the start angle.
|
|
* @see java.awt.Graphics#drawArc
|
|
*/
|
|
public abstract void fillArc(int x, int y, int width, int height,
|
|
int startAngle, int arcAngle);
|
|
|
|
/**
|
|
* Draws a sequence of connected lines defined by
|
|
* arrays of <i>x</i> and <i>y</i> coordinates.
|
|
* Each pair of (<i>x</i>, <i>y</i>) coordinates defines a point.
|
|
* The figure is not closed if the first point
|
|
* differs from the last point.
|
|
* @param xPoints an array of <i>x</i> points
|
|
* @param yPoints an array of <i>y</i> points
|
|
* @param nPoints the total number of points
|
|
* @see java.awt.Graphics#drawPolygon(int[], int[], int)
|
|
* @since JDK1.1
|
|
*/
|
|
public abstract void drawPolyline(int xPoints[], int yPoints[],
|
|
int nPoints);
|
|
|
|
/**
|
|
* Draws a closed polygon defined by
|
|
* arrays of <i>x</i> and <i>y</i> coordinates.
|
|
* Each pair of (<i>x</i>, <i>y</i>) coordinates defines a point.
|
|
* <p>
|
|
* This method draws the polygon defined by <code>nPoint</code> line
|
|
* segments, where the first <code>nPoint - 1</code>
|
|
* line segments are line segments from
|
|
* <code>(xPoints[i - 1], yPoints[i - 1])</code>
|
|
* to <code>(xPoints[i], yPoints[i])</code>, for
|
|
* 1 ≤ <i>i</i> ≤ <code>nPoints</code>.
|
|
* The figure is automatically closed by drawing a line connecting
|
|
* the final point to the first point, if those points are different.
|
|
* @param xPoints a an array of <code>x</code> coordinates.
|
|
* @param yPoints a an array of <code>y</code> coordinates.
|
|
* @param nPoints a the total number of points.
|
|
* @see java.awt.Graphics#fillPolygon
|
|
* @see java.awt.Graphics#drawPolyline
|
|
*/
|
|
public abstract void drawPolygon(int xPoints[], int yPoints[],
|
|
int nPoints);
|
|
|
|
/**
|
|
* Draws the outline of a polygon defined by the specified
|
|
* <code>Polygon</code> object.
|
|
* @param p the polygon to draw.
|
|
* @see java.awt.Graphics#fillPolygon
|
|
* @see java.awt.Graphics#drawPolyline
|
|
*/
|
|
public void drawPolygon(Polygon p) {
|
|
drawPolygon(p.xpoints, p.ypoints, p.npoints);
|
|
}
|
|
|
|
/**
|
|
* Fills a closed polygon defined by
|
|
* arrays of <i>x</i> and <i>y</i> coordinates.
|
|
* <p>
|
|
* This method draws the polygon defined by <code>nPoint</code> line
|
|
* segments, where the first <code>nPoint - 1</code>
|
|
* line segments are line segments from
|
|
* <code>(xPoints[i - 1], yPoints[i - 1])</code>
|
|
* to <code>(xPoints[i], yPoints[i])</code>, for
|
|
* 1 ≤ <i>i</i> ≤ <code>nPoints</code>.
|
|
* The figure is automatically closed by drawing a line connecting
|
|
* the final point to the first point, if those points are different.
|
|
* <p>
|
|
* The area inside the polygon is defined using an
|
|
* even-odd fill rule, also known as the alternating rule.
|
|
* @param xPoints a an array of <code>x</code> coordinates.
|
|
* @param yPoints a an array of <code>y</code> coordinates.
|
|
* @param nPoints a the total number of points.
|
|
* @see java.awt.Graphics#drawPolygon(int[], int[], int)
|
|
*/
|
|
public abstract void fillPolygon(int xPoints[], int yPoints[],
|
|
int nPoints);
|
|
|
|
/**
|
|
* Fills the polygon defined by the specified Polygon object with
|
|
* the graphics context's current color.
|
|
* <p>
|
|
* The area inside the polygon is defined using an
|
|
* even-odd fill rule, also known as the alternating rule.
|
|
* @param p the polygon to fill.
|
|
* @see java.awt.Graphics#drawPolygon(int[], int[], int)
|
|
*/
|
|
public void fillPolygon(Polygon p) {
|
|
fillPolygon(p.xpoints, p.ypoints, p.npoints);
|
|
}
|
|
|
|
/**
|
|
* Draws the text given by the specified string, using this
|
|
* graphics context's current font and color. The baseline of the
|
|
* leftmost character is at position (<i>x</i>, <i>y</i>) in this
|
|
* graphics context's coordinate system.
