X-Git-Url: http://git.megacz.com/?p=anneal.git;a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fqfat%2Fgeom%2FVec.java;h=979cf2d914aeac420d0e37c8ad747e52bc91c775;hp=9d1d30bb79d31f657ec5ab4a823711050b504171;hb=20fe91a50615c12bdfdec4a72665ff92a700abd5;hpb=a7fd75e5e49f8fe897318a0e7daec1217ab0c126

diff --git a/src/edu/berkeley/qfat/geom/Vec.java b/src/edu/berkeley/qfat/geom/Vec.java
index 9d1d30b..979cf2d 100644
--- a/src/edu/berkeley/qfat/geom/Vec.java
+++ b/src/edu/berkeley/qfat/geom/Vec.java
@@ -1,14 +1,20 @@
 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; }