com.vividsolutions.jts.awt.FontGlyphReader Maven / Gradle / Ivy
/*
* The JTS Topology Suite is a collection of Java classes that
* implement the fundamental operations required to validate a given
* geo-spatial data set to a known topological specification.
*
* Copyright (C) 2001 Vivid Solutions
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* For more information, contact:
*
* Vivid Solutions
* Suite #1A
* 2328 Government Street
* Victoria BC V8T 5G5
* Canada
*
* (250)385-6040
* www.vividsolutions.com
*/
package com.vividsolutions.jts.awt;
import java.util.*;
import java.awt.Font;
import java.awt.font.*;
import com.vividsolutions.jts.geom.*;
/**
* Provides methods to read {@link Font} glyphs for strings
* into {@link Polygonal} geometry.
*
* It is suggested to use larger point sizes to render fonts glyphs,
* to reduce the effects of scale-dependent hints.
* The result geometry is in the base coordinate system of the font.
* The geometry can be further transformed as necessary using
* {@link AffineTransformation}s.
*
* @author Martin Davis
*
*/
public class FontGlyphReader
{
/**
* The font name of the Java logical font Serif.
*/
public static final String FONT_SERIF = "Serif";
/**
* The font name of the Java logical font SansSerif.
*
* DEPRECATED - use FONT_SANSSERIF
*/
public static final String FONT_SANSERIF = "SansSerif";
/**
* The font name of the Java logical font SansSerif.
*/
public static final String FONT_SANSSERIF = "SansSerif";
/**
* The font name of the Java logical font Monospaced.
*/
public static final String FONT_MONOSPACED = "Monospaced";
// a flatness factor empirically determined to provide good results
private static final double FLATNESS_FACTOR = 400;
/**
* Converts text rendered in the given font and pointsize to a {@link Geometry}
* using a standard flatness factor.
*
* @param text the text to render
* @param fontName the name of the font
* @param pointSize the pointSize to render at
* @param geomFact the geometryFactory to use to create the result
* @return a polygonal geometry representing the rendered text
*/
public static Geometry read(String text, String fontName, int pointSize, GeometryFactory geomFact)
{
return read(text, new Font(fontName, Font.PLAIN, pointSize), geomFact);
}
/**
* Converts text rendered in the given {@link Font} to a {@link Geometry}
* using a standard flatness factor.
*
* @param text the text to render
* @param font the font to render with
* @param geomFact the geometryFactory to use to create the result
* @return a polygonal geometry representing the rendered text
*/
public static Geometry read(String text, Font font, GeometryFactory geomFact)
{
double flatness = font.getSize() / FLATNESS_FACTOR;
return read(text, font, flatness, geomFact);
}
/**
* Converts text rendered in the given {@link Font} to a {@link Geometry}
*
* @param text the text to render
* @param font the font to render with
* @param flatness the flatness factor to use
* @param geomFact the geometryFactory to use to create the result
* @return a polygonal geometry representing the rendered text
*/
public static Geometry read(String text, Font font, double flatness, GeometryFactory geomFact)
{
char[] chs = text.toCharArray();
FontRenderContext fontContext = new FontRenderContext(null, false, true);
GlyphVector gv = font.createGlyphVector(fontContext, chs);
List polys = new ArrayList();
for (int i = 0; i < gv.getNumGlyphs(); i++) {
Geometry geom = ShapeReader.read(gv.getGlyphOutline(i), flatness, geomFact);
for (int j = 0; j < geom.getNumGeometries(); j++) {
polys.add(geom.getGeometryN(j));
}
}
return geomFact.buildGeometry(polys);
}
}