fixed missing scroll, implemented scroll with blit

1 files changed, 5 insertions, 2 deletions

diff --git a/game1/tracktmx.py b/game1/tracktmx.py
index 51d76d7..d57caf2 100755
--- a/game1/tracktmx.py
+++ b/game1/tracktmx.py
@@ -51,7 +51,10 @@ class Track():
             self.cached_height = 0
         else:
             # scroll offset difference      
-            self.cached_surface.scroll(0, -int(offset - self.cached_offset))
+            # self.cached_surface.scroll(0, -int(offset - self.cached_offset))
+	    yoff = int(offset - self.cached_offset)
+	    area = pygame.Rect(0, yoff, self.cached_surface.get_width(), self.cached_surface.get_height() - yoff )
+	    self.cached_surface.blit(self.cached_surface, (0, 0), area)
             self.cached_height -= int(offset - self.cached_offset)
             if self.cached_height < 0:
                 self.cached_height = 0
@@ -226,4 +229,4 @@ class Track():
         
     def number_of_even(self):
         return self.num_even        
-        
\ No newline at end of file
+