Line thickness doesn't seem to work

[baxelrod-bdai]

I would like to draw lines with some thickness so that i can raster them with a laser cutter. I tried two things:

d.append(sdxf.Line(points=[(1,0,0),(1,1,0)], thickness=0.5))
d.append(sdxf.Line(points=[(2,0,0),(2,1,0)], lineWeight=0.5))

Both displayed as standard thin lines in my dxf viewer. So i wrote an "extras" class that simply draws a rectangular solid for the line:

class ThickLine(Solid):
    """Use a 'Solid' to make a thick line"""
    def __init__(self, points, width, **common):
        _Entity.__init__(self, **common)
        dx = float(points[1][0]-points[0][0])
        dy = float(points[1][1]-points[0][1])
        L = math.sqrt(dx*dx + dy*dy)
        a = (points[0][0] - dy * (width / 2.0) / L, points[0][1] + dx * (width / 2.0) / L)
        b = (points[1][0] - dy * (width / 2.0) / L, points[1][1] + dx * (width / 2.0) / L)
        c = (points[1][0] + dy * (width / 2.0) / L, points[1][1] - dx * (width / 2.0) / L)
        d = (points[0][0] + dy * (width / 2.0) / L, points[0][1] - dx * (width / 2.0) / L)
        self.points = [a, b, c, d]

And here is some test code:

d.append(sdxf.ThickLine(points=[(0,1,0),(3,3,0)], width=0.25, color=1))
d.append(sdxf.ThickLine(points=[(1,1,0),(2,1,0)], width=0.1, color=2))
d.append(sdxf.ThickLine(points=[(0,3,0),(0,3.5,0)], width=2, color=3))
d.append(sdxf.ThickLine(points=[(0.5,0.5,0),(0.25,0,0)], width=0.15, color=4))