用pyqt写一个地图可放大缩小的代码

好的，以下是一个使用 PyQt 创建地图可放大缩小的代码示例：

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QGraphicsView, QGraphicsScene
from PyQt5.QtGui import QPixmap

app = QApplication(sys.argv)
window = QMainWindow()

# 载入地图图片
map_image = QPixmap("map.png")

# 创建 QGraphicsScene 对象
scene = QGraphicsScene()
scene.addPixmap(map_image)

# 创建 QGraphicsView 对象并关联场景
view = QGraphicsView(scene)
view.setRenderHint(QPainter.Antialiasing)
view.setDragMode(QGraphicsView.ScrollHandDrag)
view.setViewportUpdateMode(QGraphicsView.FullViewportUpdate)
view.setOptimizationFlag(QGraphicsView.DontAdjustForAntialiasing, True)
view.setOptimizationFlag(QGraphicsView.DontSavePainterState, True)
view.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
view.setHorizontalScrollBarPolicy(Qt.ScrollBarAlways