From 581b778f2cd394222074960148372cb0d3681389 Mon Sep 17 00:00:00 2001
From: Walter Bender <walter@sugarlabs.org>
Date: Fri, 16 Jul 2010 02:26:52 +0000
Subject: added intersection handling on expose event

---
diff --git a/sprites.py b/sprites.py
index 5c64b09..5577b4e 100644
--- a/sprites.py
+++ b/sprites.py
@@ -78,6 +78,7 @@ import gtk
 import gobject
 import pango
 
+
 #
 # A class for the list of sprites and everything they share in common
 #
@@ -125,9 +126,15 @@ class Sprites:
             if spr.hit(pos): return spr
         return None
 
-    def redraw_sprites(self):
+    def redraw_sprites(self, area=None):
         for spr in self.list:
-            spr.draw()
+            if area == None:
+                spr.draw()
+            else:
+                intersection = spr.rect.intersect(area)
+                if intersection.width > 0 or intersection.height > 0:
+                    spr.draw()
+
 
 #
 # A class for the individual sprites
@@ -153,10 +160,15 @@ class Sprite:
         self.images = []
         self._dx = [] # image offsets
         self._dy = []
+        self.rect = None
         self.set_image(image)
         if self._sprites is not None:
             self._sprites.append_to_list(self)
 
+    def set_rect(self):
+        self.rect = gtk.gdk.Rectangle(self._x, self._y, self._width,
+                                      self._height)
+
     def set_image(self, image, i=0, dx=0, dy=0):
         while len(self.images) < i+1:
            self.images.append(None)
@@ -178,16 +190,21 @@ class Sprite:
                 self._width = _w + dx
             if _h + dy > self._height:
                 self._height = _h + dy
+        self.set_rect()
 
     def move(self, pos):
         self.inval()
         self._x,self._y = int(pos[0]),int(pos[1])
+        self.rect.x = self._x
+        self.rect.y = self._y
         self.inval()
 
     def move_relative(self, pos):
         self.inval()
         self._x += int(pos[0])
         self._y += int(pos[1])
+        self.rect.x = self._x
+        self.rect.y = self._y
         self.inval()
 
     def get_xy(self):
diff --git a/tawindow.py b/tawindow.py
index 8bfdf72..81fe232 100644
--- a/tawindow.py
+++ b/tawindow.py
@@ -260,7 +260,9 @@ class TurtleArtWindow():
 
     def _expose_cb(self, win, event):
         """ Repaint """
-        self.sprite_list.redraw_sprites()
+        # TODO: send event GDK_EXPOSE area to redraw
+        # print event.area
+        self.sprite_list.redraw_sprites(event.area)
         # self.canvas.cr_expose(event)
         return True
 
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