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ivanfratric / polypartition

Tiny Polygon Partitioning and Triangulation Library

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Is y axis inverted

ClaudeSChretien opened this issue · comments

commented

hi,
I tried to use the code and it worked well. I have plot the test_input.txt points on Excel and I wonder why it is upside down? Maybe because the y axis is inverted?

Thanks

commented

Positive "y" means down in most computer graphics environments. Excel might be treating it as up, as in normal graphs and what not.

commented

PolyPartition uses a Y-is-down coordinate system (left-handed, rotation is clockwise), which is the standard for most 2D computer graphics programs. This is the same coordinate system used by the Godot game engine and most image editors.