def main(filein, fileout, width, height, gap):
d = dxfgrabber.read(filein)
def flipxy(p):
return (p[1], p[0])
layers = {}
for r in d.entities:
if not r.layer in layers:
layers[r.layer] = []
layers[r.layer].append(map(flipxy, r.points))
polys_to_cut = []
for (_, ps) in layers.iteritems():
polys_to_cut += map(lambda p: geo.extend_poly(gap, p, False), ps)
h = height / 2.0
w = width / 2.0
gndplane = Polygon([(h, w), (-h, w), (-h, -w), (h, -w)])
for p in polys_to_cut:
gndplane = gndplane - Polygon(p)
# Polygon.triStrip() returns a list of tristrips which need to be
# turned into quads, and the list needs to be flattened.
layers["GROUND"] = [
quad for quads in map(
geo.tristrip_to_quads,
gndplane.triStrip())
for quad in quads]
drawing = DXFEngine.drawing(fileout)
for (l, qs) in layers.iteritems():
for q in qs:
drawing.add(DXFEngine.face3d(map(flipxy, q), layer=l))
drawing.save()