com.github.mathiewz.slick.svg.inkscape.LineProcessor Maven / Gradle / Ivy

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The main purpose of this libraryis to modernize and maintain the slick2D library.
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package com.github.mathiewz.slick.svg.inkscape;

import java.util.StringTokenizer;

import org.w3c.dom.Element;

import com.github.mathiewz.slick.geom.Line;
import com.github.mathiewz.slick.geom.Polygon;
import com.github.mathiewz.slick.geom.Transform;
import com.github.mathiewz.slick.svg.Diagram;
import com.github.mathiewz.slick.svg.Figure;
import com.github.mathiewz.slick.svg.Loader;
import com.github.mathiewz.slick.svg.NonGeometricData;
import com.github.mathiewz.slick.svg.ParsingException;

/**
 * A processor for the line element
 *
 * @author kevin
 */
public class LineProcessor implements ElementProcessor {

    /**
     * Process the points in a polygon definition
     *
     * @param poly
     *            The polygon being built
     * @param element
     *            The XML element being read
     * @param tokens
     *            The tokens representing the path
     * @return The number of points found
     */
    private static int processPoly(Polygon poly, Element element, StringTokenizer tokens) {
        int count = 0;

        while (tokens.hasMoreTokens()) {
            String nextToken = tokens.nextToken();
            if (nextToken.equals("L")) {
                continue;
            }
            if (nextToken.equals("z")) {
                break;
            }
            if (nextToken.equals("M")) {
                continue;
            }
            if (nextToken.equals("C")) {
                return 0;
            }

            String tokenX = nextToken;
            String tokenY = tokens.nextToken();

            try {
                float x = Float.parseFloat(tokenX);
                float y = Float.parseFloat(tokenY);

                poly.addPoint(x, y);
                count++;
            } catch (NumberFormatException e) {
                throw new ParsingException(element.getAttribute("id"), "Invalid token in points list", e);
            }
        }

        return count;
    }

    /**
     * @see com.github.mathiewz.slick.svg.inkscape.ElementProcessor#process(com.github.mathiewz.slick.svg.Loader, org.w3c.dom.Element, com.github.mathiewz.slick.svg.Diagram, com.github.mathiewz.slick.geom.Transform)
     */
    @Override
    public void process(Loader loader, Element element, Diagram diagram, Transform t) {
        Transform transform = Util.getTransform(element);
        transform = new Transform(t, transform);

        float x1;
        float y1;
        float x2;
        float y2;

        if (element.getNodeName().equals("line")) {
            x1 = Float.parseFloat(element.getAttribute("x1"));
            x2 = Float.parseFloat(element.getAttribute("x2"));
            y1 = Float.parseFloat(element.getAttribute("y1"));
            y2 = Float.parseFloat(element.getAttribute("y2"));
        } else {
            String points = element.getAttribute("d");
            StringTokenizer tokens = new StringTokenizer(points, ", ");
            Polygon poly = new Polygon();
            if (processPoly(poly, element, tokens) == 2) {
                x1 = poly.getPoint(0)[0];
                y1 = poly.getPoint(0)[1];
                x2 = poly.getPoint(1)[0];
                y2 = poly.getPoint(1)[1];
            } else {
                return;
            }
        }

        Float[] in = new Float[] { x1, y1, x2, y2 };
        Float[] out = new Float[4];

        transform.transform(in, 0, out, 0, 2);
        Line line = new Line(out[0], out[1], out[2], out[3]);

        NonGeometricData data = Util.getNonGeometricData(element);
        data.addAttribute("x1", "" + x1);
        data.addAttribute("x2", "" + x2);
        data.addAttribute("y1", "" + y1);
        data.addAttribute("y2", "" + y2);

        diagram.addFigure(new Figure(Figure.LINE, line, data, transform));
    }

    /**
     * @see com.github.mathiewz.slick.svg.inkscape.ElementProcessor#handles(org.w3c.dom.Element)
     */
    @Override
    public boolean handles(Element element) {
        if (element.getNodeName().equals("line")) {
            return true;
        }
        if (element.getNodeName().equals("path")) {
            if (!"arc".equals(element.getAttributeNS(Util.SODIPODI, "type"))) {
                return true;
            }
        }

        return false;
    }
}