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643 lines
26 KiB
643 lines
26 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.Graphics2D;
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import java.awt.font.FontRenderContext;
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import java.awt.font.LineMetrics;
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import java.awt.geom.Rectangle2D;
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import java.text.CharacterIterator;
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/**
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* The <code>FontMetrics</code> class defines a font metrics object, which
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* encapsulates information about the rendering of a particular font on a
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* particular screen.
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* <p>
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* <b>Note to subclassers</b>: Since many of these methods form closed,
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* mutually recursive loops, you must take care that you implement
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* at least one of the methods in each such loop to prevent
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* infinite recursion when your subclass is used.
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* In particular, the following is the minimal suggested set of methods
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* to override in order to ensure correctness and prevent infinite
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* recursion (though other subsets are equally feasible):
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* <ul>
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* <li>{@link #getAscent()}
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* <li>{@link #getLeading()}
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* <li>{@link #getMaxAdvance()}
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* <li>{@link #charWidth(char)}
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* <li>{@link #charsWidth(char[], int, int)}
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* </ul>
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* <p>
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* <img src="doc-files/FontMetrics-1.gif" alt="The letter 'p' showing its 'reference point'"
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* style="border:15px; float:right; margin: 7px 10px;">
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* Note that the implementations of these methods are
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* inefficient, so they are usually overridden with more efficient
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* toolkit-specific implementations.
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* <p>
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* When an application asks to place a character at the position
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* (<i>x</i>, <i>y</i>), the character is placed so that its
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* reference point (shown as the dot in the accompanying image) is
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* put at that position. The reference point specifies a horizontal
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* line called the <i>baseline</i> of the character. In normal
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* printing, the baselines of characters should align.
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* <p>
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* In addition, every character in a font has an <i>ascent</i>, a
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* <i>descent</i>, and an <i>advance width</i>. The ascent is the
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* amount by which the character ascends above the baseline. The
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* descent is the amount by which the character descends below the
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* baseline. The advance width indicates the position at which AWT
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* should place the next character.
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* <p>
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* An array of characters or a string can also have an ascent, a
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* descent, and an advance width. The ascent of the array is the
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* maximum ascent of any character in the array. The descent is the
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* maximum descent of any character in the array. The advance width
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* is the sum of the advance widths of each of the characters in the
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* character array. The advance of a <code>String</code> is the
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* distance along the baseline of the <code>String</code>. This
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* distance is the width that should be used for centering or
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* right-aligning the <code>String</code>.
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* <p>Note that the advance of a <code>String</code> is not necessarily
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* the sum of the advances of its characters measured in isolation
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* because the width of a character can vary depending on its context.
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* For example, in Arabic text, the shape of a character can change
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* in order to connect to other characters. Also, in some scripts,
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* certain character sequences can be represented by a single shape,
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* called a <em>ligature</em>. Measuring characters individually does
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* not account for these transformations.
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* <p>Font metrics are baseline-relative, meaning that they are
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* generally independent of the rotation applied to the font (modulo
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* possible grid hinting effects). See {@link java.awt.Font Font}.
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*
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* @author Jim Graham
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* @see java.awt.Font
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* @since JDK1.0
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*/
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public abstract class FontMetrics implements java.io.Serializable {
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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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private static final FontRenderContext
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DEFAULT_FRC = new FontRenderContext(null, false, false);
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/**
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* The actual {@link Font} from which the font metrics are
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* created.
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* This cannot be null.
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*
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* @serial
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* @see #getFont()
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*/
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protected Font font;
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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 = 1681126225205050147L;
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/**
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* Creates a new <code>FontMetrics</code> object for finding out
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* height and width information about the specified <code>Font</code>
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* and specific character glyphs in that <code>Font</code>.
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* @param font the <code>Font</code>
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* @see java.awt.Font
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*/
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protected FontMetrics(Font font) {
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this.font = font;
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}
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/**
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* Gets the <code>Font</code> described by this
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* <code>FontMetrics</code> object.
