diff --git a/processingDemo/Clipping.pde b/processingDemo/Clipping.pde
index 2162c74..f6fcab3 100644
--- a/processingDemo/Clipping.pde
+++ b/processingDemo/Clipping.pde
@@ -3,23 +3,10 @@
  * https://en.wikipedia.org/wiki/Cohen%E2%80%93Sutherland_algorithm
  */
 
-class Point2
-{
-    float x;
-    float y;
-
-    Point2(float _x, float _y)
-    {
-        x = _x;
-        y = _y;
-    }
-}
-
-
 class Clipping
 {
-    final Point2 min;
-    final Point2 max;
+    final PVector min;
+    final PVector max;
 
     final static int INSIDE = 0;
     final static int LEFT = 1;
@@ -27,7 +14,7 @@ class Clipping
     final static int BOTTOM = 4;
     final static int TOP = 8;
 
-    Clipping(Point2 p0, Point2 p1)
+    Clipping(PVector p0, PVector p1)
     {
         float x0, y0, x1, y1;
 
@@ -51,11 +38,11 @@ class Clipping
             y1 = p0.y;
         }
 
-        min = new Point2(x0, y0);
-        max = new Point2(x1, y1);
+        min = new PVector(x0, y0);
+        max = new PVector(x1, y1);
     }
 
-    int compute_code(Point2 p)
+    int compute_code(PVector p)
     {
         int code = INSIDE;
         if (p.x < min.x)
@@ -79,7 +66,7 @@ class Clipping
     // rectangular clipping region min/max.
     // p0 and p1 will be modified to be in the region
     // returns true if the line segment is visible at all
-    boolean clip(Point2 p0, Point2 p1)
+    boolean clip(PVector p0, PVector p1)
     {
         int code0 = compute_code(p0);
         int code1 = compute_code(p1);
diff --git a/processingDemo/swarm.pde b/processingDemo/swarm.pde
index 9c702f4..828d1ae 100644
--- a/processingDemo/swarm.pde
+++ b/processingDemo/swarm.pde
@@ -15,24 +15,24 @@ class Particle
 
 	void bee_move(PVector t)
 	{
-		PVector d = minus(t, p);
+		PVector d = PVector.sub(t, p);
 
-		float dist = mag(d);
+		float dist = d.mag();
 		if (dist == 0)
 			dist = 1;
 
 		// adjust the accelerations up to the maximum
 		// add some random noise to ensure that they don't bunch
-		PVector dv = times(d, max_a / dist);
-		v = plus(limit(plus(v, dv), -max_v, max_v), random3(-1,-1));
+		PVector dv = PVector.mult(d, max_a / dist);
+		v = PVector.add(limit(PVector.add(v, dv), -max_v, max_v), random3(-1,-1));
 
-		p = plus(p, v);
+		p.add(v);
 	}
 
 	void wasp_move()
 	{
 		// wasp is not acceleration limited
-		v = limit(plus(v, random3(-5, 5)), -max_wasp_v, max_wasp_v);
+		v = limit(PVector.add(v, random3(-5, 5)), -max_wasp_v, max_wasp_v);
 
 		// nudge the wasp towards the center of the screen
 		if (p.x < width/2)
@@ -50,7 +50,7 @@ class Particle
 		else
 			v.z -= random(2);
 
-		p = plus(p, v);
+		p.add(v);
 
 		// bounce the wasp off the corner of the screen
 		if (p.x < 0 || p.x > width)
@@ -65,7 +65,7 @@ class Particle
 
 	void draw(boolean bright)
 	{
-		PVector p2 = minus(p,v);
+		PVector p2 = PVector.sub(p,v);
 		vector_line(bright, p, p2);
 	}
 };
diff --git a/processingDemo/vector.pde b/processingDemo/vector.pde
index 59beac8..1900b30 100644
--- a/processingDemo/vector.pde
+++ b/processingDemo/vector.pde
@@ -1,5 +1,9 @@
 /** \file
- * V.st vector board interface
+ * V.st vector board interface.
+ *
+ * This handles storing the vectors, clipping them to the display,
+ * mirroring the line segments on the real display and sending them
+ * to the serial port.
  */
 import processing.serial.*;
 
@@ -18,8 +22,8 @@ void
 vector_setup()
 {
 	clip = new Clipping(
-		new Point2(0,0),
-		new Point2(width-1,height-1)
+		new PVector(0,0),
+		new PVector(width-1,height-1)
 	);
 	// finding the right port requires picking it from the list
 	// should look for one that matches "ttyACM*" or "tty.usbmodem*"
@@ -37,16 +41,6 @@ vector_setup()
 }
 
 
-boolean
-vector_offscreen(
-	float x,
-	float y
-)
-{
-	return (x < 0 || x >= width || y < 0 || y >= height);
-}
-
-
 void
 vector_line(
 	boolean bright,
@@ -56,46 +50,40 @@ vector_line(
 	float y1
 )
 {
+	vector_line(bright, new PVector(x0,y0), new PVector(x1,y1));
+}
+
+
+void
+vector_line(
+  boolean bright,
+  PVector p0_in,
+  PVector p1_in
+)
+{
+	if (p0_in == null || p1_in == null)
+		return;
+
 	// can we detect resize?
 	clip.max.x = width-1;
 	clip.max.y = height-1;
 
-	Point2 p0 = new Point2(x0,y0);
-	Point2 p1 = new Point2(x1,y1);
-
 	stroke(bright ? 255 : 120);
+
+	// clipping might modify the point, so we must copy
+	PVector p0 = p0_in.copy();
+	PVector p1 = p1_in.copy();
+
 	if (!clip.clip(p0, p1))
 		return;
 
 	line(p0.x, p0.y, p1.x, p1.y);
 
-	// The clip above should ensure that this never happens
-	// but just in case, we will discard those points
-	if (vector_offscreen(p0.x,p0.y)
-	||  vector_offscreen(p1.x,p1.y))
-	{
-		return;
-	}
-
 	vector_point(1, p0.x, p0.y);
 	vector_point(bright ? 3 : 2, p1.x, p1.y);
 }
 
 
-void
-vector_line(
-  boolean bright,
-  PVector p0,
-  PVector p1
-)
-{
-  if (p0 == null || p1 == null)
-    return;
-  vector_line(bright, p0.x, p0.y, p1.x, p1.y);
-}
-
-
-
 void
 vector_point(
 	int bright,
@@ -141,28 +129,6 @@ void vector_send()
 	bytes[byte_count++] = 0;
 }
 
-/*
- * 3D vector math operations
- */
-PVector plus(PVector a, PVector b)
-{
-	return new PVector(a.x + b.x, a.y + b.y, a.z + b.z);
-}
-
-PVector minus(PVector a, PVector b)
-{
-	return new PVector(a.x - b.x, a.y - b.y, a.z - b.z);
-}
-
-PVector times(PVector a, float k)
-{
-	return new PVector(k*a.x, k*a.y, k*a.z);
-}
-
-float mag(PVector a)
-{
-	return sqrt(a.x*a.x + a.y*a.y + a.z*a.z);
-}
 
 PVector random3(float min, float max)
 {
@@ -189,7 +155,7 @@ PVector limit(PVector x, float min, float max)
 
 PVector unit(PVector x)
 {
-	return times(x, 1.0 / mag(x));
+	return PVector.mult(x, 1.0 / x.mag());
 }