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A tool for displaying and playing SVG content using the Java2D
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/*
 * SVG Salamander
 * Copyright (c) 2004, Mark McKay
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or 
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 *   - Redistributions of source code must retain the above 
 *     copyright notice, this list of conditions and the following
 *     disclaimer.
 *   - Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials 
 *     provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE. 
 * 
 * Mark McKay can be contacted at [email protected].  Salamander and other
 * projects can be found at http://www.kitfox.com
 *
 * Created on January 26, 2004, 9:00 AM
 */
package com.kitfox.svg;

import com.kitfox.svg.xml.StyleAttribute;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;

/**
 * Maintains bounding box for this element
 *
 * @author Mark McKay
 * @author Mark McKay
 */
abstract public class TransformableElement extends SVGElement
{
    AffineTransform xform = null;

    /**
     * Creates a new instance of BoundedElement
     */
    public TransformableElement()
    {
    }

    public TransformableElement(String id, SVGElement parent)
    {
        super(id, parent);
    }

    /**
     * Fetches a copy of the cached AffineTransform. Note that this value will
     * only be valid after the node has been updated.
     *
     * @return
     */
    public AffineTransform getXForm()
    {
        return xform == null ? null : new AffineTransform(xform);
    }
    /*
     public void loaderStartElement(SVGLoaderHelper helper, Attributes attrs, SVGElement parent)
     {
     //Load style string
     super.loaderStartElement(helper, attrs, parent);

     String transform = attrs.getValue("transform");
     if (transform != null)
     {
     xform = parseTransform(transform);
     }
     }
     */

    @Override
    protected void build() throws SVGException
    {
        super.build();

        StyleAttribute sty = new StyleAttribute();

        if (getPres(sty.setName("transform")))
        {
            xform = parseTransform(sty.getStringValue());
        }
    }

    protected Shape shapeToParent(Shape shape)
    {
        if (xform == null)
        {
            return shape;
        }
        return xform.createTransformedShape(shape);
    }

    protected Rectangle2D boundsToParent(Rectangle2D rect)
    {
        if (xform == null || rect == null)
        {
            return rect;
        }
        return xform.createTransformedShape(rect).getBounds2D();
    }

    /**
     * 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
     */
    @Override
    public boolean updateTime(double curTime) throws SVGException
    {
        StyleAttribute sty = new StyleAttribute();

        if (getPres(sty.setName("transform")))
        {
            AffineTransform newXform = parseTransform(sty.getStringValue());
            if (!newXform.equals(xform))
            {
                xform = newXform;
                return true;
            }
        }

        return false;
    }
}