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?
[GIS] How to draw polygons in QGIS perfectly aligned
alignmentpolygon-creationqgis
Related Solutions
You can chose between CAD Tools plugin which is more complex and more powerful,
or Rectangles ovals digitizing plugin.
After installing the plugin you may have trouble to locate the plugin tool icon or buttons. Look for the plugin tool icons in the toolbars, they are probably in grey color.
In Settings / Options / Digitizing, you can define the distance radius in pixel or map units to snap to other points.
And in Settings / Snapping options you can choose which layers can be used for snapping.
In QGIS 3.12, find this under Project > Snapping options and a new (possibly docked) window "Snapping and Digitizing Options" will appear (in my case, under the Layers panel).
The only thing that does not work is snapping to the points of a line or polygon you are just creating.
Software version: QGIS 2.18.20
Best Answer
There is a CadTools Plugin. AFIK it is only suitable tool for this task at the moment.