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)