How do I render thick 2D lines as polygons?

Question

I have a path made up of a list of 2D points. I want to turn these into a strip of triangles in order to render a textured line with a specified thickness (and other such th

Answer 1

I'm interested in this too, since I want to perfect my mapping application's (Kosmos) drawing of roads. One workaround I used is to draw the polyline twice, once with a thicker line and once with a thinner, with a different color. But this is not really a polygon, it's just a quick way of simulating one. See some samples here: http://wiki.openstreetmap.org/wiki/Kosmos_Rendering_Help#Rendering_Options

I'm not sure if this is what you need.