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
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.