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from typing import Optional
from qtpy.QtWidgets import QGraphicsItem, QGraphicsPathItem
from qtpy.QtGui import QPainterPath, QPen
from qtpy.QtCore import Qt, QPointF
# B-ASIC
from b_asic.signal import Signal
from b_asic.scheduler_gui.graphics_component_item import GraphicsComponentItem
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class GraphicsSignal(QGraphicsPathItem):
_path: Optional[QPainterPath] = None
_src_operation: GraphicsComponentItem
_dest_operation: GraphicsComponentItem
_signal: Signal
def __init__(self,
src_operation: GraphicsComponentItem,
dest_operation: GraphicsComponentItem,
signal: Signal, pen: Optional[QPen] = None,
parent: Optional[QGraphicsItem] = None):
super().__init__(parent=parent)
self._src_operation = src_operation
self._dest_operation = dest_operation
self._signal = signal
if pen is None:
pen = QPen(Qt.black)
pen.setWidthF(0.03)
self.setPen(pen)
self.update_path()
def update_path(self):
"""
Create a new path after moving connected operations.
"""
source_point = self._src_operation.get_port_location(
f"out{self._signal.source.index}")
dest_point = self._dest_operation.get_port_location(
f"in{self._signal.destination.index}")
path = QPainterPath()
path.moveTo(source_point)
source_x = source_point.x()
source_y = source_point.y()
dest_x = dest_point.x()
dest_y = dest_point.y()
if abs(source_x - dest_x) <= 0.1:
ctrl_point1 = QPointF(source_x + 0.5, source_y)
ctrl_point2 = QPointF(source_x - 0.5, dest_y)
else:
mid_x = (source_x + dest_x)/2
ctrl_point1 = QPointF(mid_x, source_y)
ctrl_point2 = QPointF(mid_x, dest_y)
path.cubicTo(ctrl_point1, ctrl_point2, dest_point)
self.setPath(path)