|
|
* @param str the string to be drawn.
|
|
* @param x the <i>x</i> coordinate.
|
|
* @param y the <i>y</i> coordinate.
|
|
* @throws NullPointerException if <code>str</code> is <code>null</code>.
|
|
* @see java.awt.Graphics#drawBytes
|
|
* @see java.awt.Graphics#drawChars
|
|
*/
|
|
public abstract void drawString(String str, int x, int y);
|
|
|
|
/**
|
|
* Renders the text of the specified iterator applying its attributes
|
|
* in accordance with the specification of the
|
|
* {@link java.awt.font.TextAttribute TextAttribute} class.
|
|
* <p>
|
|
* The baseline of the leftmost character is at position
|
|
* (<i>x</i>, <i>y</i>) in this graphics context's coordinate system.
|
|
* @param iterator the iterator whose text is to be drawn
|
|
* @param x the <i>x</i> coordinate.
|
|
* @param y the <i>y</i> coordinate.
|
|
* @throws NullPointerException if <code>iterator</code> is
|
|
* <code>null</code>.
|
|
* @see java.awt.Graphics#drawBytes
|
|
* @see java.awt.Graphics#drawChars
|
|
*/
|
|
public abstract void drawString(AttributedCharacterIterator iterator,
|
|
int x, int y);
|
|
|
|
/**
|
|
* Draws the text given by the specified character array, using this
|
|
* graphics context's current font and color. The baseline of the
|
|
* first character is at position (<i>x</i>, <i>y</i>) in this
|
|
* graphics context's coordinate system.
|
|
* @param data the array of characters to be drawn
|
|
* @param offset the start offset in the data
|
|
* @param length the number of characters to be drawn
|
|
* @param x the <i>x</i> coordinate of the baseline of the text
|
|
* @param y the <i>y</i> coordinate of the baseline of the text
|
|
* @throws NullPointerException if <code>data</code> is <code>null</code>.
|
|
* @throws IndexOutOfBoundsException if <code>offset</code> or
|
|
* <code>length</code>is less than zero, or
|
|
* <code>offset+length</code> is greater than the length of the
|
|
* <code>data</code> array.
|
|
* @see java.awt.Graphics#drawBytes
|
|
* @see java.awt.Graphics#drawString
|
|
*/
|
|
public void drawChars(char data[], int offset, int length, int x, int y) {
|
|
drawString(new String(data, offset, length), x, y);
|
|
}
|
|
|
|
/**
|
|
* Draws the text given by the specified byte array, using this
|
|
* graphics context's current font and color. The baseline of the
|
|
* first character is at position (<i>x</i>, <i>y</i>) in this
|
|
* graphics context's coordinate system.
|
|
* <p>
|
|
* Use of this method is not recommended as each byte is interpreted
|
|
* as a Unicode code point in the range 0 to 255, and so can only be
|
|
* used to draw Latin characters in that range.
|
|
* @param data the data to be drawn
|
|
* @param offset the start offset in the data
|
|
* @param length the number of bytes that are drawn
|
|
* @param x the <i>x</i> coordinate of the baseline of the text
|
|
* @param y the <i>y</i> coordinate of the baseline of the text
|
|
* @throws NullPointerException if <code>data</code> is <code>null</code>.
|
|
* @throws IndexOutOfBoundsException if <code>offset</code> or
|
|
* <code>length</code>is less than zero, or <code>offset+length</code>
|
|
* is greater than the length of the <code>data</code> array.
|
|
* @see java.awt.Graphics#drawChars
|
|
* @see java.awt.Graphics#drawString
|
|
*/
|
|
public void drawBytes(byte data[], int offset, int length, int x, int y) {
|
|
drawString(new String(data, 0, offset, length), x, y);
|
|
}
|
|
|
|
/**
|
|
* Draws as much of the specified image as is currently available.
|
|
* The image is drawn with its top-left corner at
|
|
* (<i>x</i>, <i>y</i>) in this graphics context's coordinate
|
|
* space. Transparent pixels in the image do not affect whatever
|
|
* pixels are already there.
|
|
* <p>
|
|
* This method returns immediately in all cases, even if the
|
|
* complete image has not yet been loaded, and it has not been dithered
|
|
* and converted for the current output device.
|
|
* <p>
|
|
* If the image has completely loaded and its pixels are
|
|
* no longer being changed, then
|
|
* <code>drawImage</code> returns <code>true</code>.
