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1217 lines
43 KiB
1217 lines
43 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.awt.geom.Rectangle2D;
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import java.beans.Transient;
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/**
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* A <code>Rectangle</code> specifies an area in a coordinate space that is
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* enclosed by the <code>Rectangle</code> object's upper-left point
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* {@code (x,y)}
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* in the coordinate space, its width, and its height.
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* <p>
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* A <code>Rectangle</code> object's <code>width</code> and
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* <code>height</code> are <code>public</code> fields. The constructors
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* that create a <code>Rectangle</code>, and the methods that can modify
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* one, do not prevent setting a negative value for width or height.
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* <p>
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* <a name="Empty">
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* A {@code Rectangle} whose width or height is exactly zero has location
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* along those axes with zero dimension, but is otherwise considered empty.
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* The {@link #isEmpty} method will return true for such a {@code Rectangle}.
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* Methods which test if an empty {@code Rectangle} contains or intersects
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* a point or rectangle will always return false if either dimension is zero.
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* Methods which combine such a {@code Rectangle} with a point or rectangle
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* will include the location of the {@code Rectangle} on that axis in the
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* result as if the {@link #add(Point)} method were being called.
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* </a>
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* <p>
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* <a name="NonExistant">
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* A {@code Rectangle} whose width or height is negative has neither
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* location nor dimension along those axes with negative dimensions.
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* Such a {@code Rectangle} is treated as non-existant along those axes.
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* Such a {@code Rectangle} is also empty with respect to containment
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* calculations and methods which test if it contains or intersects a
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* point or rectangle will always return false.
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* Methods which combine such a {@code Rectangle} with a point or rectangle
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* will ignore the {@code Rectangle} entirely in generating the result.
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* If two {@code Rectangle} objects are combined and each has a negative
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* dimension, the result will have at least one negative dimension.
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* </a>
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* <p>
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* Methods which affect only the location of a {@code Rectangle} will
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* operate on its location regardless of whether or not it has a negative
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* or zero dimension along either axis.
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* <p>
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* Note that a {@code Rectangle} constructed with the default no-argument
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* constructor will have dimensions of {@code 0x0} and therefore be empty.
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* That {@code Rectangle} will still have a location of {@code (0,0)} and
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* will contribute that location to the union and add operations.
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* Code attempting to accumulate the bounds of a set of points should
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* therefore initially construct the {@code Rectangle} with a specifically
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* negative width and height or it should use the first point in the set
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* to construct the {@code Rectangle}.
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* For example:
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* <pre>{@code
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* Rectangle bounds = new Rectangle(0, 0, -1, -1);
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* for (int i = 0; i < points.length; i++) {
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* bounds.add(points[i]);
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* }
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* }</pre>
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* or if we know that the points array contains at least one point:
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* <pre>{@code
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* Rectangle bounds = new Rectangle(points[0]);
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* for (int i = 1; i < points.length; i++) {
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* bounds.add(points[i]);
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* }
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* }</pre>
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* <p>
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* This class uses 32-bit integers to store its location and dimensions.
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* Frequently operations may produce a result that exceeds the range of
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* a 32-bit integer.
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* The methods will calculate their results in a way that avoids any
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* 32-bit overflow for intermediate results and then choose the best
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* representation to store the final results back into the 32-bit fields
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* which hold the location and dimensions.
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* The location of the result will be stored into the {@link #x} and
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* {@link #y} fields by clipping the true result to the nearest 32-bit value.
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* The values stored into the {@link #width} and {@link #height} dimension
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* fields will be chosen as the 32-bit values that encompass the largest
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* part of the true result as possible.
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* Generally this means that the dimension will be clipped independently
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* to the range of 32-bit integers except that if the location had to be
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* moved to store it into its pair of 32-bit fields then the dimensions
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* will be adjusted relative to the "best representation" of the location.
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* If the true result had a negative dimension and was therefore
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* non-existant along one or both axes, the stored dimensions will be
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* negative numbers in those axes.
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* If the true result had a location that could be represented within
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* the range of 32-bit integers, but zero dimension along one or both
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* axes, then the stored dimensions will be zero in those axes.
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*
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* @author Sami Shaio
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* @since 1.0
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*/
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public class Rectangle extends Rectangle2D
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implements Shape, java.io.Serializable
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{
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/**
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* The X coordinate of the upper-left corner of the <code>Rectangle</code>.
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*
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* @serial
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* @see #setLocation(int, int)
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* @see #getLocation()
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* @since 1.0
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*/
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public int x;
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/**
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* The Y coordinate of the upper-left corner of the <code>Rectangle</code>.
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*
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* @serial
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* @see #setLocation(int, int)
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* @see #getLocation()
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* @since 1.0
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*/
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public int y;
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/**
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* The width of the <code>Rectangle</code>.
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* @serial
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* @see #setSize(int, int)
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* @see #getSize()
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* @since 1.0
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*/
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public int width;
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/**
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* The height of the <code>Rectangle</code>.
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*
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* @serial
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* @see #setSize(int, int)
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* @see #getSize()
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* @since 1.0
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*/
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public int height;
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/*
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* JDK 1.1 serialVersionUID
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*/
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private static final long serialVersionUID = -4345857070255674764L;
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/**
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* Initialize JNI field and method IDs
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*/
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private static native void initIDs();
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static {
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/* ensure that the necessary native libraries are loaded */
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Toolkit.loadLibraries();
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if (!GraphicsEnvironment.isHeadless()) {
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initIDs();
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}
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}
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/**
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* Constructs a new <code>Rectangle</code> whose upper-left corner
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* is at (0, 0) in the coordinate space, and whose width and
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* height are both zero.
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*/
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public Rectangle() {
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this(0, 0, 0, 0);
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}
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/**
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* Constructs a new <code>Rectangle</code>, initialized to match
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* the values of the specified <code>Rectangle</code>.
