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emWin and How to use Window as canvas

Question asked by antos.jiri on Oct 13, 2014

Is it possible to use window in STemWin as canvas?
I mean this - I have two window on display. One is on background and the other is above it. The second is state window - there are showed system information as needed. There is access from two tasks. The first one is window, which would be used as canvas. A few of user task can draw simple graphics objects - line, rectangle, circle, text.
Sometimes user draw is made in the second window. I have configured STemWin for work as multitasking. I was looking for some function, which select window where I want to draw, but I did not find it.
Can you somebody tell me, what is the right way?
Thank you for help.