|
|
* Otherwise, <code>drawImage</code> returns <code>false</code>
|
|
* and as more of
|
|
* the image becomes available
|
|
* or it is time to draw another frame of animation,
|
|
* the process that loads the image notifies
|
|
* the specified image observer.
|
|
* @param img the specified image to be drawn. This method does
|
|
* nothing if <code>img</code> is null.
|
|
* @param x the <i>x</i> coordinate.
|
|
* @param y the <i>y</i> coordinate.
|
|
* @param observer object to be notified as more of
|
|
* the image is converted.
|
|
* @return <code>false</code> if the image pixels are still changing;
|
|
* <code>true</code> otherwise.
|
|
* @see java.awt.Image
|
|
* @see java.awt.image.ImageObserver
|
|
* @see java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)
|
|
*/
|
|
public abstract boolean drawImage(Image img, int x, int y,
|
|
ImageObserver observer);
|
|
|
|
/**
|
|
* Draws as much of the specified image as has already been scaled
|
|
* to fit inside the specified rectangle.
|
|
* <p>
|
|
* The image is drawn inside the specified rectangle of this
|
|
* graphics context's coordinate space, and is scaled if
|
|
* necessary. Transparent pixels do not affect whatever pixels
|
|
* are already there.
|
|
* <p>
|
|
* This method returns immediately in all cases, even if the
|
|
* entire image has not yet been scaled, dithered, and converted
|
|
* for the current output device.
|
|
* If the current output representation is not yet complete, then
|
|
* <code>drawImage</code> returns <code>false</code>. As more of
|
|
* the image becomes available, the process that loads the image notifies
|
|
* the image observer by calling its <code>imageUpdate</code> method.
|
|
* <p>
|
|
* A scaled version of an image will not necessarily be
|
|
* available immediately just because an unscaled version of the
|
|
* image has been constructed for this output device. Each size of
|
|
* the image may be cached separately and generated from the original
|
|
* data in a separate image production sequence.
|
|
* @param img the specified image to be drawn. This method does
|
|
* nothing if <code>img</code> is null.
|
|
* @param x the <i>x</i> coordinate.
|
|
* @param y the <i>y</i> coordinate.
|
|
* @param width the width of the rectangle.
|
|
* @param height the height of the rectangle.
|
|
* @param observer object to be notified as more of
|
|
* the image is converted.
|
|
* @return <code>false</code> if the image pixels are still changing;
|
|
* <code>true</code> otherwise.
|
|
* @see java.awt.Image
|
|
* @see java.awt.image.ImageObserver
|
|
* @see java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)
|
|
*/
|
|
public abstract boolean drawImage(Image img, int x, int y,
|
|
int width, int height,
|
|
ImageObserver observer);
|
|
|
|
/**
|
|
* Draws as much of the specified image as is currently available.
|
|
* The image is drawn with its top-left corner at
|
|
* (<i>x</i>, <i>y</i>) in this graphics context's coordinate
|
|
* space. Transparent pixels are drawn in the specified
|
|
* background color.
|
|
* <p>
|
|
* This operation is equivalent to filling a rectangle of the
|
|
* width and height of the specified image with the given color and then
|
|
* drawing the image on top of it, but possibly more efficient.
|
|
* <p>
|
|
* This method returns immediately in all cases, even if the
|
|
* complete image has not yet been loaded, and it has not been dithered
|
|
* and converted for the current output device.
|
|
* <p>
|
|
* If the image has completely loaded and its pixels are
|
|
* no longer being changed, then
|
|
* <code>drawImage</code> returns <code>true</code>.
|
|
* Otherwise, <code>drawImage</code> returns <code>false</code>
|
|
* and as more of
|
|
* the image becomes available
|
|
* or it is time to draw another frame of animation,
|
|
* the process that loads the image notifies
|
|
* the specified image observer.
|
|
* @param img the specified image to be drawn. This method does
|
|
* nothing if <code>img</code> is null.
|
|
* @param x the <i>x</i> coordinate.
|
|
* @param y the <i>y</i> coordinate.
|
|
* @param bgcolor the background color to paint under the
|
|
* non-opaque portions of the image.
|
|
* @param observer object to be notified as more of
|
|
* the image is converted.
|
|
* @return <code>false</code> if the image pixels are still changing;
|
|
* <code>true</code> otherwise.