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* @param r the <code>Rectangle</code> from which to copy initial values
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* to a newly constructed <code>Rectangle</code>
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* @since 1.1
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*/
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public Rectangle(Rectangle r) {
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this(r.x, r.y, r.width, r.height);
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}
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/**
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* Constructs a new <code>Rectangle</code> whose upper-left corner is
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* specified as
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* {@code (x,y)} and whose width and height
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* are specified by the arguments of the same name.
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* @param x the specified X coordinate
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* @param y the specified Y coordinate
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* @param width the width of the <code>Rectangle</code>
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* @param height the height of the <code>Rectangle</code>
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* @since 1.0
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*/
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public Rectangle(int x, int y, int width, int height) {
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this.x = x;
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this.y = y;
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this.width = width;
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this.height = height;
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}
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/**
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* Constructs a new <code>Rectangle</code> whose upper-left corner
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* is at (0, 0) in the coordinate space, and whose width and
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* height are specified by the arguments of the same name.
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* @param width the width of the <code>Rectangle</code>
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* @param height the height of the <code>Rectangle</code>
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*/
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public Rectangle(int width, int height) {
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this(0, 0, width, height);
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}
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/**
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* Constructs a new <code>Rectangle</code> whose upper-left corner is
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* specified by the {@link Point} argument, and
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* whose width and height are specified by the
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* {@link Dimension} argument.
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* @param p a <code>Point</code> that is the upper-left corner of
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* the <code>Rectangle</code>
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* @param d a <code>Dimension</code>, representing the
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* width and height of the <code>Rectangle</code>
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*/
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public Rectangle(Point p, Dimension d) {
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this(p.x, p.y, d.width, d.height);
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}
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/**
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* Constructs a new <code>Rectangle</code> whose upper-left corner is the
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* specified <code>Point</code>, and whose width and height are both zero.
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* @param p a <code>Point</code> that is the top left corner
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* of the <code>Rectangle</code>
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*/
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public Rectangle(Point p) {
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this(p.x, p.y, 0, 0);
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}
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/**
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* Constructs a new <code>Rectangle</code> whose top left corner is
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* (0, 0) and whose width and height are specified
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* by the <code>Dimension</code> argument.
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* @param d a <code>Dimension</code>, specifying width and height
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*/
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public Rectangle(Dimension d) {
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this(0, 0, d.width, d.height);
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}
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/**
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* Returns the X coordinate of the bounding <code>Rectangle</code> in
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* <code>double</code> precision.
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* @return the X coordinate of the bounding <code>Rectangle</code>.
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*/
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public double getX() {
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return x;
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}
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/**
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* Returns the Y coordinate of the bounding <code>Rectangle</code> in
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* <code>double</code> precision.
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* @return the Y coordinate of the bounding <code>Rectangle</code>.
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*/
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public double getY() {
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return y;
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}
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/**
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* Returns the width of the bounding <code>Rectangle</code> in
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* <code>double</code> precision.
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* @return the width of the bounding <code>Rectangle</code>.
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*/
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public double getWidth() {
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return width;
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}
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/**
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* Returns the height of the bounding <code>Rectangle</code> in
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* <code>double</code> precision.
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* @return the height of the bounding <code>Rectangle</code>.
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*/
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public double getHeight() {
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return height;
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}
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/**
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* Gets the bounding <code>Rectangle</code> of this <code>Rectangle</code>.
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* <p>
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* This method is included for completeness, to parallel the
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* <code>getBounds</code> method of
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* {@link Component}.
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* @return a new <code>Rectangle</code>, equal to the
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* bounding <code>Rectangle</code> for this <code>Rectangle</code>.
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* @see java.awt.Component#getBounds
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* @see #setBounds(Rectangle)
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* @see #setBounds(int, int, int, int)
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* @since 1.1
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*/
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@Transient
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public Rectangle getBounds() {
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return new Rectangle(x, y, width, height);
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}
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/**
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* {@inheritDoc}
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* @since 1.2
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*/
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public Rectangle2D getBounds2D() {
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return new Rectangle(x, y, width, height);
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}
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/**
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* Sets the bounding <code>Rectangle</code> of this <code>Rectangle</code>
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* to match the specified <code>Rectangle</code>.
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* <p>
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* This method is included for completeness, to parallel the
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* <code>setBounds</code> method of <code>Component</code>.
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* @param r the specified <code>Rectangle</code>
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* @see #getBounds
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* @see java.awt.Component#setBounds(java.awt.Rectangle)
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* @since 1.1
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*/
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public void setBounds(Rectangle r) {
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setBounds(r.x, r.y, r.width, r.height);
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}
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/**
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* Sets the bounding <code>Rectangle</code> of this
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* <code>Rectangle</code> to the specified
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* <code>x</code>, <code>y</code>, <code>width</code>,
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* and <code>height</code>.
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* <p>
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* This method is included for completeness, to parallel the
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* <code>setBounds</code> method of <code>Component</code>.
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* @param x the new X coordinate for the upper-left
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* corner of this <code>Rectangle</code>
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* @param y the new Y coordinate for the upper-left
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* corner of this <code>Rectangle</code>
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* @param width the new width for this <code>Rectangle</code>
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* @param height the new height for this <code>Rectangle</code>
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* @see #getBounds
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* @see java.awt.Component#setBounds(int, int, int, int)
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* @since 1.1
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*/
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public void setBounds(int x, int y, int width, int height) {
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reshape(x, y, width, height);
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}
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/**
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* Sets the bounds of this {@code Rectangle} to the integer bounds
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* which encompass the specified {@code x}, {@code y}, {@code width},
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* and {@code height}.
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* If the parameters specify a {@code Rectangle} that exceeds the
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* maximum range of integers, the result will be the best
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* representation of the specified {@code Rectangle} intersected
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* with the maximum integer bounds.
