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tmgerard avatar tmgerard commented on June 7, 2024

Thanks! I goofed on that one. The equation you are showing looks like it is for a collection of regular shapes, which might not be the best fit for a polygon. I found another formula that looks like it was derived similarly to the shoelace algorithm I used for the area calculation that might be a better fit.

https://en.wikipedia.org/wiki/Polygon#Centroid

from matrix-structural-analysis-excel.

tmgerard avatar tmgerard commented on June 7, 2024

I added the area method and updated the centroid method. I thought I already had an area method, but that was something I did in another project. I added a few extra tests to check the area and centroid calculations for when the points of the polygon are added in a clockwise and counterclockwise order, which will affect the sign of the area.

Changes to Polygon2D class

from matrix-structural-analysis-excel.

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