/*
* 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.Graphics2D;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.Area;
import java.awt.geom.NoninvertibleTransformException;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.util.Iterator;
import java.util.List;
/**
* @author Mark McKay
* @author <a href="mailto:mark@kitfox.com">Mark McKay</a>
*/
public class Group extends ShapeElement
{
//Cache bounding box for faster clip testing
Rectangle2D boundingBox;
Shape cachedShape;
//Cache clip bounds
final Rectangle clipBounds = new Rectangle();
/** Creates a new instance of Stop */
public Group() {
}
/*
public void loaderStartElement(SVGLoaderHelper helper, Attributes attrs, SVGElement parent)
{
//Load style string
super.loaderStartElement(helper, attrs, parent);
//String transform = attrs.getValue("transform");
}
*/
/**
* 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);
// members.add(child);
}
protected boolean outsideClip(Graphics2D g) throws SVGException
{
g.getClipBounds(clipBounds);
Rectangle2D rect = getBoundingBox();
//if (rect == null)
//{
// rect = getBoundingBox();
//}
// if (rect.intersects(clipBounds))
if (rect.intersects(clipBounds))
{
return false;
}
return true;
}
void pick(Point2D point, boolean boundingBox, List retVec) throws SVGException
{
Point2D xPoint = new Point2D.Double(point.getX(), point.getY());
if (xform != null)
{
try
{
xform.inverseTransform(point, xPoint);
}
catch (NoninvertibleTransformException ex)
{
throw new SVGException(ex);
}
}
for (Iterator it = children.iterator(); it.hasNext();)
{
SVGElement ele = (SVGElement)it.next();
if (ele instanceof RenderableElement)
{
RenderableElement rendEle = (RenderableElement)ele;
rendEle.pick(xPoint, boundingBox, retVec);
}
}
}
void pick(Rectangle2D pickArea, AffineTransform ltw, boolean boundingBox, List retVec) throws SVGException
{
if (xform != null)
{
ltw = new AffineTransform(ltw);
ltw.concatenate(xform);
}
for (Iterator it = children.iterator(); it.hasNext();)
{
SVGElement ele = (SVGElement)it.next();
if (ele instanceof RenderableElement)
{
RenderableElement rendEle = (RenderableElement)ele;
rendEle.pick(pickArea, ltw, boundingBox, retVec);
}
}
}
public void render(Graphics2D g) throws SVGException
{
//Don't process if not visible
StyleAttribute styleAttrib = new StyleAttribute();
if (getStyle(styleAttrib.setName("visibility")))
{
if (!styleAttrib.getStringValue().equals("visible")) return;
}
//Do not process offscreen groups
boolean ignoreClip = diagram.ignoringClipHeuristic();
if (!ignoreClip && outsideClip(g)) return;
beginLayer(g);
Iterator it = children.iterator();
try
{
g.getClipBounds(clipBounds);
}
catch (Exception e)
{
//For some reason, getClipBounds can throw a null pointer exception for
// some types of Graphics2D
ignoreClip = true;
}
while (it.hasNext())
{
SVGElement ele = (SVGElement)it.next();
if (ele instanceof RenderableElement)
{
RenderableElement rendEle = (RenderableElement)ele;
// if (shapeEle == null) continue;
if (!(ele instanceof Group))
{
//Skip if clipping area is outside our bounds
if (!ignoreClip && !rendEle.getBoundingBox().intersects(clipBounds))
{
continue;
}
}
rendEle.render(g);
}
}
finishLayer(g);
}
/**
* Retrieves the cached bounding box of this group
*/
public Shape getShape()
{
if (cachedShape == null) calcShape();
return cachedShape;
}
public void calcShape()
{
Area retShape = new Area();
for (Iterator it = children.iterator(); it.hasNext();)
{
SVGElement ele = (SVGElement)it.next();
if (ele instanceof ShapeElement)
{
ShapeElement shpEle = (ShapeElement)ele;
Shape shape = shpEle.getShape();
if (shape != null)
{
retShape.add(new Area(shape));
}
}
}
cachedShape = shapeToParent(retShape);
}
/**
* Retrieves the cached bounding box of this group
*/
public Rectangle2D getBoundingBox() throws SVGException
{
if (boundingBox == null) calcBoundingBox();
// calcBoundingBox();
return boundingBox;
}
/**
* Recalculates the bounding box by taking the union of the bounding boxes
* of all children. Caches the result.
*/
public void calcBoundingBox() throws SVGException
{
// Rectangle2D retRect = new Rectangle2D.Float();
Rectangle2D retRect = null;
for (Iterator it = children.iterator(); it.hasNext();)
{
SVGElement ele = (SVGElement)it.next();
if (ele instanceof RenderableElement)
{
RenderableElement rendEle = (RenderableElement)ele;
Rectangle2D bounds = rendEle.getBoundingBox();
if (bounds != null)
{
if (retRect == null) retRect = bounds;
else retRect = retRect.createUnion(bounds);
}
}
}
// if (xform != null)
// {
// retRect = xform.createTransformedShape(retRect).getBounds2D();
// }
//If no contents, use degenerate rectangle
if (retRect == null) retRect = new Rectangle2D.Float();
boundingBox = boundsToParent(retRect);
}
public boolean updateTime(double curTime) throws SVGException
{
boolean changeState = super.updateTime(curTime);
Iterator it = children.iterator();
//Distribute message to all members of this group
while (it.hasNext())
{
SVGElement ele = (SVGElement)it.next();
boolean updateVal = ele.updateTime(curTime);
changeState = changeState || updateVal;
//Update our shape if shape aware children change
if (ele instanceof ShapeElement) cachedShape = null;
if (ele instanceof RenderableElement) boundingBox = null;
}
return changeState;
}
}
