Cura/PrintInformation.py

from PyQt5.QtCore import QObject, QDateTime, QTimer, pyqtSignal, pyqtSlot, pyqtProperty

from UM.Application import Application
from UM.Settings.MachineSettings import MachineSettings
from UM.Resources import Resources
from UM.Scene.SceneNode import SceneNode

##  A class for processing and calculating minimum, currrent and maximum print time.
#
#   This class contains all the logic relating to calculation and slicing for the
#   time/quality slider concept. It is a rather tricky combination of event handling
#   and state management. The logic behind this is as follows:
#
#   - A scene change or settting change event happens.
#        We track what the source was of the change, either a scene change, a setting change, an active machine change or something else.
#   - This triggers a new slice with the current settings - this is the "current settings pass".
#   - When the slice is done, we update the current print time and material amount.
#   - If the source of the slice was not a Setting change, we start the second slice pass, the "low quality settings pass". Otherwise we stop here.
#   - When that is done, we update the minimum print time and start the final slcice pass, the "high quality settings pass".
#   - When the high quality pass is done, we update the maximum print time.
#
class PrintInformation(QObject):
    class SlicePass:
        CurrentSettings = 1
        LowQualitySettings = 2
        HighQualitySettings = 3

    class SliceReason:
        SceneChanged = 1
        SettingChanged = 2
        ActiveMachineChanged = 3
        Other = 4

    def __init__(self, parent = None):
        super().__init__(parent)

        self._minimum_print_time = QDateTime()
        self._current_print_time = QDateTime()
        self._maximum_print_time = QDateTime()

        self._material_amount = -1

        self._time_quality_value = 50
        self._time_quality_changed_timer = QTimer()
        self._time_quality_changed_timer.setInterval(500)
        self._time_quality_changed_timer.setSingleShot(True)
        self._time_quality_changed_timer.timeout.connect(self._updateTimeQualitySettings)

        self._interpolation_settings = {
            "layer_height": { "minimum": "low", "maximum": "high", "curve": "linear" }
        }

        self._low_quality_settings = None
        self._current_settings = None
        self._high_quality_settings = None

        self._slice_pass = None
        self._slice_reason = None

        Application.getInstance().activeMachineChanged.connect(self._onActiveMachineChanged)
        self._onActiveMachineChanged()

        Application.getInstance().getController().getScene().sceneChanged.connect(self._onSceneChanged)

        self._backend = Application.getInstance().getBackend()
        if self._backend:
            self._backend.printDurationMessage.connect(self._onPrintDurationMessage)
            self._backend.slicingStarted.connect(self._onSlicingStarted)

    minimumPrintTimeChanged = pyqtSignal()
    @pyqtProperty(QDateTime, notify = minimumPrintTimeChanged)
    def minimumPrintTime(self):
        return self._minimum_print_time

    currentPrintTimeChanged = pyqtSignal()
    @pyqtProperty(QDateTime, notify = currentPrintTimeChanged)
    def currentPrintTime(self):
        return self._current_print_time

    maximumPrintTimeChanged = pyqtSignal()
    @pyqtProperty(QDateTime, notify = maximumPrintTimeChanged)
    def maximumPrintTime(self):
        return self._maximum_print_time

    materialAmountChanged = pyqtSignal()
    @pyqtProperty(float, notify = materialAmountChanged)
    def materialAmount(self):
        return self._material_amount

    timeQualityValueChanged = pyqtSignal()
    @pyqtProperty(int, notify = timeQualityValueChanged)
    def timeQualityValue(self):
        return self._time_quality_value

    @pyqtSlot(int)
    def setTimeQualityValue(self, value):
        if value != self._time_quality_value:
            self._time_quality_value = value
            self.timeQualityValueChanged.emit()

            self._time_quality_changed_timer.start()

    def _onSlicingStarted(self):
        if self._slice_pass is None:
            self._slice_pass = self.SlicePass.CurrentSettings

        if self._slice_reason is None:
            self._slice_reason = self.SliceReason.Other

    def _onPrintDurationMessage(self, time, amount):
        if self._slice_pass == self.SlicePass.CurrentSettings:
            self._current_print_time = QDateTime.fromMSecsSinceEpoch(round(time * 1000))
            self.currentPrintTimeChanged.emit()

            self._material_amount = round(amount / 10) / 100
            self.materialAmountChanged.emit()

            if self._slice_reason != self.SliceReason.SettingChanged:
                self._slice_pass = self.SlicePass.LowQualitySettings
                self._backend.slice(settings = self._low_quality_settings, save_gcode = False, save_polygons = False, force_restart = False, report_progress = False)
            else:
                self._slice_pass = None
                self._slice_reason = None

        elif self._slice_pass == self.SlicePass.LowQualitySettings:
            self._minimum_print_time = QDateTime.fromMSecsSinceEpoch(round(time * 1000))
            self.minimumPrintTimeChanged.emit()

            self._slice_pass = self.SlicePass.HighQualitySettings
            self._backend.slice(settings = self._high_quality_settings, save_gcode = False, save_polygons = False, force_restart = False, report_progress = False)
        elif self._slice_pass == self.SlicePass.HighQualitySettings:
            self._maximum_print_time = QDateTime.fromMSecsSinceEpoch(round(time * 1000))
            self.maximumPrintTimeChanged.emit()

            self._slice_pass = None
            self._slice_reason = None

    def _onActiveMachineChanged(self):
        if self._current_settings:
            self._current_settings.settingChanged.disconnect(self._onSettingChanged)

        self._current_settings = Application.getInstance().getActiveMachine()

        if self._current_settings:
            self._current_settings.settingChanged.connect(self._onSettingChanged)
            self._low_quality_settings = None
            self._high_quality_settings = None
            self._updateTimeQualitySettings()

            self._slice_reason = self.SliceReason.ActiveMachineChanged

    def _updateTimeQualitySettings(self):
        if not self._current_settings:
            return

        if not self._low_quality_settings:
            self._low_quality_settings = MachineSettings()
            self._low_quality_settings.loadSettingsFromFile(Resources.getPath(Resources.SettingsLocation, self._current_settings.getTypeID() + '.json'))
            self._low_quality_settings.loadValuesFromFile(Resources.getPath(Resources.SettingsLocation, 'profiles', 'low_quality.conf'))

        if not self._high_quality_settings:
            self._high_quality_settings = MachineSettings()
            self._high_quality_settings.loadSettingsFromFile(Resources.getPath(Resources.SettingsLocation, self._current_settings.getTypeID() + '.json'))
            self._high_quality_settings.loadValuesFromFile(Resources.getPath(Resources.SettingsLocation, 'profiles', 'high_quality.conf'))

        for key, options in self._interpolation_settings.items():
            minimum_value = None
            if options['minimum'] == 'low':
                minimum_value = self._low_quality_settings.getSettingValueByKey(key)
            elif options['minimum'] == 'high':
                minimum_value = self._high_quality_settings.getSettingValueByKey(key)
            else:
                continue

            maximum_value = None
            if options['maximum'] == 'low':
                maximum_value = self._low_quality_settings.getSettingValueByKey(key)
            elif options['maximum'] == 'high':
                maximum_value = self._high_quality_settings.getSettingValueByKey(key)
            else:
                continue

            setting_value = minimum_value + (maximum_value - minimum_value) * (self._time_quality_value / 100)
            self._current_settings.setSettingValueByKey(key, setting_value)

    def _onSceneChanged(self, source):
        self._slice_reason = self.SliceReason.SceneChanged

    def _onSettingChanged(self, source):
        self._slice_reason = self.SliceReason.SettingChanged