Cura/plugins/LayerView/LayerView.py

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

from UM.View.View import View
from UM.View.Renderer import Renderer
from UM.Scene.Iterator.DepthFirstIterator import DepthFirstIterator
from UM.Resources import Resources
from UM.Event import Event, KeyEvent
from UM.Signal import Signal
from UM.Scene.Selection import Selection
from UM.Math.Color import Color
from UM.Mesh.MeshData import MeshData

from cura.ConvexHullNode import ConvexHullNode

from . import LayerViewProxy

## View used to display g-code paths.
class LayerView(View):
    def __init__(self):
        super().__init__()
        self._material = None
        self._num_layers = 0
        self._layer_percentage = 0 # what percentage of layers need to be shown (SLider gives value between 0 - 100)
        self._proxy = LayerViewProxy.LayerViewProxy()
        self._controller.getScene().sceneChanged.connect(self._onSceneChanged)
        self._max_layers = 10
        self._current_layer_num = 10
        self._current_layer_mesh = None
        self._activity = False

        self._solid_layers = 5

    def getActivity(self):
        return self._activity

    def getCurrentLayer(self):
        return self._current_layer_num
    
    def _onSceneChanged(self, node):
        self.calculateMaxLayers()
    
    def getMaxLayers(self):
        return self._max_layers

    def resetLayerData(self):
        self._current_layer_mesh = None

    def beginRendering(self):
        scene = self.getController().getScene()
        renderer = self.getRenderer()
        renderer.setRenderSelection(False)

        if not self._material:
            self._material = renderer.createMaterial(Resources.getPath(Resources.ShadersLocation, "basic.vert"), Resources.getPath(Resources.ShadersLocation, "vertexcolor.frag"))
            self._material.setUniformValue("u_color", [1.0, 0.0, 0.0, 1.0])

            self._selection_material = renderer.createMaterial(Resources.getPath(Resources.ShadersLocation, "basic.vert"), Resources.getPath(Resources.ShadersLocation, "color.frag"))
            self._selection_material.setUniformValue("u_color", Color(35, 35, 35, 128))

        for node in DepthFirstIterator(scene.getRoot()):
            # We do not want to render ConvexHullNode as it conflicts with the bottom layers.
            # However, it is somewhat relevant when the node is selected, so do render it then.
            if type(node) is ConvexHullNode and not Selection.isSelected(node.getWatchedNode()):
                continue

            if not node.render(renderer):
                if node.getMeshData() and node.isVisible():
                    if Selection.isSelected(node):
                        renderer.queueNode(node, material = self._selection_material, transparent = True)

                    try:
                        layer_data = node.getMeshData().layerData
                    except AttributeError:
                        continue

                    # Render all layers below a certain number as line mesh instead of vertices.
                    if self._current_layer_num - self._solid_layers > -1:
                        start = 0
                        end = 0
                        element_counts = layer_data.getElementCounts()
                        for layer, counts in element_counts.items():
                            if layer + self._solid_layers > self._current_layer_num:
                                break
                            end += counts

                        # This uses glDrawRangeElements internally to only draw a certain range of lines.
                        renderer.queueNode(node, mesh = layer_data, material = self._material, mode = Renderer.RenderLines, start = start, end = end)

                    # We currently recreate the current "solid" layers every time a
                    if not self._current_layer_mesh:
                        self._current_layer_mesh = MeshData()
                        for i in range(self._solid_layers):
                            layer = self._current_layer_num - i
                            if layer < 0:
                                continue

                            layer_mesh = layer_data.getLayer(layer).createMesh()
                            if not layer_mesh or layer_mesh.getVertices() is None:
                                continue

                            self._current_layer_mesh.addVertices(layer_mesh.getVertices())

                            # Scale layer color by a brightness factor based on the current layer number
                            # This will result in a range of 0.5 - 1.0 to multiply colors by.
                            brightness = (2.0 - (i / self._solid_layers)) / 2.0
                            self._current_layer_mesh.addColors(layer_mesh.getColors() * brightness)

                    renderer.queueNode(node, mesh = self._current_layer_mesh, material = self._material)

    def setLayer(self, value):
        if self._current_layer_num != value:
            self._current_layer_num = value
            if self._current_layer_num < 0:
                self._current_layer_num = 0
            if self._current_layer_num > self._max_layers:
                self._current_layer_num = self._max_layers

            self._current_layer_mesh = None
            self.currentLayerNumChanged.emit()

    currentLayerNumChanged = Signal()

    def calculateMaxLayers(self):
        scene = self.getController().getScene()
        renderer = self.getRenderer()
        if renderer and self._material:
            self._activity = True
            renderer.setRenderSelection(False)
            self._old_max_layers = self._max_layers
            ## Recalculate num max layers
            new_max_layers = 0
            for node in DepthFirstIterator(scene.getRoot()):
                if not node.render(renderer):
                    if node.getMeshData() and node.isVisible():
                        try:
                            layer_data = node.getMeshData().layerData
                        except AttributeError:
                            continue
                        if new_max_layers < len(layer_data.getLayers()):
                            new_max_layers = len(layer_data.getLayers()) - 1

            if new_max_layers > 0 and new_max_layers != self._old_max_layers:
                self._max_layers = new_max_layers
                self.maxLayersChanged.emit()
                self._current_layer_num = self._max_layers

                # This makes sure we update the current layer
                self.setLayer(int(self._max_layers * (self._current_layer_num / self._old_max_layers)))

    maxLayersChanged = Signal()
    
    ##  Hackish way to ensure the proxy is already created, which ensures that the layerview.qml is already created
    #   as this caused some issues. 
    def getProxy(self, engine, script_engine):
        return self._proxy
    
    def endRendering(self):
        pass
    
    def event(self, event):
        if event.type == Event.KeyPressEvent:
            if event.key == KeyEvent.UpKey:
                self.setLayer(self._current_layer_num + 1)
            if event.key == KeyEvent.DownKey:
                self.setLayer(self._current_layer_num - 1)