github.com/pavlo67/common@v0.5.3/common/mathlib/plane (about) angle.go chain_projections.go chain_projections_test.go chain_projections_test1.go chains.go chains_test.go contour.go contour_test.go direction.go lines.go lines_test.go points.go points_test.go rectangles.go segments.go segments_test.go shapes.go transformation.go