1/*
2 * Copyright (c) 2008, 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 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/**
25 * @test
26 * @key headful
27 * @bug 6685312
28 * @summary Check advance of LCD text on a scaled graphics.
29 */
30
31import javax.swing.*;
32import java.awt.*;
33import static java.awt.RenderingHints.*;
34
35public class ScaledLCDTextMetrics extends Component {
36
37    public static void main(String[] args) {
38        JFrame f = new JFrame();
39        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
40        f.add("Center", new ScaledLCDTextMetrics());
41        f.pack();
42        f.setVisible(true);
43    }
44
45    public Dimension getPreferredSize() {
46      return new Dimension(200,100);
47    }
48    public void paint(Graphics g) {
49       Graphics2D g2 = (Graphics2D)g;
50
51       Font f = new Font("Tahoma", Font.PLAIN, 11);
52       g.setFont(f);
53       g.setColor(Color.white);
54       g.fillRect(0,0,400,300);
55       g.setColor(Color.black);
56       g2.setRenderingHint(KEY_TEXT_ANTIALIASING,VALUE_TEXT_ANTIALIAS_LCD_HRGB);
57       String text = "ABCDEFGHIJKLI";
58
59       FontMetrics fm1 = g2.getFontMetrics();
60       int adv1 = fm1.stringWidth(text);
61       g.drawString(text, 5, 20);
62
63       g2.scale(2,2);
64
65       FontMetrics fm2 = g2.getFontMetrics();
66       int adv2 = fm2.stringWidth(text);
67       g.drawString(text, 5, 40);
68
69       double frac = Math.abs(adv1/(double)adv2);
70
71       System.out.println("scalex1: " + adv1);
72       System.out.println("scalex2: " + adv2);
73       System.out.println("Fraction : "+ frac);
74
75       // adv1 will not be exactly the same as adv2, but should differ
76       // only by a fraction.
77
78       if (frac < 0.8 || frac > 1.2) {
79           throw new RuntimeException("Metrics differ " +
80           "Adv1="+adv1+" Adv2="+adv2+" Fraction="+frac);
81       }
82    }
83}
84