Advanced Sketch Primitive Editor

BRL-CAD supports many primitives, including a 2D sketch primitive, but we do not presently provide the means to specify values that are undetermined or otherwise dependent calculations. So we don't have a way to constrain (for example) a line segment to remain at a fixed angle relative to another line segment during editing.

This task would focus on implementing basic support for this feature in the context of BRL-CAD's sketch primitive. Options include:

• Integrate existing BSD licensed 2D constraint solving functionality from exising projects:
  • https://code.google.com/p/psketcher/
  • https://code.google.com/p/sketchsolve/

In particular, psketcher offers some Qt visualizations of sketch editing - a good "first step" would be to make a "Qt sketch editor" for BRL-CAD's sketch objects. This is likely to require refactoring psketcher and/or sketchsolve, but they do provide a starting point.

• Once a solving framework is in place and working with BRL-CAD sketch objects, test out the Gecode constraint solver by defining the 2D constraints from the above solvers in the Gecode framework - see how its solving speed compares to the dedicated 2D solutions, and how straightforward it is to use Gecode to solve such problems.
  • http://www.gecode.org/
  • http://www.gecode.org/doc-latest/reference/classCartesianHeart.html

This task is related to the more general parametric constraint tasks, but it is more narrowly scoped and more focused on immediately user visible features.

References

• https://code.google.com/p/psketcher/
• https://code.google.com/p/sketchsolve/
• http://www.gecode.org/
• http://www.gecode.org/doc-latest/reference/classCartesianHeart.html
• src/librt/primitives/sketch
  • contains sources pertaining to BRL-CAD's 2D sketch primitive

Requirements:

• Familiarity with C/C++