edgePoints              Calculate edge points
grid.brushXspline       Sweep an X-spline curve with a brush.
grid.offsetBezier       Draw a Bezier Offset Curve.
grid.offsetXspline      Draw an X-spline offset curve.
grid.vwXspline          Draw a variable-width X-spline.
grid.vwcurve            Draw a variable-width smooth curve.
grid.vwline             Draw a variable-width set of line segments.
outline                 Calculate outline
vwPath                  Functions to render variable-width line
widthSpec               Specify the width of a variable-width line