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* @param x the X coordinate of the upper-left corner of
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* the specified rectangle
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* @param y the Y coordinate of the upper-left corner of
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* the specified rectangle
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* @param width the width of the specified rectangle
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* @param height the new height of the specified rectangle
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*/
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public void setRect(double x, double y, double width, double height) {
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int newx, newy, neww, newh;
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if (x > 2.0 * Integer.MAX_VALUE) {
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// Too far in positive X direction to represent...
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// We cannot even reach the left side of the specified
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// rectangle even with both x & width set to MAX_VALUE.
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// The intersection with the "maximal integer rectangle"
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// is non-existant so we should use a width < 0.
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// REMIND: Should we try to determine a more "meaningful"
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// adjusted value for neww than just "-1"?
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newx = Integer.MAX_VALUE;
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neww = -1;
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} else {
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newx = clip(x, false);
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if (width >= 0) width += x-newx;
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neww = clip(width, width >= 0);
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}
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if (y > 2.0 * Integer.MAX_VALUE) {
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// Too far in positive Y direction to represent...
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newy = Integer.MAX_VALUE;
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newh = -1;
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} else {
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newy = clip(y, false);
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if (height >= 0) height += y-newy;
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newh = clip(height, height >= 0);
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}
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reshape(newx, newy, neww, newh);
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}
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// Return best integer representation for v, clipped to integer
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// range and floor-ed or ceiling-ed, depending on the boolean.
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private static int clip(double v, boolean doceil) {
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if (v <= Integer.MIN_VALUE) {
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return Integer.MIN_VALUE;
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}
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if (v >= Integer.MAX_VALUE) {
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return Integer.MAX_VALUE;
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}
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return (int) (doceil ? Math.ceil(v) : Math.floor(v));
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}
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/**
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* Sets the bounding <code>Rectangle</code> of this
|
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* <code>Rectangle</code> to the specified
|
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* <code>x</code>, <code>y</code>, <code>width</code>,
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* and <code>height</code>.
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* <p>
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* @param x the new X coordinate for the upper-left
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* corner of this <code>Rectangle</code>
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* @param y the new Y coordinate for the upper-left
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* corner of this <code>Rectangle</code>
|
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* @param width the new width for this <code>Rectangle</code>
|
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* @param height the new height for this <code>Rectangle</code>
|
|
* @deprecated As of JDK version 1.1,
|
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* replaced by <code>setBounds(int, int, int, int)</code>.
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*/
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@Deprecated
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public void reshape(int x, int y, int width, int height) {
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this.x = x;
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this.y = y;
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this.width = width;
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this.height = height;
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}
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|
|
/**
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* Returns the location of this <code>Rectangle</code>.
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* <p>
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|
* This method is included for completeness, to parallel the
|
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* <code>getLocation</code> method of <code>Component</code>.
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* @return the <code>Point</code> that is the upper-left corner of
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* this <code>Rectangle</code>.
|
|
* @see java.awt.Component#getLocation
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* @see #setLocation(Point)
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* @see #setLocation(int, int)
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* @since 1.1
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|
*/
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public Point getLocation() {
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return new Point(x, y);
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}
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|
|
|
/**
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* Moves this <code>Rectangle</code> to the specified location.
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|
* <p>
|
|
* This method is included for completeness, to parallel the
|
|
* <code>setLocation</code> method of <code>Component</code>.
|
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* @param p the <code>Point</code> specifying the new location
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* for this <code>Rectangle</code>
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* @see java.awt.Component#setLocation(java.awt.Point)
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* @see #getLocation
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* @since 1.1
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*/
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public void setLocation(Point p) {
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setLocation(p.x, p.y);
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}
|
|
|
|
/**
|
|
* Moves this <code>Rectangle</code> to the specified location.
|
|
* <p>
|
|
* This method is included for completeness, to parallel the
|
|
* <code>setLocation</code> method of <code>Component</code>.
|
|
* @param x the X coordinate of the new location
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|
* @param y the Y coordinate of the new location
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|
* @see #getLocation
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* @see java.awt.Component#setLocation(int, int)
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* @since 1.1
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|
*/
|
|
public void setLocation(int x, int y) {
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move(x, y);
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|
}
|
|
|
|
/**
|
|
* Moves this <code>Rectangle</code> to the specified location.
|
|
* <p>
|
|
* @param x the X coordinate of the new location
|
|
* @param y the Y coordinate of the new location
|
|
* @deprecated As of JDK version 1.1,
|
|
* replaced by <code>setLocation(int, int)</code>.
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|
*/
|
|
@Deprecated
|
|
public void move(int x, int y) {
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|
this.x = x;
|
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this.y = y;
|
|
}
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|
|
|
/**
|
|
* Translates this <code>Rectangle</code> the indicated distance,
|
|
* to the right along the X coordinate axis, and
|
|
* downward along the Y coordinate axis.
|
|
* @param dx the distance to move this <code>Rectangle</code>
|
|
* along the X axis
|
|
* @param dy the distance to move this <code>Rectangle</code>
|
|
* along the Y axis
|
|
* @see java.awt.Rectangle#setLocation(int, int)
|
|
* @see java.awt.Rectangle#setLocation(java.awt.Point)
|
|
*/
|
|
public void translate(int dx, int dy) {
|
|
int oldv = this.x;
|
|
int newv = oldv + dx;
|
|
if (dx < 0) {
|
|
// moving leftward
|
|
if (newv > oldv) {
|
|
// negative overflow
|
|
// Only adjust width if it was valid (>= 0).
|
|
if (width >= 0) {
|
|
// The right edge is now conceptually at
|
|
// newv+width, but we may move newv to prevent
|
|
// overflow. But we want the right edge to
|
|
// remain at its new location in spite of the
|
|
// clipping. Think of the following adjustment
|
|
// conceptually the same as:
|
|
// width += newv; newv = MIN_VALUE; width -= newv;
|
|
width += newv - Integer.MIN_VALUE;
|
|
// width may go negative if the right edge went past
|
|
// MIN_VALUE, but it cannot overflow since it cannot
|
|
// have moved more than MIN_VALUE and any non-negative
|
|
// number + MIN_VALUE does not overflow.
