From 6d18312e476d7f2e96d8aff9157d85d055f3c605 Mon Sep 17 00:00:00 2001
From: Walter Bender <walter@walter-laptop.(none)>
Date: Sun, 11 Oct 2009 21:16:21 +0000
Subject: prevent blocks from going off the left edge

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

diff --git a/tawindow.py b/tawindow.py
index 9cbb9db..5e7fcae 100644
--- a/tawindow.py
+++ b/tawindow.py
@@ -344,6 +344,11 @@ def mouse_move(tw, x, y, verbose=False, mdx=0, mdy=0):
             tw.draggroup = findgroup(find_top_block(spr))
         else:
             tw.draggroup = findgroup(spr)
+        # check to see if any block ends up with a negative x
+        for b in tw.draggroup:
+            if b.x+dx < 0:
+                dx += -(b.x+dx)
+        # move the stack
         for b in tw.draggroup:
             move(b,(b.x+dx, b.y+dy))
     elif spr.type=='turtle':
--
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