def _make_wire_item(x1, y1, x2, y2):
path = QPainterPath()
path.moveTo(x1, y1)
path.lineTo(x2, y2)
path_item = QGraphicsPathItem(path)
stroker = QPainterPathStroker(QPen(Qt.black, 5, c=Qt.RoundCap))
stroke_path = stroker.createStroke(path)
stroke_item = QGraphicsPathItem(stroke_path)
path_item.setPen(QPen(Qt.white, 5, c=Qt.RoundCap))
stroke_item.setPen(QPen(Qt.black, 1.5, c=Qt.RoundCap))
group = QGraphicsItemGroup()
group.addToGroup(path_item)
group.addToGroup(stroke_item)
group.setFlag(QGraphicsItem.ItemIsSelectable)
return group
class SectionScene(QGraphicsScene):
def __init__(self, section, model, commodity_types, process_cores):
super().__init__()
self._grid_size = QSize(GRID_WIDTH, GRID_HEIGHT)
self._drop_indicator = self.init_drop_indicator()
self._process_items = QGraphicsItemGroup()
self._commodity_items = List([])
self._bounding_rect = BoundingRect(section, model.process_list,
commodity_types)
self._clicked_item = None
self._item_mouse_offset = None
self._connect_line = None
self._items_border = QRect()
self._grid_border = QRect()
self._section = section
self._model = model
self._cores = process_cores
self._edit_mode = SelectConnect.SELECT
self._draft_mode = False
self.init_scene()
@property
def edit_mode(self):
return self._edit_mode
@edit_mode.setter
def edit_mode(self, value):
if value in SelectConnect:
self._edit_mode = value
if value == SelectConnect.SELECT:
self._process_items.setFlag(QGraphicsItem.ItemIsMovable)
else:
self._process_items.setFlag(QGraphicsItem.ItemIsMovable, False)
else:
raise TypeError
@property
def draft_mode(self):
return self._draft_mode
@draft_mode.setter
def draft_mode(self, value):
if value in [True, False]:
self._draft_mode = value
self._process_items.setFlag(QGraphicsItem.ItemIsMovable, value)
else:
raise TypeError
def init_scene(self):
"""initialize content of scene based on list of elements"""
for process in self._model.process_list:
if process.core.section == self._section:
process_item = self.draw_process(process)
self.draw_connection(process_item)
self.draw_connection(process_item, False)
self.update_commodities()
def draw_commodity(self, commodity):
"""create commodity item"""
commodity_item = CommodityItem(commodity.locations[self._section],
self._bounding_rect)
commodity_item.setData(0, commodity)
commodity_item.setData(1, 0)
self.addItem(commodity_item)
return commodity_item
def draw_connection(self, process_item, input_com=True):
commodity_types = []
process = process_item.data(0)
connections = process_item.data(1)
# define necessary connections to commodity item
commodities = process.inputs if input_com else process.outputs
for commodity in commodities:
if commodity.commodity_type not in commodity_types:
commodity_types.append(commodity.commodity_type)
commodity_difference = PROCESS_SIZE / (len(commodity_types) + 1)
for commodity_type in commodity_types:
commodity_position = commodity_type.locations[self._section]
item_position = process.coordinate.x() + PROCESS_SIZE / 2
# set item_position to left/right border of process depending on commodity_position
if commodity_position < item_position:
item_position -= PROCESS_SIZE
start_position = commodity_position if input_com else item_position
end_position = item_position if input_com else commodity_position
commodity_item = [
item for item in self._commodity_items
if item.data(0) is commodity_type
]
connection_item = [
connection for connection in connections
if connection.data(1) is commodity_item
]
if commodity_item:
commodity_item = commodity_item[0]
else:
# create new commodity item
commodity_item = self.draw_commodity(commodity_type)
self._commodity_items.add(commodity_item)
if connection_item:
connection_item = connection_item[0]
else:
# ignore second double arrow for storage processes if start_position is left of end_position
if (process.core.category is ProcessCategory.STORAGE) & (
end_position - start_position < 0):
return
