The VtChDrawMode constants provide options for redisplaying a chart after it has been altered.
| Constants | Description |
| VtChDrawModeDraw | Draw mode. The chart is redrawn on the screen every time you change a setting. |
| VtChDrawModeBlit | Blit mode. The chart is redrawn off the screen and displayed after the redraw is complete. |
Blit mode stores a bitmap copy of the chart in memory when the chart is laid out. Repainting the chart uses the bitmap and draws very quickly. It requires more memory than Draw mode, but can save time waiting for the chart to redraw on screen. Blit mode is particularly useful when working with charts that contain many elements.