A basic override of drawRect which will show you how much of the view is being redrawn in a given pass. Useful to help minimize drawing.

• (void)drawRect:(NSRect)aRect { int percentArea = (aRect.size.width * aRect.size.height) / ([self frame].size.width *[self frame].size.height) * 100; NSLog(@”MyView drawRect: of area %d%% of total”, percentArea);

  [super drawRect:aRect]; }