--- a/skaapsteker/utils.py	Sat May 07 17:29:10 2011 +0200
+++ b/skaapsteker/utils.py	Sat May 07 20:28:06 2011 +0200
@@ -27,8 +27,29 @@
 cmul = mk_cop(operator.mul)
 cdiv = mk_cop(operator.div)
 cclamp = mk_cop(lambda a, b: max(min(a, b), -b))
+cabsmax = mk_cop(lambda a, b: a if abs(a) > abs(b) else b)
 
 cint = mk_cuop(int)
 cneg = mk_cuop(lambda a: -a)
 cabs = mk_cuop(abs)
 
+
+def rect_projection(rect1, rect2):
+    if not rect1.colliderect(rect2):
+        # No collision?
+        return (0, 0)
+
+    if rect1.center[0] < rect2.center[0]:
+        x_projection = rect2.left - rect1.right
+    else:
+        x_projection = rect2.right - rect1.left
+
+    if rect1.center[1] < rect2.center[1]:
+        y_projection = rect2.top - rect1.bottom
+    else:
+        y_projection = rect2.bottom - rect1.top
+
+    if abs(x_projection) < abs(y_projection):
+        return (x_projection, 0)
+    return (0, y_projection)
+