Merge pull request #481 from chakravarthi589/Add_AddCell

Add add cell

src/Java.md

@@ -158,6 +158,7 @@ It would be appreciated if there are any Java VTK experts who could convert any
 | Example Name | Classes Demonstrated | Description | Image |
 | -------------- | ---------------------- | ------------- | ------- |
 [BoundaryEdges](/Java/Meshes/BoundaryEdges) | vtkFeatureEdges | Find the edges that are used by only one face.
+[AddCell](/Java/Meshes/AddCell) | vtkPolyData | Add a cell to an existing mesh.
 
 
 ## Working with 3D Data

src/Java/Meshes/AddCell.java

+import vtk.vtkNativeLibrary;
+import vtk.vtkPoints;
+import vtk.vtkTriangle;
+import vtk.vtkCellArray;
+import vtk.vtkPolyData;
+
+public class AddCell
+{
+  // -----------------------------------------------------------------
+  // Load VTK library and print which library was not properly loaded
+  static 
+  {
+    if (!vtkNativeLibrary.LoadAllNativeLibraries()) 
+    {
+      for (vtkNativeLibrary lib : vtkNativeLibrary.values()) 
+      {
+        if (!lib.IsLoaded()) 
+        {
+          System.out.println(lib.GetLibraryName() + " not loaded");
+        }
+      }
+    }
+    vtkNativeLibrary.DisableOutputWindow(null);
+  }
+  // -----------------------------------------------------------------
+
+  public static void main(String args[]) 
+  {
+    //  Create a triangle
+    vtkPoints points = new vtkPoints();
+    points.InsertNextPoint ( 1.0, 0.0, 0.0 );
+    points.InsertNextPoint ( 0.0, 0.0, 0.0 );
+    points.InsertNextPoint ( 0.0, 1.0, 0.0 );
+
+    vtkTriangle triangle = new vtkTriangle();
+    triangle.GetPointIds().SetId ( 0, 0 );
+    triangle.GetPointIds().SetId ( 1, 1 );
+    triangle.GetPointIds().SetId ( 2, 2 );
+    
+    vtkCellArray triangles = new vtkCellArray();
+    triangles.InsertNextCell ( triangle );
+
+    // Create a polydata object
+    vtkPolyData polyData = new vtkPolyData();
+
+    // Add the geometry and topology to the polydata
+    polyData.SetPoints ( points );
+    polyData.SetPolys ( triangles );
+        
+    System.out.println("There are " + " " + polyData.GetNumberOfCells() + " " + "cells.");
+    polyData.GetPolys().InsertNextCell(triangle);
+    System.out.println("There are " + " " + polyData.GetNumberOfCells() + " " + "cells.");
+
+  }
+}