pyqt 实现多个有连接的节点绘制自动布局算法代码实现

PyQt是一个结合了Python和Qt库的应用程序开发工具包，用于创建跨平台的图形用户界面。在PyQt中，特别是使用QGraphicsScene和QGraphicsView组件，可以构建复杂的图形布局，包括节点和连线。以下是一个简单的例子，展示了如何使用自定义节点类(QGraphicsItem)并应用自动布局算法（如`QGraphicsLayout`）来组织节点：

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QPainter, QPen, QFontMetrics
from PyQt5.QtWidgets import QGraphicsScene, QGraphicsView, QGraphicsRectItem, QGraphicsLineItem
from PyQt5.QtChart import QGraphicsEllipseItem as Node

class MyNode(Node):
    def __init__(self, scene, text=""):
        super().__init__(scene)
        self.text = text
        self.setFlags(self.ItemIsMovable | self.ItemIsSelectable)

    def paint(self, painter, option, widget=None):
        painter.setPen(QPen(Qt.black, 2))
        painter.drawText(0, 0, self.text)
        # 其他自定义样式...

class AutoLayoutView(QGraphicsView):
    def resizeEvent(self, event):
        self.setSceneRect(event.rect())
        layout = QGraphicsGridLayout()
        layout.setHorizontalSpacing(10)
        layout.setVerticalSpacing(10)
        for i in range(4):  # 4行4列布局
            for j in range(4):
                node = MyNode(self.scene(), f"Node {i*4+j}")
                layout.addItem(node, i, j)
        self.setScene(layout)

class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
        scene = QGraphicsScene()
        view = AutoLayoutView(scene)
        self.setCentralWidget(view)
        self.resize(800, 600)

if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())