Hi there,
I need an advice on how to structure a little app that I am trying to develop for myself.
The purpose of the app is to load a technical drawing (tif, jpeg) in a canvas and to draw vector based shapes (lines, circle…) on top of it with the ability to edit it afterward.
What about:
A Canvas for the drawing (Canvas1)
A second canvas (Canvas2) with transparency on top of it containing all the vector shapes
Keep each vector shape in a database table (each property like x, y width, height, color etc… being stored in a record)
Obviously when scrolling or resizing the Canvas1, the Canvas2 would have to be synchronised.
A REAL challenge for me 
Thanks for any advice
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