source: josm/trunk/src/com/kitfox/svg/ClipPath.java@ 5369

/*
 * Stop.java
 *
 *
 *  The Salamander Project - 2D and 3D graphics libraries in Java
 *  Copyright (C) 2004 Mark McKay
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 *  Mark McKay can be contacted at mark@kitfox.com.  Salamander and other
 *  projects can be found at http://www.kitfox.com
 *
 * Created on January 26, 2004, 1:56 AM
 */

package com.kitfox.svg;

import com.kitfox.svg.xml.StyleAttribute;
import java.awt.Shape;
import java.awt.geom.Area;
import java.util.Iterator;

/**
 * @author Mark McKay
 * @author <a href="mailto:mark@kitfox.com">Mark McKay</a>
 */
public class ClipPath extends SVGElement 
{

    public static final int CP_USER_SPACE_ON_USE = 0;
    public static final int CP_OBJECT_BOUNDING_BOX = 1;

    int clipPathUnits = CP_USER_SPACE_ON_USE;

    /** Creates a new instance of Stop */
    public ClipPath() {
    }
/*
    public void loaderStartElement(SVGLoaderHelper helper, Attributes attrs, SVGElement parent)
    {
                //Load style string
        super.loaderStartElement(helper, attrs, parent);

        String clipPathUnits = attrs.getValue("clipPathUnits");

        if (clipPathUnits.equals("objectBoundingBox")) this.clipPathUnits = CP_OBJECT_BOUNDING_BOX;

    }
*/
    /**
     * Called after the start element but before the end element to indicate
     * each child tag that has been processed
     */
    public void loaderAddChild(SVGLoaderHelper helper, SVGElement child) throws SVGElementException
    {
                super.loaderAddChild(helper, child);

//        if (child instanceof ShapeElement) members.add(child);
    }

    /*
    public void loaderEndElement(SVGLoaderHelper helper)
    {
//        super.loaderEndElement(helper);

//        build();
    }
    */
    
    protected void build() throws SVGException
    {
        super.build();
        
        StyleAttribute sty = new StyleAttribute();
        
        clipPathUnits = (getPres(sty.setName("clipPathUnits"))
            && sty.getStringValue().equals("objectBoundingBox")) 
            ? CP_OBJECT_BOUNDING_BOX 
            : CP_USER_SPACE_ON_USE;
    }
    
    public int getClipPathUnits()
    {
        return clipPathUnits;
    }

    public Shape getClipPathShape()
    {
        if (children.size() == 0) return null;
        if (children.size() == 1) return ((ShapeElement)children.get(0)).getShape();

        Area clipArea = null;
        for (Iterator it = children.iterator(); it.hasNext();)
        {
            ShapeElement se = (ShapeElement)it.next();

            if (clipArea == null)
            {
                Shape shape = se.getShape();
                if (shape != null) clipArea = new Area(se.getShape());
                continue;
            }

            Shape shape = se.getShape();
            if (shape != null) clipArea.intersect(new Area(shape));
        }

        return clipArea;
    }

    /**
     * Updates all attributes in this diagram associated with a time event.
     * Ie, all attributes with track information.
     * @return - true if this node has changed state as a result of the time
     * update
     */
    public boolean updateTime(double curTime) throws SVGException
    {
//        if (trackManager.getNumTracks() == 0) return false;

        //Get current values for parameters
        StyleAttribute sty = new StyleAttribute();
        boolean shapeChange = false;

        
        if (getPres(sty.setName("clipPathUnits")))
        {
            String newUnitsStrn = sty.getStringValue();
            int newUnits = newUnitsStrn.equals("objectBoundingBox")
                ? CP_OBJECT_BOUNDING_BOX 
                : CP_USER_SPACE_ON_USE;
                
            if (newUnits != clipPathUnits)
            {
                clipPathUnits = newUnits;
                shapeChange = true;
            }
        }

        if (shapeChange)
        {
            build();
        }

        return shapeChange;
    }
}