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view Resources/Computations/IntersectSegmentAndVerticalLine.py @ 1262:ca2058bd74ef toa2020012702

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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>
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
# 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])