|
|
* @see java.awt.Image
|
|
* @see java.awt.image.ImageObserver
|
|
* @see java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)
|
|
*/
|
|
public abstract boolean drawImage(Image img, int x, int y,
|
|
Color bgcolor,
|
|
ImageObserver observer);
|
|
|
|
/**
|
|
* Draws as much of the specified image as has already been scaled
|
|
* to fit inside the specified rectangle.
|
|
* <p>
|
|
* The image is drawn inside the specified rectangle of this
|
|
* graphics context's coordinate space, and is scaled if
|
|
* necessary. Transparent pixels are drawn in the specified
|
|
* background color.
|
|
* This operation is equivalent to filling a rectangle of the
|
|
* width and height of the specified image with the given color and then
|
|
* drawing the image on top of it, but possibly more efficient.
|
|
* <p>
|
|
* This method returns immediately in all cases, even if the
|
|
* entire image has not yet been scaled, dithered, and converted
|
|
* for the current output device.
|
|
* If the current output representation is not yet complete then
|
|
* <code>drawImage</code> returns <code>false</code>. As more of
|
|
* the image becomes available, the process that loads the image notifies
|
|
* the specified image observer.
|
|
* <p>
|
|
* A scaled version of an image will not necessarily be
|
|
* available immediately just because an unscaled version of the
|
|
* image has been constructed for this output device. Each size of
|
|
* the image may be cached separately and generated from the original
|
|
* data in a separate image production sequence.
|
|
* @param img the specified image to be drawn. This method does
|
|
* nothing if <code>img</code> is null.
|
|
* @param x the <i>x</i> coordinate.
|
|
* @param y the <i>y</i> coordinate.
|
|
* @param width the width of the rectangle.
|
|
* @param height the height of the rectangle.
|
|
* @param bgcolor the background color to paint under the
|
|
* non-opaque portions of the image.
|
|
* @param observer object to be notified as more of
|
|
* the image is converted.
|
|
* @return <code>false</code> if the image pixels are still changing;
|
|
* <code>true</code> otherwise.
|
|
* @see java.awt.Image
|
|
* @see java.awt.image.ImageObserver
|
|
* @see java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)
|
|
*/
|
|
public abstract boolean drawImage(Image img, int x, int y,
|
|
int width, int height,
|
|
Color bgcolor,
|
|
ImageObserver observer);
|
|
|
|
/**
|
|
* Draws as much of the specified area of the specified image as is
|
|
* currently available, scaling it on the fly to fit inside the
|
|
* specified area of the destination drawable surface. Transparent pixels
|
|
* do not affect whatever pixels are already there.
|
|
* <p>
|
|
* This method returns immediately in all cases, even if the
|
|
* image area to be drawn has not yet been scaled, dithered, and converted
|
|
* for the current output device.
|
|
* If the current output representation is not yet complete then
|
|
* <code>drawImage</code> returns <code>false</code>. As more of
|
|
* the image becomes available, the process that loads the image notifies
|
|
* the specified image observer.
|
|
* <p>
|
|
* This method always uses the unscaled version of the image
|
|
* to render the scaled rectangle and performs the required
|
|
* scaling on the fly. It does not use a cached, scaled version
|
|
* of the image for this operation. Scaling of the image from source
|
|
* to destination is performed such that the first coordinate
|
|
* of the source rectangle is mapped to the first coordinate of
|
|
* the destination rectangle, and the second source coordinate is
|
|
* mapped to the second destination coordinate. The subimage is
|
|
* scaled and flipped as needed to preserve those mappings.
|
|
* @param img the specified image to be drawn. This method does
|
|
* nothing if <code>img</code> is null.
|
|
* @param dx1 the <i>x</i> coordinate of the first corner of the
|
|
* destination rectangle.
|
|
* @param dy1 the <i>y</i> coordinate of the first corner of the
|
|
* destination rectangle.
|
|
* @param dx2 the <i>x</i> coordinate of the second corner of the
|
|
* destination rectangle.
|
|
* @param dy2 the <i>y</i> coordinate of the second corner of the
|
|
* destination rectangle.
|
|
* @param sx1 the <i>x</i> coordinate of the first corner of the
|
|
* source rectangle.
|
|
* @param sy1 the <i>y</i> coordinate of the first corner of the
|
|
* source rectangle.
|
|
* @param sx2 the <i>x</i> coordinate of the second corner of the
|
|
* source rectangle.
|
|
* @param sy2 the <i>y</i> coordinate of the second corner of the
|
|
* source rectangle.
|
|
* @param observer object to be notified as more of the image is
|
|
* scaled and converted.