|
|
}
|
|
newv = Integer.MIN_VALUE;
|
|
}
|
|
} else {
|
|
// moving rightward (or staying still)
|
|
if (newv < oldv) {
|
|
// positive overflow
|
|
if (width >= 0) {
|
|
// Conceptually the same as:
|
|
// width += newv; newv = MAX_VALUE; width -= newv;
|
|
width += newv - Integer.MAX_VALUE;
|
|
// With large widths and large displacements
|
|
// we may overflow so we need to check it.
|
|
if (width < 0) width = Integer.MAX_VALUE;
|
|
}
|
|
newv = Integer.MAX_VALUE;
|
|
}
|
|
}
|
|
this.x = newv;
|
|
|
|
oldv = this.y;
|
|
newv = oldv + dy;
|
|
if (dy < 0) {
|
|
// moving upward
|
|
if (newv > oldv) {
|
|
// negative overflow
|
|
if (height >= 0) {
|
|
height += newv - Integer.MIN_VALUE;
|
|
// See above comment about no overflow in this case
|
|
}
|
|
newv = Integer.MIN_VALUE;
|
|
}
|
|
} else {
|
|
// moving downward (or staying still)
|
|
if (newv < oldv) {
|
|
// positive overflow
|
|
if (height >= 0) {
|
|
height += newv - Integer.MAX_VALUE;
|
|
if (height < 0) height = Integer.MAX_VALUE;
|
|
}
|
|
newv = Integer.MAX_VALUE;
|
|
}
|
|
}
|
|
this.y = newv;
|
|
}
|
|
|
|
/**
|
|
* Gets the size of this <code>Rectangle</code>, represented by
|
|
* the returned <code>Dimension</code>.
|
|
* <p>
|
|
* This method is included for completeness, to parallel the
|
|
* <code>getSize</code> method of <code>Component</code>.
|
|
* @return a <code>Dimension</code>, representing the size of
|
|
* this <code>Rectangle</code>.
|
|
* @see java.awt.Component#getSize
|
|
* @see #setSize(Dimension)
|
|
* @see #setSize(int, int)
|
|
* @since 1.1
|
|
*/
|
|
public Dimension getSize() {
|
|
return new Dimension(width, height);
|
|
}
|
|
|
|
/**
|
|
* Sets the size of this <code>Rectangle</code> to match the
|
|
* specified <code>Dimension</code>.
|
|
* <p>
|
|
* This method is included for completeness, to parallel the
|
|
* <code>setSize</code> method of <code>Component</code>.
|
|
* @param d the new size for the <code>Dimension</code> object
|
|
* @see java.awt.Component#setSize(java.awt.Dimension)
|
|
* @see #getSize
|
|
* @since 1.1
|
|
*/
|
|
public void setSize(Dimension d) {
|
|
setSize(d.width, d.height);
|
|
}
|
|
|
|
/**
|
|
* Sets the size of this <code>Rectangle</code> to the specified
|
|
* width and height.
|
|
* <p>
|
|
* This method is included for completeness, to parallel the
|
|
* <code>setSize</code> method of <code>Component</code>.
|
|
* @param width the new width for this <code>Rectangle</code>
|
|
* @param height the new height for this <code>Rectangle</code>
|
|
* @see java.awt.Component#setSize(int, int)
|
|
* @see #getSize
|
|
* @since 1.1
|
|
*/
|
|
public void setSize(int width, int height) {
|
|
resize(width, height);
|
|
}
|
|
|
|
/**
|
|
* Sets the size of this <code>Rectangle</code> to the specified
|
|
* width and height.
|
|
* <p>
|
|
* @param width the new width for this <code>Rectangle</code>
|
|
* @param height the new height for this <code>Rectangle</code>
|
|
* @deprecated As of JDK version 1.1,
|
|
* replaced by <code>setSize(int, int)</code>.
|
|
*/
|
|
@Deprecated
|
|
public void resize(int width, int height) {
|
|
this.width = width;
|
|
this.height = height;
|
|
}
|
|
|
|
/**
|
|
* Checks whether or not this <code>Rectangle</code> contains the
|
|
* specified <code>Point</code>.
|
|
* @param p the <code>Point</code> to test
|
|
* @return <code>true</code> if the specified <code>Point</code>
|
|
* is inside this <code>Rectangle</code>;
|
|
* <code>false</code> otherwise.
|
|
* @since 1.1
|
|
*/
|
|
public boolean contains(Point p) {
|
|
return contains(p.x, p.y);
|
|
}
|
|
|
|
/**
|
|
* Checks whether or not this <code>Rectangle</code> contains the
|
|
* point at the specified location {@code (x,y)}.
|
|
*
|
|
* @param x the specified X coordinate
|
|
* @param y the specified Y coordinate
|
|
* @return <code>true</code> if the point
|
|
* {@code (x,y)} is inside this
|
|
* <code>Rectangle</code>;
|
|
* <code>false</code> otherwise.
|
|
* @since 1.1
|
|
*/
|
|
public boolean contains(int x, int y) {
|
|
return inside(x, y);
|
|
}
|
|
|
|
/**
|
|
* Checks whether or not this <code>Rectangle</code> entirely contains
|
|
* the specified <code>Rectangle</code>.
