1 /*
   2  * Copyright (c) 2008, 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  * @bug 6685312
  27  * @summary Check advance of LCD text on a scaled graphics.
  28  */
  29 
  30 import javax.swing.*;
  31 import java.awt.*;
  32 import static java.awt.RenderingHints.*;
  33 
  34 public class ScaledLCDTextMetrics extends Component {
  35 
  36     public static void main(String[] args) {
  37         JFrame f = new JFrame();
  38         f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  39         f.add("Center", new ScaledLCDTextMetrics());
  40         f.pack();
  41         f.setVisible(true);
  42     }
  43 
  44     public Dimension getPreferredSize() {
  45       return new Dimension(200,100);
  46     }
  47     public void paint(Graphics g) {
  48        Graphics2D g2 = (Graphics2D)g;
  49 
  50        Font f = new Font("Tahoma", Font.PLAIN, 11);
  51        g.setFont(f);
  52        g.setColor(Color.white);
  53        g.fillRect(0,0,400,300);
  54        g.setColor(Color.black);
  55        g2.setRenderingHint(KEY_TEXT_ANTIALIASING,VALUE_TEXT_ANTIALIAS_LCD_HRGB);
  56        String text = "ABCDEFGHIJKLI";
  57 
  58        FontMetrics fm1 = g2.getFontMetrics();
  59        int adv1 = fm1.stringWidth(text);
  60        g.drawString(text, 5, 20);
  61 
  62        g2.scale(2,2);
  63 
  64        FontMetrics fm2 = g2.getFontMetrics();
  65        int adv2 = fm2.stringWidth(text);
  66        g.drawString(text, 5, 40);
  67 
  68        double frac = Math.abs(adv1/(double)adv2);
  69 
  70        System.out.println("scalex1: " + adv1);
  71        System.out.println("scalex2: " + adv2);
  72        System.out.println("Fraction : "+ frac);
  73 
  74        // adv1 will not be exactly the same as adv2, but should differ
  75        // only by a fraction.
  76 
  77        if (frac < 0.8 || frac > 1.2) {
  78            throw new RuntimeException("Metrics differ " +
  79            "Adv1="+adv1+" Adv2="+adv2+" Fraction="+frac);
  80        }
  81     }
  82 }