[chronojump] Encoder image save: ensure end on .png

[Xavier de Blas <xaviblas src gnome org>]

commit 1aee77dc4bcd28376d860b3ffc241f34564b8812
Author: Xavier de Blas <xaviblas gmail com>
Date:   Mon Apr 15 13:50:30 2013 +0200

    Encoder image save: ensure end on .png

 src/gui/encoder.cs |  2 ++
 src/util.cs        | 10 ++++++++--
 2 files changed, 10 insertions(+), 2 deletions(-)
---
diff --git a/src/gui/encoder.cs b/src/gui/encoder.cs
index 70d9200..0a150d2 100644
--- a/src/gui/encoder.cs
+++ b/src/gui/encoder.cs
@@ -1000,6 +1000,8 @@ public partial class ChronoJumpWindow
                        if(checkFileOp == Constants.EncoderCheckFileOp.ANALYZE_EXPORT_ALL_CURVES ||
                                        checkFileOp == Constants.EncoderCheckFileOp.ANALYZE_SAVE_TABLE)
                                exportFileName = Util.AddCsvIfNeeded(exportFileName);
+                       else
+                               exportFileName = Util.AddPngIfNeeded(exportFileName);
                        try {
                                if (File.Exists(exportFileName)) {
                                        Log.WriteLine(string.Format(
diff --git a/src/util.cs b/src/util.cs
index 916ff92..c60ddeb 100644
--- a/src/util.cs
+++ b/src/util.cs
@@ -1564,11 +1564,17 @@ public class Util
                return array;
        }
 
-       public static string AddCsvIfNeeded(string myFile)
+       public static string AddCsvIfNeeded(string myFile) {
+               return addExtensionIfNeeded(myFile, ".csv");
+       }
+       public static string AddPngIfNeeded(string myFile) {
+               return addExtensionIfNeeded(myFile, ".png");
+       }
+       private static string addExtensionIfNeeded(string myFile, string extension)
        {
                int posOfDot = myFile.LastIndexOf('.');
                if (posOfDot == -1) 
-                       myFile += ".csv";
+                       myFile += extension;
                
                return myFile;
        }