Hi Scott,
Amazing activity in this project. If you ever lack things to do here is a feature request.... :-)

For my hobby project I would find it useful to render an area between curves in a light shade of green or red/or any other color for that matter.

Edited by Scott to add todo list:

• • add arguments to PlotSignal() to support shading under the curve
• • add arguments to PlotSignalConst() to support shading under the curve
• • add arguments to PlotScatter() to support shading under the curve
• create PlotPolygon() to allow rendering of arbitrary shapes
• create PlotRectangle() to allow easy outlining of data areas