LinePlot
VTKExamples/Cxx/Plotting/LinePlot
Description¶
This example demonstrates how to plot XY data.
Code¶
LinePlot.cxx
#include <vtkVersion.h> #include <vtkRenderer.h> #include <vtkRenderWindowInteractor.h> #include <vtkRenderWindow.h> #include <vtkSmartPointer.h> #include <vtkChartXY.h> #include <vtkTable.h> #include <vtkPlot.h> #include <vtkFloatArray.h> #include <vtkContextView.h> #include <vtkContextScene.h> #include <vtkPen.h> int main(int, char *[]) { // 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); // Fill in the table with some example values int numPoints = 69; 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)); table->SetValue(i, 2, sin(i * inc)); } // Set up the view vtkSmartPointer<vtkContextView> view = vtkSmartPointer<vtkContextView>::New(); view->GetRenderer()->SetBackground(1.0, 1.0, 1.0); // Add multiple line plots, setting the colors etc vtkSmartPointer<vtkChartXY> chart = vtkSmartPointer<vtkChartXY>::New(); view->GetScene()->AddItem(chart); vtkPlot *line = chart->AddPlot(vtkChart::LINE); #if VTK_MAJOR_VERSION <= 5 line->SetInput(table, 0, 1); #else line->SetInputData(table, 0, 1); #endif line->SetColor(0, 255, 0, 255); line->SetWidth(1.0); line = chart->AddPlot(vtkChart::LINE); #if VTK_MAJOR_VERSION <= 5 line->SetInput(table, 0, 2); #else line->SetInputData(table, 0, 2); #endif line->SetColor(255, 0, 0, 255); line->SetWidth(5.0); // For dotted line, the line type can be from 2 to 5 for different dash/dot // patterns (see enum in vtkPen containing DASH_LINE, value 2): #ifndef WIN32 line->GetPen()->SetLineType(vtkPen::DASH_LINE); #endif // (ifdef-ed out on Windows because DASH_LINE does not work on Windows // machines with built-in Intel HD graphics card...) //view->GetRenderWindow()->SetMultiSamples(0); // Start interactor view->GetInteractor()->Initialize(); view->GetInteractor()->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(LinePlot) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(LinePlot MACOSX_BUNDLE LinePlot.cxx) target_link_libraries(LinePlot ${VTK_LIBRARIES})
Download and Build LinePlot¶
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 LinePlot and its CMakeLists.txt file. Once the tarball LinePlot.tar has been downloaded and extracted,
cd LinePlot/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:
./LinePlot
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.