Alan G Isaac venit, vidit, dixit 13.10.2009 21:09:
> What is the PyX equivalent to the following?
>
> 288 360 moveto
> 4 {144 0 rlineto 72 rotate} repeat closepath stroke
>
How about
unit.set(defaultunit="pt")
c = canvas.canvas([style.linewidth(1)])
x,y = 144,0
p = path.path(path.moveto(0,0))
for i in range(4):
p.append(path.rlineto(x,y))
x,y = trafo.rotate(72).apply(x,y)
p.append(path.closepath())
c.stroke(p, [trafo.translate(288,360)])
This results in
288 360 moveto
432 360 lineto
476.498 496.952 lineto
360 581.593 lineto
243.502 496.952 lineto
closepath
stroke
for the ps (besides gsave and such). Using PyX-trafos on points is the
closest you get to PS's rotated coordinate system, and there's no way to
create a "repeat" or "rlineto". Of course you could do things
differently in PyX, such as rotating a path.line around and joining
those rather than appending path elements:
unit.set(defaultunit="pt")
c = canvas.canvas([style.linewidth(1)])
pl = path.line(0,0,144,0)
p = path.path(path.moveto(0,0))
x0,y0 = 0,0
for i in range(4):
p = p << pl
x,y = p.atend()
pl = pl.transformed(trafo.rotate(72, x=x, y=y)*trafo.translate(x-x0,
y-y0))
x0, y0 = x,y
p.append(path.closepath())
c.stroke(p, [trafo.translate(288,360)])
Cheers,
Michael
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