package edu.berkeley.qfat.geom;
import javax.media.opengl.*;
+import javax.media.opengl.glu.*;
/** vector in 3-space; immutable */
public final class Vec {
+
+ public static final Vec ZERO = new Vec(0,0,0);
+
public final float x, y, z;
public Vec(double x, double y, double z) { this((float)x, (float)y, (float)z); }
public Vec(float x, float y, float z) { this.x = x; this.y = y; this.z = z; }
public Vec(Point p1, Point p2) { this(p2.x-p1.x, p2.y-p1.y, p2.z-p1.z); }
public Vec cross(Vec v) { return new Vec(y*v.z-z*v.y, z*v.x-x*v.z, x*v.y-y*v.x); }
public Vec plus(Vec v) { return new Vec(x+v.x, y+v.y, z+v.z); }
+ public Point plus(Point p) { return p.plus(this); }
+ public Vec minus(Vec v) { return new Vec(x-v.x, y-v.y, z-v.z); }
public Vec norm() { return mag()==0 ? this : div(mag()); }
public float mag() { return (float)Math.sqrt(x*x+y*y+z*z); }
public float dot(Vec v) { return x*v.x + y*v.y + z*v.z; }