|
|
*
|
|
* @param r the specified <code>Rectangle</code>
|
|
* @return <code>true</code> if the <code>Rectangle</code>
|
|
* is contained entirely inside this <code>Rectangle</code>;
|
|
* <code>false</code> otherwise
|
|
* @since 1.2
|
|
*/
|
|
public boolean contains(Rectangle r) {
|
|
return contains(r.x, r.y, r.width, r.height);
|
|
}
|
|
|
|
/**
|
|
* Checks whether this <code>Rectangle</code> entirely contains
|
|
* the <code>Rectangle</code>
|
|
* at the specified location {@code (X,Y)} with the
|
|
* specified dimensions {@code (W,H)}.
|
|
* @param X the specified X coordinate
|
|
* @param Y the specified Y coordinate
|
|
* @param W the width of the <code>Rectangle</code>
|
|
* @param H the height of the <code>Rectangle</code>
|
|
* @return <code>true</code> if the <code>Rectangle</code> specified by
|
|
* {@code (X, Y, W, H)}
|
|
* is entirely enclosed inside this <code>Rectangle</code>;
|
|
* <code>false</code> otherwise.
|
|
* @since 1.1
|
|
*/
|
|
public boolean contains(int X, int Y, int W, int H) {
|
|
int w = this.width;
|
|
int h = this.height;
|
|
if ((w | h | W | H) < 0) {
|
|
// At least one of the dimensions is negative...
|
|
return false;
|
|
}
|
|
// Note: if any dimension is zero, tests below must return false...
|
|
int x = this.x;
|
|
int y = this.y;
|
|
if (X < x || Y < y) {
|
|
return false;
|
|
}
|
|
w += x;
|
|
W += X;
|
|
if (W <= X) {
|
|
// X+W overflowed or W was zero, return false if...
|
|
// either original w or W was zero or
|
|
// x+w did not overflow or
|
|
// the overflowed x+w is smaller than the overflowed X+W
|
|
if (w >= x || W > w) return false;
|
|
} else {
|
|
// X+W did not overflow and W was not zero, return false if...
|
|
// original w was zero or
|
|
// x+w did not overflow and x+w is smaller than X+W
|
|
if (w >= x && W > w) return false;
|
|
}
|
|
h += y;
|
|
H += Y;
|
|
if (H <= Y) {
|
|
if (h >= y || H > h) return false;
|
|
} else {
|
|
if (h >= y && H > h) return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Checks whether or not this <code>Rectangle</code> contains the
|
|
* point at the specified location {@code (X,Y)}.
|
|
*
|
|
* @param X the specified X coordinate
|
|
* @param Y the specified Y coordinate
|
|
* @return <code>true</code> if the point
|
|
* {@code (X,Y)} is inside this
|
|
* <code>Rectangle</code>;
|
|
* <code>false</code> otherwise.
|
|
* @deprecated As of JDK version 1.1,
|
|
* replaced by <code>contains(int, int)</code>.
|
|
*/
|
|
@Deprecated
|
|
public boolean inside(int X, int Y) {
|
|
int w = this.width;
|
|
int h = this.height;
|
|
if ((w | h) < 0) {
|
|
// At least one of the dimensions is negative...
|
|
return false;
|
|
}
|
|
// Note: if either dimension is zero, tests below must return false...
|
|
int x = this.x;
|
|
int y = this.y;
|
|
if (X < x || Y < y) {
|
|
return false;
|
|
}
|
|
w += x;
|
|
h += y;
|
|
// overflow || intersect
|
|
return ((w < x || w > X) &&
|
|
(h < y || h > Y));
|
|
}
|
|
|
|
/**
|
|
* Determines whether or not this <code>Rectangle</code> and the specified
|
|
* <code>Rectangle</code> intersect. Two rectangles intersect if
|
|
* their intersection is nonempty.
|
|
*
|
|
* @param r the specified <code>Rectangle</code>
|
|
* @return <code>true</code> if the specified <code>Rectangle</code>
|
|
* and this <code>Rectangle</code> intersect;
|
|
* <code>false</code> otherwise.
|
|
*/
|
|
public boolean intersects(Rectangle r) {
|
|
int tw = this.width;
|
|
int th = this.height;
|
|
int rw = r.width;
|
|
int rh = r.height;
|
|
if (rw <= 0 || rh <= 0 || tw <= 0 || th <= 0) {
|
|
return false;
|
|
}
|
|
int tx = this.x;
|
|
int ty = this.y;
|
|
int rx = r.x;
|
|
int ry = r.y;
|
|
rw += rx;
|
|
rh += ry;
|
|
tw += tx;
|
|
th += ty;
|
|
// overflow || intersect
|
|
return ((rw < rx || rw > tx) &&
|
|
(rh < ry || rh > ty) &&
|
|
(tw < tx || tw > rx) &&
|
|
(th < ty || th > ry));
|
|
}
|
|
|
|
/**
|
|
* Computes the intersection of this <code>Rectangle</code> with the
|
|
* specified <code>Rectangle</code>. Returns a new <code>Rectangle</code>
|
|
* that represents the intersection of the two rectangles.
|
|
* If the two rectangles do not intersect, the result will be
|
|
* an empty rectangle.
|
|
*
|
|
* @param r the specified <code>Rectangle</code>
|
|
* @return the largest <code>Rectangle</code> contained in both the
|
|
* specified <code>Rectangle</code> and in
|
|
* this <code>Rectangle</code>; or if the rectangles
|
|
* do not intersect, an empty rectangle.
|
|
*/
|
|
public Rectangle intersection(Rectangle r) {
|
|
int tx1 = this.x;
|
|
int ty1 = this.y;
|
|
int rx1 = r.x;
|
|
int ry1 = r.y;
|
|
long tx2 = tx1; tx2 += this.width;
|
|
long ty2 = ty1; ty2 += this.height;
|
|
long rx2 = rx1; rx2 += r.width;
|
|
long ry2 = ry1; ry2 += r.height;
|
|
if (tx1 < rx1) tx1 = rx1;
|
|
if (ty1 < ry1) ty1 = ry1;
|
|
if (tx2 > rx2) tx2 = rx2;
|
|
if (ty2 > ry2) ty2 = ry2;
|
|
tx2 -= tx1;
|
|
ty2 -= ty1;
|
|
// tx2,ty2 will never overflow (they will never be
|
|
// larger than the smallest of the two source w,h)
|
|
// they might underflow, though...
