I would like to draw polygons for an indoor map test and would like to draw perfect rectangles (horiz. and vertical edges). How to set QGIS options on polygon edit /draw to do that?
There is a CadTools Plugin. AFIK it is only suitable tool for this task at the moment.
Hope that I got your question right..The plugin "rectangles ovals digitizig tools" lets you draw perfect polygons. Just set the vector layer on edit and and draw them.