Mercurial > hg > orthanc-stone
comparison 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 |
| parents | |
| children |
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| 131:3e6163a53b16 | 132:35c2b85836ce |
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| 1 #!/usr/bin/env python | |
| 2 | |
| 3 from sympy import * | |
| 4 | |
| 5 # Intersection between the 2D line segment (prevX,prevY)-(curX,curY) and the | |
| 6 # vertical line "x = x0" using homogeneous coordinates | |
| 7 | |
| 8 prevX, prevY, curX, curY, x0 = symbols('prevX prevY curX curY x0') | |
| 9 | |
| 10 p1 = Matrix([prevX, prevY, 1]) | |
| 11 p2 = Matrix([curX, curY, 1]) | |
| 12 l1 = p1.cross(p2) | |
| 13 | |
| 14 h1 = Matrix([x0, 0, 1]) | |
| 15 h2 = Matrix([x0, 1, 1]) | |
| 16 l2 = h1.cross(h2) | |
| 17 | |
| 18 a = l1.cross(l2) | |
| 19 | |
| 20 pprint(a / a[2]) |