STYLE: One declaration per line for readability

Multiple declarations in a single statement reduces readability.

Detect local variable declaration statements and update to have only one
statement per declaration.

Initialize values rather than independant assignments of each
element

src/Core/Common/BoundingBoxOfAPointSet/Code.cxx

@@ -36,17 +36,11 @@ main()
   PointsContainerPointer points = pointSet->GetPoints();
 
   // Create points
-  PointType p0, p1, p2;
-
-  p0[0] = 0.0;
-  p0[1] = 0.0;
-  p0[2] = 0.0;
-  p1[0] = 0.1;
-  p1[1] = 0.0;
-  p1[2] = 0.0;
-  p2[0] = 0.0;
-  p2[1] = 0.1;
-  p2[2] = 0.0;
+  // Create points
+  using PointType = PointSetType::PointType;
+  const PointType p0({ 0.0, 0.0, 0.0 });
+  const PointType p1({ 0.1, 0.0, 0.0 });
+  const PointType p2({ 0.0, 0.1, 0.0 });
 
   points->InsertElement(0, p0);
   points->InsertElement(1, p1);

src/Core/Common/CreateAPointSet/Code.cxx

@@ -33,17 +33,9 @@ main()
 
   // Create points
   using PointType = PointSetType::PointType;
-  PointType p0, p1, p2;
-
-  p0[0] = 0.0;
-  p0[1] = 0.0;
-  p0[2] = 0.0;
-  p1[0] = 0.1;
-  p1[1] = 0.0;
-  p1[2] = 0.0;
-  p2[0] = 0.0;
-  p2[1] = 0.1;
-  p2[2] = 0.0;
+  const PointType p0({ 0.0, 0.0, 0.0 });
+  const PointType p1({ 0.1, 0.0, 0.0 });
+  const PointType p2({ 0.0, 0.1, 0.0 });
 
   points->InsertElement(0, p0);
   points->InsertElement(1, p1);

src/Core/Mesh/AddPointsAndEdges/Code.cxx

@@ -42,20 +42,10 @@ CreatePointOnlyMesh()
   auto mesh = MeshType::New();
 
   // Create points
-  MeshType::PointType p0, p1, p2, p3;
-
-  p0[0] = -1.0;
-  p0[1] = -1.0;
-  p0[2] = 0.0; // first  point ( -1, -1, 0 )
-  p1[0] = 1.0;
-  p1[1] = -1.0;
-  p1[2] = 0.0; // second point (  1, -1, 0 )
-  p2[0] = 1.0;
-  p2[1] = 1.0;
-  p2[2] = 0.0; // third  point (  1,  1, 0 )
-  p3[0] = 1.0;
-  p3[1] = 1.0;
-  p3[2] = 1.0; // third  point (  1,  1, 1 )
+  const MeshType::PointType p0({ -1.0, -1.0, 0 });  // first  point ( -1, -1, 0 )
+  const MeshType::PointType p1({ 1.0, -1.0, 0.0 }); // second point (  1, -1, 0 )
+  const MeshType::PointType p2({ 1.0, 1.0, 0.0 });  // third  point (  1,  1, 0 )
+  const MeshType::PointType p3({ 1.0, 1.0, 1.0 });  // forth  point (  1,  1, 1 )
 
   mesh->SetPoint(0, p0);
   mesh->SetPoint(1, p1);
@@ -68,7 +58,6 @@ CreatePointOnlyMesh()
   using PointsIterator = MeshType::PointsContainer::Iterator;
 
   PointsIterator pointIterator = mesh->GetPoints()->Begin();
-
   PointsIterator end = mesh->GetPoints()->End();
   while (pointIterator != end)
   {

src/Core/Mesh/WriteMeshToVTP/Code.cxx

@@ -48,20 +48,10 @@ CreateMeshWithEdges()
   auto mesh = MeshType::New();
 