# create new connection item
connection_item = ConnectionItem(
end_position - start_position,
process.core.category is ProcessCategory.STORAGE)
commodity_item.setData(1, commodity_item.data(1) + 1)
connection_item.setData(1, commodity_item)
connection_list = process_item.data(1)
connection_list.append(connection_item)
process_item.setData(1, connection_list)
connection_item.setX(start_position)
index = commodity_types.index(commodity_type) + 1
connection_item.setY(process.coordinate.y() - PROCESS_SIZE / 2 +
commodity_difference * index)
self.addItem(connection_item)
def draw_process(self, process):
"""create process item and add to scene & process items list"""
process_item = ProcessItem(process.core.icon)
process_item.setData(0, process)
process_item.setData(1, [])
process_item.setPos(process.coordinate)
process_item.setFlag(QGraphicsItem.ItemIsMovable)
self._process_items.prepareGeometryChange()
self._process_items.addToGroup(process_item)
self.addItem(process_item)
return process_item
def delete_process(self, item):
process = item.data(0)
self._model.process_list.remove(process)
# remove all connection items and the commodity item if applicable
for connection_item in item.data(1):
commodity_item = connection_item.data(1)
commodity_references = commodity_item.data(1) - 1
commodity_item.setData(1, commodity_references)
if commodity_references == 0:
# remove commodity of section count and commodity item
commodity_item.data(0).locations.remove(self._section)
self._commodity_items.remove(commodity_item)
self.removeItem(commodity_item)
self.removeItem(connection_item)
# reduce connection count of all commodities connected to process
for input_com in process.inputs:
input_com.connection_count[self._section] -= 1
if input_com.connection_count[self._section] == 0:
input_com.connection_count.remove(self._section)
if not input_com.connection_count:
self._model.commodity_list.remove(input_com)
for output in process.outputs:
output.connection_count[self._section] -= 1
if output.connection_count[self._section] == 0:
output.connection_count.remove(self._section)
if not output.connection_count:
self._model.commodity_list.remove(output)
self._process_items.removeFromGroup(item)
self.removeItem(item)
self.update_commodities()
def init_drop_indicator(self):
rect = QRect(-DROP_INDICATOR_SIZE / 2, -DROP_INDICATOR_SIZE / 2,
DROP_INDICATOR_SIZE, DROP_INDICATOR_SIZE)
brush = QBrush(Qt.darkBlue)
pen = QPen(Qt.darkBlue, 1)
ellipse = self.addEllipse(rect, pen, brush)
ellipse.setVisible(False)
return ellipse
def disable_drop_indicator(self):
self._drop_indicator.setX(-DROP_INDICATOR_SIZE / 2)
self._drop_indicator.setY(-DROP_INDICATOR_SIZE / 2)
self._drop_indicator.setVisible(False)
self.update()
def align_drop_indicator(self, point):
"""align the drop indicator to grid while mouse movement"""
# move drop indicator only within grid boundaries
if not self.get_grid_border(-MIN_GRID_MARGIN).contains(
point.toPoint()):
self._drop_indicator.setVisible(False)
return
# calculate the nearby position of grid interceptions
grid_x = (round(point.x() / self._grid_size.width() / 2 - 1 / 2) * 2 +
1) * self._grid_size.width()
grid_y = round(
point.y() / self._grid_size.height()) * self._grid_size.height()
# move drop indicator to grid interception
self._drop_indicator.setX(grid_x)
self._drop_indicator.setY(grid_y)
self._drop_indicator.setVisible(True)
self.update()
def get_grid_border(self, margin=0):
def get_raster_length(length, raster):
return (int((length + MIN_GRID_MARGIN + raster / 2) / raster) -
1 / 2) * raster
left = get_raster_length(self.sceneRect().left(),
self._grid_size.width())
right = get_raster_length(self.sceneRect().right(),
self._grid_size.width())
top = get_raster_length(self.sceneRect().top(),
self._grid_size.height())
bottom = get_raster_length(self.sceneRect().bottom(),
self._grid_size.height())
return QRect(left, top, right - left, bottom - top).marginsAdded(
