Draw graphics in the background

[Riccsson]

Hi.

Have used:

auto globalDrawlist = ImGui::GetOverlayDrawList();
globalDrawlist->AddRectFilled(pos1, pos2, ThemeColors.WindowBackground, 8.0f);

and so on to draw some loading progress bar and status in front of everything.

But now I am trying to draw some rectangles and circles in the main background but have no clue how to do that. I was trying something like this:

ImDrawList drawList(ImGui::GetDrawListSharedData());
drawList.AddRectFilledMultiColor(ImVec2(), ImGui::GetIO().DisplaySize, ThemeColors.MainBackground1, ThemeColors.MainBackground2, ThemeColors.MainBackground3, ThemeColors.MainBackground4); ImGui::AddDrawList(&drawList);

But I cant get it to work. Is there anyone how know how to do that? Thanks

[ocornut]

There's no function called ImGui::AddDrawList(&drawList); in imgui so you seem to be omitting information from your use case.

Indeed you need to be rendering this draw list in your render function.
You may just construct a ImDrawData structure and call your render function twice, that would be the easiest way at the moment.

This is a fairly common request so I may just go and add a helper GetBackgroundDrawList() function. I was hesitant with adding it because the GetOverlayDrawlist() function doesnt' have a trivial 1-to-1 equivalent in the multi-viewport branch, but think this already needs to be solved for GetOverlayDrawlist I may add the new function anyway.

[ocornut]

@Riccsson I have added a GetBackgroundDrawList() function now.
And GetOverlayDrawList() was renamed to GetForegroundDrawList() for consistency.

[Riccsson]

Work greats! Thanks!