Example

1  void DrawContents( TGrafPort* thePort )
2  {
3      TEllipse normalEllipse( TGEllipse ( TGRect( 10, 10, 20, 20 ) ),
4          TGrafBundle( TRGBColor( 0,0,0 ) ) );
5  
6      TCachedGraphic fastEllipse( normalEllipse );
7  
8      init i;
9      TGPoint offset( 5, 5 );
10      for( i = 0; i < 50, i++ )
11      {
12          normalEllipse.Draw( port );
13          normalEllipse.TranslateObjectBy( offset );
14      }
15  
16      for( i = 0; i < 50, i++ )
17      {
18          fastEllipse.Draw( port );
19          fastEllipse.TranslateObjectBy( offset );
20      }
21  
22      TGPoint scale( 1.05, 1.05 );
23      fastEllipse.ScaleBy( scale );
24      fastEllipse.Draw( port );
25  }

Line 6: Created a cached ellipse.

Lines 8 through 14: Draw 50 ellipses without caching.

Lines 16 through 20: Draw 50 ellipses with caching. The first one is slow because the cache gets initialized the first time.

Lines 22 through 24: Scale the cached ellipse. The cache is discarded and must be regenerated. This is slow.