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 
  31 import javax.swing.*;
  32 import java.awt.*;
  33 import static java.awt.RenderingHints.*;
  34 
  35 public 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 }