From d610e626c0f6085fa27de62a3113ef722a310f85 Mon Sep 17 00:00:00 2001
From: Alex <alex@Tiresias.(none)>
Date: Tue, 08 Jul 2008 21:11:48 +0000
Subject: Total Reorganization! Now a proper activity (I hope)

---
(limited to 'helpers.py')

diff --git a/helpers.py b/helpers.py
new file mode 100644
index 0000000..87dd4f7
--- /dev/null
+++ b/helpers.py
@@ -0,0 +1,22 @@
+#==================================================================
+#                           Physics.activity
+#                     Helper classes and functions
+#                           By Alex Levenson
+#==================================================================
+import math
+# distance calculator, pt1 and pt2 are ordred pairs
+def distance(pt1, pt2):
+        return math.sqrt((pt1[0] - pt2[0]) ** 2 + (pt1[1] -pt2[1]) ** 2)
+
+# returns the angle between the line segment from pt1 --> pt2 and the x axis, from -pi to pi
+def getAngle(pt1,pt2):
+    xcomp = pt2[0] - pt1[0]
+    ycomp = pt1[1] - pt2[1]
+    return math.atan2(ycomp,xcomp)
+
+# returns a list of ordered pairs that describe an equilteral triangle around the segment from pt1 --> pt2
+def constructTriangleFromLine(p1,p2):
+    halfHeightVector = (0.57735*(p2[1] - p1[1]), 0.57735*(p2[0] - p1[0]))
+    p3 = (p1[0] + halfHeightVector[0], p1[1] - halfHeightVector[1])
+    p4 = (p1[0] - halfHeightVector[0], p1[1] + halfHeightVector[1])
+    return [p2,p3,p4]
--
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