|
|
* @return <code>false</code> if the image pixels are still changing;
|
|
* <code>true</code> otherwise.
|
|
* @see java.awt.Image
|
|
* @see java.awt.image.ImageObserver
|
|
* @see java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)
|
|
* @since JDK1.1
|
|
*/
|
|
public abstract boolean drawImage(Image img,
|
|
int dx1, int dy1, int dx2, int dy2,
|
|
int sx1, int sy1, int sx2, int sy2,
|
|
ImageObserver observer);
|
|
|
|
/**
|
|
* Draws as much of the specified area of the specified image as is
|
|
* currently available, scaling it on the fly to fit inside the
|
|
* specified area of the destination drawable surface.
|
|
* <p>
|
|
* Transparent pixels are drawn in the specified background color.
|
|
* This operation is equivalent to filling a rectangle of the
|
|
* width and height of the specified image with the given color and then
|
|
* drawing the image on top of it, but possibly more efficient.
|
|
* <p>
|
|
* This method returns immediately in all cases, even if the
|
|
* image area to be drawn has not yet been scaled, dithered, and converted
|
|
* for the current output device.
|
|
* If the current output representation is not yet complete then
|
|
* <code>drawImage</code> returns <code>false</code>. As more of
|
|
* the image becomes available, the process that loads the image notifies
|
|
* the specified image observer.
|
|
* <p>
|
|
* This method always uses the unscaled version of the image
|
|
* to render the scaled rectangle and performs the required
|
|
* scaling on the fly. It does not use a cached, scaled version
|
|
* of the image for this operation. Scaling of the image from source
|
|
* to destination is performed such that the first coordinate
|
|
* of the source rectangle is mapped to the first coordinate of
|
|
* the destination rectangle, and the second source coordinate is
|
|
* mapped to the second destination coordinate. The subimage is
|
|
* scaled and flipped as needed to preserve those mappings.
|
|
* @param img the specified image to be drawn. This method does
|
|
* nothing if <code>img</code> is null.
|
|
* @param dx1 the <i>x</i> coordinate of the first corner of the
|
|
* destination rectangle.
|
|
* @param dy1 the <i>y</i> coordinate of the first corner of the
|
|
* destination rectangle.
|
|
* @param dx2 the <i>x</i> coordinate of the second corner of the
|
|
* destination rectangle.
|
|
* @param dy2 the <i>y</i> coordinate of the second corner of the
|
|
* destination rectangle.
|
|
* @param sx1 the <i>x</i> coordinate of the first corner of the
|
|
* source rectangle.
|
|
* @param sy1 the <i>y</i> coordinate of the first corner of the
|
|
* source rectangle.
|
|
* @param sx2 the <i>x</i> coordinate of the second corner of the
|
|
* source rectangle.
|
|
* @param sy2 the <i>y</i> coordinate of the second corner of the
|
|
* source rectangle.
|
|
* @param bgcolor the background color to paint under the
|
|
* non-opaque portions of the image.
|
|
* @param observer object to be notified as more of the image is
|
|
* scaled and converted.
|
|
* @return <code>false</code> if the image pixels are still changing;
|
|
* <code>true</code> otherwise.
|
|
* @see java.awt.Image
|
|
* @see java.awt.image.ImageObserver
|
|
* @see java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)
|
|
* @since JDK1.1
|
|
*/
|
|
public abstract boolean drawImage(Image img,
|
|
int dx1, int dy1, int dx2, int dy2,
|
|
int sx1, int sy1, int sx2, int sy2,
|
|
Color bgcolor,
|
|
ImageObserver observer);
|
|
|
|
/**
|
|
* Disposes of this graphics context and releases
|
|
* any system resources that it is using.
|
|
* A <code>Graphics</code> object cannot be used after
|
|
* <code>dispose</code>has been called.
|
|
* <p>
|
|
* When a Java program runs, a large number of <code>Graphics</code>
|
|
* objects can be created within a short time frame.
|
|
* Although the finalization process of the garbage collector
|
|
* also disposes of the same system resources, it is preferable
|
|
* to manually free the associated resources by calling this
|
|
* method rather than to rely on a finalization process which
|
|
* may not run to completion for a long period of time.
|
|
* <p>
|
|
* Graphics objects which are provided as arguments to the
|
|
* <code>paint</code> and <code>update</code> methods
|
|
* of components are automatically released by the system when
|
|
* those methods return. For efficiency, programmers should
|
|
* call <code>dispose</code> when finished using
|
|
* a <code>Graphics</code> object only if it was created
|
|
* directly from a component or another <code>Graphics</code> object.
