implot context menu inside node editor

[Analysiszaj]

Version/Branch:

latest

Back-ends:

glfw + openGL

Compiler, OS:

macOS + clang17

Details:

I downloaded the latest one imgui-bundle, I tried using the demo 'sandbox_plot_in_node.cpp' below, I found that when I right-click to open the pop-up box of the chart, it shows strange cropping, and sometimes a part is missing。

Minimal, Complete and Verifiable Example code:

Based on sandbox_plot_in_node.cpp

void gui()
{
    static ImVec2 plotSize(200, 200);
    static ImVec2 plotSize2(200, 200);
    static double xPos = 5.f;

    auto myPlotFunction = []()
    {
        static std::vector<float> x(1000), y(1000);
        for (int i = 0; i < 1000; ++i)
        {
            x[i] = i * 0.01f;
            y[i] = sin(x[i]);
        }
        ImPlot::PlotLine("My Line", x.data(), y.data(), 1000);
        ImPlot::DragLineX(0, &xPos, ImVec4(1, 1, 0, 1));
    };

    auto myPlotFunction2 = []()
    {
        static std::vector<float> x(1000), y(1000);
        for (int i = 0; i < 1000; ++i)
        {
            x[i] = i * 0.01f;
            y[i] = sin(x[i]);
        }
        ImPlot::PlotLine("My Line", x.data(), y.data(), 1000);
        ImPlot::DragLineX(0, &xPos, ImVec4(1, 1, 0, 1));
    };

    ed::Begin("My Node Editor");
    ed::BeginNode(ed::NodeId(1));
    ImGui::Text("Hello");
    ImGui::Text("World");
    plotSize = ImmApp::ShowResizablePlotInNodeEditor("My Plot", plotSize, myPlotFunction);
    ed::EndNode();

    ed::BeginNode(ed::NodeId(2));
    ImGui::Text("Hello");
    ImGui::Text("World");
    plotSize2 = ImmApp::ShowResizablePlotInNodeEditor("My Plot2", plotSize2, myPlotFunction2);
    ed::EndNode();

    ed::End();
}

PixPin_2025-10-29_13-37-09.mp4

Finally, Thank you for this amazing library!

[pthom]

Hello,

This issue is due to imgui-node-editor: popups may cause issue inside the node editor (and the context menu is rendered inside a popup).

See related imgui-node-editor issue: thedmd/imgui-node-editor#242

ImGui Bundle addresses most of the issues by applying patches described in this issue, however this particular render issue is not easy to solve.

[Analysiszaj]

Hello, I have recently tried to fix this issue.
First of all, I'm very grateful for the information you provided. It's very useful to me.
I tried using fiatlinght and found that apart from the rendering issue,implot also has the following problems when used in node-editor:

1. Press the mouse outside the chart and then slide to the chart, and the chart will respond to the interaction.
   2.The interaction events of x-axis and y-axis have been discarded.
   3.Pressing and dragging the chart area within the chart will cause the node positions to flash.

As shown in the video:

PixPin_2025-12-19_18-27-13.mp4

I carefully read the fix of imgui_bundle and also looked at the source code of node-editor.It seems that the node-editor might have preempted the implot event, specifically ined::EditorContext::End() function.

I applied the following fixes to this:

// Add variables in the context
// imgui_node_editor_internal.h
struct EditorContext{
  void setDisable(bool disable) { isDisable = disable; }
 bool isDisable = false;
...
};

// Add a judgment in the method
// imgui_node_editor.cpp
void ed::EditorContext::End()
{
    //auto& io          = ImGui::GetIO();
    auto control = ed::Control();
    m_IsHoveredWithoutOverlapp = false;
    m_IsHovered = false;
    if(!isDisable)
    {
        control     = BuildControl(m_CurrentAction && m_CurrentAction->IsDragging());
    }
...
}

Then use it to disable by determining whether the mouse hovers over the Plot:

namespace ed = ax::NodeEditor;
void Node::render()
{

  ed::BeginNode(mId);
  ImGui::PushID(mId);
  if (ImGui::Button("测试图表", ImVec2(300, 20)))
  {
  }
  if (mPlot)
    mPlot->render();

  // bool pressed = ImGui::ButtonBehavior(bb, mId, &hover, &held, ImGuiButtonFlags_AllowOverlap);
  if(ImGui::IsItemHovered())
  {
    ed::SetDisable(true);
    ImGui::Text("Hovered");
  }
  else 
  {
    ed::SetDisable(false);
  }
  ImGui::Text("%d", ImGui::GetActiveID());

  // ImGui::ButtonBehavior()

  ImGui::Text("Node A");
  ed::BeginPin(mId + 1, ed::PinKind::Input);
  ImGui::Text("-> In");
  ed::EndPin();
  ImGui::SameLine();
  ed::BeginPin(mId + 2, ed::PinKind::Output);
  ImGui::Text("Out ->");
  ed::EndPin();
  ImGui::PopID();
  ed::EndNode();
}

This is the current effect:

PixPin_2025-12-19_19-44-53.mp4

implot can be used perfectly.
Hope this can be of help to you, Regarding the rendering issue, I'm still trying.

[pthom]

Thanks a lot! I am on holiday and will look at this in January