Hi,
I'm porting a widget toolkit (EiffelVision: https://eiffelsoftware.origo.ethz.ch/Vision4Mac_Documentation) to Carbon. The toolkid has a DrawingArea. This is a widget, where it is possible to draw some lines, circles, squares... in.
I thought that I can use a hiImageView and draw with Quarz into it. Unfortunately I have some trouble in implementing it. For Quarz drawings, I need a Context. right? In the Quarz2d guide I read that I need a keventcontolDraw Event to get the context.
The problem is the following: If I want to draw a square into the imageview, I store the coordinates into a global variable and call hiviewsetneedsdisplay to get the controlDraw event. Then in the event handler I get the context with getEventParameters.
This works fine. But if I want to draw a second square, over the first one. The first one gets lost (because of the redraw of the hiimageview). How can I draw something new into the imageview without losing the old content?
I tried also to store the context reference globaly an then draw to it whenever I wan't to draw to it. But then the drawings are not drawn into the imageview but somwehere else in the window.
Has anybody some hints how to implement it? Is there a better possbibilty than the one I tried (getting the context from a event).
Thanks
Ueli Peter
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