|
|
* @see java.awt.Graphics#finalize
|
|
* @see java.awt.Component#paint
|
|
* @see java.awt.Component#update
|
|
* @see java.awt.Component#getGraphics
|
|
* @see java.awt.Graphics#create
|
|
*/
|
|
public abstract void dispose();
|
|
|
|
/**
|
|
* Disposes of this graphics context once it is no longer referenced.
|
|
* @see #dispose
|
|
*/
|
|
public void finalize() {
|
|
dispose();
|
|
}
|
|
|
|
/**
|
|
* Returns a <code>String</code> object representing this
|
|
* <code>Graphics</code> object's value.
|
|
* @return a string representation of this graphics context.
|
|
*/
|
|
public String toString() {
|
|
return getClass().getName() + "[font=" + getFont() + ",color=" + getColor() + "]";
|
|
}
|
|
|
|
/**
|
|
* Returns the bounding rectangle of the current clipping area.
|
|
* @return the bounding rectangle of the current clipping area
|
|
* or <code>null</code> if no clip is set.
|
|
* @deprecated As of JDK version 1.1,
|
|
* replaced by <code>getClipBounds()</code>.
|
|
*/
|
|
@Deprecated
|
|
public Rectangle getClipRect() {
|
|
return getClipBounds();
|
|
}
|
|
|
|
/**
|
|
* Returns true if the specified rectangular area might intersect
|
|
* the current clipping area.
|
|
* The coordinates of the specified rectangular area are in the
|
|
* user coordinate space and are relative to the coordinate
|
|
* system origin of this graphics context.
|
|
* This method may use an algorithm that calculates a result quickly
|
|
* but which sometimes might return true even if the specified
|
|
* rectangular area does not intersect the clipping area.
|
|
* The specific algorithm employed may thus trade off accuracy for
|
|
* speed, but it will never return false unless it can guarantee
|
|
* that the specified rectangular area does not intersect the
|
|
* current clipping area.
|
|
* The clipping area used by this method can represent the
|
|
* intersection of the user clip as specified through the clip
|
|
* methods of this graphics context as well as the clipping
|
|
* associated with the device or image bounds and window visibility.
|
|
*
|
|
* @param x the x coordinate of the rectangle to test against the clip
|
|
* @param y the y coordinate of the rectangle to test against the clip
|
|
* @param width the width of the rectangle to test against the clip
|
|
* @param height the height of the rectangle to test against the clip
|
|
* @return <code>true</code> if the specified rectangle intersects
|
|
* the bounds of the current clip; <code>false</code>
|
|
* otherwise.
|
|
*/
|
|
public boolean hitClip(int x, int y, int width, int height) {
|
|
// Note, this implementation is not very efficient.
|
|
// Subclasses should override this method and calculate
|
|
// the results more directly.
|
|
Rectangle clipRect = getClipBounds();
|
|
if (clipRect == null) {
|
|
return true;
|
|
}
|
|
return clipRect.intersects(x, y, width, height);
|
|
}
|
|
|
|
/**
|
|
* Returns the bounding rectangle of the current clipping area.
|
|
* The coordinates in the rectangle are relative to the coordinate
|
|
* system origin of this graphics context. This method differs
|
|
* from {@link #getClipBounds() getClipBounds} in that an existing
|
|
* rectangle is used instead of allocating a new one.
|
|
* This method refers to the user clip, which is independent of the
|
|
* clipping associated with device bounds and window visibility.
|
|
* If no clip has previously been set, or if the clip has been
|
|
* cleared using <code>setClip(null)</code>, this method returns the
|
|
* specified <code>Rectangle</code>.
|
|
* @param r the rectangle where the current clipping area is
|
|
* copied to. Any current values in this rectangle are
|
|
* overwritten.
|
|
* @return the bounding rectangle of the current clipping area.
|
|
*/
|
|
public Rectangle getClipBounds(Rectangle r) {
|
|
// Note, this implementation is not very efficient.
|
|
// Subclasses should override this method and avoid
|
|
// the allocation overhead of getClipBounds().
|
|
Rectangle clipRect = getClipBounds();
|
|
if (clipRect != null) {
|
|
r.x = clipRect.x;
|
|
r.y = clipRect.y;
|
|
r.width = clipRect.width;
|
|
r.height = clipRect.height;
|
|
} else if (r == null) {
|
|
throw new NullPointerException("null rectangle parameter");
|
|
}
|
|
return r;
|
|
}
|
|
}
|