Cura/plugins/CuraEngineBackend/StartSliceJob.py

# Copyright (c) 2015 Ultimaker B.V.
# Cura is released under the terms of the AGPLv3 or higher.

import numpy
from string import Formatter
from enum import IntEnum

from UM.Job import Job
from UM.Application import Application
from UM.Logger import Logger

from UM.Scene.SceneNode import SceneNode
from UM.Scene.Iterator.DepthFirstIterator import DepthFirstIterator

from UM.Settings.Validator import ValidatorState

from cura.OneAtATimeIterator import OneAtATimeIterator

class StartJobResult(IntEnum):
    Finished = 1
    Error = 2
    SettingError = 3
    NothingToSlice = 4

##  Formatter class that handles token expansion in start/end gcod
class GcodeStartEndFormatter(Formatter):
    def get_value(self, key, args, kwargs):  # [CodeStyle: get_value is an overridden function from the Formatter class]
        if isinstance(key, str):
            try:
                return kwargs[key]
            except KeyError:
                Logger.log("w", "Unable to replace '%s' placeholder in start/end gcode", key)
                return "{" + key + "}"
        else:
            Logger.log("w", "Incorrectly formatted placeholder '%s' in start/end gcode", key)
            return "{" + str(key) + "}"

##  Job class that builds up the message of scene data to send to CuraEngine.
class StartSliceJob(Job):
    def __init__(self, slice_message):
        super().__init__()

        self._scene = Application.getInstance().getController().getScene()
        self._slice_message = slice_message
        self._is_cancelled = False

    def getSliceMessage(self):
        return self._slice_message

    ##  Check if a stack has any errors.
    ##  returns true if it has errors, false otherwise.
    def _checkStackForErrors(self, stack):
        if stack is None:
            return False

        for key in stack.getAllKeys():
            validation_state = stack.getProperty(key, "validationState")
            if validation_state in (ValidatorState.Exception, ValidatorState.MaximumError, ValidatorState.MinimumError):
                Logger.log("w", "Setting %s is not valid, but %s. Aborting slicing.", key, validation_state)
                return True
            Job.yieldThread()
        return False

    ##  Runs the job that initiates the slicing.
    def run(self):
        stack = Application.getInstance().getGlobalContainerStack()
        if not stack:
            self.setResult(StartJobResult.Error)
            return

        # Don't slice if there is a setting with an error value.
        if self._checkStackForErrors(stack):
            self.setResult(StartJobResult.SettingError)
            return

        # Don't slice if there is a per object setting with an error value.
        for node in DepthFirstIterator(self._scene.getRoot()):
            if type(node) is not SceneNode or not node.isSelectable():
                continue

            if self._checkStackForErrors(node.callDecoration("getStack")):
                self.setResult(StartJobResult.SettingError)
                return

        with self._scene.getSceneLock():
            # Remove old layer data.
            for node in DepthFirstIterator(self._scene.getRoot()):
                if node.callDecoration("getLayerData"):
                    node.getParent().removeChild(node)
                    break

            # Get the objects in their groups to print.
            object_groups = []
            if stack.getProperty("print_sequence", "value") == "one_at_a_time":
                for node in OneAtATimeIterator(self._scene.getRoot()):
                    temp_list = []

                    # Node can't be printed, so don't bother sending it.
                    if getattr(node, "_outside_buildarea", False):
                        continue

                    children = node.getAllChildren()
                    children.append(node)
                    for child_node in children:
                        if type(child_node) is SceneNode and child_node.getMeshData() and child_node.getMeshData().getVertices() is not None:
                            temp_list.append(child_node)

                    if temp_list:
                        object_groups.append(temp_list)
                    Job.yieldThread()
                if len(object_groups) == 0:
                    Logger.log("w", "No objects suitable for one at a time found, or no correct order found")
            else:
                temp_list = []
                for node in DepthFirstIterator(self._scene.getRoot()):
                    if type(node) is SceneNode and node.getMeshData() and node.getMeshData().getVertices() is not None:
                        if not getattr(node, "_outside_buildarea", False):
                            temp_list.append(node)
                    Job.yieldThread()

                if temp_list:
                    object_groups.append(temp_list)

            if not object_groups:
                self.setResult(StartJobResult.NothingToSlice)
                return

            self._buildGlobalSettingsMessage(stack)

            for group in object_groups:
                group_message = self._slice_message.addRepeatedMessage("object_lists")
                if group[0].getParent().callDecoration("isGroup"):
                    self._handlePerObjectSettings(group[0].getParent(), group_message)
                for object in group:
                    mesh_data = object.getMeshData().getTransformed(object.getWorldTransformation())

                    obj = group_message.addRepeatedMessage("objects")
                    obj.id = id(object)
                    verts = numpy.array(mesh_data.getVertices())

                    # Convert from Y up axes to Z up axes. Equals a 90 degree rotation.
                    verts[:, [1, 2]] = verts[:, [2, 1]]
                    verts[:, 1] *= -1

                    obj.vertices = verts

                    self._handlePerObjectSettings(object, obj)

                    Job.yieldThread()

        self.setResult(StartJobResult.Finished)

    def cancel(self):
        super().cancel()
        self._is_cancelled = True

    def isCancelled(self):
        return self._is_cancelled

    def _expandGcodeTokens(self, key, value, settings):
        try:
            # any setting can be used as a token
            fmt = GcodeStartEndFormatter()
            return str(fmt.format(value, **settings)).encode("utf-8")
        except:
            Logger.logException("w", "Unable to do token replacement on start/end gcode")
            return str(value).encode("utf-8")

    ##  Sends all global settings to the engine.
    #
    #   The settings are taken from the global stack. This does not include any
    #   per-extruder settings or per-object settings.
    def _buildGlobalSettingsMessage(self, stack):
        keys = stack.getAllKeys()
        settings = {}
        for key in keys:
            settings[key] = stack.getProperty(key, "value")

        start_gcode = settings["machine_start_gcode"]
        settings["material_bed_temp_prepend"] = "{material_bed_temperature}" not in start_gcode #Pre-compute material material_bed_temp_prepend and material_print_temp_prepend
        settings["material_print_temp_prepend"] = "{material_print_temperature}" not in start_gcode

        for key, value in settings.items(): #Add all submessages for each individual setting.
            setting_message = self._slice_message.getMessage("global_settings").addRepeatedMessage("settings")
            setting_message.name = key
            if key == "machine_start_gcode" or key == "machine_end_gcode": #If it's a g-code message, use special formatting.
                setting_message.value = self._expandGcodeTokens(key, value, settings)
            else:
                setting_message.value = str(value).encode("utf-8")

    def _handlePerObjectSettings(self, node, message):
        stack = node.callDecoration("getStack")
        if stack:
            for key in stack.getAllKeys():
                setting = message.addRepeatedMessage("settings")
                setting.name = key
                setting.value = str(stack.getProperty(key, "value")).encode("utf-8")
                Job.yieldThread()