|
|
if (tx2 < Integer.MIN_VALUE) tx2 = Integer.MIN_VALUE;
|
|
if (ty2 < Integer.MIN_VALUE) ty2 = Integer.MIN_VALUE;
|
|
return new Rectangle(tx1, ty1, (int) tx2, (int) ty2);
|
|
}
|
|
|
|
/**
|
|
* Computes the union of this <code>Rectangle</code> with the
|
|
* specified <code>Rectangle</code>. Returns a new
|
|
* <code>Rectangle</code> that
|
|
* represents the union of the two rectangles.
|
|
* <p>
|
|
* If either {@code Rectangle} has any dimension less than zero
|
|
* the rules for <a href=#NonExistant>non-existant</a> rectangles
|
|
* apply.
|
|
* If only one has a dimension less than zero, then the result
|
|
* will be a copy of the other {@code Rectangle}.
|
|
* If both have dimension less than zero, then the result will
|
|
* have at least one dimension less than zero.
|
|
* <p>
|
|
* If the resulting {@code Rectangle} would have a dimension
|
|
* too large to be expressed as an {@code int}, the result
|
|
* will have a dimension of {@code Integer.MAX_VALUE} along
|
|
* that dimension.
|
|
* @param r the specified <code>Rectangle</code>
|
|
* @return the smallest <code>Rectangle</code> containing both
|
|
* the specified <code>Rectangle</code> and this
|
|
* <code>Rectangle</code>.
|
|
*/
|
|
public Rectangle union(Rectangle r) {
|
|
long tx2 = this.width;
|
|
long ty2 = this.height;
|
|
if ((tx2 | ty2) < 0) {
|
|
// This rectangle has negative dimensions...
|
|
// If r has non-negative dimensions then it is the answer.
|
|
// If r is non-existant (has a negative dimension), then both
|
|
// are non-existant and we can return any non-existant rectangle
|
|
// as an answer. Thus, returning r meets that criterion.
|
|
// Either way, r is our answer.
|
|
return new Rectangle(r);
|
|
}
|
|
long rx2 = r.width;
|
|
long ry2 = r.height;
|
|
if ((rx2 | ry2) < 0) {
|
|
return new Rectangle(this);
|
|
}
|
|
int tx1 = this.x;
|
|
int ty1 = this.y;
|
|
tx2 += tx1;
|
|
ty2 += ty1;
|
|
int rx1 = r.x;
|
|
int ry1 = r.y;
|
|
rx2 += rx1;
|
|
ry2 += ry1;
|
|
if (tx1 > rx1) tx1 = rx1;
|
|
if (ty1 > ry1) ty1 = ry1;
|
|
if (tx2 < rx2) tx2 = rx2;
|
|
if (ty2 < ry2) ty2 = ry2;
|
|
tx2 -= tx1;
|
|
ty2 -= ty1;
|
|
// tx2,ty2 will never underflow since both original rectangles
|
|
// were already proven to be non-empty
|
|
// they might overflow, though...
|
|
if (tx2 > Integer.MAX_VALUE) tx2 = Integer.MAX_VALUE;
|
|
if (ty2 > Integer.MAX_VALUE) ty2 = Integer.MAX_VALUE;
|
|
return new Rectangle(tx1, ty1, (int) tx2, (int) ty2);
|
|
}
|
|
|
|
/**
|
|
* Adds a point, specified by the integer arguments {@code newx,newy}
|
|
* to the bounds of this {@code Rectangle}.
|
|
* <p>
|
|
* If this {@code Rectangle} has any dimension less than zero,
|
|
* the rules for <a href=#NonExistant>non-existant</a>
|
|
* rectangles apply.
|
|
* In that case, the new bounds of this {@code Rectangle} will
|
|
* have a location equal to the specified coordinates and
|
|
* width and height equal to zero.
|
|
* <p>
|
|
* After adding a point, a call to <code>contains</code> with the
|
|
* added point as an argument does not necessarily return
|
|
* <code>true</code>. The <code>contains</code> method does not
|
|
* return <code>true</code> for points on the right or bottom
|
|
* edges of a <code>Rectangle</code>. Therefore, if the added point
|
|
* falls on the right or bottom edge of the enlarged
|
|
* <code>Rectangle</code>, <code>contains</code> returns
|
|
* <code>false</code> for that point.
|
|
* If the specified point must be contained within the new
|
|
* {@code Rectangle}, a 1x1 rectangle should be added instead:
|
|
* <pre>
|
|
* r.add(newx, newy, 1, 1);
|
|
* </pre>
|
|
* @param newx the X coordinate of the new point
|
|
* @param newy the Y coordinate of the new point
|
|
*/
|
|
public void add(int newx, int newy) {
|
|
if ((width | height) < 0) {
|
|
this.x = newx;
|
|
this.y = newy;
|
|
this.width = this.height = 0;
|
|
return;
|
|
}
|
|
int x1 = this.x;
|
|
int y1 = this.y;
|
|
long x2 = this.width;
|
|
long y2 = this.height;
|
|
x2 += x1;
|
|
y2 += y1;
|
|
if (x1 > newx) x1 = newx;
|
|
if (y1 > newy) y1 = newy;
|
|
if (x2 < newx) x2 = newx;
|
|
if (y2 < newy) y2 = newy;
|
|
x2 -= x1;
|
|
y2 -= y1;
|
|
if (x2 > Integer.MAX_VALUE) x2 = Integer.MAX_VALUE;
|
|
if (y2 > Integer.MAX_VALUE) y2 = Integer.MAX_VALUE;
|
|
reshape(x1, y1, (int) x2, (int) y2);
|
|
}
|
|
|
|
/**
|
|
* Adds the specified {@code Point} to the bounds of this
|
|
* {@code Rectangle}.
