def dtf_darcircle(point, radius_miles, max_segments=12):
radius = distances.feet(radius_miles)
if max_segments <= 0:
raise Exception("max_segments must be between 1 and 360")
thetas = [math.radians(a) for a in range(0, 360, 360/max_segments)]
thetas.append(math.radians(360))
pts = []
for t in thetas:
pts.append(distances.Point(point.x + radius*math.cos(t),
point.y + radius*math.sin(t)))
return dtf_polygon(pts)
def gen_darcircles(self, dtfname, radius_miles, max_segments=12):
radius = distances.feet(radius_miles)
if max_segments <= 0:
raise Exception("max_segments must be between 1 and 360")
thetas = [math.radians(a) for a in range(0, 360, 360/max_segments)]
thetas.append(math.radians(360))
f = open(dtfname, "w")
for p in self.points:
pts = []
for t in thetas:
pts.append(distances.Point(p.x + radius*math.cos(t),
p.y + radius*math.sin(t)))
f.write("# Center %s\n" % p)
f.write(dtf.dtf_polygon(pts))