Mercurial > hg > orthanc-stone
view Resources/Computations/IntersectSegmentAndHorizontalLine.py @ 625:2eeb5857eb43
DicomInstanceParameters
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 07 May 2019 18:11:52 +0200 |
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 # horizontal line "y = y0" using homogeneous coordinates prevX, prevY, curX, curY, y0 = symbols('prevX prevY curX curY y0') p1 = Matrix([prevX, prevY, 1]) p2 = Matrix([curX, curY, 1]) l1 = p1.cross(p2) h1 = Matrix([0, y0, 1]) h2 = Matrix([1, y0, 1]) l2 = h1.cross(h2) a = l1.cross(l2) #pprint(cse(a/a[2], symbols = symbols('a b'))) pprint(a / a[2])