/*
* 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.Bounded;
import vash.value.Position;
import vash.value.Wrapping;
public class Flower extends OperationNode {
private static final double MAX_SIZE = 2.5;
private final Position center;
private final Wrapping angle;
private final Bounded size;
private final Bounded ratio;
private final int n_points;
private Flower(Position center, Wrapping angle, Bounded size, Bounded ratio, int n_points) {
super(4, 0);
assert(center.hasBounds(-1, -1, 1, 1));
assert(angle.hasBounds(0, 360));
assert(size.hasBounds(0, MAX_SIZE));
assert(ratio.hasBounds(0, 1));
_values[0] = this.center = center;
_values[1] = this.angle = angle;
_values[2] = this.size = size;
_values[3] = this.ratio = ratio;
this.n_points = n_points;
}
public Flower(double x, double y, double angle, double size, double ratio, int n_points) {
this(new Position(x, y), new Wrapping(angle, 0, 360), new Bounded(size, 0, MAX_SIZE), new Bounded(ratio, 0, 1), n_points);
}
public Flower(Seed s) {
super(4, 0);
_values[0] = this.center = new Position(s);
_values[1] = this.angle = new Wrapping(s, 0, 360);
_values[2] = this.size = new Bounded(s, 0.0, MAX_SIZE);
_values[3] = this.ratio = new Bounded(s, 0.0, 1.0);
this.n_points = (int)(s.nextDouble() * 11.0) + 1;
}
@Override
public OperationNode clone() {
return new Flower(center.clone(), angle.clone(), size.clone(), ratio.clone(), n_points);
}
@Override
public Plane compute(ImageParameters ip) {
Plane out = ip.getPlane();
float[] X = ip.getXValues();
float[] Y = ip.getYValues();
float x = (float)this.center.getX();
float y = (float)this.center.getY();
float angle = (float)this.angle.getV();
float sz = (float)this.size.getV();
float ratio = (float)this.ratio.getV();
float inner = sz * ratio;
// provide manual anti-aliasing
float fringe = X[2] - X[0];
// note: adjust the angle by -PI/2 so 0 is up
float ca = (float)Math.cos((angle * Math.PI / 180.0) - (Math.PI / 2.0));
float sa = (float)Math.sin((angle * Math.PI / 180.0) - (Math.PI / 2.0));
for(int j = 0; j < ip.getH(); j++) {
float y0 = Y[j] - y;
for(int i = 0; i < ip.getW(); i++) {
float x0 = X[i] - x;
// distance from center
float d = (float)Math.sqrt(x0 * x0 + y0 * y0);
// rotate into angle
float x1 = (x0 * ca) - (y0 * sa);
float y1 = (x0 * sa) + (y0 * ca);
if(d < sz * ratio) { // inside
out.data[i][j] = 1.0f;
} else if(d > sz) { // outsize
out.data[i][j] = -1.0f;
} else {
// is the point in an arm?
// the spiky bits are 0 + (n / n_points)
float theta = (float)((Math.atan2(y1, x1) / Math.PI + 1.0) / 2.0); // [0,1] on full circle
float expanded = theta * n_points; // [0,n] on full circle
float offset = expanded - (int)expanded; // [0,1] on each segment
offset = offset * 2.0f - 1.0f; // [-1,1] centered on segment
// the ratio from inner to outer, inverted
float r = ((d - inner) * (1.0f / (sz - inner)));
// inside/outside test is now simply a compare
float dist = r - Math.abs(offset);
if(dist < 0) {
out.data[i][j] = 1.0f;
} else {
if(dist < fringe) {
out.data[i][j] = 1.0f - (2.0f * dist / fringe);
} else {
out.data[i][j] = -1.0f;
}
}
}
}
}
return out;
}
}