get Font Kerning Pairs One Char - Java 2D Graphics

Java examples for 2D Graphics:Font

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Description

get Font Kerning Pairs One Char

Demo Code

/*// w ww.j  a v  a2  s. co m
 *  Copyright (C) 2010-2015 JPEXS, All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3.0 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.
 */
import java.awt.Font;
import java.awt.FontFormatException;
import java.awt.GraphicsEnvironment;
import java.awt.font.FontRenderContext;
import java.awt.font.GlyphVector;
import java.awt.font.TextAttribute;
import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.text.AttributedCharacterIterator;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import javax.swing.JPanel;

public class Main{
    private static List<KerningPair> getFontKerningPairsOneChar(
            List<Character> availableChars, Font font, char firstChar) {
        List<KerningPair> ret = new ArrayList<>();

        char[] chars = new char[availableChars.size() * 2];

        for (int i = 0; i < availableChars.size(); i++) {
            chars[i * 2] = firstChar;
            chars[i * 2 + 1] = availableChars.get(i);
        }

        Map<AttributedCharacterIterator.Attribute, Object> withKerningAttrs = new HashMap<>();

        withKerningAttrs.put(TextAttribute.FONT, font);
        withKerningAttrs.put(TextAttribute.KERNING,
                TextAttribute.KERNING_ON);
        Font withKerningFont = Font.getFont(withKerningAttrs);
        GlyphVector withKerningVector = withKerningFont.layoutGlyphVector(
                getFontRenderContext(withKerningFont), chars, 0,
                chars.length, Font.LAYOUT_LEFT_TO_RIGHT);
        int withKerningX[] = new int[availableChars.size()];
        for (int i = 0; i < availableChars.size(); i++) {
            withKerningX[i] = withKerningVector.getGlyphLogicalBounds(
                    i * 2 + 1).getBounds().x;
        }

        Map<AttributedCharacterIterator.Attribute, Object> noKerningAttrs = new HashMap<>();
        noKerningAttrs.put(TextAttribute.FONT, font);
        noKerningAttrs.put(TextAttribute.KERNING, 0);
        Font noKerningFont = Font.getFont(noKerningAttrs);
        GlyphVector noKerningVector = noKerningFont.layoutGlyphVector(
                getFontRenderContext(noKerningFont), chars, 0,
                chars.length, Font.LAYOUT_LEFT_TO_RIGHT);
        for (int i = 0; i < availableChars.size(); i++) {
            int noKerningX = noKerningVector.getGlyphLogicalBounds(
                    i * 2 + 1).getBounds().x;
            int kerning = withKerningX[i] - noKerningX;
            if (kerning > 0) {
                ret.add(new KerningPair(firstChar, availableChars.get(i),
                        kerning));
            }
        }
        return ret;
    }
    private static FontRenderContext getFontRenderContext(Font font) {
        return (new JPanel()).getFontMetrics(font).getFontRenderContext();
    }
}

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