ColoredTriangle

VTKExamples/Python/PolyData/ColoredTriangle

Decription

Creates a file TriangleColored.vtp.

Question

If you have a simple question about this example contact us at VTKExamplesProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

Code

ColoredTriangle.py

import vtk


def get_program_parameters():
    import argparse
    description = 'Generate a colored triangle, then write a .vtp file.'
    epilogue = '''
   '''
    parser = argparse.ArgumentParser(description=description, epilog=epilogue)
    parser.add_argument('filename', help='A required vtp filename.', nargs='?',
                        const='TestColoredTriangle.vtp',
                        type=str, default='TestColoredTriangle.vtp')
    args = parser.parse_args()
    return args.filename


def main():
    colors = vtk.vtkNamedColors()

    filename = get_program_parameters()

    # setup points and vertices
    Points = vtk.vtkPoints()
    Triangles = vtk.vtkCellArray()

    Points.InsertNextPoint(1.0, 0.0, 0.0)
    Points.InsertNextPoint(0.0, 0.0, 0.0)
    Points.InsertNextPoint(0.0, 1.0, 0.0)

    Triangle = vtk.vtkTriangle()
    Triangle.GetPointIds().SetId(0, 0)
    Triangle.GetPointIds().SetId(1, 1)
    Triangle.GetPointIds().SetId(2, 2)
    Triangles.InsertNextCell(Triangle)

    # setup colors
    Colors = vtk.vtkUnsignedCharArray()
    Colors.SetNumberOfComponents(3)
    Colors.SetName("Colors")
    Colors.InsertNextTuple3(*colors.GetColor3ub('Red'))
    Colors.InsertNextTuple3(*colors.GetColor3ub('Lime'))
    Colors.InsertNextTuple3(*colors.GetColor3ub('Blue'))

    polydata = vtk.vtkPolyData()
    polydata.SetPoints(Points)
    polydata.SetPolys(Triangles)

    polydata.GetPointData().SetScalars(Colors)
    polydata.Modified()

    writer = vtk.vtkXMLPolyDataWriter()
    writer.SetFileName(filename)
    writer.SetInputData(polydata)
    writer.Write()


if __name__ == '__main__':
    main()