alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (bug8016833.java)

This example Java source code file (bug8016833.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

assertion, awt, badlocationexception, bufferedimage, different, graphics, gui, image, interruptedexception, invocationtargetexception, jtextpane, override, rectangle, reflection, runnable, runtimeexception, string, styleddocument, swing, text

The bug8016833.java Java example source code

/*
 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/* @test
   @bug 8016833
   @summary underlines and strikethroughs should be  painted at the correct
            positions for different kind of text styles: normal, superscript and subscript
   @author Anton Nashatyrev
   @run main bug8016833
*/
import javax.swing.*;
import javax.swing.text.BadLocationException;
import javax.swing.text.Style;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyledDocument;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.lang.reflect.InvocationTargetException;

public class bug8016833 {

    void drawText(final Graphics g, final boolean underline, final boolean strikethrough, final boolean background) {
        drawText(g, "mama", underline, strikethrough, background);
    }

    void drawText(final Graphics g, final String text, final boolean underline, final boolean strikethrough, final boolean background) {
        try {
            SwingUtilities.invokeAndWait(new Runnable() {
                @Override
                public void run() {
                    final JTextPane comp = new JTextPane();
                    final StyledDocument doc = comp.getStyledDocument();

                    Style style = comp.addStyle("superscript", null);
                    setNormalStyle(style);

                    if (underline) {
                        StyleConstants.setUnderline(style, true);
                    }
                    if (strikethrough) {
                        StyleConstants.setStrikeThrough(style, true);
                    }
                    if (background) {
                        StyleConstants.setBackground(style, Color.BLUE);
                    }
                    try {
                        doc.insertString(doc.getLength(), "mama", style);
                    } catch (BadLocationException e) {
                        throw new RuntimeException(e);
                    }

                    comp.setSize(200, 100);
                    comp.paint(g);
                }
            });
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        } catch (InvocationTargetException e) {
            throw new RuntimeException(e);
        }
    }

    void setNormalStyle(Style style) {
        StyleConstants.setSuperscript(style, true);
    }

    int getEmptyPixel() {
        return 0xFFFFFFFF;
    }

    boolean isPixelEmpty(int argb) {
        return (argb & 0x00FFFFFF) == (getEmptyPixel() & 0x00FFFFFF);
    }

    boolean isLineEmpty(BufferedImage img, int coord, boolean isHorizontal) {
        int len = isHorizontal ? img.getWidth() : img.getHeight();
        for (int i = 0; i < len; i++) {
            int pixel = isHorizontal ? img.getRGB(i, coord) : img.getRGB(coord, i);
            if (!isPixelEmpty(pixel)) {
                return false;
            }
        }
        return true;
    }

    Rectangle getPixelsOutline(BufferedImage img) {
        int x1 = 0;
        while (x1 < img.getWidth() && isLineEmpty(img, x1, false)) {
            x1++;
        }
        int x2 = img.getWidth() - 1;
        while (x2 >= 0 && isLineEmpty(img, x2, false)) {
            x2--;
        }
        int y1 = 0;
        while (y1 < img.getHeight() && isLineEmpty(img, y1, true)) {
            y1++;
        }
        int y2 = img.getHeight() - 1;
        while (y2 >= 0 && isLineEmpty(img, y2, true)) {
            y2--;
        }

        return new Rectangle(x1, y1, x2 - x1 + 1, y2 - y1 + 1);
    }

    BufferedImage createImage() {
        final BufferedImage img = new BufferedImage(200, 100, BufferedImage.TYPE_INT_ARGB);
        try {
            SwingUtilities.invokeAndWait(new Runnable() {
                @Override
                public void run() {
                    Graphics g = img.getGraphics();
                    g.setColor(new Color(getEmptyPixel()));
                    g.fillRect(0, 0, 10000, 10000);
                }
            });
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        } catch (InvocationTargetException e) {
            throw new RuntimeException(e);
        }
        return img;
    }

    int subPixels(int pix1, int pix2) {
        if (pix1 == pix2) {
            return getEmptyPixel();
        }
        return pix1;
    }

    /**
     * Subtracts img2 from img1
     */
    BufferedImage subImages(BufferedImage img1, BufferedImage img2) {
        if (img1.getHeight() != img2.getHeight() ||
                img1.getWidth() != img2.getWidth()) {
            throw new RuntimeException("Different sizes");
        }
        BufferedImage ret = new BufferedImage(img1.getWidth(), img1.getHeight(), img1.getType());

        for (int x = 0; x < ret.getWidth(); x++) {
            for (int y = 0; y < ret.getHeight(); y++) {
                ret.setRGB(x, y, subPixels(img1.getRGB(x, y), img2.getRGB(x, y)));
            }
        }
        return ret;
    }

    void testUnderline() {
        System.out.println("  testUnderline()");

        final BufferedImage img1 = createImage();
        drawText(img1.getGraphics(), true, false, false);
        final Rectangle out1 = getPixelsOutline(img1);
        System.out.println("   Underlined: " + out1);

        final BufferedImage img2 = createImage();
        drawText(img2.getGraphics(), false, false, false);
        final Rectangle out2 = getPixelsOutline(img2);
        System.out.println("   Normal: " + out2);

        final BufferedImage img3 = subImages(img1, img2);
        final Rectangle out3 = getPixelsOutline(img3);
        System.out.println("   Sub: " + out3);

        // underline is not too thick
        assertTrue(out3.getHeight() <= 2);
        // not too wide
        assertTrue(out3.getWidth() * 0.8 < out2.getWidth());
        // not too low
        assertTrue(out3.getY() - (out1.getY() + out2.getHeight()) < 3);
        // not too high
        assertTrue(out3.getY() - (out1.getY() + out2.getHeight()) > 0);
    }

    void testStrikthrough() {
        System.out.println("  testStrikthrough()");

        final BufferedImage img1 = createImage();
        drawText(img1.getGraphics(), false, true, false);
        final Rectangle out1 = getPixelsOutline(img1);
        System.out.println("   Striked: " + out1);

        final BufferedImage img2 = createImage();
        drawText(img2.getGraphics(), false, false, false);
        final Rectangle out2 = getPixelsOutline(img2);
        System.out.println("   Normal: " + out2);

        final BufferedImage img3 = subImages(img1, img2);
        final Rectangle out3 = getPixelsOutline(img3);
        System.out.println("   Sub: " + out3);

        // strikethrough is not too thick
        assertTrue(out3.getHeight() <= 2);
        // not too wide
        assertTrue(out3.getWidth() * 0.8 < out2.getWidth());
        // not too low
        assertTrue(out3.getY() - (out1.getY() + out2.getHeight()) < 0);
        // not too high
        assertTrue(out3.getY() - out1.getY() > 1);
    }
    void assertTrue(boolean b) {
        if (!b) {
            throw new RuntimeException("Assertion failed");
        }
    }

    static void testSuperScript() {
        System.out.println("testSuperScript()");
        bug8016833 b = new bug8016833() {
            @Override
            void setNormalStyle(Style style) {
                StyleConstants.setSuperscript(style, true);
            }
        };
        b.testUnderline();
        b.testStrikthrough();
    }

    static void testSubScript() {
        System.out.println("testSubScript()");
        bug8016833 b = new bug8016833() {
            @Override
            void setNormalStyle(Style style) {
                StyleConstants.setSubscript(style, true);
            }
        };
        b.testUnderline();
        b.testStrikthrough();
    }

    static void testNormalScript() {
        System.out.println("testNormalScript()");
        bug8016833 b = new bug8016833() {
            @Override
            void setNormalStyle(Style style) {
            }
        };
        b.testUnderline();
        b.testStrikthrough();
    }

    public static void main(String[] args) {
        testSubScript();
        testSuperScript();
        testNormalScript();
    }
}

Other Java examples (source code examples)

Here is a short list of links related to this Java bug8016833.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.