made a minimum step distance for the Gcode exporter to allow configs for...

made a minimum step distance for the Gcode exporter to allow configs for diferent resolution machines.  Also, the Gcode without this was making duplicate entries which causes the machine to stop and start inducing vibrations.

git-svn-id: https://pycam.svn.sourceforge.net/svnroot/pycam/trunk@925 bbaffbd6-741e-11dd-a85d-61de82d9cad9

src/pycam/Exporters/GCodeExporter.py

@@ -101,11 +101,28 @@ class GCodeGenerator:
         if self.toggle_spindle_status:
             self.append("M3 (start spindle)")
             self.append(self.gcode.delay(2))
+        # At minimum this will stop the duplicate gcode
+        # And this is a place holder for when the GUI is linked
+        ResLimitX = 0.0001
+        ResLimitY = 0.0001
+        ResLimitZ = 0.0001
+        OldPosition = None
         for pos, rapid in moves:
+            if OldPosition == None:
+                OldPosition = pos
+            NewPosition = pos
             if rapid:
                 self.append(self.gcode.rapid(pos.x, pos.y, pos.z))
             else:
-                self.append(self.gcode.cut(pos.x, pos.y, pos.z))
+                # make sure we arent putting out values with no motion
+                if NewPosition.x - OldPosition.x >= ResLimitX \
+                or NewPosition.x - OldPosition.x <= -ResLimitX \
+                or NewPosition.y - OldPosition.y >= ResLimitY \
+                or NewPosition.y - OldPosition.y <= -ResLimitY \
+                or NewPosition.z - OldPosition.z >= ResLimitZ \
+                or NewPosition.z - OldPosition.z <= -ResLimitZ:
+                    self.append(self.gcode.cut(pos.x, pos.y, pos.z))
+            OldPosition = pos
         # go back to safety height
         self.append(self.gcode.safety())
         if self.toggle_spindle_status: