SOLVESPACE -- parametric 2d/3d CAD

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2D Parametric Drafting (by Andrew McIntyre)
I would like to create a 2D parametric drawing for some boxes of varying shapes and sizes that are cut and folded from sheet steel. Although Solvespace permits me to alter the panel sizes quickly and simply I haven't quite worked out how to deal with 'constants'.

For instance the base panel is always enclosed within the side panels and needs to be 4mm less in both directions whereas an extra allowance of say 2 millimetres is needed where edges are folded for jointing purposes.

Is there a facility in Solvespace I have overlooked that allows elements to be referenced and fixed values added/subtracted? If not I guess the best alternative would be to add or omit thin strips in the required places using construction lines?
Tue Oct 7 2014, 18:17:12
(no subject) (by Jonathan Westhues)
There's no way to specify a relationship in SolveSpace algebraically; everything comes from the geometry. So construction lines would work, as you say; or to add, for example, you can just draw the line as two lines, and constrain the length of each piece.
Fri Oct 17 2014, 14:04:02
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