moved partial toolpath reading (for simulation) to a separate filter

* additional TimeLimit filter
* read feedrate and safety height from configured toolpath filters

pycam/Plugins/OpenGLViewToolpath.py

@@ -79,7 +79,6 @@ class OpenGLViewToolpath(pycam.Plugins.PluginBase):
                 # TODO: enable the VBO code for speedup!
                 #moves = toolpath.get_moves_for_opengl(self.core.get("gcode_safety_height"))
                 #self._draw_toolpath_moves2(moves)
-                toolpath._update_safety_height(self.core.get("gcode_safety_height"))
                 moves = toolpath.get_basic_moves()
                 self._draw_toolpath_moves(moves)
             

pycam/Plugins/ToolpathExport.py

@@ -171,7 +171,7 @@ class ToolpathExport(pycam.Plugins.PluginBase):
             machine_time = 0
             # calculate the machine time and store it in the GCode header
             for toolpath in toolpaths:
-                machine_time += toolpath.get_machine_time(safety_height)
+                machine_time += toolpath.get_machine_time()
             all_info = meta_data + os.linesep \
                     + "Estimated machine time: %.0f minutes" % machine_time
             minimum_steps = [self.core.get("gcode_minimum_step_x"),  
@@ -219,7 +219,6 @@ class ToolpathExport(pycam.Plugins.PluginBase):
                 spindle_speed = params.get("spindle_speed", 1000)
                 generator.set_speed(feedrate, spindle_speed)
                 # TODO: implement toolpath.get_meta_data()
-                toolpath._update_safety_height(safety_height)
                 generator.add_moves(toolpath.get_basic_moves(),
                         tool_id=tool_id, comment="")
             generator.finish()

pycam/Plugins/ToolpathSimulation.py

@@ -94,14 +94,9 @@ class ToolpathSimulation(pycam.Plugins.PluginBase):
             # we use only one toolpath
             self._toolpath = toolpaths[0]
             # calculate steps
-            self._safety_height = self.core.get("gcode_safety_height")
-            self._progress.set_upper(self._toolpath.get_machine_time(
-                    safety_height=self._safety_height))
+            self._duration = self._toolpath.get_machine_move_distance_and_time()[1]
+            self._progress.set_upper(self._duration)
             self._progress.set_value(0)
-            self._distance = self._toolpath.get_machine_move_distance(
-                        safety_height=self._safety_height)
-            self._feedrate = self._toolpath.get_params().get("tool_feedrate",
-                    300)
             self._toolpath_moves = None
             self.core.set("show_simulation", True)
             self._running = True
@@ -157,8 +152,7 @@ class ToolpathSimulation(pycam.Plugins.PluginBase):
                     seconds=int(self._progress.get_upper()))
             self._timer_widget.set_label("%s / %s" % (current, complete))
             self._toolpath_moves = self._toolpath.get_moves(
-                    safety_height=self._safety_height,
-                    max_movement=self._distance * fraction)
+                    max_time=self._duration * fraction)
             self.core.emit_event("visual-item-updated")
 
     def show_simulation(self):
@@ -174,7 +168,7 @@ class ToolpathSimulation(pycam.Plugins.PluginBase):
                 return
             else:
                 toolpath = self.toolpath[toolpath_index]
-        paths = toolpath.paths
+        paths = toolpath.path
         # set the current cutter
         self.cutter = pycam.Cutters.get_tool_from_settings(
                 toolpath.get_tool_settings())

pycam/Toolpath/Filters.py

@@ -21,8 +21,10 @@ along with PyCAM.  If not, see <http://www.gnu.org/licenses/>.
 """
 
 
-from pycam.Toolpath import MOVE_STRAIGHT, MOVE_STRAIGHT_RAPID, MOVE_SAFETY, MACHINE_SETTING
-from pycam.Geometry.PointUtils import psub, pdist, ptransform_by_matrix
+from pycam.Toolpath import MOVE_STRAIGHT, MOVE_STRAIGHT_RAPID, MOVE_SAFETY, \
+        MACHINE_SETTING
+from pycam.Geometry.PointUtils import padd, psub, pmul, pdist, \
+        ptransform_by_matrix
 from pycam.Geometry.Line import Line
 from pycam.Geometry.utils import epsilon
 import pycam.Utils.log
@@ -192,3 +194,39 @@ class TransformPosition(BaseFilter):
                 new_path.append((move_type, args))
         return new_path
 
+
+class TimeLimit(BaseFilter):
+    """ This filter is used for the toolpath simulation. It returns only a
+    partial toolpath within a given duration limit.
+    """
+
+    PARAMS = ("timelimit", )
+
+    def filter_toolpath(self, toolpath):
+        feedrate = min_feedrate = 1
+        new_path = []
+        last_pos = None
+        limit = self.settings["timelimit"]
+        duration = 0
+        for move_type, args in toolpath:
+            if move_type in (MOVE_STRAIGHT, MOVE_STRAIGHT_RAPID):
+                if last_pos:
+                    new_distance = pdist(args, last_pos)
+                    new_duration = new_distance / max(feedrate, min_feedrate)
+                    if (new_duration > 0) and (duration + new_duration > limit):
+                        partial = (limit - duration) / new_duration
+                        destination = padd(last_pos, pmul(psub(args, last_pos), partial))
+                        duration = limit
+                    else:
+                        destination = args
+                        duration += new_duration
+                else:
+                    destination = args
+                new_path.append((move_type, destination))
+                last_pos = args
+            if (move_type == MACHINE_SETTING) and (args[0] == "feedrate"):
+                feedrate = args[1]
+            if duration >= limit:
+                break
+        return new_path
+

pycam/Toolpath/__init__.py

@@ -155,74 +155,8 @@ class Toolpath(object):
         end_marker = self.toolpath_settings.META_MARKER_END
         return os.linesep.join((start_marker, meta, end_marker))
 
