/* Poly2Tri
* Copyright (c) 2009-2010, Poly2Tri Contributors
* http://code.google.com/p/poly2tri/
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of Poly2Tri nor the names of its contributors may be
* used to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.poly2tri.triangulation.util;
import org.poly2tri.geometry.polygon.Polygon;
import org.poly2tri.geometry.polygon.PolygonPoint;
public class PolygonGenerator {
private static final double PI_2 = 2.0 * Math.PI;
public static Polygon RandomCircleSweep(double scale, int vertexCount) {
PolygonPoint point;
PolygonPoint[] points;
double radius = scale / 4;
points = new PolygonPoint[vertexCount];
for (int i = 0; i < vertexCount; i++) {
do {
if (i % 250 == 0) {
radius += scale / 2 * (0.5 - Math.random());
} else if (i % 50 == 0) {
radius += scale / 5 * (0.5 - Math.random());
} else {
radius += 25 * scale / vertexCount * (0.5 - Math.random());
}
radius = radius > scale / 2 ? scale / 2 : radius;
radius = radius < scale / 10 ? scale / 10 : radius;
} while (radius < scale / 10 || radius > scale / 2);
point = new PolygonPoint(radius
* Math.cos((PI_2 * i) / vertexCount), radius
* Math.sin((PI_2 * i) / vertexCount));
points[i] = point;
}
return new Polygon(points);
}
public static Polygon RandomCircleSweep2(double scale, int vertexCount) {
PolygonPoint point;
PolygonPoint[] points;
double radius = scale / 4;
points = new PolygonPoint[vertexCount];
for (int i = 0; i < vertexCount; i++) {
do {
radius += scale / 5 * (0.5 - Math.random());
radius = radius > scale / 2 ? scale / 2 : radius;
radius = radius < scale / 10 ? scale / 10 : radius;
} while (radius < scale / 10 || radius > scale / 2);
point = new PolygonPoint(radius
* Math.cos((PI_2 * i) / vertexCount), radius
* Math.sin((PI_2 * i) / vertexCount));
points[i] = point;
}
return new Polygon(points);
}
}