renamed and stuff

particle-track-and-trace/src/CartographicTransformation.cpp

@@ -0,0 +1,46 @@
+#include "CartographicTransformation.h"
+#include <vtkMatrix4x4.h>
+#include <vtkTransform.h>
+#include <vtkTransformFilter.h>
+
+vtkSmartPointer<vtkCamera> createNormalisedCamera() {
+    vtkSmartPointer<vtkCamera> camera = vtkSmartPointer<vtkCamera>::New();
+    camera->ParallelProjectionOn();  // Enable parallel projection
+
+    camera->SetPosition(0, 0, 1000);  // Place the camera above the center
+    camera->SetFocalPoint(0, 0, 0);  // Look at the center
+    camera->SetViewUp(0, 1, 0); // Set the up vector to be along the Y-axis
+    camera->SetParallelScale(1); // x,y in [-1, 1]
+
+    return camera;
+}
+
+vtkSmartPointer<vtkMatrix4x4> getCartographicTransformMatrix(const std::shared_ptr<UVGrid> uvGrid) {
+    const double XMin = uvGrid->lons.front();
+    const double XMax = uvGrid->lons.back();
+    const double YMin = uvGrid->lats.front();
+    const double YMax = uvGrid->lats.back();
+
+    double eyeTransform[] = {
+            2/(XMax-XMin), 0, 0, -(XMax+XMin)/(XMax-XMin),
+            0, 2/(YMax-YMin), 0, -(YMax+YMin)/(YMax-YMin),
+            0, 0, 1, 0,
+            0, 0, 0, 1
+    };
+
+    auto matrix = vtkSmartPointer<vtkMatrix4x4>::New();
+    matrix->DeepCopy(eyeTransform);
+    return matrix;
+}
+
+// Assumes Normalised camera is used
+vtkSmartPointer<vtkTransformFilter> createCartographicTransformFilter(const std::shared_ptr<UVGrid> uvGrid) {
+    vtkNew<vtkTransform> transform;
+
+    transform->SetMatrix(getCartographicTransformMatrix(uvGrid));
+
+    vtkSmartPointer<vtkTransformFilter> transformFilter = vtkSmartPointer<vtkTransformFilter>::New();
+    transformFilter->SetTransform(transform);
+
+    return transformFilter;
+}