This module provides a monadic interface to build TPath values. It does so using PathBuilders. The construction of a PathBuilder is equivalent to the construction of a TPath by hand, but with a sometimes more convenient syntax.

For example, this path corresponds to a triangle:

trianglePath :: TPath
trianglePath = bpath (pointAtXY (-1) 0) $ do
   line $ pointAtXY 1 0
   line $ pointAtXY 0 1
   pcycle

The equivalent syntax created by hand would be:

trianglePath :: TPath
trianglePath = Cycle $ Start (pointAtXY (-1) 0) ->- pointAtXY 1 0 ->- pointAtXY 0 1

The Cycle constructor at the beginning may seem unintuitive, since we are building the path from left to right. In the PathBuilder monad, the instructions are always written in order.