Create CenterOfMass.java

Former-commit-id: da7f1d92

src/Java/PolyData/CenterOfMass.java

+import vtk.vtkNativeLibrary;
+import vtk.vtkCenterOfMass;
+import vtk.vtkPolyData;
+import vtk.vtkPoints;
+
+public class CenterOfMass 
+{
+  // -----------------------------------------------------------------
+  // 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[]) 
+  {  
+    vtkPoints points = new vtkPoints();
+    points.InsertNextPoint(0,0,0);
+    points.InsertNextPoint(1,0,0);
+    points.InsertNextPoint(0,1,0);
+    points.InsertNextPoint(1,1,0);
+    
+    vtkPolyData polydata = new vtkPolyData();
+    polydata.SetPoints(points);
+    
+    // Compute the center of mass
+    vtkCenterOfMass centerOfMassFilter = new vtkCenterOfMass();
+    centerOfMassFilter.SetInputData(polydata);
+    centerOfMassFilter.SetUseScalarsAsWeights(false);
+    centerOfMassFilter.Update();
+    
+    double center[] = new double[3];
+    center = centerOfMassFilter.GetCenter();
+    System.out.print("Center of mass is " + " " + center[0] + " " + center[1] + " " + center[2]);
+  }
+}