[Rd] the C function drawing a rectangle: heatmap() -> image() -> do_image() -> GRect() -> GERect() -> rect() -> do_rect() -> GRect() ??

[Peter Dalgaard]

Zhaoyuan Fang wrote:
> Hello anyone used to do similar things: search for the final C function that corresponding to the drawing of a rectangle? 
>
> As listed in the subject, I started from heatmap() in R and after several steps reached the GRect() in C. However, then it refers to rect() which further seems to refer to do_rect(), and then, surpringly, do_rect refers to GRect()!!! A dependency circle! How can it work if no functions soly taking the job for drawing a rectangle?  
>
> I know there must be somewhere wrong in my above function "chain", and can you help me to find it out? Many thanks!
>  				
> https://stat.ethz.ch/mailman/listinfo/r-devel
>   
I see GRect() calling GERect() calling dd->dev->rect(), i.e. a function 
in the current device structure. This will typically have been set to 
something like X11_Rect() or Cairo_Rect() or ....

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