Mercurial > hg > orthanc-stone
diff Resources/Computations/IntersectSegmentAndVerticalLine.py @ 132:35c2b85836ce wasm
fix rtstruct projections
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Fri, 17 Nov 2017 18:01:31 +0100 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Resources/Computations/IntersectSegmentAndVerticalLine.py Fri Nov 17 18:01:31 2017 +0100 @@ -0,0 +1,20 @@ +#!/usr/bin/env python + +from sympy import * + +# Intersection between the 2D line segment (prevX,prevY)-(curX,curY) and the +# vertical line "x = x0" using homogeneous coordinates + +prevX, prevY, curX, curY, x0 = symbols('prevX prevY curX curY x0') + +p1 = Matrix([prevX, prevY, 1]) +p2 = Matrix([curX, curY, 1]) +l1 = p1.cross(p2) + +h1 = Matrix([x0, 0, 1]) +h2 = Matrix([x0, 1, 1]) +l2 = h1.cross(h2) + +a = l1.cross(l2) + +pprint(a / a[2])