ScatterPlot
VTKExamples/Cxx/Plotting/ScatterPlot
Code¶
ScatterPlot.cxx
#include <vtkVersion.h> #include <vtkSmartPointer.h> #include <vtkChartXY.h> #include <vtkContextScene.h> #include <vtkContextView.h> #include <vtkFloatArray.h> #include <vtkPlotPoints.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkRenderer.h> #include <vtkTable.h> int main(int, char*[]) { // Set up a 2D scene, add an XY chart to it vtkSmartPointer<vtkContextView> view = vtkSmartPointer<vtkContextView>::New(); view->GetRenderer()->SetBackground(1.0, 1.0, 1.0); view->GetRenderWindow()->SetSize(400, 300); vtkSmartPointer<vtkChartXY> chart = vtkSmartPointer<vtkChartXY>::New(); view->GetScene()->AddItem(chart); chart->SetShowLegend(true); // Create a table with some points in it... vtkSmartPointer<vtkTable> table = vtkSmartPointer<vtkTable>::New(); vtkSmartPointer<vtkFloatArray> arrX = vtkSmartPointer<vtkFloatArray>::New(); arrX->SetName("X Axis"); table->AddColumn(arrX); vtkSmartPointer<vtkFloatArray> arrC = vtkSmartPointer<vtkFloatArray>::New(); arrC->SetName("Cosine"); table->AddColumn(arrC); vtkSmartPointer<vtkFloatArray> arrS = vtkSmartPointer<vtkFloatArray>::New(); arrS->SetName("Sine"); table->AddColumn(arrS); vtkSmartPointer<vtkFloatArray> arrT = vtkSmartPointer<vtkFloatArray>::New(); arrT->SetName("Sine - Cosine"); table->AddColumn(arrT); // Test charting with a few more points... int numPoints = 40; float inc = 7.5 / (numPoints-1); table->SetNumberOfRows(numPoints); for (int i = 0; i < numPoints; ++i) { table->SetValue(i, 0, i * inc); table->SetValue(i, 1, cos(i * inc) + 0.0); table->SetValue(i, 2, sin(i * inc) + 0.0); table->SetValue(i, 3, sin(i * inc) - cos(i * inc)); } // Add multiple scatter plots, setting the colors etc vtkPlot *points = chart->AddPlot(vtkChart::POINTS); #if VTK_MAJOR_VERSION <= 5 points->SetInput(table, 0, 1); #else points->SetInputData(table, 0, 1); #endif points->SetColor(0, 0, 0, 255); points->SetWidth(1.0); vtkPlotPoints::SafeDownCast(points)->SetMarkerStyle(vtkPlotPoints::CROSS); points = chart->AddPlot(vtkChart::POINTS); #if VTK_MAJOR_VERSION <= 5 points->SetInput(table, 0, 2); #else points->SetInputData(table, 0, 2); #endif points->SetColor(0, 0, 0, 255); points->SetWidth(1.0); vtkPlotPoints::SafeDownCast(points)->SetMarkerStyle(vtkPlotPoints::PLUS); points = chart->AddPlot(vtkChart::POINTS); #if VTK_MAJOR_VERSION <= 5 points->SetInput(table, 0, 3); #else points->SetInputData(table, 0, 3); #endif points->SetColor(0, 0, 255, 255); points->SetWidth(1.0); vtkPlotPoints::SafeDownCast(points)->SetMarkerStyle(vtkPlotPoints::CIRCLE); //Finally render the scene view->GetRenderWindow()->SetMultiSamples(0); view->GetInteractor()->Initialize(); view->GetInteractor()->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ScatterPlot) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ScatterPlot MACOSX_BUNDLE ScatterPlot.cxx) target_link_libraries(ScatterPlot ${VTK_LIBRARIES})
Download and Build ScatterPlot¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
Click here to download ScatterPlot and its CMakeLists.txt file. Once the tarball ScatterPlot.tar has been downloaded and extracted,
cd ScatterPlot/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:
./ScatterPlot
WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.