[Qgis-user] Decoration Grid / drawing tools

[Patrick Dunford]

Good day all

I note there is a canvas grid that can be turned on by going to View -> 
Decorations -> Grid. However the rotation of this appears to be fixed to 
north/south/east/west and does not appear to have any provision to be 
changed in rotation in any form, such as for example aligning to the 
four sides of the window.

Is there an option to do this or some setting that I have missed that 
would enable this?

Alternatively is there any kind of plugin available that would provide 
the required functionality?

Second issue is drawing tools. When I am tracing building outlines I 
want to be able to draw exact right angles with the sides of the 
building, which is easy using the rectangle digitising tool for regular 
rectangles, but not so easy when the the building has more than four 
corners in which case it is easier to draw by hand but I need some way 
of snapping the corners to exact 90 degree angles, Here I'm assuming the 
grid cannot be rotated as queried in my first question.

Supposing that plugins might provide additional tools to help achieve 
this, in the opinion of users of this group, which of these plugins 
could provide the best functionality?

Thanks.