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arrowhead function adds a small arrow marker to the end of a line. It looks like this:
arrowhead(ctx, a, b, length=4)
|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
See the example in the angle_marker article.
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