com.github.mathiewz.slick.svg.inkscape.DefsProcessor 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.ArrayList;

import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

import com.github.mathiewz.slick.Color;
import com.github.mathiewz.slick.geom.Transform;
import com.github.mathiewz.slick.svg.Diagram;
import com.github.mathiewz.slick.svg.Gradient;
import com.github.mathiewz.slick.svg.Loader;
import com.github.mathiewz.slick.util.Log;

/**
 * A processor for the defs node
 *
 * @author kevin
 */
public class DefsProcessor implements ElementProcessor {
    
    /**
     * @see com.github.mathiewz.slick.svg.inkscape.ElementProcessor#handles(org.w3c.dom.Element)
     */
    @Override
    public boolean handles(Element element) {
        if (element.getNodeName().equals("defs")) {
            return true;
        }
        
        return false;
    }
    
    /**
     * @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 transform) {
        NodeList patterns = element.getElementsByTagName("pattern");
        
        for (int i = 0; i < patterns.getLength(); i++) {
            Element pattern = (Element) patterns.item(i);
            NodeList list = pattern.getElementsByTagName("image");
            if (list.getLength() == 0) {
                Log.warn("Pattern 1981 does not specify an image. Only image patterns are supported.");
                continue;
            }
            Element image = (Element) list.item(0);
            
            String patternName = pattern.getAttribute("id");
            String ref = image.getAttributeNS(Util.XLINK, "href");
            diagram.addPatternDef(patternName, ref);
        }
        
        NodeList linear = element.getElementsByTagName("linearGradient");
        ArrayList toResolve = new ArrayList<>();
        
        for (int i = 0; i < linear.getLength(); i++) {
            Element lin = (Element) linear.item(i);
            String name = lin.getAttribute("id");
            Gradient gradient = new Gradient(name, false);
            
            gradient.setTransform(Util.getTransform(lin, "gradientTransform"));
            
            if (stringLength(lin.getAttribute("x1")) > 0) {
                gradient.setX1(Float.parseFloat(lin.getAttribute("x1")));
            }
            if (stringLength(lin.getAttribute("x2")) > 0) {
                gradient.setX2(Float.parseFloat(lin.getAttribute("x2")));
            }
            if (stringLength(lin.getAttribute("y1")) > 0) {
                gradient.setY1(Float.parseFloat(lin.getAttribute("y1")));
            }
            if (stringLength(lin.getAttribute("y2")) > 0) {
                gradient.setY2(Float.parseFloat(lin.getAttribute("y2")));
            }
            
            String ref = lin.getAttributeNS("http://www.w3.org/1999/xlink", "href");
            if (stringLength(ref) > 0) {
                gradient.reference(ref.substring(1));
                toResolve.add(gradient);
            } else {
                NodeList steps = lin.getElementsByTagName("stop");
                for (int j = 0; j < steps.getLength(); j++) {
                    Element s = (Element) steps.item(j);
                    float offset = Float.parseFloat(s.getAttribute("offset"));
                    
                    String colInt = Util.extractStyle(s.getAttribute("style"), "stop-color");
                    String opaInt = Util.extractStyle(s.getAttribute("style"), "stop-opacity");
                    
                    int col = Integer.parseInt(colInt.substring(1), 16);
                    Color stopColor = new Color(col);
                    stopColor.a = Float.parseFloat(opaInt);
                    
                    gradient.addStep(offset, stopColor);
                }
                
                gradient.getImage();
            }
            
            diagram.addGradient(name, gradient);
        }
        
        NodeList radial = element.getElementsByTagName("radialGradient");
        for (int i = 0; i < radial.getLength(); i++) {
            Element rad = (Element) radial.item(i);
            String name = rad.getAttribute("id");
            Gradient gradient = new Gradient(name, true);
            
            gradient.setTransform(Util.getTransform(rad, "gradientTransform"));
            
            if (stringLength(rad.getAttribute("cx")) > 0) {
                gradient.setX1(Float.parseFloat(rad.getAttribute("cx")));
            }
            if (stringLength(rad.getAttribute("cy")) > 0) {
                gradient.setY1(Float.parseFloat(rad.getAttribute("cy")));
            }
            if (stringLength(rad.getAttribute("fx")) > 0) {
                gradient.setX2(Float.parseFloat(rad.getAttribute("fx")));
            }
            if (stringLength(rad.getAttribute("fy")) > 0) {
                gradient.setY2(Float.parseFloat(rad.getAttribute("fy")));
            }
            if (stringLength(rad.getAttribute("r")) > 0) {
                gradient.setR(Float.parseFloat(rad.getAttribute("r")));
            }
            
            String ref = rad.getAttributeNS("http://www.w3.org/1999/xlink", "href");
            if (stringLength(ref) > 0) {
                gradient.reference(ref.substring(1));
                toResolve.add(gradient);
            } else {
                NodeList steps = rad.getElementsByTagName("stop");
                for (int j = 0; j < steps.getLength(); j++) {
                    Element s = (Element) steps.item(j);
                    float offset = Float.parseFloat(s.getAttribute("offset"));
                    
                    String colInt = Util.extractStyle(s.getAttribute("style"), "stop-color");
                    String opaInt = Util.extractStyle(s.getAttribute("style"), "stop-opacity");
                    
                    int col = Integer.parseInt(colInt.substring(1), 16);
                    Color stopColor = new Color(col);
                    stopColor.a = Float.parseFloat(opaInt);
                    
                    gradient.addStep(offset, stopColor);
                }
                
                gradient.getImage();
            }
            
            diagram.addGradient(name, gradient);
        }
        
        for (int i = 0; i < toResolve.size(); i++) {
            toResolve.get(i).resolve(diagram);
            toResolve.get(i).getImage();
        }
    }
    
    /**
     * Utility to cope with null values
     *
     * @param value
     *            The value to get the length of
     * @return The length of the string
     */
    private int stringLength(String value) {
        if (value == null) {
            return 0;
        }
        
        return value.length();
    }
}