I'm searching informations about drawing simple curved arrow lines into free GIS like QGIS, in this problem data geometry is CIRCULARSTRING ( a type which exists in latest postgis version)
It seems GIS like QGIS doesn't actually support editing (and drawing?) of this type of geometry, so i'm searching a plugin like cadtools to draw this lines, but without transformation into simple LINESTRINGS, and try to using directly curve lines drawing function into QGIS API (or other free gis) , if it's possible ..
Any idea ? Thanks a lot! SR.