Currently struggling with producing #SVG for labelling rivers. I need a #Bézier curve offset to place the label on an invisible path next to the river instead of on the river itself. So now I need to implement the heuristic approximation method proposed by Tiller and Hanson. This involves a lot of paper and ink.
https://math.stackexchange.com/a/467038
Image 1 shows the solution I am unhappy with. Image 2 shows the heuristic with simple control point translation. That's not good enough.
@kensanata Can you not offset (a copy of) the River Curve itself (by a constant x+2, y+2, or figure out the "normal" of the river and offset in that direction), and just use that?
@jos That only works for straight rivers. In curves, a different section of the river will now intersect the offset curve and the label on it.
@jos Hm, I guess if you argued that all the labels will be short then the river segment they will be placed on might be straight enough. I’d have to give it a try with some generated river names.