GeoAssignCoordinates

VTKExamples/Cxx/Geovis/GeoAssignCoordinates


Description

Note

The vtkGeovisCore classes as well as the module vtkViewsGeovis have been deprecated for VTK 8.2 and will be removed in a future version. See VTK Merge Request 4395

Other Languages

See (Python), (Java)

Question

If you have a simple question about this example contact us at VTKExamplesProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

Code

GeoAssignCoordinates.cxx

#include <vtkSmartPointer.h>

#include <vtkDataSetAttributes.h>
#include <vtkGeoAssignCoordinates.h>
#include <vtkDoubleArray.h>
#include <vtkGraphMapper.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkMutableDirectedGraph.h>

int main(int, char* [])
{

  vtkSmartPointer<vtkMutableDirectedGraph> g =
    vtkSmartPointer<vtkMutableDirectedGraph>::New();

  vtkSmartPointer<vtkDoubleArray> latitude =
    vtkSmartPointer<vtkDoubleArray>::New();
  latitude->SetName("latitude");

  vtkSmartPointer<vtkDoubleArray> longitude =
    vtkSmartPointer<vtkDoubleArray>::New();
  longitude->SetName("longitude");

  for(int lat = -90; lat <= 90; lat += 10)
  {
    for(int lon = -180; lon <= 180; lon += 20)
    {
      g->AddVertex();
      latitude->InsertNextValue(lat);
      longitude->InsertNextValue(lon);
    }
  }

  g->GetVertexData()->AddArray(latitude);
  g->GetVertexData()->AddArray(longitude);

  vtkSmartPointer<vtkGeoAssignCoordinates> assign =
    vtkSmartPointer<vtkGeoAssignCoordinates>::New();
  assign->SetInputData(g);
  assign->SetLatitudeArrayName("latitude");
  assign->SetLongitudeArrayName("longitude");
  assign->SetGlobeRadius(1.0);
  assign->Update();

  vtkSmartPointer<vtkGraphMapper> mapper =
    vtkSmartPointer<vtkGraphMapper>::New();
  mapper->SetInputConnection(assign->GetOutputPort());
  vtkSmartPointer<vtkActor> actor =
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);

  vtkSmartPointer<vtkRenderer> ren =
    vtkSmartPointer<vtkRenderer>::New();
  ren->AddActor(actor);

  vtkSmartPointer<vtkRenderWindowInteractor> iren =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();

  vtkSmartPointer<vtkRenderWindow> win =
    vtkSmartPointer<vtkRenderWindow>::New();
  win->AddRenderer(ren);
  win->SetInteractor(iren);
  ren->ResetCamera();

  win->Render();
  iren->Initialize();
  iren->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(GeoAssignCoordinates)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkCommonDataModel
  vtkGeovisCore
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping GeoAssignCoordinates: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  add_executable(GeoAssignCoordinates MACOSX_BUNDLE GeoAssignCoordinates.cxx )
  target_link_libraries(GeoAssignCoordinates PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(GeoAssignCoordinates MACOSX_BUNDLE GeoAssignCoordinates.cxx )
  target_link_libraries(GeoAssignCoordinates PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS GeoAssignCoordinates
    MODULES ${VTK_LIBRARIES}
    )
endif () 

Download and Build GeoAssignCoordinates

Click here to download GeoAssignCoordinates and its CMakeLists.txt file. Once the tarball GeoAssignCoordinates.tar has been downloaded and extracted,

cd GeoAssignCoordinates/build 

If VTK is installed:

cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

make

and run it:

./GeoAssignCoordinates

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.