Created
August 29, 2012 15:07
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draw2Dfunction
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import FreeCAD, FreeCADGui, Part | |
import math | |
def evalFunction(suppliedFunction, n): | |
"""This function uses eval to evaluate suppliedFunction. | |
It does in no way check whether suppliedFunction is evil, thus it is itself evil! | |
""" | |
return eval(suppliedFunction) | |
def draw2Dfunction(xFunction="n", yFunction="n", n=-5, nd=10, step=10, z=0, pol=0): | |
"""Draws 2-dimensional mathemathical functions | |
The function is drawn for n's between n and n+nd, in steps of 1/step, on the z-coordinate z. | |
Equations for x and y can be given (xFunction and yFunction arguments), they default to n. | |
If pol=1 then x is interpreted as r and y is interpreted as t. | |
""" | |
nStart=n | |
while math.fabs(n-nd)-1.0/step>0: | |
print "n: " + str(n) | |
x=evalFunction(xFunction, n) | |
y=evalFunction(yFunction, n) | |
nNext=n+math.copysign(1,nd-n)/step | |
print "nNext: " + str(nNext) | |
xNext=evalFunction(xFunction, nNext) | |
yNext=evalFunction(yFunction, nNext) | |
if pol==0: | |
nextSeg=(x,y,z),(xNext,yNext,z) | |
else: | |
nextSeg=(x*math.cos(y),x*math.sin(y),z),(xNext*math.cos(yNext),xNext*math.sin(yNext),z) | |
print "nextSeg: " + str(nextSeg) | |
nomme=Part.makeLine(*nextSeg) | |
if n==nStart: | |
WWire=Part.Wire([nomme]) | |
else: | |
WWire=Part.Wire([WWire,nomme]) | |
n=nNext | |
Part.show(WWire) | |
#Example usage: | |
draw2Dfunction(xFunction="0.5*n", yFunction="-0.75*n", n=0, nd=-math.pi, step=50, pol=1) |
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