126 lines
3.1 KiB
Java
126 lines
3.1 KiB
Java
/**
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* @author: cdehais
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*/
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package algebra;
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import java.lang.Math;
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public class Vector3 extends Vector {
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public Vector3(double x, double y, double z) {
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super();
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try {
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allocValues(3);
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} catch (java.lang.InstantiationException e) {
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/* unreached */
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}
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this.values[0] = x;
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this.values[1] = y;
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this.values[2] = z;
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}
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public Vector3() {
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this(0.0, 0.0, 0.0);
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}
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public Vector3(String name) {
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this(0.0, 0.0, 0.0);
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this.setName(name);
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}
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/**
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* Creates a new named 3D vector with coordinates (x, y, z).
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*/
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public Vector3(String name, double x, double y, double z) {
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super();
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try {
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allocValues(4);
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} catch (java.lang.InstantiationException e) {
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/* unreached */
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}
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this.values[0] = x;
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this.values[1] = y;
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this.values[2] = z;
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}
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/**
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* Copy constructor from a Vector of size 3 or 4.
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* For a vector of size 4, divide the 3 first coordinates by the fourth.
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*/
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public Vector3(Vector v) throws InstantiationException {
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this();
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if ((v.size != 3) && (v.size != 4)) {
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throw new InstantiationException("Can only build 3D vector from vector of size 3 or 4");
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}
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if (v.size == 3) {
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set(v.get(0), v.get(1), v.get(2));
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} else {
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double w = v.get(3);
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set(v.get(0) / w, v.get(1) / w, v.get(2) / w);
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}
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}
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/**
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* Makes the x, y, and z coordinates of the Vector3 cartesian, by dividing them
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* by
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* the homogeneous coordinate w.
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*/
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public void makeCartesian() throws java.lang.ArithmeticException {
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this.values[0] /= this.values[3];
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this.values[1] /= this.values[3];
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this.values[2] /= this.values[3];
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this.values[3] = 1.0;
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}
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public void set(double x, double y, double z) {
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this.values[0] = x;
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this.values[1] = y;
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this.values[2] = z;
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}
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/**
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* Computes the cross product between the Vector3 and the given vector.
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*/
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public Vector3 cross(Vector3 v) {
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double rx = this.getY() * v.getZ() - this.getZ() * v.getY();
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double ry = this.getZ() * v.getX() - this.getX() * v.getZ();
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double rz = this.getX() * v.getY() - this.getY() * v.getX();
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return new Vector3(rx, ry, rz);
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}
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public double dot(Vector3 v) {
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double r = 0.0;
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return (values[0] * v.values[0] + values[1] * v.values[1] + values[2] * v.values[2]);
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}
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public double norm() {
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double r = (values[0] * values[0] + values[1] * values[1] + values[2] * values[2]);
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return Math.sqrt(r);
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}
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/**
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* Gets the x coordinates of the Vector3
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*/
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public double getX() {
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return this.values[0];
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}
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/**
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* Gets the w coordinates of the Vector3
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*/
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public double getY() {
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return this.values[1];
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}
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/**
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* Gets the w coordinates of the Vector3
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*/
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public double getZ() {
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return this.values[2];
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}
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}
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