diff --git a/src/GUIFrame.cc b/src/GUIFrame.cc
index 351562e..c283449 100644
--- a/src/GUIFrame.cc
+++ b/src/GUIFrame.cc
@@ -706,10 +706,16 @@ void GUIFrame::RenameSmartpen(wxCommandEvent& event) {
         if (confirmationDialog.ShowModal() == wxID_YES) {
             printf("Request confirmed. Attempting to rename device...\n");
             smartpen->setName((char*)desiredName.c_str());
-            printf("returned from setting pen name. resetting device.\n");
+            printf("returned from setting pen name. Disconnecting old smartpen instance.\n");
+            smartpen->disconnect();
+            printf("Destory old smartpen object.");
+            delete smartpen;
+            smartpen = NULL;
+            printf("Close usb decice connection");
             libusb_close(dev);
-            dev = findSmartpen();
-            printf("Retrieving smartpen name: %s\n", smartpen->getName());
+            dev = NULL;
+            printf("Refresh decice. Device should be detected under new name.\n");
+            doRefreshDeviceState();
         } else printf("Rename operation cancelled.\n");
     }
 }
diff --git a/stf.py b/stf.py
index 9d257a6..5c65bb8 100644
--- a/stf.py
+++ b/stf.py
@@ -292,7 +292,40 @@ def handle_point(self, x, y, force, time):
         assert False
 
 
-surface = cairo.ImageSurface(cairo.FORMAT_RGB24, 8000, 8000)
+class PreParser(STFParser):
+    def __init__(self, *args):
+        super(PreParser, self).__init__(*args)
+        self.minx=8000
+        self.miny=8000
+        self.maxx=0
+        self.maxy=0
+
+    def handle_point(self, x, y, f, time):
+        if f:
+            if x > self.maxx:
+                self.maxx=x
+            if x < self.minx:
+                self.minx=x
+            if y > self.maxy:
+                self.maxy=y
+            if y < self.miny:
+                self.miny=y
+
+try:
+    stf_file
+except NameError:
+    stf_file = sys.argv[1]
+
+pref = file(stf_file)
+prep = PreParser(pref)
+prep.parse()
+
+if prep.maxx > 8000:
+    prep.maxx = 8000
+if prep.maxy > 8000:
+    prep.maxy = 8000
+
+surface = cairo.ImageSurface(cairo.FORMAT_RGB24, prep.maxx-prep.minx, prep.maxy-prep.miny)
 ctx = cairo.Context(surface)
 
 print float(fgRed)
@@ -303,6 +336,7 @@ def handle_point(self, x, y, force, time):
 print float(bgGreen)
 print float(bgBlue)
 
+ctx.set_line_width(10)
 ctx.set_source_rgb(float(bgRed), float(bgGreen), float(bgBlue))
 ctx.paint()
 ctx.set_source_rgb(float(fgRed), float(fgGreen), float(fgBlue))
@@ -319,9 +353,9 @@ def handle_stroke_end(self, time):
     def handle_point(self, x, y, f, time):
         if f:
             if self.last_force:
-                ctx.line_to(x, y)
+                ctx.line_to(x-prep.minx, y-prep.miny)
             else:
-                ctx.move_to(x, y)
+                ctx.move_to(x-prep.minx, y-prep.miny)
         self.last_force = 1
 
 try: