Method TreeNodeDrawLineToChildNode

src/imgui/imgui_widgets.cpp:7038–7065

Draw horizontal line from our parent node This is only called for visible child nodes so we are not too fussy anymore about performances

// Draw horizontal line from our parent node
// This is only called for visible child nodes so we are not too fussy anymore about performances
void ImGui::TreeNodeDrawLineToChildNode(const ImVec2& target_pos)
{
    ImGuiContext& g = *GImGui;
    ImGuiWindow* window = g.CurrentWindow;
    if (window->DC.TreeDepth == 0 || (window->DC.TreeHasStackDataDepthMask & (1 << (window->DC.TreeDepth - 1))) == 0)
        return;

    ImGuiTreeNodeStackData* parent_data = &g.TreeNodeStack.Data[g.TreeNodeStack.Size - 1];
    float x1 = ImTrunc(parent_data->DrawLinesX1);
    float x2 = ImTrunc(target_pos.x - g.Style.ItemInnerSpacing.x);
    float y = ImTrunc(target_pos.y);
    float rounding = (g.Style.TreeLinesRounding > 0.0f) ? ImMin(x2 - x1, g.Style.TreeLinesRounding) : 0.0f;
    parent_data->DrawLinesToNodesY2 = ImMax(parent_data->DrawLinesToNodesY2, y - rounding);
    if (x1 >= x2)
        return;
    if (rounding > 0.0f)
    {
        x1 += 0.5f + rounding;
        window->DrawList->PathArcToFast(ImVec2(x1, y - rounding), rounding, 6, 3);
        if (x1 < x2)
            window->DrawList->PathLineTo(ImVec2(x2, y));
        window->DrawList->PathStroke(GetColorU32(ImGuiCol_TreeLines), ImDrawFlags_None, g.Style.TreeLinesSize);
    }
    else
    {
        window->DrawList->AddLine(ImVec2(x1, y), ImVec2(x2, y), GetColorU32(ImGuiCol_TreeLines), g.Style.TreeLinesSize);
    }
}

// Draw vertical line of the hierarchy
void ImGui::TreeNodeDrawLineToTreePop(const ImGuiTreeNodeStackData* data)