--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cocoaTouch/otherSrc/CGPointUtils.c	Thu Jan 07 05:23:23 2010 +0000
@@ -0,0 +1,40 @@
+/*
+ *  CGPointUtils.c
+ *  PinchMe
+ *
+ *  Created by Jeff LaMarche on 8/2/08.
+ *  Copyright 2008 __MyCompanyName__. All rights reserved.
+ *
+ */
+
+#include "CGPointUtils.h"
+#include <math.h>
+
+#define degreesToRadian(x) (M_PI * x / 180.0)
+#define radiansToDegrees(x) (180.0 * x / M_PI)
+
+CGFloat distanceBetweenPoints (CGPoint first, CGPoint second) {
+	CGFloat deltaX = second.x - first.x;
+	CGFloat deltaY = second.y - first.y;
+	return sqrt(deltaX*deltaX + deltaY*deltaY );
+};
+
+CGFloat angleBetweenPoints(CGPoint first, CGPoint second) {
+	CGFloat height = second.y - first.y;
+	CGFloat width = first.x - second.x;
+	CGFloat rads = atan(height/width);
+	return radiansToDegrees(rads);
+	//degs = degrees(atan((top - bottom)/(right - left)))
+}
+
+CGFloat angleBetweenLines(CGPoint line1Start, CGPoint line1End, CGPoint line2Start, CGPoint line2End) {
+	
+	CGFloat a = line1End.x - line1Start.x;
+	CGFloat b = line1End.y - line1Start.y;
+	CGFloat c = line2End.x - line2Start.x;
+	CGFloat d = line2End.y - line2Start.y;
+	
+	CGFloat rads = acos(((a*c) + (b*d)) / ((sqrt(a*a + b*b)) * (sqrt(c*c + d*d))));
+	
+	return radiansToDegrees(rads);
+}