/*
* __ .__ .__ ._____.
* _/ |_ _______ __|__| ____ | | |__\_ |__ ______
* \ __\/ _ \ \/ / |/ ___\| | | || __ \ / ___/
* | | ( <_> > <| \ \___| |_| || \_\ \\___ \
* |__| \____/__/\_ \__|\___ >____/__||___ /____ >
* \/ \/ \/ \/
*
* Copyright (c) 2006-2011 Karsten Schmidt
*
* This library 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.
*
* http://creativecommons.org/licenses/LGPL/2.1/
*
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
package toxi.geom.mesh;
import toxi.geom.Sphere;
import toxi.geom.Vec3D;
import toxi.math.MathUtils;
/**
* This implementation of a {@link SurfaceFunction} samples a given
* {@link Sphere} instance when called by the {@link SurfaceMeshBuilder}.
*/
public class SphereFunction implements SurfaceFunction {
public Sphere sphere;
protected float phiRange = MathUtils.PI;
protected float thetaRange = MathUtils.TWO_PI;
public SphereFunction() {
this(1);
}
/**
* Creates a new instance using a sphere of the given radius, located at the
* world origin.
*
* @param radius
*/
public SphereFunction(float radius) {
this(new Sphere(new Vec3D(), radius));
}
/**
* Creates a new instance using the given sphere
*
* @param s
* sphere
*/
public SphereFunction(Sphere s) {
this.sphere = s;
}
public Vec3D computeVertexFor(Vec3D p, float phi, float theta) {
phi -= MathUtils.HALF_PI;
float cosPhi = MathUtils.cos(phi);
float cosTheta = MathUtils.cos(theta);
float sinPhi = MathUtils.sin(phi);
float sinTheta = MathUtils.sin(theta);
float t = MathUtils.sign(cosPhi) * MathUtils.abs(cosPhi);
p.x = t * MathUtils.sign(cosTheta) * MathUtils.abs(cosTheta);
p.y = MathUtils.sign(sinPhi) * MathUtils.abs(sinPhi);
p.z = t * MathUtils.sign(sinTheta) * MathUtils.abs(sinTheta);
return p.scaleSelf(sphere.radius).addSelf(sphere);
}
public float getPhiRange() {
return phiRange;
}
public int getPhiResolutionLimit(int res) {
return res;
}
public float getThetaRange() {
return thetaRange;
}
public int getThetaResolutionLimit(int res) {
return res;
}
public void setMaxPhi(float max) {
phiRange = MathUtils.min(max / 2, MathUtils.PI);
}
public void setMaxTheta(float max) {
thetaRange = MathUtils.min(max, MathUtils.TWO_PI);
}
}