X-Git-Url: http://git.megacz.com/?p=anneal.git;a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fqfat%2Fgeom%2FPlane.java;h=b3aacdd492ffecdd71f8062e0a681df2e608683d;hp=1789e55aee635d8773cdff9b74963f8cfce8a9d3;hb=64c6939d78acfa06e7bc380cb713e3800bf16be5;hpb=de2400d58116bd995e73baf7a429e22def1e4067

diff --git a/src/edu/berkeley/qfat/geom/Plane.java b/src/edu/berkeley/qfat/geom/Plane.java
index 1789e55..b3aacdd 100644
--- a/src/edu/berkeley/qfat/geom/Plane.java
+++ b/src/edu/berkeley/qfat/geom/Plane.java
@@ -1,27 +1,48 @@
 package edu.berkeley.qfat.geom;
 import javax.media.opengl.*;
 
-public class Plane {
+public class Plane implements AffineConstraint {
 
-    // FIXME: could be given by
     // ax+by+cz=d
+    public final float a, b, c, d;
 
-    public final Vec norm;
-    public final float dvalue;
+    public Vec norm() { return new Vec(a, b, c); }
 
     public Plane(Point p, Vec norm) {
-        this.norm = norm.norm();
-        this.dvalue = p.x*this.norm.x+p.y*this.norm.y+p.z*this.norm.z;
+        this.a = norm.x;
+        this.b = norm.y;
+        this.c = norm.z;
+        this.d = p.x*norm.x+p.y*norm.y+p.z*norm.z;
+    }
+
+    /** provided at least one of a,b,c is nonzero, return the Plane representing ax+by+cz=d */
+    public Plane(float a, float b, float c, float d) {
+        this.a = a;
+        this.b = b;
+        this.c = c;
+        this.d = d;
     }
 
     public Point intersect(Plane p1, Plane p2) {
+        Vec norm = norm();
         Plane p3 = this;
-        float z = p1.norm.dot(p2.norm.cross(p3.norm));
+        float z = p1.norm().dot(p2.norm().cross(p3.norm()));
         if (Math.abs(z) < 0.0001) return null;  // planes do not intersect at a point
-        Vec v1 = p2.norm.cross(p3.norm).times(-1 * p1.dvalue);
-        Vec v2 = p3.norm.cross(p1.norm).times(-1 * p2.dvalue);
-        Vec v3 = p1.norm.cross(p2.norm).times(-1 * p3.dvalue);
+        Vec v1 = p2.norm().cross(p3.norm()).times(-1 * p1.d);
+        Vec v2 = p3.norm().cross(p1.norm()).times(-1 * p2.d);
+        Vec v3 = p1.norm().cross(p2.norm()).times(-1 * p3.d);
         return Point.ZERO.plus(v1.plus(v2).plus(v3).times(1/z));
     }
 
+    public Point getProjection(Point p) {
+        throw new RuntimeException("not implemented yet");
+    }
+
+    public AffineConstraint intersect(AffineConstraint c, float epsilon) {
+        throw new RuntimeException("not implemented yet");
+    }
+
+    public AffineConstraint multiply(Matrix m) {
+        throw new RuntimeException("not yet implemented");
+    }
 }