Feature request - only show relevant spoke ratios in Star Tool

[Daniel McRae]

If you right click on the star tool spoke ratio box, you are presented with a list of spoke ratios that can be useful, such as the ratios for various different stars; e.g. it shows the ratios for a regular pentagram and hexagram.

I suggest only showing the ratios for the currently selected number of corners.

For a N point star, there are floor((N-3)/2) possible stars (e.g. for 5 points, 1 star available, for 7 points, 2 stars). If we describe the star by which point we skip to counting from the current one as zero (call this n), then the spoke ratio is cos(pi*n/N)/cos(pi*(n-1)/N), per the attached pdf.

Of course, if for example you have a 20 point star, then displaying all 8 spoke ratios begins to get too much, so there would need to be a cut-off point.