From f7a43a4ad3b63859e4a534b3e8648100590cc3c3 Mon Sep 17 00:00:00 2001
From: Walter Bender <walter@sugarlabs.org>
Date: Wed, 11 Dec 2013 23:00:22 +0000
Subject: add tracing; minor bug fixes

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

diff --git a/physics.py b/physics.py
index 20502bd..b0cad5e 100644
--- a/physics.py
+++ b/physics.py
@@ -70,6 +70,7 @@ class PhysicsGame:
 
         self.full_pos_list = []
         self.tracked_bodies = []
+        self.body_colors = []
 
     def switch_off_fake_pygame_cursor_cb(self, panel, event):
         self.show_fake_cursor = False
@@ -138,14 +139,25 @@ class PhysicsGame:
                         if type(body.userData) == type({}):
                             if body.userData.has_key('track_index'):
                                 trackdex = body.userData['track_index']
-                                tupled_pos = tuple_to_int(
-                                    (body.position.x, body.position.y))
+
+                                def to_screen(pos):
+                                    px = self.world.meter_to_screen(
+                                                pos[0])
+                                    py = self.world.meter_to_screen(
+                                                pos[1])
+                                    py = self.world.renderer.get_surface() \
+                                            .get_height() - py
+                                    return (px, py)
+
+                                x = body.position.x
+                                y = body.position.y
+                                tupled_pos = to_screen((x, y))
                                 posx = tupled_pos[0]
                                 posy = tupled_pos[1]
                                 try:
                                     self.full_pos_list[trackdex].append(posx)
                                     self.full_pos_list[trackdex].append(posy)
-                                except:
+                                except IndexError:
                                     self.full_pos_list.append([posx, posy])
 
                             if body.userData.has_key('rollMotor'):
--
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