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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 mark@kitfox.com. 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.xml.XMLParseUtil;
import org.xml.sax.*;
import java.awt.geom.*;
import com.kitfox.svg.*;
import com.kitfox.svg.xml.*;
import java.util.regex.Pattern;
/**
* @author Mark McKay
* @author <a href="mailto:mark@kitfox.com">Mark McKay</a>
*/
public class AnimateTransform extends AnimateXform
{
// protected AffineTransform fromValue;
// protected AffineTransform toValue;
// protected double[] fromValue; //Transform parameters
// protected double[] toValue;
protected double[][] values;
protected double[] keyTimes;
public static final int AT_REPLACE = 0;
public static final int AT_SUM = 1;
protected int additive = AT_REPLACE;
public static final int TR_TRANSLATE = 0;
public static final int TR_ROTATE = 1;
public static final int TR_SCALE = 2;
public static final int TR_SKEWY = 3;
public static final int TR_SKEWX = 4;
public static final int TR_INVALID = 5;
protected int xformType = TR_INVALID;
/** Creates a new instance of Animate */
public AnimateTransform()
{
}
public void loaderStartElement(SVGLoaderHelper helper, Attributes attrs, SVGElement parent) throws SAXException
{
//Load style string
super.loaderStartElement(helper, attrs, parent);
//Type of matrix of transform. Should be one of the known names used to
// define matrix transforms
// valid types: translate, scale, rotate, skewX, skewY
// 'matrix' not valid for animation
String type = attrs.getValue("type").toLowerCase();
if (type.equals("translate")) xformType = TR_TRANSLATE;
if (type.equals("rotate")) xformType = TR_ROTATE;
if (type.equals("scale")) xformType = TR_SCALE;
if (type.equals("skewx")) xformType = TR_SKEWX;
if (type.equals("skewy")) xformType = TR_SKEWY;
String fromStrn = attrs.getValue("from");
String toStrn = attrs.getValue("to");
if (fromStrn != null && toStrn != null)
{
//fromValue = parseSingleTransform(type + "(" + strn + ")");
double[] fromValue = XMLParseUtil.parseDoubleList(fromStrn);
fromValue = validate(fromValue);
// toValue = parseSingleTransform(type + "(" + strn + ")");
double[] toValue = XMLParseUtil.parseDoubleList(toStrn);
toValue = validate(toValue);
values = new double[][]{fromValue, toValue};
keyTimes = new double[]{0, 1};
}
String keyTimeStrn = attrs.getValue("keyTimes");
String valuesStrn = attrs.getValue("values");
if (keyTimeStrn != null && valuesStrn != null)
{
keyTimes = XMLParseUtil.parseDoubleList(keyTimeStrn);
String[] valueList = Pattern.compile(";").split(valuesStrn);
values = new double[valueList.length][];
for (int i = 0; i < valueList.length; i++)
{
double[] list = XMLParseUtil.parseDoubleList(valueList[i]);
values[i] = validate(list);
}
}
//Check our additive state
String additive = attrs.getValue("additive");
if (additive != null)
{
if (additive.equals("sum")) this.additive = AT_SUM;
}
}
/**
* Check list size against current xform type and ensure list
* is expanded to a standard list size
*/
private double[] validate(double[] paramList)
{
switch (xformType)
{
case TR_SCALE:
{
if (paramList == null)
{
paramList = new double[]{1, 1};
}
else if (paramList.length == 1)
{
paramList = new double[]{paramList[0], paramList[0]};
// double[] tmp = paramList;
// paramList = new double[2];
// paramList[0] = paramList[1] = tmp[0];
}
}
}
return paramList;
}
/**
* Evaluates this animation element for the passed interpolation time. Interp
* must be on [0..1].
*/
public AffineTransform eval(AffineTransform xform, double interp)
{
int idx = 0;
for (; idx < keyTimes.length - 1; idx++)
{
if (interp >= keyTimes[idx])
{
idx--;
if (idx < 0) idx = 0;
break;
}
}
double spanStartTime = keyTimes[idx];
double spanEndTime = keyTimes[idx + 1];
// double span = spanStartTime - spanEndTime;
interp = (interp - spanStartTime) / (spanEndTime - spanStartTime);
double[] fromValue = values[idx];
double[] toValue = values[idx + 1];
switch (xformType)
{
case TR_TRANSLATE:
{
double x = (1.0 - interp) * fromValue[0] + interp * toValue[0];
double y = (1.0 - interp) * fromValue[1] + interp * toValue[1];
xform.setToTranslation(x, y);
break;
}
case TR_ROTATE:
{
double x1 = fromValue.length == 3 ? fromValue[1] : 0;
double y1 = fromValue.length == 3 ? fromValue[2] : 0;
double x2 = toValue.length == 3 ? toValue[1] : 0;
double y2 = toValue.length == 3 ? toValue[2] : 0;
double theta = (1.0 - interp) * fromValue[0] + interp * toValue[0];
double x = (1.0 - interp) * x1 + interp * x2;
double y = (1.0 - interp) * y1 + interp * y2;
xform.setToRotation(Math.toRadians(theta), x, y);
break;
}
case TR_SCALE:
{
double x = (1.0 - interp) * fromValue[0] + interp * toValue[0];
double y = (1.0 - interp) * fromValue[1] + interp * toValue[1];
xform.setToScale(x, y);
break;
}
case TR_SKEWX:
{
double x = (1.0 - interp) * fromValue[0] + interp * toValue[0];
xform.setToShear(Math.toRadians(x), 0.0);
break;
}
case TR_SKEWY:
{
double y = (1.0 - interp) * fromValue[0] + interp * toValue[0];
xform.setToShear(0.0, Math.toRadians(y));
break;
}
default:
xform.setToIdentity();
break;
}
return xform;
}
}
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