1. Click one point within the left canvas
  2. Draw straight lines by clicking more points
  3. Draw curves by clicking with shift key down
  4. Hit Enter key to finish a polygon (only required for fill)
  5. Draw more shapes if you want, following step 1~4 repeatedly
(Clock wise or counter clock wise doesn't matter, but reverse direction inside a closed region will make a hole)

Fill shapes Stroke lines      Line width:

First -> Then -> Last -> Use [W][S][A][D] to move, and [I] or [K] to scale to see the resolution independent rendering result.