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* @return the <code>Font</code> described by this
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* <code>FontMetrics</code> object.
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*/
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public Font getFont() {
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return font;
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}
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/**
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* Gets the <code>FontRenderContext</code> used by this
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* <code>FontMetrics</code> object to measure text.
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* <p>
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* Note that methods in this class which take a <code>Graphics</code>
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* parameter measure text using the <code>FontRenderContext</code>
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* of that <code>Graphics</code> object, and not this
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* <code>FontRenderContext</code>
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* @return the <code>FontRenderContext</code> used by this
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* <code>FontMetrics</code> object.
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* @since 1.6
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*/
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public FontRenderContext getFontRenderContext() {
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return DEFAULT_FRC;
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}
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/**
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* Determines the <em>standard leading</em> of the
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* <code>Font</code> described by this <code>FontMetrics</code>
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* object. The standard leading, or
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* interline spacing, is the logical amount of space to be reserved
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* between the descent of one line of text and the ascent of the next
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* line. The height metric is calculated to include this extra space.
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* @return the standard leading of the <code>Font</code>.
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* @see #getHeight()
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* @see #getAscent()
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* @see #getDescent()
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*/
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public int getLeading() {
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return 0;
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}
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/**
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* Determines the <em>font ascent</em> of the <code>Font</code>
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* described by this <code>FontMetrics</code> object. The font ascent
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* is the distance from the font's baseline to the top of most
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* alphanumeric characters. Some characters in the <code>Font</code>
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* might extend above the font ascent line.
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* @return the font ascent of the <code>Font</code>.
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* @see #getMaxAscent()
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*/
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public int getAscent() {
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return font.getSize();
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}
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/**
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* Determines the <em>font descent</em> of the <code>Font</code>
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* described by this
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* <code>FontMetrics</code> object. The font descent is the distance
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* from the font's baseline to the bottom of most alphanumeric
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* characters with descenders. Some characters in the
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* <code>Font</code> might extend
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* below the font descent line.
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* @return the font descent of the <code>Font</code>.
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* @see #getMaxDescent()
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*/
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public int getDescent() {
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return 0;
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}
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/**
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* Gets the standard height of a line of text in this font. This
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* is the distance between the baseline of adjacent lines of text.
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* It is the sum of the leading + ascent + descent. Due to rounding
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* this may not be the same as getAscent() + getDescent() + getLeading().
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* There is no guarantee that lines of text spaced at this distance are
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* disjoint; such lines may overlap if some characters overshoot
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* either the standard ascent or the standard descent metric.
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* @return the standard height of the font.
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* @see #getLeading()
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* @see #getAscent()
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* @see #getDescent()
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*/
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public int getHeight() {
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return getLeading() + getAscent() + getDescent();
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}
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/**
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* Determines the maximum ascent of the <code>Font</code>
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* described by this <code>FontMetrics</code> object. No character
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* extends further above the font's baseline than this height.
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* @return the maximum ascent of any character in the
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* <code>Font</code>.
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* @see #getAscent()
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*/
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public int getMaxAscent() {
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return getAscent();
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}
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/**
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* Determines the maximum descent of the <code>Font</code>
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* described by this <code>FontMetrics</code> object. No character
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* extends further below the font's baseline than this height.
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* @return the maximum descent of any character in the
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* <code>Font</code>.
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* @see #getDescent()
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*/
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public int getMaxDescent() {
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return getDescent();
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}
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/**
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* For backward compatibility only.
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* @return the maximum descent of any character in the
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* <code>Font</code>.
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* @see #getMaxDescent()
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* @deprecated As of JDK version 1.1.1,
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* replaced by <code>getMaxDescent()</code>.
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*/
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@Deprecated
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public int getMaxDecent() {
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return getMaxDescent();
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}
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/**
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* Gets the maximum advance width of any character in this
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* <code>Font</code>. The advance is the
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* distance from the leftmost point to the rightmost point on the
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* string's baseline. The advance of a <code>String</code> is
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* not necessarily the sum of the advances of its characters.
