Re: [Gtk2hs-users] Cairo and Drawing Windows in gtk3

[Daniel W. <da...@wa...>]

I don't know much about gtk3, but I expect there is not a way to draw 
directly on a drawing area. Instead, ask the drawing area to trigger the 
draw event; there were a lot of ways to do this in gtk2, and it seems 
most of them still exist in the gtk3 package. You might want to start 
reading at

http://hackage.haskell.org/package/gtk3-0.12.5.6/docs/Graphics-UI-Gtk-Abstract-Widget.html#v:widgetQueueDraw

and click cross-referencing links to read about the related functions.

~d

On 2014-03-24 11:47, Daniel Díaz Casanueva wrote:
> Hi gtk folks.
> 
> I am writing an application using gtk3. At this point, I want to
> define a function that draws a picture in a canvas using cairo. What I
> have done so far is:
> 
> * Created a new DrawingArea with "drawingAreaNew".
> * Created a "Render ()" value, which contains the directives to draw
> the picture.
> 
> What I need to know is how to join these two pieces so the picture is
> drawn in the DrawingArea. I tried to use "renderWithDrawWindow", but
> it requires a DrawWindow as argument instead of a DrawingArea.
> However, there is no method to create a DrawWindow in gtk3. It seems
> this was different in the gtk package. How is this accomplished now? I
> have seen examples in the GitHub repo, but all the drawing seems to be
> associated with a "draw" event (see [1]), and I can't see how to do it
> outside the "draw" event. The picture I want to render will change
> over time, so I want to have a procedure to update it by myself.
> 
> Thank you in advance for any help in this regard.
> Daniel Díaz.
> 
> [1]
> - https://github.com/gtk2hs/gtk2hs/blob/master/cairo/demo/DrawingGtk3.hs
> [1]
> 
> Links:
> ------
> [1] 
> https://github.com/gtk2hs/gtk2hs/blob/master/cairo/demo/DrawingGtk3.hs
> 
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