Parameters for X drawline:

1. Window in which to draw
2. X1
3. Y1
4. X2
5. Y2
6. relative-p
7. line-width
8. draw function
9. background-color
10. foreground-color
11. cap style
12. line style (solid, dashed, double-dashed)
13. dash pattern
14. dash offset
15. stipple bitmap
16. stipple origin X
17. stipple origin Y
18. clip mask
19. plane mask (for drawing on specific planes)