diff --git a/src/src/measure/ReferenceLineLegendActor.cpp b/src/src/measure/ReferenceLineLegendActor.cpp
new file mode 100644
index 0000000..fd46bdf
--- /dev/null
+++ b/src/src/measure/ReferenceLineLegendActor.cpp
@@ -0,0 +1,61 @@
+//
+// Created by Krad on 2022/4/11.
+//
+
+#include "ReferenceLineLegendActor.h"
+#include <vtkObjectFactory.h>
+#include "vtkPolyDataMapper2D.h"
+#include "vtkRenderer.h"
+#include "vtkRenderWindow.h"
+#include "vtkCamera.h"
+#include "vtkPoints.h"
+#include "vtkProperty2D.h"
+
+vtkStandardNewMacro(ReferenceLineLegendActor)
+
+void ReferenceLineLegendActor::BuildShape(vtkRenderer* renderer) {
+    //reference line 暂时不用考虑缩放问题
+    vtkNew<vtkPoints> pts;
+    vtkNew<vtkCellArray> lines;
+    vtkIdType ids[2]={0,1};
+    double p[3] = {.0, .0, .0};
+    renderer->SetWorldPoint(linePoints->GetPoint(0));
+    renderer->WorldToDisplay();
+    renderer->GetDisplayPoint(p);
+    ids[0] = pts->InsertNextPoint(p);
+    renderer->SetWorldPoint(linePoints->GetPoint(1));
+    renderer->WorldToDisplay();
+    renderer->GetDisplayPoint(p);
+    ids[1] = pts->InsertNextPoint(0,2.5,0.0);
+    lines->InsertNextCell(2,ids);
+
+    renderData->SetPoints(pts);
+    renderData->SetLines(lines);
+    actor2D->GetMapper()->SetInputDataObject(renderData);
+}
+
+void ReferenceLineLegendActor::ReleaseGraphicsResources(vtkWindow * iwin) {
+    actor2D->ReleaseGraphicsResources(iwin);
+}
+
+int ReferenceLineLegendActor::RenderOverlay(vtkViewport *viewport) {
+    auto renderer = vtkRenderer::SafeDownCast(viewport);
+    if (!renderer) return 0;
+    BuildShape(renderer);
+    return actor2D->RenderOverlay(viewport);
+}
+
+ReferenceLineLegendActor::ReferenceLineLegendActor() {
+    this->PickableOff();
+    actor2D = vtkActor2D::New();
+    actor2D->PickableOff();
+    vtkNew<vtkPolyDataMapper2D> mapper;
+    actor2D->SetMapper(mapper);
+    actor2D->GetProperty()->SetLineWidth(1.0);
+    actor2D->GetProperty()->SetColor(1.0,0.0,0.0);
+}
+
+ReferenceLineLegendActor::~ReferenceLineLegendActor() {
+    actor2D->Delete();
+    actor2D = nullptr;
+}
diff --git a/src/src/measure/ReferenceLineLegendActor.h b/src/src/measure/ReferenceLineLegendActor.h
new file mode 100644
index 0000000..38cd61c
--- /dev/null
+++ b/src/src/measure/ReferenceLineLegendActor.h
@@ -0,0 +1,73 @@
+//
+// Created by Krad on 2022/4/11.
+//
+
+#ifndef OMEGAV_REFERENCELINELEGENDACTOR_H
+#define OMEGAV_REFERENCELINELEGENDACTOR_H
+
+#include "vtkProp.h"
+#include "vtkActor2D.h"
+#include "vtkPolyData.h"
+#include "vtkNew.h" // for ivars
+class vtkRenderer;
+class ReferenceLineLegendActor : public vtkProp {
+public:
+    //@{
+    /**
+     * Standard methods for instances of this class.
+     */
+    static ReferenceLineLegendActor *New();
+
+    vtkTypeMacro(ReferenceLineLegendActor, vtkProp);
+
+    virtual void BuildShape(vtkRenderer* renderer);
+
+    //@{
+    /**
+     * Methods to make this class behave as a vtkProp.
+     */
+    double *GetBounds() VTK_SIZEHINT(6) override { return nullptr; }
+
+    void GetActors(vtkPropCollection *) override {}
+
+    void GetVolumes(vtkPropCollection *) override {}
+
+    void ShallowCopy(vtkProp *prop) override {};
+
+    void ReleaseGraphicsResources(vtkWindow *) override;
+
+    /**
+     * Method use to make this actor render in 2D scene;
+     * @param viewport
+     * @return render is success
+     */
+    int RenderOverlay(vtkViewport *viewport) override;
+
+    int RenderOpaqueGeometry(vtkViewport *vtkNotUsed(viewport)) override { return 0; }
+
+    int RenderTranslucentPolygonalGeometry(vtkViewport *vtkNotUsed(viewport)) override { return 0; }
+
+    int RenderVolumetricGeometry(vtkViewport *vtkNotUsed(viewport)) override { return 0; }
+
+    vtkTypeBool HasTranslucentPolygonalGeometry() override { return 0; }
+
+    void SetLinePoint(double* p1, double* p2){
+         linePoints->SetNumberOfPoints(2);
+         linePoints->SetPoint(0, p1);
+         linePoints->SetPoint(2, p2);
+    }
+
+protected:
+    ReferenceLineLegendActor();
+    ~ReferenceLineLegendActor() override;
+    vtkNew<vtkPoints> linePoints;
+    vtkNew<vtkPolyData> renderData;
+    vtkActor2D * actor2D;
+
+private:
+    ReferenceLineLegendActor(const ReferenceLineLegendActor &) = delete;
+    void operator=(const ReferenceLineLegendActor &) = delete;
+};
+
+
+#endif //OMEGAV_REFERENCELINELEGENDACTOR_H