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A tool for displaying and playing SVG content using the Java2D.
/*
* 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 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.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
{
public static final String TAG_NAME = "animateMotion";
static final Matcher matchPoint = Pattern.compile("\\s*(\\d+)[^\\d]+(\\d+)\\s*").matcher("");
// protected double fromValue;
// protected double toValue;
private GeneralPath path;
private int rotateType = RT_ANGLE;
private 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()
{
}
@Override
public String getTagName()
{
return TAG_NAME;
}
@Override
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;
setAdditiveType(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].
*/
@Override
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 (Bezier bez : bezierSegs) {
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;
}
@Override
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);
}
/**
* @return the path
*/
public GeneralPath getPath()
{
return path;
}
/**
* @param path the path to set
*/
public void setPath(GeneralPath path)
{
this.path = path;
}
/**
* @return the rotateType
*/
public int getRotateType()
{
return rotateType;
}
/**
* @param rotateType the rotateType to set
*/
public void setRotateType(int rotateType)
{
this.rotateType = rotateType;
}
/**
* @return the rotate
*/
public double getRotate()
{
return rotate;
}
/**
* @param rotate the rotate to set
*/
public void setRotate(double rotate)
{
this.rotate = rotate;
}
}