QMargins(margin, margin, margin, margin))
def execute_connection(self, item, position):
if not self._connect_line:
if self.show_connection_menu(item, position):
return
else:
selected_commodity = self._connect_line.data(1)
if isinstance(item, ProcessItem):
# create incoming connection
if selected_commodity in item.data(0).core.inputs:
if self._connect_line.data(0) is None:
# establish connection from commodity
if selected_commodity not in item.data(0).inputs:
self.connect_process(item.data(0),
selected_commodity, False)
self.draw_connection(item)
else:
# establish connection between processes
self.connect_processes(selected_commodity,
self._connect_line.data(0),
item)
elif item is None:
# create outgoing connection
menu = QMenu()
menu.addAction("> Commodity")
if menu.exec_(QCursor.pos()):
self.connect_process(
self._connect_line.data(0).data(0), selected_commodity)
self.draw_connection(self._connect_line.data(0), False)
# end connection
self.views()[1].setMouseTracking(False)
self.removeItem(self._connect_line)
self._connect_line = None
def show_connection_menu(self, item, position):
menu = QMenu()
# add all output commodities of process to menu
for commodity in item.data(0).core.outputs:
action = menu.addAction(str(commodity))
action.setData(commodity)
# execute menu
action = menu.exec_(QCursor.pos())
if action:
# start connection
line_pen = QPen(Qt.lightGray, 1, Qt.DashLine)
line = QLineF(position, position)
self._connect_line = self.addLine(line, line_pen)
self._connect_line.setData(0, item)
self._connect_line.setData(1, action.data())
self.views()[1].setMouseTracking(True)
return True
return False
def connect_processes(self, selected_commodity, start_process_item,
end_process_item):
# establish connection
connect_commodity = None
commodity_in_input = False
commodity_in_output = False
start_process = start_process_item.data(0)
end_process = end_process_item.data(0)
# check if selected_commodity is in outputs or inputs of related processes
outputs = start_process.outputs
if selected_commodity in outputs:
commodity_in_output = True
connect_commodity = outputs[outputs.index(selected_commodity)]
inputs = end_process.inputs
if selected_commodity in inputs:
commodity_in_input = True
connect_commodity = inputs[inputs.index(selected_commodity)]
# determine necessary connection steps
if commodity_in_input & commodity_in_output:
# selected_commodity already exists in input and output -> connection exists
QMessageBox.warning(self.views()[1], "Connection exists",
"Connection already established",
QMessageBox.Ok)
return
elif commodity_in_input:
# add commodity to output of start process
self.connect_process(start_process, connect_commodity)
self.draw_connection(start_process_item, False)
elif commodity_in_output:
# add commodity to input of end process
self.connect_process(end_process, connect_commodity, False)
self.draw_connection(end_process_item)
else:
# establish new commodity in both processes
connect_commodity = selected_commodity.copy()
self.connect_process(start_process, connect_commodity)
self.connect_process(end_process, connect_commodity, False)
self.draw_connection(start_process_item, False)
self.draw_connection(end_process_item)
def connect_process(self, process, commodity, output=True):
if self._section not in commodity.connection_count.keys():
commodity.connection_count[self._section] = 0
if commodity not in self._model.commodity_list:
self._model.commodity_list.add(commodity)
commodity.connection_count[self._section] += 1
commodity_list = process.outputs if output else process.inputs
commodity_list.add(commodity)
# add commodity in input and output list
if process.core.category is ProcessCategory.STORAGE:
commodity_list = process.outputs if not output else process.inputs
commodity_list.add(commodity)
self.set_commodity_position(commodity.commodity_type, process, output)
def set_commodity_position(self, commodity_type, process, right=True):