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* @return the maximum advance width of any character
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* in the <code>Font</code>, or <code>-1</code> if the
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* maximum advance width is not known.
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*/
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public int getMaxAdvance() {
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return -1;
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}
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/**
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* Returns the advance width of the specified character in this
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* <code>Font</code>. The advance is the
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* distance from the leftmost point to the rightmost point on the
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* character's baseline. Note that the advance of a
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* <code>String</code> is not necessarily the sum of the advances
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* of its characters.
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*
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* <p>This method doesn't validate the specified character to be a
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* valid Unicode code point. The caller must validate the
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* character value using {@link
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* java.lang.Character#isValidCodePoint(int)
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* Character.isValidCodePoint} if necessary.
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*
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* @param codePoint the character (Unicode code point) to be measured
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* @return the advance width of the specified character
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* in the <code>Font</code> described by this
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* <code>FontMetrics</code> object.
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* @see #charsWidth(char[], int, int)
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* @see #stringWidth(String)
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*/
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public int charWidth(int codePoint) {
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if (!Character.isValidCodePoint(codePoint)) {
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codePoint = 0xffff; // substitute missing glyph width
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}
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if (codePoint < 256) {
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return getWidths()[codePoint];
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} else {
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char[] buffer = new char[2];
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int len = Character.toChars(codePoint, buffer, 0);
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return charsWidth(buffer, 0, len);
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}
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}
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/**
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* Returns the advance width of the specified character in this
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* <code>Font</code>. The advance is the
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* distance from the leftmost point to the rightmost point on the
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* character's baseline. Note that the advance of a
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* <code>String</code> is not necessarily the sum of the advances
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* of its characters.
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*
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* <p><b>Note:</b> This method cannot handle <a
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* href="../lang/Character.html#supplementary"> supplementary
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* characters</a>. To support all Unicode characters, including
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* supplementary characters, use the {@link #charWidth(int)} method.
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*
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* @param ch the character to be measured
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* @return the advance width of the specified character
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* in the <code>Font</code> described by this
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* <code>FontMetrics</code> object.
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* @see #charsWidth(char[], int, int)
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* @see #stringWidth(String)
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*/
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public int charWidth(char ch) {
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if (ch < 256) {
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return getWidths()[ch];
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}
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char data[] = {ch};
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return charsWidth(data, 0, 1);
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}
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/**
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* Returns the total advance width for showing the specified
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* <code>String</code> in this <code>Font</code>. The advance
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* is the distance from the leftmost point to the rightmost point
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* on the string's baseline.
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* <p>
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* Note that the advance of a <code>String</code> is
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* not necessarily the sum of the advances of its characters.
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* @param str the <code>String</code> to be measured
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* @return the advance width of the specified <code>String</code>
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* in the <code>Font</code> described by this
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* <code>FontMetrics</code>.
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* @throws NullPointerException if str is null.
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* @see #bytesWidth(byte[], int, int)
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* @see #charsWidth(char[], int, int)
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* @see #getStringBounds(String, Graphics)
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*/
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public int stringWidth(String str) {
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int len = str.length();
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char data[] = new char[len];
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str.getChars(0, len, data, 0);
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return charsWidth(data, 0, len);
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}
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/**
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* Returns the total advance width for showing the specified array
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* of characters in this <code>Font</code>. The advance is the
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* distance from the leftmost point to the rightmost point on the
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* string's baseline. The advance of a <code>String</code>
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* is not necessarily the sum of the advances of its characters.
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* This is equivalent to measuring a <code>String</code> of the
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* characters in the specified range.
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* @param data the array of characters to be measured
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* @param off the start offset of the characters in the array
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* @param len the number of characters to be measured from the array
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* @return the advance width of the subarray of the specified
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* <code>char</code> array in the font described by
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* this <code>FontMetrics</code> object.
