fop/src/org/apache/fop/dom/svg/GraphicElement.java

/*-- $Id$ -- 

 ============================================================================
                   The Apache Software License, Version 1.1
 ============================================================================
 
    Copyright (C) 1999 The Apache Software Foundation. All rights reserved.
 
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    this list of conditions and the following disclaimer.
 
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    include  the following  acknowledgment:  "This product includes  software
    developed  by the  Apache Software Foundation  (http://www.apache.org/)."
    Alternately, this  acknowledgment may  appear in the software itself,  if
    and wherever such third-party acknowledgments normally appear.
 
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 This software  consists of voluntary contributions made  by many individuals
 on  behalf of the Apache Software  Foundation and was  originally created by
 James Tauber <jtauber@jtauber.com>. For more  information on the Apache 
 Software Foundation, please see <http://www.apache.org/>.
 
 */
package org.apache.fop.dom.svg;

import java.util.Enumeration;

import org.apache.fop.datatypes.*;

import org.w3c.dom.svg.*;
import org.w3c.dom.*;
import org.w3c.dom.events.*;

/**
 * base class for SVG graphic objects.
 *
 * Graphic objects include rectangles, lines and text
 *
 */
public abstract class GraphicElement extends SVGElementImpl implements SVGTransformable, SVGLangSpace, SVGTests, EventTarget {
	protected SVGList reqFeatures;
	protected SVGList reqExtensions;
	protected SVGList sysLanguage;
	SVGAnimatedTransformList transform;
	String xmlspace = "default";

	public SVGElement getNearestViewportElement( )
	{
		return null;
	}

	public SVGElement getFarthestViewportElement( )
	{
		return null;
	}

	public SVGAnimatedTransformList getTransform()
	{
		if(transform != null) {
			return transform;
		}
		SVGTransformList stl = new SVGTransformListImpl();
		SVGTransform transform = new SVGTransformImpl();
		stl.appendItem(transform);
		SVGAnimatedTransformList atl = new SVGAnimatedTransformListImpl();
		atl.setBaseVal(stl);
		return atl;
	}

	public void setTransform(SVGAnimatedTransformList transform)
	{
		this.transform = transform;
	}

	public SVGRect getBBox()
	{
		return null;
	}

	public SVGMatrix getCTM()
	{
		return null;
	}

	public SVGMatrix getScreenCTM()
	{
		return null;
	}

	public SVGMatrix getTransformToElement(SVGElement element)
									throws SVGException
	{
		return null;
	}

	public String getXMLlang()
	{
		return null;
	}

	public void setXMLlang(String xmllang)
	{
	}

	public String getXMLspace()
	{
		return xmlspace;
	}

	public void setXMLspace(String xmlspace)
	{
		this.xmlspace = xmlspace;
	}

	public SVGList getRequiredFeatures( )
	{
		return reqFeatures;
	}

	public void setRequiredFeatures( SVGList requiredFeatures )
                       throws DOMException
	{
	    reqFeatures = requiredFeatures;
	}

	public SVGList getRequiredExtensions( )
	{
		return reqExtensions;
	}

	public void setRequiredExtensions( SVGList requiredExtensions )
                       throws DOMException
	{
	    reqExtensions = requiredExtensions;
	}

	public boolean hasExtension ( String extension )
	{
		return false;
	}

	public SVGList getSystemLanguage()
	{
		return sysLanguage;
	}

	public void setSystemLanguage(SVGList systemLanguage)
	{
	    sysLanguage = systemLanguage;
	}

	public void addEventListener(String type, 
										EventListener listener, 
										boolean useCapture)
	{
	}

	public void removeEventListener(String type, 
									EventListener listener, 
									boolean useCapture)
	{
	}

	public boolean dispatchEvent(Event evt)
//								throws EventException
	{
		return false;
	}

	/**
	 * Convenience method for implementations of SVGTransformable
	 * that have children that represents the bounding box
	 */
	protected SVGRect getChildrenBBox()
	{
		float minX = 10000000; // a big number
		float maxX = -10000000; // a low number
		float minY = 10000000; // a big number
		float maxY = -10000000; // a low number
		NodeList nl = getChildNodes();
		// can width and height be negative??
		for(int count = 0; count < nl.getLength(); count++) {
			Node n = nl.item(count);
			if(n instanceof SVGTransformable) {
				SVGRect r = ((SVGTransformable)n).getBBox();
				if(r != null) {
					if(minX > r.getX())
					    minX = r.getX();
					if(minY > r.getY())
					    minY = r.getY();
					if(maxX < r.getX() + r.getWidth())
					    maxX = r.getX() + r.getWidth();
					if(maxY > r.getY() + r.getHeight())
					    maxY = r.getY() + r.getHeight();
				}
			}
		}
		SVGRect rect = new SVGRectImpl();
		rect.setX(minX);
		rect.setY(minY);
		rect.setWidth(maxX - minX);
		rect.setHeight(maxY - minY);
		return rect;
	}
}