Mercurial > hg > orthanc-stone
view Resources/Computations/IntersectSegmentAndHorizontalLine.py @ 1262:ca2058bd74ef toa2020012702
Changed fingerprint from uuid_t to int64_t + poor man's
checksum (to fix emscripten syscall error + make it faster)
author | Benjamin Golinvaux <bgo@osimis.io> |
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date | Mon, 27 Jan 2020 15:13:00 +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 # 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])