fix: stylistic changes + addObservers

vtk/src/layers/Layer.h

@@ -0,0 +1,32 @@
+#ifndef LAYER_H
+#define LAYER_H
+
+#include <vtkInteractorStyle.h>
+#include <vtkRenderer.h>
+
+/** This class represents one abstract layer to be rendered to VTK.
+  * It exists to manage multiple different layers under the Program class.
+  */
+class Layer {
+protected:
+  vtkSmartPointer<vtkRenderer> ren;
+
+public:
+  /** gets the vtkRenderer to assign it to the vtkRenderWindow of the program class.
+   * @return pointer to the vtkRenderer of this class.
+   */
+  virtual vtkSmartPointer<vtkRenderer> getLayer();
+
+
+  /** updates the data in the layer to reflect the given timestamp.
+    * @param t : the timestamp which the data should reflect.
+    */
+  virtual void updateData(int t);
+
+  /** Adds an observer to the renderWindowinteractor within which this layer is active.
+    * @param interactor : pointer to the interactor that observers can be added to.
+    */
+  virtual void addObservers(vtkSmartPointer<vtkRenderWindowInteractor> interactor);
+};
+
+#endif