/*
* Copyright 2011, Zettabyte Storage LLC
*
* This file is part of Vash.
*
* Vash is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Vash 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Vash. If not, see <http://www.gnu.org/licenses/>.
*/
package vash.operation;
import vash.ImageParameters;
import vash.Plane;
import vash.Seed;
import vash.value.Position;
import vash.value.Wrapping;
public class PolarTheta extends OperationNode {
private final Position center;
private final Wrapping angle;
private PolarTheta(Position center, Wrapping angle) {
super(2, 0);
assert(this.center.hasBounds(-1, -1, 1, 1));
assert(this.angle.hasBounds(-1, 1));
_values[0] = this.center = center;
_values[1] = this.angle = angle;
}
public PolarTheta(double x, double y, double angle) {
this(new Position(x, y), new Wrapping(angle, -1, 1));
}
public PolarTheta(Seed s) {
super(2, 0);
_values[0] = this.center = new Position(s);
_values[1] = this.angle = new Wrapping(s, -1, 1);
}
@Override
public OperationNode clone() {
return new PolarTheta(center.clone(), angle.clone());
}
@Override
public Plane compute(ImageParameters ip) {
float x0, y0, x1, y1;
float angle = (float)(this.angle.getV());
float ca = (float)Math.cos(angle * Math.PI);
float sa = (float)Math.sin(angle * Math.PI);
float x = (float)this.center.getX();
float y = (float)this.center.getY();
float[] X = ip.getXValues();
float[] Y = ip.getYValues();
float w = ip.getW();
float h = ip.getH();
Plane out = ip.getPlane();
for(int j = 0; j < h; j++) {
y0 = Y[j] - y;
for(int i = 0; i < w; i++) {
x0 = X[i] - x;
x1 = (x0 * ca) - (y0 * sa);
y1 = (x0 * sa) + (y0 * ca);
out.data[i][j] = (float)(Math.atan2(y1, x1) / Math.PI);
}
}
return out;
}
}