Mercurial > hg > orthanc-stone
view Resources/Computations/IntersectSegmentAndVerticalLine.py @ 1113:3924ddbbadda
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author | Alain Mazy <alain@mazy.be> |
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date | Mon, 04 Nov 2019 12:47:13 +0100 |
parents | 35c2b85836ce |
children |
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#!/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])