|
|
* <p>
|
|
* If this {@code Rectangle} has any dimension less than zero,
|
|
* the rules for <a href=#NonExistant>non-existant</a>
|
|
* rectangles apply.
|
|
* In that case, the new bounds of this {@code Rectangle} will
|
|
* have a location equal to the coordinates of the specified
|
|
* {@code Point} and width and height equal to zero.
|
|
* <p>
|
|
* After adding a <code>Point</code>, a call to <code>contains</code>
|
|
* with the added <code>Point</code> as an argument does not
|
|
* necessarily return <code>true</code>. The <code>contains</code>
|
|
* method does not return <code>true</code> for points on the right
|
|
* or bottom edges of a <code>Rectangle</code>. Therefore if the added
|
|
* <code>Point</code> falls on the right or bottom edge of the
|
|
* enlarged <code>Rectangle</code>, <code>contains</code> returns
|
|
* <code>false</code> for that <code>Point</code>.
|
|
* If the specified point must be contained within the new
|
|
* {@code Rectangle}, a 1x1 rectangle should be added instead:
|
|
* <pre>
|
|
* r.add(pt.x, pt.y, 1, 1);
|
|
* </pre>
|
|
* @param pt the new <code>Point</code> to add to this
|
|
* <code>Rectangle</code>
|
|
*/
|
|
public void add(Point pt) {
|
|
add(pt.x, pt.y);
|
|
}
|
|
|
|
/**
|
|
* Adds a <code>Rectangle</code> to this <code>Rectangle</code>.
|
|
* The resulting <code>Rectangle</code> is the union of the two
|
|
* rectangles.
|
|
* <p>
|
|
* If either {@code Rectangle} has any dimension less than 0, the
|
|
* result will have the dimensions of the other {@code Rectangle}.
|
|
* If both {@code Rectangle}s have at least one dimension less
|
|
* than 0, the result will have at least one dimension less than 0.
|
|
* <p>
|
|
* If either {@code Rectangle} has one or both dimensions equal
|
|
* to 0, the result along those axes with 0 dimensions will be
|
|
* equivalent to the results obtained by adding the corresponding
|
|
* origin coordinate to the result rectangle along that axis,
|
|
* similar to the operation of the {@link #add(Point)} method,
|
|
* but contribute no further dimension beyond that.
|
|
* <p>
|
|
* If the resulting {@code Rectangle} would have a dimension
|
|
* too large to be expressed as an {@code int}, the result
|
|
* will have a dimension of {@code Integer.MAX_VALUE} along
|
|
* that dimension.
|
|
* @param r the specified <code>Rectangle</code>
|
|
*/
|
|
public void add(Rectangle r) {
|
|
long tx2 = this.width;
|
|
long ty2 = this.height;
|
|
if ((tx2 | ty2) < 0) {
|
|
reshape(r.x, r.y, r.width, r.height);
|
|
}
|
|
long rx2 = r.width;
|
|
long ry2 = r.height;
|
|
if ((rx2 | ry2) < 0) {
|
|
return;
|
|
}
|
|
int tx1 = this.x;
|
|
int ty1 = this.y;
|
|
tx2 += tx1;
|
|
ty2 += ty1;
|
|
int rx1 = r.x;
|
|
int ry1 = r.y;
|
|
rx2 += rx1;
|
|
ry2 += ry1;
|
|
if (tx1 > rx1) tx1 = rx1;
|
|
if (ty1 > ry1) ty1 = ry1;
|
|
if (tx2 < rx2) tx2 = rx2;
|
|
if (ty2 < ry2) ty2 = ry2;
|
|
tx2 -= tx1;
|
|
ty2 -= ty1;
|
|
// tx2,ty2 will never underflow since both original
|
|
// rectangles were non-empty
|
|
// they might overflow, though...
|
|
if (tx2 > Integer.MAX_VALUE) tx2 = Integer.MAX_VALUE;
|
|
if (ty2 > Integer.MAX_VALUE) ty2 = Integer.MAX_VALUE;
|
|
reshape(tx1, ty1, (int) tx2, (int) ty2);
|
|
}
|
|
|
|
/**
|
|
* Resizes the <code>Rectangle</code> both horizontally and vertically.
|
|
* <p>
|
|
* This method modifies the <code>Rectangle</code> so that it is
|
|
* <code>h</code> units larger on both the left and right side,
|
|
* and <code>v</code> units larger at both the top and bottom.
|
|
* <p>
|
|
* The new <code>Rectangle</code> has {@code (x - h, y - v)}
|
|
* as its upper-left corner,
|
|
* width of {@code (width + 2h)},
|
|
* and a height of {@code (height + 2v)}.
|
|
* <p>
|
|
* If negative values are supplied for <code>h</code> and
|
|
* <code>v</code>, the size of the <code>Rectangle</code>
|
|
* decreases accordingly.
|
|
* The {@code grow} method will check for integer overflow
|
|
* and underflow, but does not check whether the resulting
|
|
* values of {@code width} and {@code height} grow
|
|
* from negative to non-negative or shrink from non-negative
|
|
* to negative.
|
|
* @param h the horizontal expansion
|
|
* @param v the vertical expansion
|
|
*/
|
|
public void grow(int h, int v) {
|
|
long x0 = this.x;
|
|
long y0 = this.y;
|
|
long x1 = this.width;
|
|
long y1 = this.height;
|
|
x1 += x0;
|
|
y1 += y0;
|
|
|
|
x0 -= h;
|
|
y0 -= v;
|
|
x1 += h;
|
|
y1 += v;
|
|
|
|
if (x1 < x0) {
|
|
// Non-existant in X direction
|
|
// Final width must remain negative so subtract x0 before
|
|
// it is clipped so that we avoid the risk that the clipping
|
|
// of x0 will reverse the ordering of x0 and x1.
