void
vtkHighlightActor2D::RegenerateHighlight()
{
// Count the number of hot points that we need to display.
int i, numHotPoints = 0;
for(i = 0; i < numTools; ++i)
{
if(tools[i]->IsEnabled())
numHotPoints += (int)tools[i]->HotPoints().size();
}
// Allocate some temporary arrays that we'll use to construct the
// highlightData object.
int numPts = 4 * numHotPoints;
vtkPoints *pts = vtkPoints::New();
pts->SetNumberOfPoints(numPts);
vtkCellArray *lines = vtkCellArray::New();
lines->Allocate(lines->EstimateSize(numPts, 2));
vtkUnsignedCharArray *colors = vtkUnsignedCharArray::New();
colors->SetNumberOfComponents(3);
colors->SetNumberOfTuples(numPts);
// Store the colors and points in the polydata.
if(highlightData != NULL)
highlightData->Delete();
highlightData = vtkPolyData::New();
highlightData->Initialize();
highlightData->SetPoints(pts);
highlightData->SetLines(lines);
highlightData->GetCellData()->SetScalars(colors);
pts->Delete(); lines->Delete(); colors->Delete();
// Add a cell to the polyData for each active hotpoint.
int ptIndex = 0;
int cellIndex = 0;
int winWidth = helperRenderer->GetSize()[0];
int winHeight = helperRenderer->GetSize()[1];
double v[4];
double coord[3];
vtkIdType ptIds[4];
coord[2] = 0.;
#define SQRT_OF_2 1.4142136
for(i = 0; i < numTools; ++i)
{
if(tools[i]->IsEnabled() && tools[i]->ShowsHotPointHighlights())
{
const HotPointVector &hpts = tools[i]->HotPoints();
for(size_t j = 0; j < hpts.size(); ++j)
{
// Use the background renderer to compute the normalized
// device coordinate of the hotpoint from the world space
// coordinate.
helperRenderer->SetWorldPoint(hpts[j].pt.x, hpts[j].pt.y, hpts[j].pt.z, 1.0);
helperRenderer->WorldToDisplay();
helperRenderer->GetDisplayPoint(v);
double dX = double((hpts[j].radius * winWidth) / SQRT_OF_2);
double dY = double((hpts[j].radius * winHeight) / SQRT_OF_2);
if (hpts[j].shape == 0) // square
{
coord[0] = v[0] + dX;
coord[1] = v[1] + dY;
pts->SetPoint(ptIndex, coord);
coord[0] = v[0] + dX;
coord[1] = v[1] - dY;
pts->SetPoint(ptIndex + 1, coord);
coord[0] = v[0] - dX;
coord[1] = v[1] - dY;
pts->SetPoint(ptIndex + 2, coord);
coord[0] = v[0] - dX;
coord[1] = v[1] + dY;
pts->SetPoint(ptIndex + 3, coord);
}
else if (hpts[j].shape == 1) // tri up
{
// Yeah, we're making it have four points. It's easier.
coord[0] = v[0] + dX;
coord[1] = v[1] + dY;
pts->SetPoint(ptIndex, coord);
coord[0] = v[0];
coord[1] = v[1];
pts->SetPoint(ptIndex + 1, coord);
coord[0] = v[0] - dX;
coord[1] = v[1] + dY;
pts->SetPoint(ptIndex + 2, coord);
coord[0] = v[0];
coord[1] = v[1] + dY;
pts->SetPoint(ptIndex + 3, coord);
}
else if (hpts[j].shape == 2) // tri down
{
// Yeah, we're making it have four points. It's easier.
coord[0] = v[0] - dX;
coord[1] = v[1] - dY;
pts->SetPoint(ptIndex, coord);
coord[0] = v[0];
coord[1] = v[1];
pts->SetPoint(ptIndex + 1, coord);
coord[0] = v[0] + dX;
coord[1] = v[1] - dY;
pts->SetPoint(ptIndex + 2, coord);
coord[0] = v[0];
coord[1] = v[1] - dY;
pts->SetPoint(ptIndex + 3, coord);
}
for(int k = 0; k < 4; ++k)
{
ptIds[0] = ptIndex + k;
ptIds[1] = (k < 3) ? (ptIndex + k + 1) : ptIndex;
lines->InsertNextCell(2, ptIds);
// Add the color.
unsigned char *rgb = colors->GetPointer(cellIndex * 3);
rgb[0] = 255;
rgb[1] = 0;
rgb[2] = 0;
++cellIndex;
}
ptIndex += 4;
}
}
}
if(highlightMapper != NULL)
highlightMapper->Delete();
highlightMapper = vtkPolyDataMapper2D::New();
highlightMapper->SetInputData(highlightData);
if(highlightActor != NULL)
highlightActor->Delete();
highlightActor = vtkActor2D::New();
highlightActor->GetProperty()->SetLineWidth(2.);
highlightActor->SetMapper(highlightMapper);
highlightActor->PickableOff();
}
