calculate bounding box after fixing up spaces

tools/gcode_center_outline.py

@@ -63,8 +63,11 @@ def main():
             print("File exists: " + f)
             sys.exit(1)
 
+    with open(in_file, 'r') as fi, open(out_tmp_file, 'w') as fo:
+        convert_gcode(fi, fo)
+
     bb = ( None, None, None, None )
-    with open(in_file, 'r') as f:
+    with open(out_tmp_file, 'r') as f:
         bb = file_bounding_box(f)
 
     x_min, x_max, y_min, y_max = bb
@@ -73,9 +76,6 @@ def main():
     off = ( -x_min + (machine_size[0] - size[0]) / 2.0, -y_min + (machine_size[1] - size[1]) / 2.0 )
     zero_point = ( -off[0], -off[1] )
 
-    with open(in_file, 'r') as fi, open(out_tmp_file, 'w') as fo:
-        convert_gcode(fi, fo)
-
     with open(out_tmp_file, 'r') as fi, open(out_file, 'w') as fo:
         patch_offset(fi, fo, zero_point)