Point_24/graph_24.py

from PySide6.QtCore import Qt, QRectF, Signal, QObject
from PySide6.QtGui import QPainter, QPen, QColor, QFontMetricsF, QPainterPath
from PySide6.QtWidgets import QGraphicsItem


class RoundedRectangleItem(QGraphicsItem, QObject):
	selected = Signal(int)
	unselected = Signal(int)

	def __init__(self, x, y, text, id):
		QGraphicsItem.__init__(self)
		QObject.__init__(self)
		self.rect = QRectF(x, y, 70, 70)
		self.radius = 10
		self.text = text
		self.id = id
		self.isSelected = False  # 是否被选中

	def boundingRect(self):
		return self.rect

	def shape(self):
		path = QPainterPath()
		path.addRoundedRect(self.rect, self.radius, self.radius)
		return path

	def paint(self, painter, option, widget):
		painter.setRenderHint(QPainter.Antialiasing)  # 设置抗锯齿
		pen = QPen(Qt.black)
		painter.setPen(pen)

		if self.isSelected:
			# 如果被选中，设置不同的填充颜色和边框样式
			painter.setBrush(QColor(255, 0, 0, 255))  # 设置选中时的填充颜色
			pen.setWidth(2)  # 设置边框宽度
			pen.setStyle(Qt.DashLine)  # 设置虚线边框样式
			painter.setPen(pen)
		else:
			painter.setBrush(QColor(0, 255, 0, 255))  # 设置默认的填充颜色

		# 绘制圆角矩形
		painter.drawRoundedRect(self.rect, self.radius, self.radius)

		# 计算文本的位置
		font = painter.font()
		font.setPointSize(36)
		painter.setFont(font)
		metrics = QFontMetricsF(font)
		text_bounding_rect = metrics.boundingRect(str(self.text))
		text_width = text_bounding_rect.width()
		text_height = text_bounding_rect.height()
		text_x = self.rect.center().x() - text_width / 2
		text_y = self.rect.center().y() + text_height / 4

		# 绘制文本
		painter.drawText(text_x, text_y, str(self.text))

	def mousePressEvent(self, event):
		# 鼠标点击时切换选中状态
		self.isSelected = not self.isSelected
		self.update()

		# 发射选中信号
		if self.isSelected:
			self.selected.emit(self.id)
		else:
			self.unselected.emit(self.id)

		super().mousePressEvent(event)