ENH: vtkSurfaceWriter: user-specifiable precision.

Partly solves #65. Ensight writer is fixed but all the other ones probably
need doing as well.

applications/utilities/postProcessing/sampling/sample/sampleDict

@@ -74,6 +74,11 @@ formatOptions
         //collateTimes true;  // write single file containing multiple timesteps
                               // (only for static surfaces)
     }
+    vtk
+    {
+        // Non-default write precision for floating point numbers
+        writePrecision 10;
+    }
     nastran
     {
         // From OpenFOAM field name to Nastran field name

src/OpenFOAM/db/functionObjects/functionObjectFile/functionObjectFile.C

@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2012-2015 OpenFOAM Foundation
-     \\/     M anipulation  | Copyright (C) 2015 OpenCFD Ltd.
+     \\/     M anipulation  | Copyright (C) 2015-2016 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -122,7 +122,7 @@ void Foam::functionObjectFile::resetFile(const word& fileName)
 
 Foam::Omanip<int> Foam::functionObjectFile::valueWidth(const label offset) const
 {
-    return setw(IOstream::defaultPrecision() + addChars + offset);
+    return setw(writePrecision_ + addChars + offset);
 }
 
 
@@ -211,7 +211,7 @@ bool Foam::functionObjectFile::writeToFile() const
 
 Foam::label Foam::functionObjectFile::charWidth() const
 {
-    return IOstream::defaultPrecision() + addChars;
+    return writePrecision_ + addChars;
 }
 
 

src/sampling/sampledSurface/writers/vtk/vtkSurfaceWriter.C

@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
-     \\/     M anipulation  | Copyright (C) 2015 OpenCFD Ltd.
+     \\/     M anipulation  | Copyright (C) 2015-2016 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -31,6 +31,7 @@ License
 namespace Foam
 {
     makeSurfaceWriterType(vtkSurfaceWriter);
+    addToRunTimeSelectionTable(surfaceWriter, vtkSurfaceWriter, wordDict);
 }
 
 
@@ -202,7 +203,22 @@ namespace Foam
 
 Foam::vtkSurfaceWriter::vtkSurfaceWriter()
 :
-    surfaceWriter()
+    surfaceWriter(),
+    writePrecision_(IOstream::defaultPrecision())
+{}
+
+
+Foam::vtkSurfaceWriter::vtkSurfaceWriter(const dictionary& dict)
+:
+    surfaceWriter(),
+    writePrecision_
+    (
+        dict.lookupOrDefault
+        (
+            "writePrecision",
+            IOstream::defaultPrecision()
+        )
+    )
 {}
 
 
@@ -229,6 +245,7 @@ Foam::fileName Foam::vtkSurfaceWriter::write
     }
 
     OFstream os(outputDir/surfaceName + ".vtk");
+    os.precision(writePrecision_);
 
     if (verbose)
     {

src/sampling/sampledSurface/writers/vtk/vtkSurfaceWriter.H

@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2011 OpenFOAM Foundation
-     \\/     M anipulation  | Copyright (C) 2015 OpenCFD Ltd.
+     \\/     M anipulation  | Copyright (C) 2015-2016 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -50,6 +50,11 @@ class vtkSurfaceWriter
 :
     public surfaceWriter
 {
+    // Private data
+
+        const unsigned int writePrecision_;
+
+
     // Private Member Functions
 
         static void writeGeometry(Ostream&, const pointField&, const faceList&);
@@ -84,6 +89,9 @@ public:
         //- Construct null
         vtkSurfaceWriter();
 
+        //- Construct with some output options
+        vtkSurfaceWriter(const dictionary& options);
+
 
     //- Destructor
     virtual ~vtkSurfaceWriter();

src/sampling/sampledSurface/writers/vtk/vtkSurfaceWriterTemplates.C

@@ -63,6 +63,7 @@ Foam::fileName Foam::vtkSurfaceWriter::writeTemplate
     }
 
     OFstream os(outputDir/fieldName + '_' + surfaceName + ".vtk");
+    os.precision(writePrecision_);
 
     if (verbose)
     {