001/* ============
002 * FXGraphics2D
003 * ============
004 * 
005 * (C)opyright 2014-2022, by David Gilbert.
006 * 
007 * https://github.com/jfree/fxgraphics2d
008 *
009 * The FXGraphics2D class has been developed by David Gilbert for
010 * use in Orson Charts (https://github.com/jfree/orson-charts) and
011 * JFreeChart (http://www.jfree.org/jfreechart).  It may be useful for other
012 * code that uses the Graphics2D API provided by Java2D.
013 * 
014 * Redistribution and use in source and binary forms, with or without
015 * modification, are permitted provided that the following conditions are met:
016 *   - Redistributions of source code must retain the above copyright
017 *     notice, this list of conditions and the following disclaimer.
018 *   - Redistributions in binary form must reproduce the above copyright
019 *     notice, this list of conditions and the following disclaimer in the
020 *     documentation and/or other materials provided with the distribution.
021 *   - Neither the name of JFree.org nor the names of its contributors may
022 *     be used to endorse or promote products derived from this software
023 *     without specific prior written permission.
024 *
025 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
026 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
027 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
028 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
029 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
030 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
031 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
032 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
033 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
034 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
035 * THE POSSIBILITY OF SUCH DAMAGE.
036 * 
037 */
038
039package org.jfree.fx;
040
041import java.awt.Font;
042import java.awt.FontMetrics;
043import java.awt.Graphics;
044import java.awt.Graphics2D;
045import java.awt.geom.Rectangle2D;
046import java.text.CharacterIterator;
047import javafx.geometry.Bounds;
048import javafx.scene.text.FontPosture;
049import javafx.scene.text.FontWeight;
050import javafx.scene.text.Text;
051
052/**
053 * A font metrics implementation for JavaFX.  This uses the JavaFX APIs to
054 * get string bounds, which is more exact than relying on the Java2D/AWT
055 * measurements.  The remaining font metrics, however, still come from 
056 * Java2D/AWT.
057 * 
058 * @since 1.5
059 */
060public class FXFontMetrics extends FontMetrics {
061
062    /** The graphics target. */
063    private final Graphics2D g2;
064    
065    /**
066     * Creates a new instance.
067     * 
068     * @param font  the font ({@code null} not permitted).
069     * @param g2  the graphics target ({@code null} not permitted).
070     */
071    public FXFontMetrics(Font font, Graphics2D g2) {
072        super(font);
073        this.g2 = g2;
074    }
075
076    @Override
077    public Rectangle2D getStringBounds(CharacterIterator ci, int beginIndex, 
078            int limit, Graphics context) {
079        char[]  arr = new char[limit - beginIndex];
080        ci.setIndex(beginIndex);
081        for(int idx = 0; idx < arr.length; idx++) {
082            arr[idx] = ci.current();
083            ci.next();
084        }
085        return getStringBounds(arr, beginIndex, limit, context);
086    }
087
088    @Override
089    public Rectangle2D getStringBounds(char[] chars, int beginIndex, int limit, 
090            Graphics context) {
091        String str = new String(chars, beginIndex, limit - beginIndex);
092        return getStringBounds(str, context);
093    }
094
095    @Override
096    public Rectangle2D getStringBounds(String str, int beginIndex, int limit, 
097            Graphics context) {
098        String substr = str.substring(beginIndex, limit);
099        return super.getStringBounds(substr, context);
100    }
101
102    @Override
103    public Rectangle2D getStringBounds(String str, Graphics context) {
104        Text text = new Text(str);
105        FontWeight weight = font.isBold() ? FontWeight.BOLD : FontWeight.NORMAL;
106        FontPosture posture = font.isItalic() 
107                ? FontPosture.ITALIC : FontPosture.REGULAR;
108        javafx.scene.text.Font jfxfont = javafx.scene.text.Font.font(
109                font.getFamily(), weight, posture, font.getSize());
110        text.setFont(jfxfont);
111        Bounds b = text.getLayoutBounds();
112        return new Rectangle2D.Double(b.getMinX(), b.getMinY(), b.getWidth(), 
113                b.getHeight());
114    }
115
116    @Override
117    public int stringWidth(String str) {
118        return (int) getStringBounds(str, this.g2).getWidth();
119    }
120    
121}