Added some improvements to test draw program.

src/draw.py

 #!/usr/bin/env python
 import pygame, sys, time
-from touch import add, MultiTouchListener
+from touch import MultiTouchListener
 from math import degrees, cos, sin
 
 from events import Rotate
@@ -19,14 +19,16 @@ RECT_COLOR = 0, 200, 0
 RECT_POS = W / 2, H / 2
 RECT_SIZE = W / 6., H / 6.
 
-TAP_RADIUS = 60
-TAP_INCREMENT = .25
+TAP_RADIUS = 65
+TAP_INCREMENT = .3
 
 BEAM_COLOR = 255, 50, 50
 BEAM_LENGTH = 50
 BEAM_WIDTH = 3
 BEAM_INCREMENT = .8
 
+MAX_SCALE = 10
+
 # Create canvas GUI in the current thread
 screen = pygame.display.set_mode((W, H))
 
@@ -60,7 +62,7 @@ def update():
     # Apply scale and rotation to a fixed-size rectangle canvas
     canvas = pygame.Surface(RECT_SIZE)
     canvas.fill(RECT_COLOR)
-    transformed = pygame.transform.rotozoom(canvas, degrees(angle), scale * 2)
+    transformed = pygame.transform.rotozoom(canvas, degrees(angle), scale)
     rect = transformed.get_rect()
     rect.center = W / 2, H / 2
     screen.blit(transformed, rect)
@@ -121,13 +123,13 @@ def rotate(event):
 
 def pinch(event):
     global scale
-    scale *= event.amount
+    scale = max(scale * event.amount, MAX_SCALE)
 
 
 # Start touch event listener in separate thread
 listener = MultiTouchListener(verbose=1, tuio_verbose=0)
 listener.bind('rotate', rotate)
-listener.bind('pinch', pinch)
+#listener.bind('pinch', pinch)
 listener.bind('tap', lambda e: taps.append([coord(*e.xy), FINGER_RADIUS]))
 listener.bind('single_tap', lambda e: dtaps.append(list(coord(*e.xy)) + [1]))
 listener.bind('double_tap', lambda e: dtaps.append(list(coord(*e.xy)) + [0]))