"""changes the commodity position according to newly connected process"""
if self._section not in commodity_type.locations.keys():
# set initial position to right of process
location = process.coordinate.x() + self._grid_size.width() * (
1 if right else -1)
commodity_type.locations[self._section] = location
else:
# todo change position based on newly connected process
pass
def update_commodities(self):
"""update length of commodity line based on bounding rect"""
self._bounding_rect.update()
top_border = self._bounding_rect.top()
height_border = self._bounding_rect.height()
for commodity_item in self._commodity_items:
commodity_item.update_line(top_border, height_border)
def drawBackground(self, painter, rect):
if self.draft_mode:
border_rect = self.get_grid_border()
grid_rect = self.get_grid_border(-self._grid_size.width() / 2)
line_list = []
# horizontal grid lines
for line_coordinate in range(grid_rect.top(), border_rect.bottom(),
self._grid_size.height()):
line_list.append(
QLineF(border_rect.left(), line_coordinate,
border_rect.right(), line_coordinate))
# vertical process lines
left_border = int((grid_rect.left() + self._grid_size.width()) / (2 * self._grid_size.width())) * \
self._grid_size.width() * 2 - self._grid_size.width()
for line_coordinate in range(left_border, border_rect.right(),
self._grid_size.width() * 2):
line_list.append(
QLineF(line_coordinate, border_rect.top(), line_coordinate,
border_rect.bottom()))
# vertical commodity lines
left_border = int(
grid_rect.left() /
(2 * self._grid_size.width())) * self._grid_size.width() * 2
for line_coordinate in range(left_border, border_rect.right(),
self._grid_size.width() * 2):
line_list.append(
QLineF(line_coordinate - 1, border_rect.top(),
line_coordinate - 1, border_rect.bottom()))
line_list.append(
QLineF(line_coordinate + 1, border_rect.top(),
line_coordinate + 1, border_rect.bottom()))
painter.setPen(QPen(Qt.lightGray, 1))
painter.drawLines(line_list)
super().drawBackground(painter, rect)
def mousePressEvent(self, event):
# ignore right button click
if event.button() == Qt.RightButton:
return
self._clicked_item = self.itemAt(event.scenePos(), QTransform())
if self.draft_mode & (self.edit_mode == SelectConnect.SELECT):
if isinstance(self._clicked_item, ProcessItem):
self._clicked_item.setOpacity(0.5)
self._drop_indicator.setPos(self._clicked_item.pos())
self._drop_indicator.setVisible(True)
# set offset between mouse and center of item for mouseMoveEvent
self._item_mouse_offset = self._clicked_item.mapFromScene(
event.scenePos())
else:
self._clicked_item = None
def mouseMoveEvent(self, event):
if self.draft_mode:
if self.edit_mode == SelectConnect.SELECT:
if self._clicked_item:
# move drop indicator along grid and process item according to mouse position
self.align_drop_indicator(event.scenePos() -
self._item_mouse_offset)
self._clicked_item.setPos(event.scenePos() -
self._item_mouse_offset)
elif self._connect_line:
# update connect line in CONNECT mode
line = self._connect_line.line()
# add offset to position to avoid itemAt function to return lineItem
line.setP2(event.scenePos() - QPoint(2, 2))
self._connect_line.setLine(line)
super().mouseMoveEvent(event)
def mouseReleaseEvent(self, event):
# normal mode
if not self.draft_mode:
if event.button() == Qt.LeftButton:
# toggle sidebar with properties
clicked_item = self.itemAt(event.scenePos(), QTransform())
if self._clicked_item:
if isinstance(clicked_item, ProcessItem):
self.views()[0].sidebar_toggled.emit(
clicked_item.data(0))
self.views()[0].commodity_clicked.emit(None)
elif isinstance(clicked_item, CommodityItem):
self.views()[0].sidebar_toggled.emit(None)
self.views()[0].commodity_clicked.emit(
clicked_item.data(0))
else:
self.views()[0].sidebar_toggled.emit(None)
self.views()[0].commodity_clicked.emit(None)
else:
self.views()[0].sidebar_toggled.emit(None)
