Create a planar curve whose tangent angle is determined by a given function at each point along its length. The angle at length $l$ as measured along the curve, equals the value of the function $f(l)$. The function values can be interpreted as either degrees or radians.

The curve starts at the origin of the given plane, with the plane x-axis pointing in the zero angle direction. That is, if $f(l)$ equals zero at $l=0$, the curve will start parallel to the x-axis.

Note that the resulting curve is a sampled approximation of the mathematically exact curve.