1/*
2 * Copyright (c) 2006, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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22 */
23
24
25/**
26 * @test
27 * @key headful
28 * @bug 6216010
29 * @summary check to see that underline thickness scales.
30 * @run main UnderlineTest
31 */
32
33import java.awt.Color;
34import java.awt.Container;
35import java.awt.Dimension;
36import java.awt.Font;
37import java.awt.Graphics;
38import java.awt.Graphics2D;
39import java.awt.GridLayout;
40import java.awt.font.FontRenderContext;
41import java.awt.font.LineMetrics;
42import java.awt.font.TextAttribute;
43import java.awt.font.TextLayout;
44import java.awt.geom.AffineTransform;
45import java.util.HashMap;
46import javax.swing.JComponent;
47import javax.swing.JFrame;
48import javax.swing.JScrollPane;
49
50public class UnderlineTest {
51    static class FontsPanel extends Container {
52        FontsPanel(Font[] fonts) {
53            setLayout(new GridLayout(0, 1));
54            for (int i = 0; i < fonts.length; ++i) {
55              add(new FontPanel(fonts[i]));
56            }
57        }
58    }
59
60    static String fps = "Stellar glyphs";
61    static Dimension fpd = new Dimension(600, 120);
62    static class FontPanel extends JComponent {
63        Font f;
64        FontPanel(Font f) {
65            this.f = f;
66            setPreferredSize(fpd);
67            setMinimumSize(fpd);
68            setMaximumSize(fpd);
69            setSize(fpd);
70        }
71
72        public void paintComponent(Graphics g) {
73            g.setColor(Color.WHITE);
74            g.fillRect(0, 0, fpd.width, fpd.height);
75
76            g.setColor(Color.RED);
77            FontRenderContext frc = ((Graphics2D)g).getFontRenderContext();
78            LineMetrics lm = f.getLineMetrics(fps, frc);
79            int h = (int)(fpd.height - 20 - lm.getAscent());
80            g.drawLine(20, h, fpd.width - 20, h);
81            h = fpd.height - 20;
82            g.drawLine(20, h, fpd.width - 20, h);
83            h = (int)(fpd.height - 20 + lm.getDescent());
84            g.drawLine(20, h, fpd.width - 20, h);
85
86            g.setColor(Color.BLACK);
87            g.setFont(f);
88            g.drawString(fps, 50, fpd.height - 20);
89        }
90    }
91
92    public static void main(String args[]) {
93        String fontName = "Lucida Sans";
94        if (args.length > 0) {
95            fontName = args[0];
96        }
97        FontRenderContext frc = new FontRenderContext(null, false, false);
98        FontRenderContext frc2 = new FontRenderContext(AffineTransform.getScaleInstance(1.5, 1.5), false, false);
99
100        Font font0 = new Font(fontName, 0, 20);
101        HashMap map = new HashMap();
102        map.put(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_ON);
103        map.put(TextAttribute.STRIKETHROUGH, TextAttribute.STRIKETHROUGH_ON);
104        Font font = font0.deriveFont(map);
105
106        System.out.println("Using font: " + font);
107
108        double rot = -Math.PI/4;
109        AffineTransform scrtx = AffineTransform.getRotateInstance(rot);
110        scrtx.scale(1, 2);
111
112        Font[] fonts = {
113            font.deriveFont(1f),
114            font.deriveFont(20f),
115            font.deriveFont(40f),
116            font.deriveFont(80f),
117            font.deriveFont(AffineTransform.getRotateInstance(rot)),
118            font.deriveFont(AffineTransform.getScaleInstance(1, 2)),
119            font.deriveFont(AffineTransform.getScaleInstance(2, 4)),
120            font.deriveFont(scrtx),
121        };
122
123        LineMetrics[] metrics = new LineMetrics[fonts.length * 2];
124        for (int i = 0; i < metrics.length; ++i) {
125            Font f = fonts[i % fonts.length];
126            FontRenderContext frcx = i < fonts.length ? frc : frc2;
127            metrics[i] = f.getLineMetrics("X", frcx);
128      //       dumpMetrics("Metrics for " + f.getSize2D() + " pt. font,\n  tx: " +
129      //       f.getTransform() + ",\n   frctx: " + frcx.getTransform(), metrics[i]);
130        }
131
132        // test for linear scale
133        // this seems to work, might need to get fancy to deal with last-significant-bit issues?
134        double ds1 = metrics[2].getStrikethroughOffset() - metrics[1].getStrikethroughOffset();
135        double du1 = metrics[2].getUnderlineThickness() - metrics[1].getUnderlineThickness();
136        double ds2 = metrics[3].getStrikethroughOffset() - metrics[2].getStrikethroughOffset();
137        double du2 = metrics[3].getUnderlineThickness() - metrics[2].getUnderlineThickness();
138        if (ds2 != ds1 * 2 || du2 != du1 * 2) {
139            throw new IllegalStateException("non-linear scale: " + ds1 + " / " + ds2 + ", " +
140                                            du1 + " / " + du2);
141        }
142
143        JFrame jf = new JFrame("Fonts");
144        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
145        jf.add(new JScrollPane(new FontsPanel(fonts)));
146        jf.pack();
147        jf.setVisible(true);
148    }
149
150    static void dumpMetrics(String header, LineMetrics lm) {
151        if (header != null) {
152            System.out.println(header);
153        }
154        System.out.println("asc: " + lm.getAscent());
155        System.out.println("dsc: " + lm.getDescent());
156        System.out.println("ulo: " + lm.getUnderlineOffset());
157        System.out.println("ult: " + lm.getUnderlineThickness());
158        System.out.println("sto: " + lm.getStrikethroughOffset());
159        System.out.println("stt: " + lm.getStrikethroughThickness());
160    }
161}
162