[vtk-developers] paint on plane, triggered by mouse event
Martin Waitzbauer
mazzok at gmx.at
Sun Sep 18 06:39:43 EDT 2011
Hello, i want to write a small program, that is painting the tiles o a plane, if the user clicks the left mouse button
i tried it like this (most parts taken from http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/ColorCells)
KeyPressInteractorStyle is a self written class, doesnt do anything special than logging left mouse buttons, if the user clicks the left button than arraydata is being filled with a new value,and the window is rendered
the method is like this
virtual void OnLeftButtonDown(){
std::cout << "The left mouse key was pressed." << std::endl;
int r = rand() %2;
arraydata->SetValue(1,r);
this->GetInteractor()->GetRenderWindow()->Render();
}
Unforrtuantly i wasnt able to make it do so!
changes in the array arent displayed on the screen
so my quetion is, how can i access the plane grid data
(set by aPlane->GetOutput()->GetCellData()->SetScalars(cellData);) in a way, that changes , triggered by mouse events get displayed?
Tahsnk alot!
cheers,M
int main...{
int resolution = 3;
vtkSmartPointer<vtkPlaneSource> aPlane =
vtkSmartPointer<vtkPlaneSource>::New();
aPlane->SetXResolution(resolution);
aPlane->SetYResolution(resolution);
// Create cell data
vtkSmartPointer<vtkFloatArray> cellData =
vtkSmartPointer<vtkFloatArray>::New();
for (int i = 0; i < resolution * resolution; i++)
{
cellData->InsertNextValue(0);
}
cellData->SetValue(5,2);
// Create a lookup table to map cell data to colors
vtkSmartPointer<vtkLookupTable> lut =
vtkSmartPointer<vtkLookupTable>::New();
int tableSize = std::max(resolution*resolution + 1, 10);
lut->SetNumberOfTableValues(tableSize);
lut->Build();
// Fill in a few known colors, the rest will be generated if needed
lut->SetTableValue(0 , 0 , 0 , 0, 1); //Black
lut->SetTableValue(1, 0.8900, 0.8100, 0.3400, 1); // Banana
lut->SetTableValue(2, 1.0000, 0.3882, 0.2784, 1); // Tomato
lut->SetTableValue(3, 0.9608, 0.8706, 0.7020, 1); // Wheat
lut->SetTableValue(4, 0.9020, 0.9020, 0.9804, 1); // Lavender
lut->SetTableValue(5, 1.0000, 0.4900, 0.2500, 1); // Flesh
lut->SetTableValue(6, 0.5300, 0.1500, 0.3400, 1); // Raspberry
lut->SetTableValue(7, 0.9804, 0.5020, 0.4471, 1); // Salmon
lut->SetTableValue(8, 0.7400, 0.9900, 0.7900, 1); // Mint
lut->SetTableValue(9, 0.2000, 0.6300, 0.7900, 1); // Peacock
aPlane->Update(); // Force an update so we can set cell data
aPlane->GetOutput()->GetCellData()->SetScalars(cellData);
// Setup actor and mapper
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(aPlane->GetOutputPort());
mapper->SetScalarRange(0, tableSize - 1);
mapper->SetLookupTable(lut);
vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
// Setup render window, renderer, and interactor
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);
renderer->AddActor(actor);
renderer->SetBackground(.1,.2,.3);
renderWindowInteractor->Initialize();
//set up interactor
KeyPressInteractorStyle * ss = KeyPressInteractorStyle::New();
renderWindowInteractor->SetInteractorStyle(ss);
ss->Setarraydata(cellData);
renderWindowInteractor->Start();
}
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