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* @throws NullPointerException if <code>data</code> is null.
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* @throws IndexOutOfBoundsException if the <code>off</code>
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* and <code>len</code> arguments index characters outside
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* the bounds of the <code>data</code> array.
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* @see #charWidth(int)
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* @see #charWidth(char)
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* @see #bytesWidth(byte[], int, int)
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* @see #stringWidth(String)
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*/
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public int charsWidth(char data[], int off, int len) {
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return stringWidth(new String(data, off, len));
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}
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/**
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* Returns the total advance width for showing the specified array
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* of bytes in this <code>Font</code>. The advance is the
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* distance from the leftmost point to the rightmost point on the
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* string's baseline. The advance of a <code>String</code>
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* is not necessarily the sum of the advances of its characters.
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* This is equivalent to measuring a <code>String</code> of the
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* characters in the specified range.
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* @param data the array of bytes to be measured
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* @param off the start offset of the bytes in the array
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* @param len the number of bytes to be measured from the array
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* @return the advance width of the subarray of the specified
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* <code>byte</code> array in the <code>Font</code>
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* described by
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* this <code>FontMetrics</code> object.
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* @throws NullPointerException if <code>data</code> is null.
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* @throws IndexOutOfBoundsException if the <code>off</code>
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* and <code>len</code> arguments index bytes outside
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* the bounds of the <code>data</code> array.
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* @see #charsWidth(char[], int, int)
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* @see #stringWidth(String)
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*/
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public int bytesWidth(byte data[], int off, int len) {
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return stringWidth(new String(data, 0, off, len));
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}
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/**
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* Gets the advance widths of the first 256 characters in the
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* <code>Font</code>. The advance is the
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* distance from the leftmost point to the rightmost point on the
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* character's baseline. Note that the advance of a
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* <code>String</code> is not necessarily the sum of the advances
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* of its characters.
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* @return an array storing the advance widths of the
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* characters in the <code>Font</code>
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* described by this <code>FontMetrics</code> object.
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*/
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public int[] getWidths() {
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int widths[] = new int[256];
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for (char ch = 0 ; ch < 256 ; ch++) {
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widths[ch] = charWidth(ch);
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}
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return widths;
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}
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/**
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* Checks to see if the <code>Font</code> has uniform line metrics. A
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* composite font may consist of several different fonts to cover
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* various character sets. In such cases, the
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* <code>FontLineMetrics</code> objects are not uniform.
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* Different fonts may have a different ascent, descent, metrics and
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* so on. This information is sometimes necessary for line
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* measuring and line breaking.
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* @return <code>true</code> if the font has uniform line metrics;
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* <code>false</code> otherwise.
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* @see java.awt.Font#hasUniformLineMetrics()
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*/
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public boolean hasUniformLineMetrics() {
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return font.hasUniformLineMetrics();
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}
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/**
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* Returns the {@link LineMetrics} object for the specified
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* <code>String</code> in the specified {@link Graphics} context.
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* @param str the specified <code>String</code>
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* @param context the specified <code>Graphics</code> context
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* @return a <code>LineMetrics</code> object created with the
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* specified <code>String</code> and <code>Graphics</code> context.
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* @see java.awt.Font#getLineMetrics(String, FontRenderContext)
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*/
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public LineMetrics getLineMetrics( String str, Graphics context) {
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return font.getLineMetrics(str, myFRC(context));
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}
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/**
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* Returns the {@link LineMetrics} object for the specified
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* <code>String</code> in the specified {@link Graphics} context.
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* @param str the specified <code>String</code>
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* @param beginIndex the initial offset of <code>str</code>
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* @param limit the end offset of <code>str</code>
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* @param context the specified <code>Graphics</code> context
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* @return a <code>LineMetrics</code> object created with the
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* specified <code>String</code> and <code>Graphics</code> context.
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* @see java.awt.Font#getLineMetrics(String, int, int, FontRenderContext)
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*/
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public LineMetrics getLineMetrics( String str,
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int beginIndex, int limit,
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Graphics context) {
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return font.getLineMetrics(str, beginIndex, limit, myFRC(context));
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}
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/**
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* Returns the {@link LineMetrics} object for the specified
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* character array in the specified {@link Graphics} context.
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* @param chars the specified character array
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* @param beginIndex the initial offset of <code>chars</code>
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* @param limit the end offset of <code>chars</code>
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|
* @param context the specified <code>Graphics</code> context
|
|
* @return a <code>LineMetrics</code> object created with the
|
|
* specified character array and <code>Graphics</code> context.
|
|
* @see java.awt.Font#getLineMetrics(char[], int, int, FontRenderContext)
|
|
*/
|
|
public LineMetrics getLineMetrics(char [] chars,
|
|
int beginIndex, int limit,
|
|
Graphics context) {
|
|
return font.getLineMetrics(
|
|
chars, beginIndex, limit, myFRC(context));
|
|
}
|
|
|
|
/**
|
|
* Returns the {@link LineMetrics} object for the specified
|
|
* {@link CharacterIterator} in the specified {@link Graphics}
|
|
* context.
|
|
* @param ci the specified <code>CharacterIterator</code>
|
|
* @param beginIndex the initial offset in <code>ci</code>
|
|
* @param limit the end index of <code>ci</code>
|
|
* @param context the specified <code>Graphics</code> context
|
|
* @return a <code>LineMetrics</code> object created with the
|
|
* specified arguments.
|
|
* @see java.awt.Font#getLineMetrics(CharacterIterator, int, int, FontRenderContext)
|
|
*/
|
|
public LineMetrics getLineMetrics(CharacterIterator ci,
|
|
int beginIndex, int limit,
|
|
Graphics context) {
|
|
return font.getLineMetrics(ci, beginIndex, limit, myFRC(context));
|
|
}
|
|
|
|
/**
|
|
* Returns the bounds of the specified <code>String</code> in the
|
|
* specified <code>Graphics</code> context. The bounds is used
|
|
* to layout the <code>String</code>.
|
|
* <p>Note: The returned bounds is in baseline-relative coordinates
|
|
* (see {@link java.awt.FontMetrics class notes}).
|
|
* @param str the specified <code>String</code>
|
|
* @param context the specified <code>Graphics</code> context
|
|
* @return a {@link Rectangle2D} that is the bounding box of the
|
|
* specified <code>String</code> in the specified
|
|
* <code>Graphics</code> context.
|
|
* @see java.awt.Font#getStringBounds(String, FontRenderContext)
|
|
*/
|
|
public Rectangle2D getStringBounds( String str, Graphics context) {
|
|
return font.getStringBounds(str, myFRC(context));
|
|
}
|
|
|
|
/**
|
|
* Returns the bounds of the specified <code>String</code> in the
|
|
* specified <code>Graphics</code> context. The bounds is used
|
|
* to layout the <code>String</code>.
|
|
* <p>Note: The returned bounds is in baseline-relative coordinates
|
|
* (see {@link java.awt.FontMetrics class notes}).
|
|
* @param str the specified <code>String</code>
|
|
* @param beginIndex the offset of the beginning of <code>str</code>
|
|
* @param limit the end offset of <code>str</code>
|
|
* @param context the specified <code>Graphics</code> context
|
|
* @return a <code>Rectangle2D</code> that is the bounding box of the
|
|
* specified <code>String</code> in the specified
|
|
* <code>Graphics</code> context.
|
|
* @see java.awt.Font#getStringBounds(String, int, int, FontRenderContext)
|
|
*/
|
|
public Rectangle2D getStringBounds( String str,
|
|
int beginIndex, int limit,
|
|
Graphics context) {
|
|
return font.getStringBounds(str, beginIndex, limit,
|
|
myFRC(context));
|
|
}
|
|
|
|
/**
|
|
* Returns the bounds of the specified array of characters
|
|
* in the specified <code>Graphics</code> context.
