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
import traceback

from UM.Application import Application
from UM.Settings.DefinitionContainer import DefinitionContainer
from UM.Job import Job
from UM.Logger import Logger

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

from cura.OneAtATimeIterator import OneAtATimeIterator


##  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 that handles sending the current scene data to CuraEngine
class StartSliceJob(Job):
    def __init__(self, socket):
        super().__init__()

        self._scene = Application.getInstance().getController().getScene()
        self._socket = socket

    ##  Runs the job that initiates the slicing.
    def run(self):
        self._scene.acquireLock()

        # 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 self._profile.getSettingValue("print_sequence") == "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)

        self._scene.releaseLock()

        if not object_groups:
            return

        self._sendGlobalSettings()

        slice_message = self._socket.createMessage("cura.proto.Slice")

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

                obj = group_message.addRepeatedMessage("objects")
                obj.id = id(current_object)

                verts = numpy.array(mesh_data.getVertices())
                verts[:,[1,2]] = verts[:,[2,1]]
                verts[:,1] *= -1

                obj.vertices = verts

                self._handlePerObjectSettings(current_object, obj)

                Job.yieldThread()

        Logger.log("d", "Sending data to engine for slicing.")
        self._socket.sendMessage(slice_message)
        Logger.log("d", "Sending data to engine is completed")
        self.setResult(True)

    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.log("w", "Unabled to do token replacement on start/end gcode %s", traceback.format_exc())
            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 _sendGlobalSettings(self):
        message = self._socket.createMessage("cura.proto.SettingList")
        settings = self._getAllSettingValues() #Get all the settings to send.
        start_gcode = settings["machine_start_gcode"]
        settings["material_bed_temp_prepend"] = "{material_bed_temperature}" not in start_gcode #Pre-compute 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 = message.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")

        self._socket.sendMessage(message)

    def _handlePerObjectSettings(self, node, message):
        profile = node.callDecoration("getProfile")
        if profile:
            for key, value in profile.getAllSettingValues().items():
                setting = message.addRepeatedMessage("settings")
                setting.name = key
                setting.value = str(value).encode()

                Job.yieldThread()

        object_settings = node.callDecoration("getAllSettingValues")
        if not object_settings:
            return
        for key, value in object_settings.items():
            setting = message.addRepeatedMessage("settings")
            setting.name = key
            setting.value = str(value).encode()

            Job.yieldThread()

    ##  Gets all setting values as a dictionary.
    #
    #   \return A dictionary with the setting keys as keys and the setting
    #   values as values.
    def _getAllSettingValues(self):
        stack = Application.getInstance().getGlobalContainerStack()
        setting_values = {}

        definition_containers = [container for container in stack.getContainers() if container.__class__ == DefinitionContainer] #To get all keys, get all definitions from all definition containers.
        for definition_container in definition_containers:
            for definition in definition_container.definitions:
                if definition.key not in setting_values: #Prevent looking up the same key twice, for speed.
                    setting_values[definition.key] = stack.getProperty(definition.key, "value")

        return setting_values