// 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 8584 2006-08-10 23:06:37Z duns $
 */
public class SVGGlyph {

    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;
    }

    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();
    }
}