org.antlr.v4.gui.SystemFontMetrics Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of antlr4 Show documentation
Show all versions of antlr4 Show documentation
The ANTLR 4 grammar compiler.
/*
* Copyright (c) 2012 The ANTLR Project. All rights reserved.
* Use of this file is governed by the BSD-3-Clause license that
* can be found in the LICENSE.txt file in the project root.
*/
package org.antlr.v4.gui;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.GraphicsEnvironment;
import java.awt.font.FontRenderContext;
import java.awt.font.TextLayout;
import java.awt.image.BufferedImage;
/**
*
* @author Sam Harwell
*/
public class SystemFontMetrics extends BasicFontMetrics {
protected final Font font;
public SystemFontMetrics(String fontName) {
BufferedImage img = new BufferedImage(40, 40, BufferedImage.TYPE_4BYTE_ABGR);
Graphics2D graphics = GraphicsEnvironment.getLocalGraphicsEnvironment().createGraphics(img);
FontRenderContext fontRenderContext = graphics.getFontRenderContext();
this.font = new Font(fontName, Font.PLAIN, 1000);
double maxHeight = 0;
for (int i = 0; i < 255; i++) {
TextLayout layout = new TextLayout(Character.toString((char)i), font, fontRenderContext);
maxHeight = Math.max(maxHeight, layout.getBounds().getHeight());
super.widths[i] = (int)layout.getAdvance();
}
super.maxCharHeight = (int)Math.round(maxHeight);
}
public Font getFont() {
return font;
}
}