| eraseWindow() | Clears the screen | 
| setColor(color) | Set current pen color | 
| setLinestyle(style) | Set current pen style | 
| setLinewidth(width) | Set current pen width | 
| setTextColor(foreground, background) | Set text colors | 
| setMarker(type,color) | Set marker attibutes | 
| setRasterOp(rasterOp) | Set raster operator |