Added a function to join all segments in the order of the GPX file

This will produce a non-scattered output (only) if the GPX file's
segment order is correct, but the segments don't share points at the
beginning and the end so that the default combining algorithm won't
work.

gpx2svg

@@ -184,6 +184,17 @@ def combineSegments(gpsData):
 
     return circularSegments + remainingSegments
 
+def chronologyJoinSegments(gpsData):
+    """Join all segments to a big one in the order defined by the GPX file."""
+    joinedSegment = []
+
+    # Walk through the GPS data
+    for segment in gpsData:
+        for coord in segment:
+            joinedSegment.append(coord)
+
+    return [joinedSegment]
+
 def scaleCoords(coord, height, scale):
     """Return a scaled pair of coordinates"""
     return coord[0] * scale, (coord[1] * -1 + height) * scale
@@ -305,6 +316,12 @@ def main():
         help = ('"Raw" conversion: Create one SVG path per track segment, don\'t try to combine '
                 'paths that end with the starting point of another path')
     )
+    cmdArgParser.add_argument(
+        '-j', action = 'store_true',
+        help = ('Join all segments to a big one in the order of the GPX file. This can create an '
+                'un-scattered path if the default combining algorithm does not work because there '
+                'are no matching points across segments (implies -r)')
+    )
 
     # Get the given arguments
     cmdArgs = cmdArgParser.parse_args()
@@ -331,8 +348,13 @@ def main():
         print('No data to convert. Terminating.', file = sys.stderr)
         sys.exit(1)
 
+    # Join all segments if requested by "-j"
+    if cmdArgs.j:
+        gpsData = chronologyJoinSegments(gpsData)
+
     # Try to combine all track segments that can be combined if not requested otherwise
-    if not cmdArgs.r:
+    # Don't execute if all segments are already joined with "-j"
+    if not cmdArgs.r and not cmdArgs.j:
         gpsData = combineSegments(gpsData)
 
     # Calculate a plane projection for a GPS dataset