clip fitting to the edges

clip will remove all parts of an object outside the convex hull.

Essentially, the convex hull looks like the edge of a rubber band wrapped around an object.

In the image below, the red border represents the convex hull. Note that it does not reach into the indentation in the triangle.

After drawing a custom sprite using drawon, clip can be used to make the sprite the shape of the drawing.

c = new Sprite
pen red
drawon c
fd 100
rt 90
fd 100
turnto 0, 0
moveto 0, 0
home()
pen null
plan ->
  c.clip()

However, it does not clip concave areas. This is because they are within the convex hull.

c = new Sprite
pen red
drawon c
fd 100
rt 90
fd 50
rt 45
fd 25
lt 90
fd 25
rt 45
fd 20
moveto 0, 0
home()
pen null
plan ->
  c.clip()

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