Method RenderWindowOuterBorders

lib/imgui/imgui.cpp:5102–5137

}

static void ImGui::RenderWindowOuterBorders(ImGuiWindow* window)
{
    ImGuiContext& g = *GImGui;
    float rounding = window->WindowRounding;
    float border_size = window->WindowBorderSize;
    if (border_size > 0.0f && !(window->Flags & ImGuiWindowFlags_NoBackground))
        window->DrawList->AddRect(window->Pos, window->Pos + window->Size, GetColorU32(ImGuiCol_Border), rounding, ImDrawCornerFlags_All, border_size);

    int border_held = window->ResizeBorderHeld;
    if (border_held != -1)
    {
        struct ImGuiResizeBorderDef
        {
            ImVec2 InnerDir;
            ImVec2 CornerPosN1, CornerPosN2;
            float  OuterAngle;
        };
        static const ImGuiResizeBorderDef resize_border_def[4] =
        {
            { ImVec2(0,+1), ImVec2(0,0), ImVec2(1,0), IM_PI*1.50f }, // Top
            { ImVec2(-1,0), ImVec2(1,0), ImVec2(1,1), IM_PI*0.00f }, // Right
            { ImVec2(0,-1), ImVec2(1,1), ImVec2(0,1), IM_PI*0.50f }, // Bottom
            { ImVec2(+1,0), ImVec2(0,1), ImVec2(0,0), IM_PI*1.00f }  // Left
        };
        const ImGuiResizeBorderDef& def = resize_border_def[border_held];
        ImRect border_r = GetResizeBorderRect(window, border_held, rounding, 0.0f);
        window->DrawList->PathArcTo(ImLerp(border_r.Min, border_r.Max, def.CornerPosN1) + ImVec2(0.5f, 0.5f) + def.InnerDir * rounding, rounding, def.OuterAngle - IM_PI*0.25f, def.OuterAngle);
        window->DrawList->PathArcTo(ImLerp(border_r.Min, border_r.Max, def.CornerPosN2) + ImVec2(0.5f, 0.5f) + def.InnerDir * rounding, rounding, def.OuterAngle, def.OuterAngle + IM_PI*0.25f);
        window->DrawList->PathStroke(GetColorU32(ImGuiCol_SeparatorActive), false, ImMax(2.0f, border_size)); // Thicker than usual
    }
    if (g.Style.FrameBorderSize > 0 && !(window->Flags & ImGuiWindowFlags_NoTitleBar))
    {
        float y = window->Pos.y + window->TitleBarHeight() - 1;
        window->DrawList->AddLine(ImVec2(window->Pos.x + border_size, y), ImVec2(window->Pos.x + window->Size.x - border_size, y), GetColorU32(ImGuiCol_Border), g.Style.FrameBorderSize);
    }
}

// Draw background and borders
// Draw and handle scrollbars