Thanks everyone. I'd already made quite a bit of progress on this, but my post was approved and made visible quite a few days later. Sorry I couldn't extend it further to reflect my progress. I think the suggestion by Lazur URH is fairly close to how I solved it, although I don't know why I would ne...

I am working with Inkscape to finalise some vector art for a laser cutter to produce an effect like... http://www.instructables.com/id/True-to-Scale-Landscape-On-Laser-Cutter/ ...and I need to be able to clip multiple paths to select a specific square of the terrain contour data. Unfortunately, &quo...

I need to space out rings in a grid to create a circuit layout, similar in nature to... http://shrimping.it/blog/wp-content/uploads/2012/09/Shrimpduino_stripboard_branded.png ...but the measurements have to be exact as I'll be using the vector art to drive a laser cutter. Consequently I've been wond...