private void CreateViewportBorder(vtkRenderer renderer, double[] color)
{
ModelLoaded = false;
// points start at upper right and proceed anti-clockwise
vtkPoints points = vtkPoints.New();
points.SetNumberOfPoints(4);
points.InsertPoint(0, 1, 1, 0);
points.InsertPoint(1, 1e-3, 1, 0);
points.InsertPoint(2, 1e-3, 1e-3, 0);
points.InsertPoint(3, 1, 1e-3, 0);
// create cells, and lines
vtkCellArray cells = vtkCellArray.New();
cells.Initialize();
vtkPolyLine lines = vtkPolyLine.New();
lines.GetPointIds().SetNumberOfIds(5);
for (int i = 0; i < 4; ++i)
{
lines.GetPointIds().SetId(i, i);
}
lines.GetPointIds().SetId(4, 0);
cells.InsertNextCell(lines);
// now make tge polydata and display it
vtkPolyData poly = vtkPolyData.New();
poly.Initialize();
poly.SetPoints(points);
poly.SetLines(cells);
// use normalized viewport coordinates since
// they are independent of window size
vtkCoordinate coordinate = vtkCoordinate.New();
coordinate.SetCoordinateSystemToNormalizedViewport();
vtkPolyDataMapper2D mapper = vtkPolyDataMapper2D.New();
mapper.SetInput(poly);
mapper.SetTransformCoordinate(coordinate);
vtkActor2D actor = vtkActor2D.New();
actor.SetMapper(mapper);
actor.GetProperty().SetColor(color[0], color[1], color[2]);
// line width should be at least 2 to be visible at extremes
actor.GetProperty().SetLineWidth((float)2.0); // Line Width
renderer.AddViewProp(actor);
}