Sympy: Point evaluate=False after a point rotate

Question

I am new to python and I'm trying to generate a g-code using python. I'm using sympy because I also need to do segments, intersections, and even convex hull.

Given an initial point(s) I need to rotate it(them) +/- 120 degrees from the center (0,0), and my end result should be something like this:

"G0 X0 Y120.4"

I turn evaluate=False to get actual points, but the way I am doing it only works for the initial one and not for the others:

G0 X0 Y120.400000000000

G0 X-301*sqrt(3)/5 Y-301/5

How do I make the other points in the form of the initial Z point?

from sympy import Point, pi
z = Point(0, 120.4, evaluate = False)
x = z.rotate(pi*2/3)
y = z.rotate(-pi*2/3)

print('G0 X{0} Y{1}'.format(z.x,z.y))
print('G0 X{0} Y{1}'.format(x.x,x.y))

Answer 1 should be clear enough. Also evalf() [link] (http://docs.sympy.org/latest/_modules/sympy/geometry/point.html#Point.evalf) — MRGiacalone2005, Jun 10 '14 at 00:48

score 1 · Accepted Answer · answered Jun 08 '14 at 20:33

Try evaluate the coordinates before or during printing:

>>> Point(0, 120.4) # with evaluate=True, the Float is made Rational
Point(0, 602/5)
>>> _.n()  # evaluate the coordinates
Point(0, 120.400000000000)
>>> print('G0 X{0} Y{1}'.format(x.x.n(),x.y.n()))  # from your example
G0 X-104.269458615646 Y-60.2000000000000

Sympy: Point evaluate=False after a point rotate

1 Answers1