SVGGlyph.java

// Copyright 2001-2006, FreeHEP.
package org.freehep.graphicsio.svg;

import java.awt.Shape;
import java.awt.font.GlyphMetrics;
import java.awt.geom.AffineTransform;

/**
 * Class for embedding a Font in a SVG file.
 * 
 * @author Steffen Greiffenberg
 * @version $Id: SVGGlyph.java,v 1.4 2009-08-17 21:44:45 murkle Exp $
 */
public class SVGGlyph {

	final public static int FONT_SIZE = 100;

	public static int UNITS_PER_EM = 2048;

	/**
	 * glyp
	 */
	private Shape glyph;

	/**
	 * Character index
	 */
	private int unicode;

	/**
	 * Metrics of that character
	 */
	private GlyphMetrics glyphMetrics;

	/**
	 * Flip the drawing upside down
	 */
	private static AffineTransform defaultTransform = new AffineTransform(1, 0,
			0, -1, 0, 0);

	/**
	 * stores the glyph data
	 * 
	 * @param unicode
	 * @param glyph
	 */
	public SVGGlyph(Shape glyph, int unicode, GlyphMetrics glyphMetrics) {

		this.unicode = unicode;
		this.glyph = glyph;
		this.glyphMetrics = glyphMetrics;
	}

	@Override
	public String toString() {
		StringBuffer result = new StringBuffer("<glyph ");

		// unicode
		result.append("unicode=\"");

		String hex = "0000" + Integer.toHexString(unicode);
		result.append("&#x");
		result.append(hex.substring(hex.length() - 4));
		result.append(';');
		result.append("\" ");

		if (glyphMetrics != null) {
			// advance X
			result.append(getHorizontalAdvanceXString());

			// advance Y
			result.append(getHorizontalAdvanceYString());
		}

		// path
		result.append(getPathString());
		result.append("/>");

		return result.toString();
	}

	/**
	 * @return SVG path tag using SVGGraphics2D and defaultTransform
	 */
	protected String getPathString() {
		return SVGGraphics2D
				.getPathContent(glyph.getPathIterator(defaultTransform));
	}

	/**
	 * @return SVG tag horiz-adv-x
	 */
	public String getHorizontalAdvanceXString() {
		StringBuffer result = new StringBuffer();

		if (glyphMetrics.getAdvanceX() != 0) {
			result.append("horiz-adv-x=\"");
			result.append(
					SVGGraphics2D.fixedPrecision(glyphMetrics.getAdvanceX()));
			result.append("\" ");
		}

		return result.toString();
	}

	/**
	 * @return SVG tag horiz-adv-y
	 */
	public String getHorizontalAdvanceYString() {
		StringBuffer result = new StringBuffer();

		if (glyphMetrics.getAdvanceY() != 0) {
			result.append("horiz-adv-y=\"");
			result.append(
					SVGGraphics2D.fixedPrecision(glyphMetrics.getAdvanceY()));
			result.append("\" ");
		}

		return result.toString();
	}
}