com.github.mathiewz.slick.svg.inkscape.PolygonProcessor 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.Polygon;
import com.github.mathiewz.slick.geom.Shape;
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 polygon and path elements marked as not an arc.
 *
 * @author kevin
 */
public class PolygonProcessor 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;

        boolean moved = false;
        boolean closed = false;

        while (tokens.hasMoreTokens()) {
            String nextToken = tokens.nextToken();
            if (nextToken.equals("L")) {
                continue;
            }
            if (nextToken.equals("z")) {
                closed = true;
                break;
            }
            if (nextToken.equals("M")) {
                if (!moved) {
                    moved = true;
                    continue;
                }

                return 0;
            }
            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);
            }
        }

        poly.setClosed(closed);
        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);

        String points = element.getAttribute("points");
        if (element.getNodeName().equals("path")) {
            points = element.getAttribute("d");
        }

        StringTokenizer tokens = new StringTokenizer(points, ", ");
        Polygon poly = new Polygon();
        int count = processPoly(poly, element, tokens);

        NonGeometricData data = Util.getNonGeometricData(element);
        if (count > 3) {
            Shape shape = poly.transform(transform);

            diagram.addFigure(new Figure(Figure.POLYGON, shape, 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("polygon")) {
            return true;
        }

        if (element.getNodeName().equals("path")) {
            if (!"arc".equals(element.getAttributeNS(Util.SODIPODI, "type"))) {
                return true;
            }
        }

        return false;
    }
}