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General drawing screen management functions.
| Name | Description |
|---|---|
| ClearViewPort | Clear the current viewport |
| GetImage | Copy image from screen to memory |
| GetMaxX | Get maximum X coordinate |
| GetMaxY | Get maximum Y coordinate |
| GetX | Get current X position |
| GetY | Get current Y position |
| ImageSize | Get size of selected image |
| GetViewSettings | Get current viewport settings |
| PutImage | Copy image from memory to screen |
| SetActivePage | Set active video page |
| SetAspectRatio | Set aspect ratio for drawing routines |
| SetViewPort | Set current viewport |
| SetVisualPage | Set visual page |
| SetWriteMode | Set write mode for screen operations |