spawning points

vtk/src/helperClasses/SpawnPointCallback.cpp

@@ -0,0 +1,60 @@
+#include "SpawnPointCallback.h"
+
+#include <vtkVertex.h>
+#include <vtkRenderer.h>
+#include <vtkRenderWindowInteractor.h>
+#include <vtkSmartPointer.h>
+#include <vtkCommand.h>
+#include <vtkRenderWindow.h>
+
+void convertDisplayToWorld(vtkRenderer* renderer, int x, int y, double *worldPos) {
+    double displayPos[3] = {static_cast<double>(x), static_cast<double>(y), 0.0};
+    renderer->SetDisplayPoint(displayPos);
+    renderer->DisplayToWorld();
+    renderer->GetWorldPoint(worldPos);
+}
+
+void SpawnPointCallback::Execute(vtkObject *caller, unsigned long evId, void *callData) {
+    // Note the use of reinterpret_cast to cast the caller to the expected type.
+    auto interactor = reinterpret_cast<vtkRenderWindowInteractor *>(caller);
+
+    if (evId == vtkCommand::LeftButtonPressEvent) {
+        dragging = true;
+    }
+    if (evId == vtkCommand::LeftButtonReleaseEvent) {
+        dragging = false;
+    }
+    if (!dragging) {
+        return;
+    }
+
+    int x, y;
+    interactor->GetEventPosition(x, y);
+
+    vtkIdType id = points->InsertNextPoint(x, y, 0);
+    data->SetPoints(points);
+
+    vtkSmartPointer<vtkVertex> vertex = vtkSmartPointer<vtkVertex>::New();
+    vertex->GetPointIds()->SetId(0, id);
+
+    vtkSmartPointer<vtkCellArray> vertices = vtkSmartPointer<vtkCellArray>::New();
+    vertices->InsertNextCell(vertex);
+    data->SetVerts(vertices);
+//    data->Modified(); // These might be needed im not sure.
+//    ren->GetRenderWindow()->Render();
+}
+
+
+SpawnPointCallback::SpawnPointCallback() : data(nullptr), points(nullptr) {}
+
+SpawnPointCallback *SpawnPointCallback::New() {
+    return new SpawnPointCallback;
+}
+
+void SpawnPointCallback::setData(const vtkSmartPointer<vtkPolyData> &data) {
+    this->data = data;
+}
+
+void SpawnPointCallback::setPoints(const vtkSmartPointer<vtkPoints> &points) {
+    this->points = points;
+}