Diagram

VTKExamples/Cxx/Plotting/Diagram


Code

Diagram.cxx

#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkSmartPointer.h>
#include <vtkObjectFactory.h>
#include <vtkContext2D.h>
#include <vtkContextItem.h>
#include <vtkContextActor.h>
#include <vtkContextScene.h>
#include <vtkPen.h>
#include <vtkBrush.h>
#include <vtkTextProperty.h>
#include <vtkOpenGLContextDevice2D.h>
#include <vtkStdString.h>

#define VTK_CREATE(type, name) \
  vtkSmartPointer<type> name = vtkSmartPointer<type>::New()

//----------------------------------------------------------------------------
class APIDiagram : public vtkContextItem
{
public:
  static APIDiagram *New();
  vtkTypeMacro(APIDiagram, vtkContextItem);
  // Paint event for the chart, called whenever the chart needs to be drawn
  virtual bool Paint(vtkContext2D *painter);
};

//----------------------------------------------------------------------------
int main( int, char *[] )
{
  // Set up a 2D chart actor, APIDiagram object andn add them to the renderer
  VTK_CREATE(vtkContextActor, actor);
  VTK_CREATE(APIDiagram, diagram);
  actor->GetScene()->AddItem(diagram);
  VTK_CREATE(vtkRenderer, renderer);
  renderer->SetBackground(.2, .3, .4);
  VTK_CREATE(vtkRenderWindow, renderWindow);
  renderWindow->SetSize(800, 600);
  renderWindow->AddRenderer(renderer);
  renderer->AddActor(actor);

  VTK_CREATE(vtkRenderWindowInteractor, interactor);
  interactor->SetRenderWindow(renderWindow);
  renderWindow->SetMultiSamples(0);
  renderWindow->Render();

  interactor->Start();

  return true;
}

// Make our new derived class to draw a diagram
vtkStandardNewMacro(APIDiagram);
// This function draws our API diagram
bool APIDiagram::Paint(vtkContext2D *painter)
{
  // Drawing a hard wired diagram 800x600 as a demonstration of the 2D API
  painter->GetTextProp()->SetVerticalJustificationToCentered();
  painter->GetTextProp()->SetJustificationToCentered();
  painter->GetTextProp()->SetColor(0.0, 0.0, 0.0);
  painter->GetTextProp()->SetFontSize(24);
  painter->GetPen()->SetColor(0, 0, 0);

  painter->GetBrush()->SetColor(100, 255, 100);
  painter->DrawRect(100, 50, 200, 100);
  painter->DrawString(200, 100, "OpenGL");

  painter->GetBrush()->SetColor(255, 100, 0);
  painter->DrawRect(300, 50, 200, 100);
  painter->DrawString(400, 100, "Others?");

  painter->GetBrush()->SetColor(100, 0, 255);
  painter->DrawRect(500, 50, 200, 100);
  painter->DrawString(600, 100, "Others?");

  painter->GetBrush()->SetColor(180, 180, 255);
  painter->DrawRect(100, 150, 600, 100);
  painter->DrawString(400, 200, "2D API");

  painter->GetBrush()->SetColor(255, 255, 180);
  painter->DrawRect(100, 250, 600, 200);
  painter->DrawString(400, 400, "Canvas API");

  painter->GetBrush()->SetColor(180, 255, 180);
  painter->DrawRect(100, 250, 300, 100);
  painter->DrawString(250, 300, "Point Mark");

  painter->GetBrush()->SetColor(255, 255, 255);
  painter->DrawRect(100, 450, 600, 100);
  painter->DrawString(400, 500, "Canvas View");

  return true;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(Diagram)

find_package(VTK REQUIRED)
include(${VTK_USE_FILE})

add_executable(Diagram MACOSX_BUNDLE Diagram.cxx )

target_link_libraries(Diagram ${VTK_LIBRARIES})

Download and Build Diagram

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

cd Diagram/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:

./Diagram

WINDOWS USERS

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