Martin McBride, 2020-08-25
Tags geometry arrow
Categories generativepy generative art

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The arrowhead function adds a small arrow marker to the end of a line. It looks like this:

arrowhead(ctx, a, b, length=4)

Parameter Type Description
ctx Context The Pycairo Context to draw to
a (number, number) Tuple (x, y) for point a
b (number, number) Tuple (x, y) for point b
length number length of the tick in user units.

Draws an arrowhead on the line ab. The arrow point is at b and points in the direction a to b.

## Example

See the example in the angle_marker article.