/*
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.EPSILON;
import static org.jwildfire.base.mathlib.MathLib.atan2;
import static org.jwildfire.base.mathlib.MathLib.cos;
import static org.jwildfire.base.mathlib.MathLib.fabs;
import static org.jwildfire.base.mathlib.MathLib.sin;
import org.jwildfire.create.tina.base.XForm;
import org.jwildfire.create.tina.base.XYZPoint;
public class EpispiralFunc extends VariationFunc {
private static final long serialVersionUID = 1L;
private static final String PARAM_N = "n";
private static final String PARAM_THICKNESS = "thickness";
private static final String PARAM_HOLES = "holes";
private static final String[] paramNames = { PARAM_N, PARAM_THICKNESS, PARAM_HOLES };
private double n = 6.0;
private double thickness = 0.0;
private double holes = 1.0;
@Override
public void transform(FlameTransformationContext pContext, XForm pXForm, XYZPoint pAffineTP, XYZPoint pVarTP, double pAmount) {
// epispiral by cyberxaos, http://cyberxaos.deviantart.com/journal/Epispiral-Plugin-240086108
double theta = atan2(pAffineTP.y, pAffineTP.x);
double t = -holes;
if (fabs(thickness) > EPSILON) {
double d = cos(n * theta);
if (d == 0) {
return;
}
t += (pContext.random() * thickness) * (1.0 / d);
}
else {
double d = cos(n * theta);
if (d == 0) {
return;
}
t += 1.0 / d;
}
pVarTP.x += pAmount * t * cos(theta);
pVarTP.y += pAmount * t * sin(theta);
if (pContext.isPreserveZCoordinate()) {
pVarTP.z += pAmount * pAffineTP.z;
}
}
@Override
public String[] getParameterNames() {
return paramNames;
}
@Override
public Object[] getParameterValues() {
return new Object[] { n, thickness, holes };
}
@Override
public void setParameter(String pName, double pValue) {
if (PARAM_N.equalsIgnoreCase(pName))
n = pValue;
else if (PARAM_THICKNESS.equalsIgnoreCase(pName))
thickness = pValue;
else if (PARAM_HOLES.equalsIgnoreCase(pName))
holes = pValue;
else
throw new IllegalArgumentException(pName);
}
@Override
public String getName() {
return "epispiral";
}
}