changed behaviour of PolygonCutter and ContourCutter:

 * "finish" now appends new toolpath segments to previous ones (before: previous ones were thrown away)
 * now all PathProcessors keep previous toolpaths after calling "finish"


git-svn-id: https://pycam.svn.sourceforge.net/svnroot/pycam/trunk@467 bbaffbd6-741e-11dd-a85d-61de82d9cad9

src/pycam/PathGenerators/EngraveCutter.py

@@ -59,7 +59,6 @@ class EngraveCutter:
             z_steps = [minz]
         num_of_layers = len(z_steps)
 
-        paths = []
         current_layer = 0
         num_of_lines = len(self.contour_model.get_lines())
         progress_counter = ProgressCounter(len(z_steps) * num_of_lines,
@@ -81,21 +80,20 @@ class EngraveCutter:
                     if progress_counter.increment():
                         # cancel requested
                         quit_requested = True
+                        # finish the current path
+                        self.pa_push.finish()
                         break
             self.pa_push.finish()
 
-            # the path accumulator will be reset for each slice - we need to store the result
-            if self.pa_push.paths:
-                paths += self.pa_push.paths
-
             # break the outer loop if requested
             if quit_requested:
                 break
 
             current_layer += 1
 
+
         if quit_requested:
-            return paths
+            return self.pa_push.paths
 
         if draw_callback:
             draw_callback(text="Engrave: processing layer %d/%d" \
@@ -118,11 +116,8 @@ class EngraveCutter:
             if quit_requested:
                 break
         self.pa_drop.finish()
-        # the path accumulator will be reset for each slice - we need to store the result
-        if self.pa_drop.paths:
-            paths += self.pa_drop.paths
         
-        return paths
+        return self.pa_push.paths + self.pa_drop.paths
 
     def GenerateToolPathLinePush(self, pa, line, z, draw_callback=None):
         p1 = Point(line.p1.x, line.p1.y, z)

src/pycam/PathGenerators/PushCutter.py

@@ -53,8 +53,6 @@ class PushCutter:
         progress_counter = ProgressCounter(num_of_layers * lines_per_layer,
                 draw_callback)
 
-        paths = []
-
         current_layer = 0
 
         z_steps = [(maxz - i * z_step) for i in range(num_of_layers)]
@@ -77,13 +75,9 @@ class PushCutter:
                 self.pa.end_direction()
             self.pa.finish()
 
-            # the path accumulator will be reset for each slice - we need to store the result
-            if self.pa.paths:
-                paths += self.pa.paths
-
             current_layer += 1
 
-        return paths
+        return self.pa.paths
 
     def GenerateToolPathSlice(self, minx, maxx, miny, maxy, z, dx, dy,
             draw_callback=None, progress_counter=None):

src/pycam/PathProcessors/ContourCutter.py

@@ -55,16 +55,14 @@ class ContourCutter:
     def finish(self):
         self.pe.finish()
         if self.pe.merge_path_list:
-            self.paths = self.pe.merge_path_list
-            for p in self.paths:
-                p.append(p.points[0])
+            paths = self.pe.merge_path_list
+        elif self.pe.hor_path_list:
+            paths = self.pe.hor_path_list
         else:
-            if self.pe.hor_path_list:
-                self.paths = self.pe.hor_path_list
-            else:
-                self.paths = self.pe.ver_path_list
-            if self.paths:
-                for p in self.paths:
-                    p.append(p.points[0])
+            paths = self.pe.ver_path_list
+        if paths:
+            for p in paths:
+                p.append(p.points[0])
+        self.paths.extend(paths)
         self.pe = None
 

src/pycam/PathProcessors/PolygonCutter.py

@@ -65,5 +65,5 @@ class PolygonCutter:
                     p.append(points[-i-1])
                     p.append(points[i])
                 paths.append(p)
-        self.paths = paths
+        self.paths.extend(paths)