self.views()[0].commodity_clicked.emit(None)
return
# draft mode in selection
if self.edit_mode == SelectConnect.SELECT:
# release process item
if self._clicked_item:
self._clicked_item.setOpacity(1.0)
# remove clicked item from collision list with drop indicator
collision_items = self.collidingItems(self._drop_indicator)
if collision_items:
collision_items.remove(self._clicked_item)
# avoid placement if colliding with other items
if not collision_items:
self._clicked_item.setPos(self._drop_indicator.scenePos())
self._clicked_item.data(
0).coordinate = self._drop_indicator.pos()
self._bounding_rect.update()
self.disable_drop_indicator()
self._clicked_item = None
else:
# connecting processes
if event.button() == Qt.LeftButton:
clicked_item = self.itemAt(event.scenePos(), QTransform())
self.execute_connection(clicked_item, event.scenePos())
super().mouseReleaseEvent(event)
def dragEnterEvent(self, event):
pass
def dragLeaveEvent(self, event):
self.disable_drop_indicator()
def dragMoveEvent(self, event):
if self.draft_mode & (self.edit_mode == SelectConnect.SELECT):
self.align_drop_indicator(event.scenePos())
def dropEvent(self, event):
"""add new process to list and process item to scene"""
# prevent process placement if item exists there
if len(self.collidingItems(self._drop_indicator)) > 0:
return
core_name = event.mimeData().data(
MimeType.PROCESS_CORE.value).data().decode('UTF-8')
process_core = list(
filter(lambda element: element.name == core_name, self._cores))[0]
# define name based on process core and existing names
remainder_name = [
process.name.split(process_core.name)[1].strip()
for process in self._model.process_list
if process_core.name in process.name
]
if not remainder_name:
process_name = process_core.name
elif max(remainder_name).isdigit():
process_name = process_core.name + " " + str(
int(max(remainder_name)) + 1)
else:
process_name = process_core.name + " 1"
# create new process based on process core and add to element list
process = Process(process_name, self._drop_indicator.pos(),
process_core)
self._model.add_process(process)
# create process item and connections
self.draw_process(process)
self.update_commodities()
self.disable_drop_indicator()
def contextMenuEvent(self, event):
"""context menu to interact with process items - delete item"""
# prevent context menu of scene not in draft mode
if not self.draft_mode:
return
if self._edit_mode == SelectConnect.SELECT:
# open context menu only for process items
self._clicked_item = self.itemAt(event.scenePos(), QTransform())
if self._clicked_item:
if isinstance(self._clicked_item, ProcessItem):
menu = QMenu()
delete_action = QAction("Delete", None)
delete_action.triggered.connect(
lambda: self.delete_process(self._clicked_item))
menu.addAction(delete_action)
menu.exec_(event.screenPos())
self._clicked_item = None
else:
# open context menu for commodities of other sections
menu = QMenu()
section_list = [
item for item in OverviewSelection if item is not self._section
and item is not OverviewSelection.OVERVIEW
]
for section in section_list:
submenu = QMenu(section.name)
section_coms = [
commodity for commodity in self._model.commodity_list
if section in commodity.connection_count.keys()
]
for commodity in section_coms:
action = submenu.addAction(str(commodity))
action.setData(commodity)
# only add sub menu if commodities are available
if section_coms:
menu.addMenu(submenu)
# execute menu
action = menu.exec_(QCursor.pos())
if action:
# start connection
line_pen = QPen(Qt.lightGray, 1, Qt.DashLine)
line = QLineF(event.scenePos(), event.scenePos())
self._connect_line = self.addLine(line, line_pen)
self._connect_line.setData(0, None)
self._connect_line.setData(1, action.data())
self.views()[1].setMouseTracking(True)
def setSceneRect(self, rect):
"""set sceneRect to view boundaries if necessary space is less"""
super().setSceneRect(
self._bounding_rect.scene_rect(rect, 2 * MIN_GRID_MARGIN))
