fix: stylistic changes + addObservers

vtk/src/CartographicTransformation.h

@@ -0,0 +1,30 @@
+#include <vtkCamera.h>
+#include <vtkTransformFilter.h>
+
+#ifndef VTKBASE_NORMALISEDCARTOGRAPHICCAMERA_H
+#define VTKBASE_NORMALISEDCARTOGRAPHICCAMERA_H
+
+#endif //VTKBASE_NORMALISEDCARTOGRAPHICCAMERA_H
+
+/**
+ * Constructs a orthographically projected camera that looks at the square x,y in [-1, 1] with z = 0 and w = 1.
+ * The space [-1,1] x [-1,1] x {0} will be referred to as the normalised space.
+ * @return pointer to camera
+ */
+vtkSmartPointer<vtkCamera> createNormalisedCamera();
+
+/**
+ * Constructs a 4x4 projection matrix that maps homogenious (longitude, latitude, 0, 1) points
+ * to the normalised space.
+ * TODO: This will soon require UVGrid as a parameter after the advection code is merged properly.
+ * TODO: This transformation has room for improvement see:
+ * https://github.com/MakeNEnjoy/interactive-track-and-trace/issues/12
+ * @return pointer to 4x4 matrix
+ */
+vtkSmartPointer<vtkMatrix4x4> getCartographicTransformMatrix();
+
+/**
+ * Convenience function that converts the 4x4 projection matrix into a vtkTransformFilter
+ * @return pointer to transform filter
+ */
+vtkSmartPointer<vtkTransformFilter> createCartographicTransformFilter();