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/*
* gleem -- OpenGL Extremely Easy-To-Use Manipulators.
* Copyright (C) 1998-2003 Kenneth B. Russell (kbrussel@alum.mit.edu)
*
* Copying, distribution and use of this software in source and binary
* forms, with or without modification, is permitted provided that the
* following conditions are met:
*
* Distributions of source code must reproduce the copyright notice,
* this list of conditions and the following disclaimer in the source
* code header files; and Distributions of binary code must reproduce
* the copyright notice, this list of conditions and the following
* disclaimer in the documentation, Read me file, license file and/or
* other materials provided with the software distribution.
*
* The names of Sun Microsystems, Inc. ("Sun") and/or the copyright
* holder may not be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED "AS IS," WITHOUT A WARRANTY OF ANY
* KIND. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
* WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, NON-INTERFERENCE, ACCURACY OF
* INFORMATIONAL CONTENT OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. THE
* COPYRIGHT HOLDER, SUN AND SUN'S LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL THE
* COPYRIGHT HOLDER, SUN OR SUN'S LICENSORS BE LIABLE FOR ANY LOST
* REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
* CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
* REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
* INABILITY TO USE THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGES. YOU ACKNOWLEDGE THAT THIS SOFTWARE IS NOT
* DESIGNED, LICENSED OR INTENDED FOR USE IN THE DESIGN, CONSTRUCTION,
* OPERATION OR MAINTENANCE OF ANY NUCLEAR FACILITY. THE COPYRIGHT
* HOLDER, SUN AND SUN'S LICENSORS DISCLAIM ANY EXPRESS OR IMPLIED
* WARRANTY OF FITNESS FOR SUCH USES.
*/
package gleem.linalg;
/** 2-element single-precision vector */
public class Vec2f {
private float x;
private float y;
public Vec2f() {}
public Vec2f(Vec2f arg) {
this(arg.x, arg.y);
}
public Vec2f(float x, float y) {
set(x, y);
}
public Vec2f copy() {
return new Vec2f(this);
}
public void set(float x, float y) {
this.x = x;
this.y = y;
}
/** Sets the ith component, 0 <= i < 2 */
public void set(int i, float val) {
switch (i) {
case 0: x = val; break;
case 1: y = val; break;
default: throw new IndexOutOfBoundsException();
}
}
/** Gets the ith component, 0 <= i < 2 */
public float get(int i) {
switch (i) {
case 0: return x;
case 1: return y;
default: throw new IndexOutOfBoundsException();
}
}
public float x() { return x; }
public float y() { return y; }
public void setX(float x) { this.x = x; }
public void setY(float y) { this.y = y; }
public float dot(Vec2f arg) {
return x * arg.x + y * arg.y;
}
public float length() {
return (float) Math.sqrt(lengthSquared());
}
public float lengthSquared() {
return this.dot(this);
}
public void normalize() {
float len = length();
if (len == 0.0f) return;
scale(1.0f / len);
}
/** Returns this * val; creates new vector */
public Vec2f times(float val) {
Vec2f tmp = new Vec2f(this);
tmp.scale(val);
return tmp;
}
/** this = this * val */
public void scale(float val) {
x *= val;
y *= val;
}
/** Returns this + arg; creates new vector */
public Vec2f plus(Vec2f arg) {
Vec2f tmp = new Vec2f();
tmp.add(this, arg);
return tmp;
}
/** this = this + b */
public void add(Vec2f b) {
add(this, b);
}
/** this = a + b */
public void add(Vec2f a, Vec2f b) {
x = a.x + b.x;
y = a.y + b.y;
}
/** Returns this + s * arg; creates new vector */
public Vec2f addScaled(float s, Vec2f arg) {
Vec2f tmp = new Vec2f();
tmp.addScaled(this, s, arg);
return tmp;
}
/** this = a + s * b */
public void addScaled(Vec2f a, float s, Vec2f b) {
x = a.x + s * b.x;
y = a.y + s * b.y;
}
/** Returns this - arg; creates new vector */
public Vec2f minus(Vec2f arg) {
Vec2f tmp = new Vec2f();
tmp.sub(this, arg);
return tmp;
}
/** this = this - b */
public void sub(Vec2f b) {
sub(this, b);
}
/** this = a - b */
public void sub(Vec2f a, Vec2f b) {
x = a.x - b.x;
y = a.y - b.y;
}
public Vecf toVecf() {
Vecf out = new Vecf(2);
for (int i = 0; i < 2; i++) {
out.set(i, get(i));
}
return out;
}
public String toString() {
return "(" + x + ", " + y + ")";
}
}
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