fix a minor issue

README.md

@@ -6,7 +6,7 @@ This library is designed based on [pcb-tools](https://github.com/curtacircuitos/
 pcb-tools-extension adds following function  to pcb-tools.
 
 - Rotate PCB data
-- Write back loded PCB data (original PCB tools does not work completely)
+- Write back loaded PCB data (original pcb-tools does not work in some condition)
 - Merge multiple PCB data
 - Translate DXF file to gerber data
 
@@ -39,7 +39,7 @@ ctx.merge(metal2)
 ctx.dump('panelized-board.gtl')
 ```
 
-```rotate()``` method can be used to rotate PCB data counterclockwise. you have to specify angle in degree<br>
+```rotate()``` method can be used to rotate PCB data counterclockwise. you have to specify angle in degree.<br>
 ```offset()``` method can be used to move PCB data. Specified offset values are interpreted according to unit setting of PCB data. In case of the above code, ```board2.gtl``` move to 30mm left since ```to_metric()``` is called.
 
 In case of Excellon drill data, you have to use ```DrillCompositon``` instead of ```GerberComposition```.
@@ -88,7 +88,11 @@ dxf.write('outline.gml')
 ```
 
 You can also translate DXF closed shape such as circle to RX-274x polygon fill sequence.<br>
-In order to fill closed shape, ```DM_FILL``` has to be set to ```drawing_mode``` property. In this mode, All object except circle and closed polyline will be ignored.<br>
+In order to fill closed shape, ```DM_FILL``` has to be set to ```drawing_mode``` property. In this mode, All object except closed shapes listed below are ignored.
+
+- circle
+- closed polyline 
+- closed path which consist of lines and arcs
 
 ```python
 import gerberex

gerberex/dxf.py

@@ -259,7 +259,7 @@ class DxfPolylineStatement(DxfStatement):
         if self.is_closed:
             self.end = self.start
         else:
-            self.start = (self.entity.points[-1][0], self.entity.points[-1][1])
+            self.end = (self.entity.points[-1][0], self.entity.points[-1][1])
 
     def to_gerber(self, settings=FileSettings(), pitch=0, width=0):
         if pitch:
@@ -364,16 +364,14 @@ class DxfStatements(object):
         def gerbers():
             yield 'D{0}*'.format(self.dcode)
             if self.draw_mode == DxfFile.DM_FILL:
+                yield 'G36*'
                 for statement in self.statements:
-                    yield 'G36*'
                     if isinstance(statement, DxfCircleStatement) or \
                         (isinstance(statement, DxfPolylineStatement) and statement.entity.is_closed):
                         yield statement.to_gerber(settings)
-                    yield 'G37*'
                 for path in self.paths:
-                    yield 'G36*'
                     yield path.to_gerber(settings)
-                    yield 'G37*'
+                yield 'G37*'
             else:
                 for statement in self.statements:
                     yield statement.to_gerber(

gerberex/dxf_path.py

@@ -184,7 +184,7 @@ def generate_closed_paths(statements, error_range=0):
         working = []
         for i in range(len(paths)):
             mergee = paths[i]
-            for j in range(i + 1, len(paths) - 1):
+            for j in range(i + 1, len(paths)):
                 target = paths[j]
                 if target.merge(mergee, error_range):
                     break
@@ -192,6 +192,5 @@ def generate_closed_paths(statements, error_range=0):
                 working.append(mergee)
         prev_paths_num = len(paths)
         paths = working
-    
     return list(filter(lambda p: p.is_closed, paths))