Hi,
It is much simpler than that. IupBackgroundBox *is* a IupCanvas. Just use
it in the same way. No need for HDC access.
Best,
Scuri
Em seg., 21 de jun. de 2021 às 17:59, Isaac Raway <is...@mm.st> escreveu:
> Is there any way to use IupBackgroundBox with CD?
>
> I am currently using an IupCanvas and drawing into it successfully using
> CD. I would like to parent other controls onto this surface (such as
> IupMultitext, IupButton), but retain the ability to draw using CD since I
> have a lot of code written using that.
>
> So if there was a way to copy the result from CD into IupBackgroundBox
> using IupDraw that would seem to do the job, but I can't quite seem to get
> it to work. The only way I could figure out to create a cdCanvas was to
> use CD_NATIVEWINDOW with a new Win32 HWND. The graphics are drawn into the
> HWND but then I can't get it copied out there into the BackgroundBox.
>
> Here's what I have:
>
> void win_create()
> {
>
> win->notes_graph= IupBackgroundBox();
>
> IupSetCallback(win->notes_graph, "MAP_CB", (Icallback)graph_mapcb);
> IupSetCallback(win->notes_graph, "UNMAP_CB", (Icallback)graph_unmapcb);
> IupSetCallback(win->notes_graph, "RESIZE_CB", (Icallback)graph_resize);
> IupSetCallback(win->notes_graph, "BUTTON_CB", (Icallback)graph_button);
> IupSetCallback(win->notes_graph, "MOTION_CB", (Icallback)graph_motion);
> IupSetCallback(win->notes_graph, "KEYPRESS_CB",
> (Icallback)graph_keypress);
> IupSetCallback(win->notes_graph, "WHEEL_CB", (Icallback)graph_wheel);
>
> IupSetCallback(win->notes_graph, "ACTION",
> (Icallback)graph_draw_backbuffer_to_container);
>
> }
>
> int graph_mapcb(_HANDLE_PTR self)
> {
> tWIN *win = (tWIN *)IupGetAttribute(self, "WIND");
>
>
> const wchar_t CLASS_NAME[] = L"BACKBUFFER";
> WNDCLASS wc = { 0 };
> wc.lpfnWndProc = DefWindowProc;
> wc.hInstance = 0;
> wc.lpszClassName = CLASS_NAME;
> RegisterClass(&wc);
> HWND hwnd = CreateWindowEx(
> 0, // Optional window styles.
> CLASS_NAME, // Window class
> L"Learn to Program Windows", // Window text
> WS_OVERLAPPEDWINDOW, // Window style
>
> // Size and position
> CW_USEDEFAULT, CW_USEDEFAULT, win->screenWidth,
> win->screenHeight,
>
> NULL, // Parent window
> NULL, // Menu
> 0, // Instance handle
> NULL // Additional application data
> );
>
>
> win->notes_cdGraph = cdCreateCanvas(CD_NATIVEWINDOW, hwnd);
> return IUP_DEFAULT;
> }
>
> // I had to provide this signature for some reason even though I include
> cdim.h
> void cdCanvasGetImImage(cdCanvas* canvas, imImage* image, int x, int y);
>
> int graph_draw_backbuffer_to_container(_HANDLE_PTR self)
> {
> tWIN* win = (tWIN*)IupGetAttribute(self, "WIND");
> cdCanvasGetImImage(win->cdGraph, win->backbuffer, 0, 0);
> Ihandle *iupImage = IupImageFromImImage(win->backbuffer);
> IupSetHandle("BACKBUFFER", iupImage);
> IupDrawImage(win->notes_graph, "BACKBUFFER", 0, 0, win->graphWidth,
> win->graphHeight);
> IupSetHandle("BACKBUFFER", NULL);
> IupDestroy(iupImage);
> }
>
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> Iup-users@lists.sourceforge.net
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>
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