eu.europa.esig.dss.pdf.pdfbox.visible.defaultdrawer.JavaDSSFontMetrics Maven / Gradle / Ivy
/**
* DSS - Digital Signature Services
* Copyright (C) 2015 European Commission, provided under the CEF programme
*
* This file is part of the "DSS - Digital Signature Services" project.
*
* 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 2.1 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; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package eu.europa.esig.dss.pdf.pdfbox.visible.defaultdrawer;
import eu.europa.esig.dss.pdf.visible.AbstractDSSFontMetrics;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
/**
* Contains font metrics for a Java font
*/
public class JavaDSSFontMetrics extends AbstractDSSFontMetrics {
/** The Java font to be used */
private Font javaFont;
/** Cached instance of font metrics */
private FontMetrics fontMetrics;
/**
* Default constructor
*
* @param javaFont {@link Font}
*/
public JavaDSSFontMetrics(Font javaFont) {
this.javaFont = javaFont;
}
private FontMetrics getFontMetrics(float fontSize) {
if (fontMetrics != null && javaFont.getSize() == fontSize) {
return fontMetrics;
}
this.javaFont = javaFont.deriveFont(fontSize);
BufferedImage img = new BufferedImage(1, 1, BufferedImage.TYPE_INT_RGB);
Graphics g = img.getGraphics();
g.setFont(javaFont);
this.fontMetrics = g.getFontMetrics(javaFont);
g.dispose();
return fontMetrics;
}
@Override
public float getWidth(String str, float size) {
return getFontMetrics(size).stringWidth(str);
}
@Override
public float getHeight(String str, float size) {
return getFontMetrics(size).getHeight() / 1.05f; // default height is too large
}
/**
* Returns the max ascent for the given font {@code size}
*
* @param size font size
* @return max ascent
*/
public float getMaxAscent(float size) {
return getFontMetrics(size).getMaxAscent();
}
}