created new class drawingCanvas

created new class drawingCanvas
commit

commit
commit

commit
some code improvements

some code improvements
managing canvas creation deletion

managing canvas creation deletion
code clean
ad

ad
cleaning polyline

cleaning polyline
code clean

code clean
commit

commit
commit

commit
commit

commit
commit

commit
drawing v0.1 ok

drawing v0.1 ok
extruding drawing v0.2 ok

no crossing lines!!
fix - extrude with no draw - reset

fix - extrude with no draw - reset
code clean

code clean