Hello everyone!
I am working on a project where I use VTK alongside Qt. I am trying to render a chart inside of QDockWidget. I have a class that extends QVTKOpenGLNativeWidget and stores a renderer (vtkRenderer) and a render window (vtkGenericOpenGLRenderWindow). For starters I tried to render the ScatterPlot example. Here is my code:
SceneWidget2D::SceneWidget2D()
: mRenderWindow(vtkSmartPointer<vtkGenericOpenGLRenderWindow>::New())
, mRenderer(vtkSmartPointer<vtkRenderer>::New())
{
setRenderWindow(mRenderWindow);
vtkNew<vtkContextActor> cActor;
vtkNew<vtkNamedColors> colors;
mRenderer->SetBackground(colors->GetColor3d("SlateGray").GetData());
vtkNew<vtkChartXY> chart;
cActor->GetScene()->AddItem(chart);
chart->SetShowLegend(true);
// Create a table with some points in it...
vtkNew<vtkTable> table;
vtkNew<vtkFloatArray> arrX;
arrX->SetName("X Axis");
table->AddColumn(arrX);
vtkNew<vtkFloatArray> arrC;
arrC->SetName("Cosine");
table->AddColumn(arrC);
vtkNew<vtkFloatArray> arrS;
arrS->SetName("Sine");
table->AddColumn(arrS);
vtkNew<vtkFloatArray> arrT;
arrT->SetName("Sine - Cosine");
table->AddColumn(arrT);
// Test charting with a few more points...
int numPoints = 40;
float inc = 7.5f / (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);
points->SetInputData(table, 0, 1);
points->SetColor(0, 0, 0, 255);
points->SetWidth(1.0);
dynamic_cast<vtkPlotPoints*>(points)->SetMarkerStyle(vtkPlotPoints::CROSS);
points = chart->AddPlot(vtkChart::POINTS);
points->SetInputData(table, 0, 2);
points->SetColor(0, 0, 0, 255);
points->SetWidth(1.0);
dynamic_cast<vtkPlotPoints*>(points)->SetMarkerStyle(vtkPlotPoints::PLUS);
points = chart->AddPlot(vtkChart::POINTS);
points->SetInputData(table, 0, 3);
points->SetColor(0, 0, 255, 255);
points->SetWidth(1.0);
dynamic_cast<vtkPlotPoints*>(points)->SetMarkerStyle(vtkPlotPoints::CIRCLE);
mRenderer->AddActor(cActor);
// add renderer to the window
mRenderWindow->AddRenderer(mRenderer);
mRenderWindow->SetMultiSamples(0);
I had to do some adaptations because I didnt need vtkContextView since I already have my renderer and render window. I instead use the vtkContextActor. Here is what the result looks like:
As you can see the 2nd and 3rd plot are not shown. Additionally when I change the marker style of the first plot to vtkPlotPoints::CIRCLE no plots are shown anymore. When I change them all to squares it works for all 3 plots:
I would really like to use a different marker style here. Any suggestions?
