Adding Polygon.

Former-commit-id: 13999a60

src/Cxx/GeometricObjects/Polygon.cxx

-#include <vtkVersion.h>
-#include <vtkSmartPointer.h>
-#include <vtkPolygon.h>
+#include <vtkActor.h>
 #include <vtkCellArray.h>
+#include <vtkNamedColors.h>
 #include <vtkPolyData.h>
 #include <vtkPolyDataMapper.h>
-#include <vtkActor.h>
-#include <vtkRenderWindow.h>
+#include <vtkPolygon.h>
+#include <vtkProperty.h>
 #include <vtkRenderer.h>
+#include <vtkRenderWindow.h>
 #include <vtkRenderWindowInteractor.h>
+#include <vtkSmartPointer.h>
+#include <vtkVersion.h>
 
 int main(int, char *[])
 {
+  vtkSmartPointer<vtkNamedColors> colors =
+    vtkSmartPointer<vtkNamedColors>::New();
+
   // Setup four points
   vtkSmartPointer<vtkPoints> points =
     vtkSmartPointer<vtkPoints>::New();
@@ -51,6 +56,8 @@ int main(int, char *[])
   vtkSmartPointer<vtkActor> actor =
     vtkSmartPointer<vtkActor>::New();
   actor->SetMapper(mapper);
+  actor->GetProperty()->SetColor(
+    colors->GetColor3d("Silver").GetData());
 
   // Visualize
   vtkSmartPointer<vtkRenderer> renderer =
@@ -63,8 +70,7 @@ int main(int, char *[])
   renderWindowInteractor->SetRenderWindow(renderWindow);
 
   renderer->AddActor(actor);
-  renderer->SetBackground(.5,.3,.31); // Background color salmon
-
+  renderer->SetBackground(colors->GetColor3d("Salmon").GetData());
   renderWindow->Render();
   renderWindowInteractor->Start();
 

src/Python/GeometricObjects/Polygon.md

+### Description
+The polygon is a primary two-dimensional cell. The polygon is defined by an ordered list of three or more points lying in a plane. The polygon normal is implicitly defined by a counterclockwise ordering of its points using the right-hand rule.
+
+The polygon may be nonconvex, but may not have internal loops, and it cannot self-intersect. The polygon has n edges, where n is the number of points in the polygon.

src/Python/GeometricObjects/Polygon.py

@@ -2,49 +2,56 @@
 
 import vtk
 
-# Setup four points
-points = vtk.vtkPoints()
-points.InsertNextPoint(0.0, 0.0, 0.0)
-points.InsertNextPoint(1.0, 0.0, 0.0)
-points.InsertNextPoint(1.0, 1.0, 0.0)
-points.InsertNextPoint(0.0, 1.0, 0.0)
-
-# Create the polygon
-polygon = vtk.vtkPolygon()
-polygon.GetPointIds().SetNumberOfIds(4)  # make a quad
-polygon.GetPointIds().SetId(0, 0)
-polygon.GetPointIds().SetId(1, 1)
-polygon.GetPointIds().SetId(2, 2)
-polygon.GetPointIds().SetId(3, 3)
-
-# Add the polygon to a list of polygons
-polygons = vtk.vtkCellArray()
-polygons.InsertNextCell(polygon)
-
-# Create a PolyData
-polygonPolyData = vtk.vtkPolyData()
-polygonPolyData.SetPoints(points)
-polygonPolyData.SetPolys(polygons)
-
-# Create a mapper and actor
-mapper = vtk.vtkPolyDataMapper()
-if vtk.VTK_MAJOR_VERSION <= 5:
-    mapper.SetInput(polygonPolyData)
-else:
-    mapper.SetInputData(polygonPolyData)
-
-actor = vtk.vtkActor()
-actor.SetMapper(mapper)
-
-# Visualize
-renderer = vtk.vtkRenderer()
-renderWindow = vtk.vtkRenderWindow()
-renderWindow.AddRenderer(renderer)
-renderWindowInteractor = vtk.vtkRenderWindowInteractor()
-renderWindowInteractor.SetRenderWindow(renderWindow)
-
-renderer.AddActor(actor)
-renderer.SetBackground(.5, .3, .31)  # Background color salmon
-
-renderWindow.Render()
-renderWindowInteractor.Start()
+def main():
+    colors = vtk.vtkNamedColors()
+
+    # Setup four points
+    points = vtk.vtkPoints()
+    points.InsertNextPoint(0.0, 0.0, 0.0)
+    points.InsertNextPoint(1.0, 0.0, 0.0)
+    points.InsertNextPoint(1.0, 1.0, 0.0)
+    points.InsertNextPoint(0.0, 1.0, 0.0)
+
+    # Create the polygon
+    polygon = vtk.vtkPolygon()
+    polygon.GetPointIds().SetNumberOfIds(4)  # make a quad
+    polygon.GetPointIds().SetId(0, 0)
+    polygon.GetPointIds().SetId(1, 1)
+    polygon.GetPointIds().SetId(2, 2)
+    polygon.GetPointIds().SetId(3, 3)
+
+    # Add the polygon to a list of polygons
+    polygons = vtk.vtkCellArray()
+    polygons.InsertNextCell(polygon)
+
+    # Create a PolyData
+    polygonPolyData = vtk.vtkPolyData()
+    polygonPolyData.SetPoints(points)
+    polygonPolyData.SetPolys(polygons)
+
+    # Create a mapper and actor
+    mapper = vtk.vtkPolyDataMapper()
+    if vtk.VTK_MAJOR_VERSION <= 5:
+        mapper.SetInput(polygonPolyData)
+    else:
+        mapper.SetInputData(polygonPolyData)
+
+    actor = vtk.vtkActor()
+    actor.SetMapper(mapper)
+    actor.GetProperty().SetColor(colors.GetColor3d("Silver"))
+
+    # Visualize
+    renderer = vtk.vtkRenderer()
+    renderWindow = vtk.vtkRenderWindow()
+    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()