/*
JWildfire - an image and animation processor written in Java
Copyright (C) 1995-2011 Andreas Maschke
This 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 software 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 software;
if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jwildfire.create.tina.variation;
import static org.jwildfire.base.mathlib.MathLib.atan2;
import static org.jwildfire.base.mathlib.MathLib.cos;
import static org.jwildfire.base.mathlib.MathLib.sin;
import static org.jwildfire.base.mathlib.MathLib.sqrt;
import org.jwildfire.create.tina.base.Layer;
import org.jwildfire.create.tina.base.XForm;
import org.jwildfire.create.tina.base.XYZPoint;
public class CircusFunc extends VariationFunc {
private static final long serialVersionUID = 1L;
private static final String PARAM_SCALE = "scale";
private static final String[] paramNames = { PARAM_SCALE };
private double scale = 1.0;
@Override
public void transform(FlameTransformationContext pContext, XForm pXForm, XYZPoint pAffineTP, XYZPoint pVarTP, double pAmount) {
/* circus from Michael Faber, http://michaelfaber.deviantart.com/art/The-Lost-Variations-258913970 */
double r = sqrt(pAffineTP.x * pAffineTP.x + pAffineTP.y * pAffineTP.y);
double a = atan2(pAffineTP.y, pAffineTP.x);
double s = sin(a);
double c = cos(a);
if (r <= 1.0)
r *= scale;
else
r *= scale_1;
pVarTP.x += pAmount * r * c;
pVarTP.y += pAmount * r * s;
if (pContext.isPreserveZCoordinate()) {
pVarTP.z += pAmount * pAffineTP.z;
}
}
@Override
public String[] getParameterNames() {
return paramNames;
}
@Override
public Object[] getParameterValues() {
return new Object[] { scale };
}
@Override
public void setParameter(String pName, double pValue) {
if (PARAM_SCALE.equalsIgnoreCase(pName))
scale = pValue;
else
throw new IllegalArgumentException(pName);
}
@Override
public String getName() {
return "circus";
}
private double scale_1;
@Override
public void init(FlameTransformationContext pContext, Layer pLayer, XForm pXForm, double pAmount) {
scale_1 = 1.0 / scale;
}
}