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/*
* gleem -- OpenGL Extremely Easy-To-Use Manipulators.
* Copyright (C) 1998-2003 Kenneth B. Russell (kbrussel@alum.mit.edu)
* See the file GLEEM-LICENSE.txt in the doc/ directory for licensing terms.
*/
package gleem.linalg;
/** 3-element double-precision vector */
public class Vec3d {
private double x;
private double y;
private double z;
public Vec3d() {}
public Vec3d(Vec3d arg) {
set(arg);
}
public Vec3d(double x, double y, double z) {
set(x, y, z);
}
public Vec3d copy() {
return new Vec3d(this);
}
/** Convert to single-precision */
public Vec3f toFloat() {
return new Vec3f((float) x, (float) y, (float) z);
}
public void set(Vec3d arg) {
set(arg.x, arg.y, arg.z);
}
public void set(double x, double y, double z) {
this.x = x;
this.y = y;
this.z = z;
}
/** Sets the ith component, 0 <= i < 3 */
public void set(int i, double val) {
switch (i) {
case 0: x = val; break;
case 1: y = val; break;
case 2: z = val; break;
default: throw new IndexOutOfBoundsException();
}
}
/** Gets the ith component, 0 <= i < 3 */
public double get(int i) {
switch (i) {
case 0: return x;
case 1: return y;
case 2: return z;
default: throw new IndexOutOfBoundsException();
}
}
public double x() { return x; }
public double y() { return y; }
public double z() { return z; }
public void setX(double x) { this.x = x; }
public void setY(double y) { this.y = y; }
public void setZ(double z) { this.z = z; }
public double dot(Vec3d arg) {
return x * arg.x + y * arg.y + z * arg.z;
}
public double length() {
return Math.sqrt(lengthSquared());
}
public double lengthSquared() {
return this.dot(this);
}
public void normalize() {
double len = length();
if (len == 0.0) return;
scale(1.0f / len);
}
/** Returns this * val; creates new vector */
public Vec3d times(double val) {
Vec3d tmp = new Vec3d(this);
tmp.scale(val);
return tmp;
}
/** this = this * val */
public void scale(double val) {
x *= val;
y *= val;
z *= val;
}
/** Returns this + arg; creates new vector */
public Vec3d plus(Vec3d arg) {
Vec3d tmp = new Vec3d();
tmp.add(this, arg);
return tmp;
}
/** this = this + b */
public void add(Vec3d b) {
add(this, b);
}
/** this = a + b */
public void add(Vec3d a, Vec3d b) {
x = a.x + b.x;
y = a.y + b.y;
z = a.z + b.z;
}
/** Returns this + s * arg; creates new vector */
public Vec3d addScaled(double s, Vec3d arg) {
Vec3d tmp = new Vec3d();
tmp.addScaled(this, s, arg);
return tmp;
}
/** this = a + s * b */
public void addScaled(Vec3d a, double s, Vec3d b) {
x = a.x + s * b.x;
y = a.y + s * b.y;
z = a.z + s * b.z;
}
/** Returns this - arg; creates new vector */
public Vec3d minus(Vec3d arg) {
Vec3d tmp = new Vec3d();
tmp.sub(this, arg);
return tmp;
}
/** this = this - b */
public void sub(Vec3d b) {
sub(this, b);
}
/** this = a - b */
public void sub(Vec3d a, Vec3d b) {
x = a.x - b.x;
y = a.y - b.y;
z = a.z - b.z;
}
/** Returns this cross arg; creates new vector */
public Vec3d cross(Vec3d arg) {
Vec3d tmp = new Vec3d();
tmp.cross(this, arg);
return tmp;
}
/** this = a cross b. NOTE: "this" must be a different vector than
both a and b. */
public void cross(Vec3d a, Vec3d b) {
x = a.y * b.z - a.z * b.y;
y = a.z * b.x - a.x * b.z;
z = a.x * b.y - a.y * b.x;
}
public String toString() {
return "(" + x + ", " + y + ", " + z + ")";
}
}
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