feat (wip): implementing camera zooming and panning functionality

vtk/src/commands/CameraMoveCallback.h

@@ -0,0 +1,27 @@
+#ifndef VTKBASE_CAMERAMOVECALLBACK_H
+#define VTKBASE_CAMERAMOVECALLBACK_H
+
+
+#include <vtkCallbackCommand.h>
+#include <vtkCamera.h>
+#include <vtkRenderWindowInteractor.h>
+#include <vtkMatrix4x4.h>
+
+class CameraMoveCallback : public vtkCallbackCommand {
+
+public:
+    static CameraMoveCallback *New(vtkCamera *cam);
+    CameraMoveCallback();
+
+    void setCam(const vtkSmartPointer<vtkCamera> &cam);
+
+private:
+    vtkSmartPointer<vtkCamera> cam;
+
+    void Execute(vtkObject *caller, unsigned long evId, void *callData) override;
+    void zoom(const bool in);
+    void pan(const std::string dir);
+};
+
+
+#endif