> All functionality of IupCanvas can also be provided by IupBackgroundBox.
This is what "inherits" means. It actually inherits the implementation of IupCanvas. It is in C, but it is object oriented. IupBackgroundBox is a IupCanvas. > So in theory I can choose to always use IupBackgroundBox over IupCanvas. The behavior of a container inside a layout is not the same as a pure canvas. Also you are adding an overhead to your application that will never be used if it is just drawing in the canvas. > Continuing it seems that all functionality of IupCanvas, IupBackgroundBox, IupGLCanvas can be provided by IupGLBackground. Sort of, now you are increasing the overhead by adding OpenGL. Even if you don't use OpenGL, there will be calls to OpenGL functions so the IupGLCanvas can be initialized. > So if I always use IupGLCanvasBox I should never need to use the others. The IupGLCanvasBox container is not implemented in the same way as the IupGLBackgroundBox. The overhead of other libraries and dependencies is increased. IupGLCanvasBox is inside IupGLControls that is dependent from FTGL and Freetype. I would never recommend such simplification. Best, Scuri Em sáb., 13 de jun. de 2020 às 17:47, Milind Gupta <milind.gu...@gmail.com> escreveu: > Thanks for the summary. I had read their documentation and what I > understood and still seem to think from your summary is that: > > All functionality of IupCanvas can also be provided by IupBackgroundBox. > It provides additional functionality of serving as a container. So in > theory I can choose to always use IupBackgroundBox over IupCanvas. > > Continuing it seems that all functionality of IupCanvas, IupBackgroundBox, > IupGLCanvas can be provided by IupGLBackground. > > Also it seems that IupGLCanvasBox can provide all functionality of all the > above combined and add functionality to display the OpenGL based controls. > > So if I always use IupGLCanvasBox I should never need to use the others. > This is what I understood from the documentation and from your summary as > well. I think I am missing cases where say IupCanvas would be a better > choice than IupGLCanvasBox. What are those cases? > > Thanks, > Milind > > On Sat, Jun 13, 2020 at 11:39 AM Antonio Scuri <antonio.sc...@gmail.com> > wrote: > >> Hi, >> >> You got to take a look at their documentation. But here is a quick >> glimpse: >> >> * IupCanvas - the main control, where you can draw, all others inherit >> from this one >> * IupBackgroundBox - inherits from IupCanvas, but it is a container. So >> it is a container where you can draw or simply control the background color >> below other controls. >> * IupGLCanvas - inherits from IupCanvas, but adds OpenGL support. >> * IupGLBackground - inherits from IupGLCanvas, but it is a container like >> IupBackgroundBox. Same purpose but with OpenGL support. >> * IupGLCanvasBox - same as IupGLBackground, but it is designed for being >> the parent of a set of OpenGL based controls in the IupGLControls library. >> It has a more complex implementation than IupGLBackground so we decided to >> leave it as a separate control >> * IupGLSubCanvas - a virtual canvas used for the OpenGL based controls. >> It is not actually a canvas, it is a region inside the IupGLCanvasBox used >> as base for the IupGLControls library elements. >> >> Best, >> Scuri >> >> >> >> >> Em sáb., 13 de jun. de 2020 às 01:09, Milind Gupta < >> milind.gu...@gmail.com> escreveu: >> >>> Hi Antonio, >>> I am a little confused about all the canvas options in IUP. I >>> found these: >>> >>> * iupcanvas >>> * IupBackgroundBox >>> * IupGLCanvas >>> * IupGLBackground >>> * IupGLCanvasBox >>> * IupGLSubCanvas >>> >>> All of them can act like a canvas I believe. What are the specific >>> instances when each of them should be used? >>> >>> Regards, >>> Milind >>> _______________________________________________ >>> Iup-users mailing list >>> Iup-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/iup-users >>> >> _______________________________________________ >> Iup-users mailing list >> Iup-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/iup-users >> > _______________________________________________ > Iup-users mailing list > Iup-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/iup-users >
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