PyX — Example: path/arclen.py

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Arc length of a path

arclen.png
from pyx import *

c = canvas.canvas()

p1 = path.curve(0, 0, 1, 0, 1, 1, 2, 1)
p2 = path.line(0, 0, p1.arclen(), 0)
c.stroke(p1)
c.stroke(p2)

c.writeEPSfile("arclen")
c.writePDFfile("arclen")

Description

In this example we use the arclen method of the path instance p1 to get the arc length and create a straight line p2 with the same arc length.

While here we use the return value of the arc length as a parameter to a path constructor, you might be interested in what kind of object the return value of the arclen method call really is: It is a PyX length in true coordinates, since the path already analyses the PyX units and the return value thus needs to be fixed and can not be scaled anymore. Printing the result of the arclen method call of path p1 would show you:

(0.023110 t + 0.000000 u + 0.000000 v + 0.000000 w + 0.000000 x) m