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 |
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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]) |