Further ideas for PointLineHole

[phigas]

The PointLineHole can be used to draw shapes using a bunch of points and a circle will be drawn at every point.

• An option for having the ends of the line be flat instead of rounded could be useful
• Currently the scattering simply uses the circle scattering to determine the new phonon direction. Instead we could use the slope calculated with the adjacent points in the list. This way the shape would still be determined with the circles but the scattering would be "smooth".
• Instead of having a fixed thickness through the entire line the thickness could be variable. For example defined by a function