Merge branch 'robin-worldspace-transformation-normalised-camera' into djairo-vtk-test

vtk/.gitignore

@@ -4,3 +4,4 @@ src/.cache
 src/build
 .idea
 src/cmake-build-debug
+compile_commands.json

vtk/src/CMakeLists.txt

@@ -46,6 +46,7 @@ add_executable(VtkBase MACOSX_BUNDLE main.cpp
   commands/TimerCallbackCommand.cpp
         helperClasses/SpawnPointCallback.h
         helperClasses/SpawnPointCallback.cpp
+        helperClasses/CartographicTransformation.cpp
 )
 
 execute_process(

vtk/src/compile_commands.json

@@ -1 +0,0 @@
-build/compile_commands.json

vtk/src/helperClasses/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 double XMin = -15.875;
+    const double XMax = 12.875;
+    const double YMin = 46.125;
+    const double YMax = 62.625;
+
+    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() {
+    vtkNew<vtkTransform> transform;
+
+    transform->SetMatrix(getCartographicTransformMatrix());
+
+    vtkSmartPointer<vtkTransformFilter> transformFilter = vtkSmartPointer<vtkTransformFilter>::New();
+    transformFilter->SetTransform(transform);
+
+    return transformFilter;
+}

vtk/src/helperClasses/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();

vtk/src/helperClasses/EGlyphLayer.cpp

@@ -13,6 +13,7 @@
 #include <vtkVertexGlyphFilter.h>
 #include <netcdf>
 #include <vtkArrowSource.h>
+#include "CartographicTransformation.h"
 
 using namespace netCDF;
 using namespace std;
@@ -64,11 +65,15 @@ void EGlyphLayer::readCoordinates() {
   this->direction->SetNumberOfTuples(numLats*numLons); 
   points->Allocate(numLats*numLons);
 
+  auto camera = createNormalisedCamera();
+  ren->SetActiveCamera(camera);
+
   int i = 0;
   for (double lat : lats) {
     for (double lon : lons) {
+        cout << "lon: " << lon << " lat: " << lat << endl;
       direction->SetTuple3(i, 0.45, 0.90, 0); //FIXME: read this info from file
-      points->InsertPoint(i++, (lat*1000-46125)/25, (lon*1000+15875)/43.5, 0); // FIXME: counts on fixed window geometry to map properly; refactor to make use of active window geometry.
+      points->InsertPoint(i++, lon, lat, 0);
       // see also https://vtk.org/doc/nightly/html/classvtkPolyDataMapper2D.html
     }
   }
@@ -76,29 +81,32 @@ void EGlyphLayer::readCoordinates() {
   this->data->GetPointData()->AddArray(this->direction);
   this->data->GetPointData()->SetActiveVectors("direction");
 
+  vtkSmartPointer<vtkTransformFilter> transformFilter = createCartographicTransformFilter();
+  transformFilter->SetInputData(data);
+
   vtkNew<vtkGlyphSource2D> arrowSource;
   arrowSource->SetGlyphTypeToArrow();
-  arrowSource->SetScale(8); //TODO: set this properly
+  arrowSource->SetScale(0.2); //TODO: set this properly
   arrowSource->Update();
 
   vtkNew<vtkGlyph2D> glyph2D;
   glyph2D->SetSourceConnection(arrowSource->GetOutputPort());
-  glyph2D->SetInputData(this->data);
+  glyph2D->SetInputConnection(transformFilter->GetOutputPort());
   glyph2D->OrientOn();
   glyph2D->ClampingOn();
   glyph2D->SetScaleModeToScaleByVector(); 
   glyph2D->SetVectorModeToUseVector(); 
   glyph2D->Update();
 
-  vtkNew<vtkCoordinate> coordinate;
-  coordinate->SetCoordinateSystemToWorld();
+//  vtkNew<vtkCoordinate> coordinate;
+//  coordinate->SetCoordinateSystemToWorld();
 
-  vtkNew<vtkPolyDataMapper2D>(mapper);
+  vtkNew<vtkPolyDataMapper>(mapper);
   // mapper->SetTransformCoordinate(coordinate);
   mapper->SetInputConnection(glyph2D->GetOutputPort());
   mapper->Update();
 
-  vtkNew<vtkActor2D> actor;
+  vtkNew<vtkActor> actor;
   actor->SetMapper(mapper);
 
   actor->GetProperty()->SetColor(0,0,0);

vtk/src/helperClasses/LGlyphLayer.cpp

@@ -9,16 +9,23 @@
 #include <vtkVertexGlyphFilter.h>
 #include <vtkInteractorStyle.h>
 #include <vtkInteractorStyleUser.h>
+#include <vtkTransform.h>
+#include <vtkTransformFilter.h>
+#include <vtkPolyDataMapper.h>
+#include <vtkRenderWindow.h>
+#include <vtkCamera.h>
+
+#include "CartographicTransformation.h"
 
 
 vtkSmartPointer<SpawnPointCallback> LGlyphLayer::createSpawnPointCallback() {
     auto newPointCallBack = vtkSmartPointer<SpawnPointCallback>::New();
     newPointCallBack->setData(data);
     newPointCallBack->setPoints(points);
+    newPointCallBack->setRen(ren);
     return newPointCallBack;
 }
 
-
 // TODO: how do we handle mapping between pixelspace and lat/lon (needed for advection)? Current idea: store the vtkPoints in lat/lon system, then apply a transformfilter to map them to the current window geometry. This should allow for a changing viewport as well - we can query the new camera position and map accordingly.
 // Further notes; current thinking is to allow tracking a particle's age by using a scalar array in the VtkPolyData. This would be incremented for every tick/updateData function call.
 // Another challenge is the concept of beaching; dead particles must not be included in the advect function call (wasted computations), but they should not be outright deleted from the vtkPoints either (we still want to display them). Working Solution: have another array of ints in the vtkPolyData, which tracks for how many calls of UpdateData a given particle has not had its position changed. If this int reaches some treshold (5? 10? 3? needs some testing), exclude the particle from the advect call.
@@ -26,74 +33,64 @@ vtkSmartPointer<SpawnPointCallback> LGlyphLayer::createSpawnPointCallback() {
 // TODO: modelling all this in vtkClasses is workable, but ideally i would want to work with a native C++ class. See if this is doable and feasible.
 
 LGlyphLayer::LGlyphLayer() {
-  this->ren = vtkSmartPointer<vtkRenderer>::New();
-  this->ren->SetLayer(2);
+    this->ren = vtkSmartPointer<vtkRenderer>::New();
+    this->ren->SetLayer(2);
 
-  this->points = vtkSmartPointer<vtkPoints>::New();
-  this->data = vtkSmartPointer<vtkPolyData>::New();
-  this->data->SetPoints(this->points);
+    this->points = vtkSmartPointer<vtkPoints>::New();
+    this->data = vtkSmartPointer<vtkPolyData>::New();
+    this->data->SetPoints(this->points);
 
-  vtkNew<vtkGlyphSource2D> circleSource;
-  circleSource->SetGlyphTypeToCircle();
-  circleSource->SetScale(15); 
-  circleSource->Update();
+    auto camera = createNormalisedCamera();
+    ren->SetActiveCamera(camera);
 
-  vtkNew<vtkGlyph2D> glyph2D;
-  glyph2D->SetSourceConnection(circleSource->GetOutputPort());
-  glyph2D->SetInputData(this->data);
-  glyph2D->SetColorModeToColorByScalar();
-  glyph2D->Update();
+    auto transform = createCartographicTransformFilter();
 
-  vtkNew<vtkPolyDataMapper2D> mapper;
-  mapper->SetInputConnection(glyph2D->GetOutputPort());
-  mapper->Update();
+    vtkSmartPointer<vtkTransformFilter> transformFilter = createCartographicTransformFilter();
+    transformFilter->SetInputData(data);
 
-  vtkNew<vtkActor2D> actor;
-  actor->SetMapper(mapper);
-  actor->GetProperty()->SetColor(1,1,1);
+    vtkNew<vtkGlyphSource2D> circleSource;
+    circleSource->SetGlyphTypeToCircle();
+    circleSource->SetScale(0.05);
+    circleSource->Update();
 
-  this->ren->AddActor(actor);
+    vtkNew<vtkGlyph2D> glyph2D;
+    glyph2D->SetSourceConnection(circleSource->GetOutputPort());
+    glyph2D->SetInputConnection(transformFilter->GetOutputPort());
+    glyph2D->SetColorModeToColorByScalar();
+    glyph2D->Update();
+
+    vtkNew<vtkPolyDataMapper> mapper;
+    mapper->SetInputConnection(glyph2D->GetOutputPort());
+    mapper->Update();
+
+    vtkNew<vtkActor> actor;
+    actor->SetMapper(mapper);
+
+    this->ren->AddActor(actor);
 }
 
 // creates a few points so we can test the updateData function
 void LGlyphLayer::spoofPoints() {
-  this->points->InsertNextPoint(53, 2, 0);
-  this->points->InsertNextPoint(48.2, 111.01, 0);
-  this->points->InsertNextPoint(331, 331, 0);
+    this->points->InsertNextPoint(-4.125, 61.375 , 0);
+    this->points->InsertNextPoint(6.532949683882039, 53.24308582564463, 0); // Coordinates of Zernike
+    this->points->InsertNextPoint(5.315307819255385, 60.40001057122271, 0); // Coordinates of Bergen
+    this->points->InsertNextPoint( 6.646210231365825, 46.52346296009023, 0); // Coordinates of Lausanne
+    this->points->InsertNextPoint(-6.553894313570932, 62.39522131195857, 0); // Coordinates of the top of the Faroe islands
 
-  this->points->Modified();
+    this->points->Modified();
 }
 
-
 // returns new coords for a point; used to test the updateData function
 std::pair<double, double> advect(int time, double lat, double lon) {
-  return {lat+0.1, lon+0.1} ;
+    return {lat + 0.01, lon + 0.01};
 }
 