|
|
* The bounds is used to layout the <code>String</code>
|
|
* created with the specified array of characters,
|
|
* <code>beginIndex</code> and <code>limit</code>.
|
|
* <p>Note: The returned bounds is in baseline-relative coordinates
|
|
* (see {@link java.awt.FontMetrics class notes}).
|
|
* @param chars an array of characters
|
|
* @param beginIndex the initial offset of the array of
|
|
* characters
|
|
* @param limit the end offset of the array of characters
|
|
* @param context the specified <code>Graphics</code> context
|
|
* @return a <code>Rectangle2D</code> that is the bounding box of the
|
|
* specified character array in the specified
|
|
* <code>Graphics</code> context.
|
|
* @see java.awt.Font#getStringBounds(char[], int, int, FontRenderContext)
|
|
*/
|
|
public Rectangle2D getStringBounds( char [] chars,
|
|
int beginIndex, int limit,
|
|
Graphics context) {
|
|
return font.getStringBounds(chars, beginIndex, limit,
|
|
myFRC(context));
|
|
}
|
|
|
|
/**
|
|
* Returns the bounds of the characters indexed in the specified
|
|
* <code>CharacterIterator</code> in the
|
|
* specified <code>Graphics</code> context.
|
|
* <p>Note: The returned bounds is in baseline-relative coordinates
|
|
* (see {@link java.awt.FontMetrics class notes}).
|
|
* @param ci the specified <code>CharacterIterator</code>
|
|
* @param beginIndex the initial offset in <code>ci</code>
|
|
* @param limit the end index of <code>ci</code>
|
|
* @param context the specified <code>Graphics</code> context
|
|
* @return a <code>Rectangle2D</code> that is the bounding box of the
|
|
* characters indexed in the specified <code>CharacterIterator</code>
|
|
* in the specified <code>Graphics</code> context.
|
|
* @see java.awt.Font#getStringBounds(CharacterIterator, int, int, FontRenderContext)
|
|
*/
|
|
public Rectangle2D getStringBounds(CharacterIterator ci,
|
|
int beginIndex, int limit,
|
|
Graphics context) {
|
|
return font.getStringBounds(ci, beginIndex, limit,
|
|
myFRC(context));
|
|
}
|
|
|
|
/**
|
|
* Returns the bounds for the character with the maximum bounds
|
|
* in the specified <code>Graphics</code> context.
|
|
* @param context the specified <code>Graphics</code> context
|
|
* @return a <code>Rectangle2D</code> that is the
|
|
* bounding box for the character with the maximum bounds.
|
|
* @see java.awt.Font#getMaxCharBounds(FontRenderContext)
|
|
*/
|
|
public Rectangle2D getMaxCharBounds(Graphics context) {
|
|
return font.getMaxCharBounds(myFRC(context));
|
|
}
|
|
|
|
private FontRenderContext myFRC(Graphics context) {
|
|
if (context instanceof Graphics2D) {
|
|
return ((Graphics2D)context).getFontRenderContext();
|
|
}
|
|
return DEFAULT_FRC;
|
|
}
|
|
|
|
|
|
/**
|
|
* Returns a representation of this <code>FontMetrics</code>
|
|
* object's values as a <code>String</code>.
|
|
* @return a <code>String</code> representation of this
|
|
* <code>FontMetrics</code> object.
|
|
* @since JDK1.0.
|
|
*/
|
|
public String toString() {
|
|
return getClass().getName() +
|
|
"[font=" + getFont() +
|
|
"ascent=" + getAscent() +
|
|
", descent=" + getDescent() +
|
|
", height=" + getHeight() + "]";
|
|
}
|
|
|
|
/**
|
|
* Initialize JNI field and method IDs
|
|
*/
|
|
private static native void initIDs();
|
|
}
|