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/*
* TCSS 491 Computational Worlds
* Author Steve Bradshaw
*/
package tesseract.objects;
import javax.media.j3d.Appearance;
import javax.media.j3d.Group;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.vecmath.Matrix3f;
import com.sun.j3d.utils.geometry.Sphere;
/**
* This class creates an ellipsoid using the formula
* (x/a)^2 + (y/b)^2 + (z/c)^2 = 1 using a matrix3f transformation
* on a basic Sphere. This class sets 'a' to a constant 1.0 and allows
* 'b' and 'c' to alter the ellipsoid's shape along with the radius field
* Sphere. Since this is a sphere, the normals are already calculated.
*
* @author Steve Bradshaw
* @version 1 Feb 2011
*/
public class Ellipsoid extends Sphere {
/**
* The b in the formula (x/a)^2 + (y/b)^2 + (z/c)^2 = 1.
*/
private float my_b;
/**
* The c in the formula (x/a)^2 + (y/b)^2 + (z/c)^2 = 1.
*/
private float my_c;
/**
* The Group containing the new ellipsoid.
*/
private TransformGroup my_ellipsoidTG;
/**
* Constructor similar to sphere but with the additions of b and c to change
* the shape.
* This constructor does not have the Appearance as an argument.
*
* @param radius the radius of the ellipsoid if in sphere form
* @param primflags an int
* @param divisions an int
* @param b to change the shape of the ellipsoid in the y direction
* @param c to change the shape of the ellipsoid in the z direction
*/
public Ellipsoid(final float radius, final int primflags,
final int divisions, final float b, final float c) {
super(radius, primflags, divisions);
my_b = b;
my_c = c;
my_ellipsoidTG = new TransformGroup();
createGeometry();
}
/**
* Constructor similar to sphere but with the additions of b and c to change
* the shape. This constructor adds Appearance as an argument.
*
* @param radius the radius of the ellipsoid if in sphere form
* @param primflags an int
* @param divisions an int
* @param appearance brings an Appearance object for material, color etc.
* @param b to change the shape of the ellipsoid in the y direction
* @param c to change the shape of the ellipsoid in the z direction
*/
public Ellipsoid(final float radius, final int primflags,
final int divisions, final Appearance appearance,
final float b, final float c) {
super(radius, primflags, divisions, appearance);
my_b = b;
my_c = c;
my_ellipsoidTG = new TransformGroup();
createGeometry();
}
/*
* This private method transforms a sphere using a 3D Matrix
*/
private void createGeometry() {
Transform3D tmp = new Transform3D();
tmp.set(new Matrix3f(1.0f, 0.0f, 0.0f, 0.0f, my_b, 0.0f, 0.0f, 0.0f, my_c));
my_ellipsoidTG.setTransform(tmp);
my_ellipsoidTG.addChild(this);
}
/**
* This method is the getter to get custom ellipsoid
*
* @return Group containing the transformation of the sphere
*/
public Group getEllipsoid() {
return my_ellipsoidTG;
}
}
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