   // Create points
-  MeshType::PointType p0, p1, p2, p3;
-
-  p0[0] = -1.0;
-  p0[1] = -1.0;
-  p0[2] = 0.0; // first  point ( -1, -1, 0 )
-  p1[0] = 1.0;
-  p1[1] = -1.0;
-  p1[2] = 0.0; // second point (  1, -1, 0 )
-  p2[0] = 1.0;
-  p2[1] = 1.0;
-  p2[2] = 0.0; // third  point (  1,  1, 0 )
-  p3[0] = 1.0;
-  p3[1] = 1.0;
-  p3[2] = 1.0; // third  point (  1,  1, 1 )
+  const MeshType::PointType p0({ -1.0, -1.0, 0 });  // first  point ( -1, -1, 0 )
+  const MeshType::PointType p1({ 1.0, -1.0, 0.0 }); // second point (  1, -1, 0 )
+  const MeshType::PointType p2({ 1.0, 1.0, 0.0 });  // third  point (  1,  1, 0 )
+  const MeshType::PointType p3({ 1.0, 1.0, 1.0 });  // forth  point (  1,  1, 1 )
 
   mesh->SetPoint(0, p0);
   mesh->SetPoint(1, p1);
@@ -74,7 +64,6 @@ CreateMeshWithEdges()
   using PointsIterator = MeshType::PointsContainer::Iterator;
 
   PointsIterator pointIterator = mesh->GetPoints()->Begin();
-
   PointsIterator end = mesh->GetPoints()->End();
   while (pointIterator != end)
   {
@@ -86,7 +75,6 @@ CreateMeshWithEdges()
   using CellAutoPointer = MeshType::CellType::CellAutoPointer;
   using LineType = itk::LineCell<MeshType::CellType>;
 
-
   CellAutoPointer line0;
   line0.TakeOwnership(new LineType);
   line0->SetPointId(0, 0); // line between points 0 and 1

src/Filtering/ImageGrid/FitSplineIntoPointSet/Code.cxx

@@ -28,32 +28,26 @@ main()
   constexpr unsigned int DataDimension = 2;
 
   using DataType = itk::Vector<float, DataDimension>;
-
   using PointSetType = itk::PointSet<DataType, ParametricDimension>;
 
   auto pointSet = PointSetType::New();
 
-  PointSetType::PointType param0, param1, param2;
+  const PointSetType::PointType param0{ 0.0 };
 
-  param0[0] = 0.0;
-  DataType p0;
-  p0[0] = 10.0;
-  p0[1] = 10.0;
+  const DataType p0({ 10.0, 10.0 });
 
   pointSet->SetPoint(0, param0);
   pointSet->SetPointData(0, p0);
 
-  param1[0] = 1.0;
-  DataType p1;
-  p1[0] = 80.0;
-  p1[1] = 50.0;
+  const PointSetType::PointType param1{ 1.0 };
+  const DataType                p1({ 80.0, 50.0 });
   pointSet->SetPoint(1, param1);
   pointSet->SetPointData(1, p1);
 
-  param2[0] = 2.0;
-  DataType p2;
-  p2[0] = 180.0;
-  p2[1] = 180.0;
+
+  PointSetType::PointType param2{ 2.0 };
+  DataType                p2({ 100.0, 100.0 });
+
   pointSet->SetPoint(2, param2);
   pointSet->SetPointData(2, p2);
 
@@ -68,11 +62,10 @@ main()
   SplineFilterType::ArrayType closedim;
   closedim[0] = 0;
 
-  ImageType::PointType parametricDomainOrigin;
-  parametricDomainOrigin[0] = 0.0;
+  const ImageType::PointType parametricDomainOrigin{ 0.0 };
 
-  ImageType::SpacingType parametricDomainSpacing;
-  parametricDomainSpacing[0] = 0.0001; // this determines the sampling of the continuous B-spline object.
+  // this determines the sampling of the continuous B-spline object.
+  const ImageType::SpacingType parametricDomainSpacing{ 0.0001 };
 
   ImageType::SizeType parametricDomainSize;
   parametricDomainSize[0] = 2.0 / parametricDomainSpacing[0] + 1;