Need to add method to transform to different axes.

Ixy currently calc'd by perpendicular axis theorem rather than shoelace # algorithm. Currently the calculation in correct.

Issues with shoelace formula being evaluated, so that we can implement that formula instead.

Add classes that will build locus of points for specific, standard shapes, in terms of polygons.

For example: represent circles or ellipses as polygons with large numbers of points. This will allow the useb of other methods in module.

• classic linear interpolation
• linear interpolation with a grid of values
• bilinear interpolation

Add method to calc section modulii

Add method calculate plastic section modulii.

Algorithm will need to calc A/2, then sweep from one end to find PNA.

Properties calc'd assuming CCW traversing coordinate array. CW traverse results in negative values of the correct magnitude.

Trying to consider if I want to use this behavior, or simply ret abs values.

Add method to mesh polygon. Perhaps considered using ear clipping method, based on the two ears theorem.

wishlist item add test to evaluate if coordinate array supplied self-intersects.