|
|
x1 -= x0;
|
|
if (x1 < Integer.MIN_VALUE) x1 = Integer.MIN_VALUE;
|
|
if (x0 < Integer.MIN_VALUE) x0 = Integer.MIN_VALUE;
|
|
else if (x0 > Integer.MAX_VALUE) x0 = Integer.MAX_VALUE;
|
|
} else { // (x1 >= x0)
|
|
// Clip x0 before we subtract it from x1 in case the clipping
|
|
// affects the representable area of the rectangle.
|
|
if (x0 < Integer.MIN_VALUE) x0 = Integer.MIN_VALUE;
|
|
else if (x0 > Integer.MAX_VALUE) x0 = Integer.MAX_VALUE;
|
|
x1 -= x0;
|
|
// The only way x1 can be negative now is if we clipped
|
|
// x0 against MIN and x1 is less than MIN - in which case
|
|
// we want to leave the width negative since the result
|
|
// did not intersect the representable area.
|
|
if (x1 < Integer.MIN_VALUE) x1 = Integer.MIN_VALUE;
|
|
else if (x1 > Integer.MAX_VALUE) x1 = Integer.MAX_VALUE;
|
|
}
|
|
|
|
if (y1 < y0) {
|
|
// Non-existant in Y direction
|
|
y1 -= y0;
|
|
if (y1 < Integer.MIN_VALUE) y1 = Integer.MIN_VALUE;
|
|
if (y0 < Integer.MIN_VALUE) y0 = Integer.MIN_VALUE;
|
|
else if (y0 > Integer.MAX_VALUE) y0 = Integer.MAX_VALUE;
|
|
} else { // (y1 >= y0)
|
|
if (y0 < Integer.MIN_VALUE) y0 = Integer.MIN_VALUE;
|
|
else if (y0 > Integer.MAX_VALUE) y0 = Integer.MAX_VALUE;
|
|
y1 -= y0;
|
|
if (y1 < Integer.MIN_VALUE) y1 = Integer.MIN_VALUE;
|
|
else if (y1 > Integer.MAX_VALUE) y1 = Integer.MAX_VALUE;
|
|
}
|
|
|
|
reshape((int) x0, (int) y0, (int) x1, (int) y1);
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
* @since 1.2
|
|
*/
|
|
public boolean isEmpty() {
|
|
return (width <= 0) || (height <= 0);
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
* @since 1.2
|
|
*/
|
|
public int outcode(double x, double y) {
|
|
/*
|
|
* Note on casts to double below. If the arithmetic of
|
|
* x+w or y+h is done in int, then we may get integer
|
|
* overflow. By converting to double before the addition
|
|
* we force the addition to be carried out in double to
|
|
* avoid overflow in the comparison.
|
|
*
|
|
* See bug 4320890 for problems that this can cause.
|
|
*/
|
|
int out = 0;
|
|
if (this.width <= 0) {
|
|
out |= OUT_LEFT | OUT_RIGHT;
|
|
} else if (x < this.x) {
|
|
out |= OUT_LEFT;
|
|
} else if (x > this.x + (double) this.width) {
|
|
out |= OUT_RIGHT;
|
|
}
|
|
if (this.height <= 0) {
|
|
out |= OUT_TOP | OUT_BOTTOM;
|
|
} else if (y < this.y) {
|
|
out |= OUT_TOP;
|
|
} else if (y > this.y + (double) this.height) {
|
|
out |= OUT_BOTTOM;
|
|
}
|
|
return out;
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
* @since 1.2
|
|
*/
|
|
public Rectangle2D createIntersection(Rectangle2D r) {
|
|
if (r instanceof Rectangle) {
|
|
return intersection((Rectangle) r);
|
|
}
|
|
Rectangle2D dest = new Rectangle2D.Double();
|
|
Rectangle2D.intersect(this, r, dest);
|
|
return dest;
|
|
}
|
|
|
|
/**
|
|
* {@inheritDoc}
|
|
* @since 1.2
|
|
*/
|
|
public Rectangle2D createUnion(Rectangle2D r) {
|
|
if (r instanceof Rectangle) {
|
|
return union((Rectangle) r);
|
|
}
|
|
Rectangle2D dest = new Rectangle2D.Double();
|
|
Rectangle2D.union(this, r, dest);
|
|
return dest;
|
|
}
|
|
|
|
/**
|
|
* Checks whether two rectangles are equal.
|
|
* <p>
|
|
* The result is <code>true</code> if and only if the argument is not
|
|
* <code>null</code> and is a <code>Rectangle</code> object that has the
|
|
* same upper-left corner, width, and height as
|
|
* this <code>Rectangle</code>.
|
|
* @param obj the <code>Object</code> to compare with
|
|
* this <code>Rectangle</code>
|
|
* @return <code>true</code> if the objects are equal;
|
|
* <code>false</code> otherwise.
|
|
*/
|
|
public boolean equals(Object obj) {
|
|
if (obj instanceof Rectangle) {
|
|
Rectangle r = (Rectangle)obj;
|
|
return ((x == r.x) &&
|
|
(y == r.y) &&
|
|
(width == r.width) &&
|
|
(height == r.height));
|
|
}
|
|
return super.equals(obj);
|
|
}
|
|
|
|
/**
|
|
* Returns a <code>String</code> representing this
|
|
* <code>Rectangle</code> and its values.
|
|
* @return a <code>String</code> representing this
|
|
* <code>Rectangle</code> object's coordinate and size values.
|
|
*/
|
|
public String toString() {
|
|
return getClass().getName() + "[x=" + x + ",y=" + y + ",width=" + width + ",height=" + height + "]";
|
|
}
|
|
}
|