# Quad

VTKExamples/Python/GeometricObjects/Quad

### Code

Quad.py

    #!/usr/bin/env python

    import vtk

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

        # Create four points (must be in counter clockwise order)
        p0 = [0.0, 0.0, 0.0]
        p1 = [1.0, 0.0, 0.0]
        p2 = [1.0, 1.0, 0.0]
        p3 = [0.0, 1.0, 0.0]

        # Add the points to a vtkPoints object
        points = vtk.vtkPoints()
        points.InsertNextPoint(p0)
        points.InsertNextPoint(p1)
        points.InsertNextPoint(p2)
        points.InsertNextPoint(p3)

        # Create a quad on the four points
        quad = vtk.vtkQuad()
        quad.GetPointIds().SetId(0, 0)
        quad.GetPointIds().SetId(1, 1)
        quad.GetPointIds().SetId(2, 2)
        quad.GetPointIds().SetId(3, 3)

        # Create a cell array to store the quad in
        quads = vtk.vtkCellArray()
        quads.InsertNextCell(quad)

        # Create a polydata to store everything in
        polydata = vtk.vtkPolyData()

        # Add the points and quads to the dataset
        polydata.SetPoints(points)
        polydata.SetPolys(quads)

        # Setup actor and mapper
        mapper = vtk.vtkPolyDataMapper()
        if vtk.VTK_MAJOR_VERSION <= 5:
            mapper.SetInput(polydata)
        else:
            mapper.SetInputData(polydata)

        actor = vtk.vtkActor()
        actor.SetMapper(mapper)
        actor.GetProperty().SetColor(colors.GetColor3d("Silver"))

        # Setup render window, renderer, and interactor
        renderer = vtk.vtkRenderer()
        renderWindow = vtk.vtkRenderWindow()
        renderWindow.SetWindowName("Quad")
        renderWindow.AddRenderer(renderer)
        renderWindowInteractor = vtk.vtkRenderWindowInteractor()
        renderWindowInteractor.SetRenderWindow(renderWindow)

        renderer.AddActor(actor)
        renderer.SetBackground(colors.GetColor3d("Salmon"))
        renderWindow.Render()
        renderWindowInteractor.Start()

    if __name__ == '__main__':
        main()