/*
 * LinearGradient.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, 1:54 AM
 */

package com.kitfox.svg;

import com.kitfox.svg.xml.StyleAttribute;
import com.kitfox.svg.xml.*;
import org.xml.sax.*;

import java.net.*;
import java.awt.*;
import java.awt.geom.*;

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

    float x = 0f;
    float y = 0f;
    float width = 1f;
    float height = 1f;

    SVGElement href = null;

    AffineTransform refXform;

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

        String x = attrs.getValue("x");
        String y = attrs.getValue("y");
        String width = attrs.getValue("width");
        String height = attrs.getValue("height");
        String href = attrs.getValue("xlink:href");

        if (x != null) this.x = (float)XMLParseUtil.parseRatio(x);
        if (y != null) this.y = (float)XMLParseUtil.parseRatio(y);
        if (width != null) this.width = (float)XMLParseUtil.parseRatio(width);
        if (height != null) this.height = (float)XMLParseUtil.parseRatio(height);


        if (href != null)
        {
            try {
                URI src = getXMLBase().resolve(href);
                this.href = helper.universe.getElement(src);
            }
            catch (Exception e)
            {
                e.printStackTrace();
            }
        }

        //Determine use offset/scale
        refXform = new AffineTransform();
        refXform.translate(this.x, this.y);
        refXform.scale(this.width, this.height);
    }
*/
    protected void build() throws SVGException
    {
        super.build();
        
        StyleAttribute sty = new StyleAttribute();
        
        if (getPres(sty.setName("x"))) x = sty.getFloatValueWithUnits();

        if (getPres(sty.setName("y"))) y = sty.getFloatValueWithUnits();

        if (getPres(sty.setName("width"))) width = sty.getFloatValueWithUnits();

        if (getPres(sty.setName("height"))) height = sty.getFloatValueWithUnits();

        if (getPres(sty.setName("xlink:href")))
        {
            URI src = sty.getURIValue(getXMLBase());
            href = diagram.getUniverse().getElement(src);
        }
        
        //Determine use offset/scale
        refXform = new AffineTransform();
        refXform.translate(this.x, this.y);
    }
    
    public void render(Graphics2D g) throws SVGException
    {
        beginLayer(g);

        //AffineTransform oldXform = g.getTransform();
        AffineTransform oldXform = g.getTransform();
        g.transform(refXform);

        if (href == null || !(href instanceof RenderableElement)) return;

        ((RenderableElement)href).render(g);

        g.setTransform(oldXform);

        finishLayer(g);
    }

    public Shape getShape()
    {
        if (href instanceof ShapeElement)
        {
            Shape shape = ((ShapeElement)href).getShape();
            shape = refXform.createTransformedShape(shape);
            shape = shapeToParent(shape);
            return shape;
        }

        return null;
    }

    public Rectangle2D getBoundingBox() throws SVGException
    {
        if (href instanceof ShapeElement)
        {
            Rectangle2D bounds = ((ShapeElement)href).getBoundingBox();
            bounds = refXform.createTransformedShape(bounds).getBounds2D();
            bounds = boundsToParent(bounds);

            return bounds;
        }

        return null;
    }

    /**
     * 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;
        boolean changeState = super.updateTime(curTime);

        //Get current values for parameters
        StyleAttribute sty = new StyleAttribute();
        boolean shapeChange = false;
        
        if (getPres(sty.setName("x")))
        {
            float newVal = sty.getFloatValueWithUnits();
            if (newVal != x)
            {
                x = newVal;
                shapeChange = true;
            }
        }

        if (getPres(sty.setName("y")))
        {
            float newVal = sty.getFloatValueWithUnits();
            if (newVal != y)
            {
                y = newVal;
                shapeChange = true;
            }
        }

        if (getPres(sty.setName("width")))
        {
            float newVal = sty.getFloatValueWithUnits();
            if (newVal != width)
            {
                width = newVal;
                shapeChange = true;
            }
        }

        if (getPres(sty.setName("height")))
        {
            float newVal = sty.getFloatValueWithUnits();
            if (newVal != height)
            {
                height = newVal;
                shapeChange = true;
            }
        }
        
        if (getPres(sty.setName("xlink:href")))
        {
            URI src = sty.getURIValue(getXMLBase());
            SVGElement newVal = diagram.getUniverse().getElement(src);
            if (newVal != href)
            {
                href = newVal;
                shapeChange = true;
            }
        }
/*
        if (getPres(sty.setName("xlink:href")))
        {
            URI src = sty.getURIValue(getXMLBase());
            href = diagram.getUniverse().getElement(src);
        }
        
        //Determine use offset/scale
        refXform = new AffineTransform();
        refXform.translate(this.x, this.y);
        refXform.scale(this.width, this.height);
*/        
        if (shapeChange)
        {
            //Determine use offset/scale
            refXform.setToTranslation(this.x, this.y);
            refXform.scale(this.width, this.height);
            return true;
        }
        
        return changeState;
    }
}