-
-// converts a x,y pair from pixel coordinates to real world latitude and longitude.
-// TODO: make this more modular by having it interact with the backgroundImage layer (and possibly the camera panning/zooming logic when that is implemented).
-std::pair<double, double> pixelToReal(double x, double y) {
-  //assumes a 661x661 window with a range of [46.125, 62.625] lat and [-15.875, 12.875] lon.
-  return {(x*25+46125)/1000, (y*43.5-15875)/1000};
-}
-
-// converts a lat,lon pair from real world values to pixel coordinates.
-// TODO: see above.
-std::pair<double, double> realToPixel(double lat, double lon) {
-  //assumes a 661x661 window with a range of [46.125, 62.625] lat and [-15.875, 12.875] lon.
-  return {(lat*1000-46125)/25, (lon*1000+15875)/43.5};
-}
-
-// FIXME: actually the above functions are a bit of a naive way of modelling these. Much better would be to have the points at the real-world latitude and longitude, and apply a filter in the pipeline to convert them to the appropriate window geometry.
- void LGlyphLayer::updateData(int t) {
-  double point[3];
-  for (vtkIdType n=0; n < this->points->GetNumberOfPoints(); n++) {
-    this->points->GetPoint(n, point);
-    auto grads = pixelToReal(point[0], point[1]);
-    auto newGrads = advect(n, grads.first, grads.second);
-    auto newPixs = realToPixel(newGrads.first, newGrads.second);
-    this->points->SetPoint(n, newPixs.first, newPixs.second, 0);
-  }
-  this->points->Modified();
+void LGlyphLayer::updateData(int t) {
+    double point[3];
+    for (vtkIdType n = 0; n < this->points->GetNumberOfPoints(); n++) {
+        this->points->GetPoint(n, point);
+        auto [xNew, yNew] = advect(n, point[0], point[1]);
+        this->points->SetPoint(n, xNew, yNew, 0);
+    }
+    this->points->Modified();
 }

vtk/src/helperClasses/SpawnPointCallback.cpp

@@ -7,6 +7,8 @@
 #include <vtkCommand.h>
 #include <vtkRenderWindow.h>
 
+#include "CartographicTransformation.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);
@@ -31,7 +33,15 @@ void SpawnPointCallback::Execute(vtkObject *caller, unsigned long evId, void *ca
     int x, y;
     interactor->GetEventPosition(x, y);
 
-    vtkIdType id = points->InsertNextPoint(x, y, 0);
+    double worldPos[4] = {2, 0 ,0, 0};
+    double displayPos[3] = {static_cast<double>(x), static_cast<double>(y), 0.0};
+    ren->SetDisplayPoint(displayPos);
+    ren->DisplayToWorld();
+    ren->GetWorldPoint(worldPos);
+    inverseCartographicProjection->MultiplyPoint(worldPos, worldPos);
+    cout << "clicked on lon = " << worldPos[0] << " and lat = " << worldPos[1] << endl;
+
+    vtkIdType id = points->InsertNextPoint(worldPos[0], worldPos[1], 0);
     data->SetPoints(points);
 
     vtkSmartPointer<vtkVertex> vertex = vtkSmartPointer<vtkVertex>::New();
@@ -45,7 +55,10 @@ void SpawnPointCallback::Execute(vtkObject *caller, unsigned long evId, void *ca
 }
 
 
-SpawnPointCallback::SpawnPointCallback() : data(nullptr), points(nullptr) {}
+SpawnPointCallback::SpawnPointCallback() : data(nullptr), points(nullptr), inverseCartographicProjection(nullptr) {
+    inverseCartographicProjection = getCartographicTransformMatrix();
+    inverseCartographicProjection->Invert();
+}
 
 SpawnPointCallback *SpawnPointCallback::New() {
     return new SpawnPointCallback;
@@ -58,3 +71,7 @@ void SpawnPointCallback::setData(const vtkSmartPointer<vtkPolyData> &data) {
 void SpawnPointCallback::setPoints(const vtkSmartPointer<vtkPoints> &points) {
     this->points = points;
 }
+
+void SpawnPointCallback::setRen(const vtkSmartPointer<vtkRenderer> &ren) {
+    this->ren = ren;
+}

vtk/src/helperClasses/SpawnPointCallback.h

@@ -6,6 +6,7 @@
 #include <vtkRenderWindowInteractor.h>
 #include <vtkPoints.h>
 #include <vtkPolyData.h>
+#include <vtkMatrix4x4.h>
 
 class SpawnPointCallback : public vtkCallbackCommand {
 
@@ -17,12 +18,13 @@ public:
 
     void setData(const vtkSmartPointer<vtkPolyData> &data);
 
+    void setRen(const vtkSmartPointer<vtkRenderer> &ren);
 private:
     vtkSmartPointer<vtkPolyData> data;
     vtkSmartPointer<vtkPoints> points;
-public:
+    vtkSmartPointer<vtkRenderer> ren;
+    vtkSmartPointer<vtkMatrix4x4> inverseCartographicProjection;
 
-private:
     void Execute(vtkObject *caller, unsigned long evId, void *callData) override;
     bool dragging = false;
 };