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SVG Salamander - tools and components for SVG rendering, manipulation and animation
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/*
* Animate.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 [email protected]. Salamander and other
* projects can be found at http://www.kitfox.com
*
* Created on August 15, 2004, 2:51 AM
*/
package com.kitfox.svg.animation;
import com.kitfox.svg.SVGElement;
import com.kitfox.svg.SVGException;
import com.kitfox.svg.SVGLoaderHelper;
import com.kitfox.svg.animation.parser.AnimTimeParser;
import com.kitfox.svg.xml.StyleAttribute;
import java.awt.geom.AffineTransform;
import java.awt.geom.GeneralPath;
import java.awt.geom.PathIterator;
import java.awt.geom.Point2D;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
/**
* @author Mark McKay
* @author Mark McKay
*/
public class AnimateMotion extends AnimateXform
{
static final Matcher matchPoint = Pattern.compile("\\s*(\\d+)[^\\d]+(\\d+)\\s*").matcher("");
// protected double fromValue;
// protected double toValue;
GeneralPath path;
int rotateType = RT_ANGLE;
double rotate; //Static angle to rotate by
public static final int RT_ANGLE = 0; //Rotate by constant 'rotate' degrees
public static final int RT_AUTO = 1; //Rotate to reflect tangent of position on path
final ArrayList bezierSegs = new ArrayList();
double curveLength;
/** Creates a new instance of Animate */
public AnimateMotion()
{
}
public void loaderStartElement(SVGLoaderHelper helper, Attributes attrs, SVGElement parent) throws SAXException
{
//Load style string
super.loaderStartElement(helper, attrs, parent);
//Motion element implies animating the transform element
if (attribName == null)
{
attribName = "transform";
attribType = AT_AUTO;
additiveType = AD_SUM;
}
String path = attrs.getValue("path");
if (path != null)
{
this.path = buildPath(path, GeneralPath.WIND_NON_ZERO);
}
//Now parse rotation style
String rotate = attrs.getValue("rotate");
if (rotate != null)
{
if (rotate.equals("auto"))
{
this.rotateType = RT_AUTO;
}
else
{
try { this.rotate = Math.toRadians(Float.parseFloat(rotate)); } catch (Exception e) {}
}
}
//Determine path
String from = attrs.getValue("from");
String to = attrs.getValue("to");
buildPath(from, to);
}
protected static void setPoint(Point2D.Float pt, String x, String y)
{
try { pt.x = Float.parseFloat(x); } catch (Exception e) {};
try { pt.y = Float.parseFloat(y); } catch (Exception e) {};
}
private void buildPath(String from, String to)
{
if (from != null && to != null)
{
Point2D.Float ptFrom = new Point2D.Float(), ptTo = new Point2D.Float();
matchPoint.reset(from);
if (matchPoint.matches())
{
setPoint(ptFrom, matchPoint.group(1), matchPoint.group(2));
}
matchPoint.reset(to);
if (matchPoint.matches())
{
setPoint(ptFrom, matchPoint.group(1), matchPoint.group(2));
}
if (ptFrom != null && ptTo != null)
{
path = new GeneralPath();
path.moveTo(ptFrom.x, ptFrom.y);
path.lineTo(ptTo.x, ptTo.y);
}
}
paramaterizePath();
}
private void paramaterizePath()
{
bezierSegs.clear();
curveLength = 0;
double[] coords = new double[6];
double sx = 0, sy = 0;
for (PathIterator pathIt = path.getPathIterator(new AffineTransform()); !pathIt.isDone(); pathIt.next())
{
Bezier bezier = null;
int segType = pathIt.currentSegment(coords);
switch (segType)
{
case PathIterator.SEG_LINETO:
{
bezier = new Bezier(sx, sy, coords, 1);
sx = coords[0];
sy = coords[1];
break;
}
case PathIterator.SEG_QUADTO:
{
bezier = new Bezier(sx, sy, coords, 2);
sx = coords[2];
sy = coords[3];
break;
}
case PathIterator.SEG_CUBICTO:
{
bezier = new Bezier(sx, sy, coords, 3);
sx = coords[4];
sy = coords[5];
break;
}
case PathIterator.SEG_MOVETO:
{
sx = coords[0];
sy = coords[1];
break;
}
case PathIterator.SEG_CLOSE:
//Do nothing
break;
}
if (bezier != null)
{
bezierSegs.add(bezier);
curveLength += bezier.getLength();
}
}
}
/**
* Evaluates this animation element for the passed interpolation time. Interp
* must be on [0..1].
*/
public AffineTransform eval(AffineTransform xform, double interp)
{
Point2D.Double point = new Point2D.Double();
if (interp >= 1)
{
Bezier last = (Bezier)bezierSegs.get(bezierSegs.size() - 1);
last.getFinalPoint(point);
xform.setToTranslation(point.x, point.y);
return xform;
}
double curLength = curveLength * interp;
for (Iterator it = bezierSegs.iterator(); it.hasNext();)
{
Bezier bez = (Bezier)it.next();
double bezLength = bez.getLength();
if (curLength < bezLength)
{
double param = curLength / bezLength;
bez.eval(param, point);
break;
}
curLength -= bezLength;
}
xform.setToTranslation(point.x, point.y);
return xform;
}
protected void rebuild(AnimTimeParser animTimeParser) throws SVGException
{
super.rebuild(animTimeParser);
StyleAttribute sty = new StyleAttribute();
if (getPres(sty.setName("path")))
{
String strn = sty.getStringValue();
this.path = buildPath(strn, GeneralPath.WIND_NON_ZERO);
}
if (getPres(sty.setName("rotate")))
{
String strn = sty.getStringValue();
if (strn.equals("auto"))
{
this.rotateType = RT_AUTO;
}
else
{
try { this.rotate = Math.toRadians(Float.parseFloat(strn)); } catch (Exception e) {}
}
}
String from = null;
if (getPres(sty.setName("from")))
{
from = sty.getStringValue();
}
String to = null;
if (getPres(sty.setName("to")))
{
to = sty.getStringValue();
}
buildPath(from, to);
}
}