-    def get_moves(self, safety_height, max_movement=None):
-        self._update_safety_height(safety_height)
-        class MoveContainer(object):
-            def __init__(self, max_movement):
-                self.max_movement = max_movement
-                self.moved_distance = 0
-                self.moves = []
-                self.last_pos = None
-                if max_movement is None:
-                    self.append = self.append_without_movement_limit
-                else:
-                    self.append = self.append_with_movement_limit
-            def append_with_movement_limit(self, new_position, rapid):
-                if self.last_pos is None:
-                    # first move with unknown start position - ignore it
-                    self.moves.append((new_position, rapid))
-                    self.last_pos = new_position
-                    return True
-                else:
-                    distance = pdist(new_position, self.last_pos)
-                    if self.moved_distance + distance > self.max_movement:
-                        partial = (self.max_movement - self.moved_distance) / \
-                                distance
-                        partial_dest = padd(self.last_pos, pmul(psub(new_position, self.last_pos), partial))
-                        self.moves.append((partial_dest, rapid))
-                        self.last_pos = partial_dest
-                        # we are finished
-                        return False
-                    else:
-                        self.moves.append((new_position, rapid))
-                        self.moved_distance += distance
-                        self.last_pos = new_position
-                        return True
-            def append_without_movement_limit(self, new_position, rapid):
-                self.moves.append((new_position, rapid))
-                return True
-        p_last = None
-        result = MoveContainer(max_movement)
-        for path in self.path:
-            if not path:
-                # ignore empty paths
-                continue
-            p_next = path[0]
-            if p_last is None:
-                p_last = (p_next[0], p_next[1], safety_height)
-                if not result.append(p_last, True):
-                    return result.moves
-            if ((abs(p_last[0] - p_next[0]) > epsilon) or (abs(p_last[1] - p_next[1]) > epsilon)):
-                # Draw the connection between the last and the next path.
-                # Respect the safety height.
-                if (abs(p_last[2] - p_next[2]) > epsilon) or (pdist(p_last, p_next) > self._max_safe_distance + epsilon):
-                    # The distance between these two points is too far.
-                    # This condition helps to prevent moves up/down for
-                    # adjacent lines.
-                    safety_last = (p_last[0], p_last[1], safety_height)
-                    safety_next = (p_next[0], p_next[1], safety_height)
-                    if not result.append(safety_last, True):
-                        return result.moves
-                    if not result.append(safety_next, True):
-                        return result.moves
-            for p in path.points:
-                if not result.append(p, False):
-                    return result.moves
-            p_last = path.points[-1]
-        if not p_last is None:
-            p_last_safety = (p_last[0], p_last[1], safety_height)
-            result.append(p_last_safety, True)
-        return result.moves
+    def get_moves(self, max_time=None):
+        return self.get_basic_moves() | pycam.Toolpath.Filters.TimeLimit(max_time)
 
     def _rotate_point(self, rp, sp, v, angle):
         vx = v[0]
@@ -339,38 +273,42 @@ class Toolpath(object):
         self.opengl_safety_height = safety_height
         self.opengl_lines = outpaths
 
+    def get_machine_setting(self, key, default=None):
+        """ look for the first appearance of a machine setting (e.g. feedrate,
+        safety height, metric/imperial, ...). Additional occourences of this
+        setting are ignored.
+        """
+        for move_type, args in self.path:
+            if (move_type == MACHINE_SETTING) and (key == args[0]):
+                return args[1]
+        return default
+        
     def get_machine_time(self, safety_height=0.0):
         """ calculate an estimation of the time required for processing the
         toolpath with the machine
 
-        @value safety_height: the safety height configured for this toolpath
-        @type safety_height: float
         @rtype: float
         @returns: the machine time used for processing the toolpath in minutes
         """
-        return self.get_machine_move_distance(safety_height) / self._feedrate
-
-    def _update_safety_height(self, safety_height):
-        # TODO: remove this ugly hack!
-        from pycam.Toolpath.Filters import SafetyHeightFilter
-        for index in range(len(self.filters)):
-            if isinstance(self.filters[index], SafetyHeightFilter) and \
-                    (self.filters[index].settings["safety_height"] != safety_height):
-                self.filters[index] = SafetyHeightFilter(safety_height)
-                self.get_basic_moves(reset_cache=True)
-                break
+        return self.get_machine_move_distance_and_time()[1]
 
-    def get_machine_move_distance(self, safety_height):
-        result = 0
+    def get_machine_move_distance_and_time(self):
+        min_feedrate = 1
+        length = 0
+        duration = 0
+        feed_rate = min_feedrate
         current_position = None
-        self._update_safety_height(safety_height)
         # go through all points of the path
         for move_type, args in self.get_basic_moves():
-            if move_type in (MOVE_STRAIGHT, MOVE_STRAIGHT_RAPID):
+            if (move_type == MACHINE_SETTING) and (args[0] == "feedrate"):
+                feedrate = args[1]
+            elif move_type in (MOVE_STRAIGHT, MOVE_STRAIGHT_RAPID):
                 if not current_position is None:
-                    result += pdist(args, current_position)
+                    distance = pdist(args, current_position)
+                    duration += distance / max(feedrate, min_feedrate)
+                    length += distance
                 current_position = args
-        return result
+        return length, duration
 
     def get_basic_moves(self, reset_cache=False):
         if reset_cache or not self._cache_basic_moves: