用python写一个GIS界面，界面有一个按钮，点击按钮可以选择本地dwg和shp文件进行显示

这是一个基于PyQt5的简单示例，可以实现你所描述的功能：

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QFileDialog
from PyQt5.QtGui import QPixmap
import ezdxf
import shapefile


class GISViewer(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setGeometry(100, 100, 800, 600)
        self.setWindowTitle('GIS Viewer')

        # 创建按钮
        self.btn = QPushButton('选择文件', self)
        self.btn.move(20, 20)
        self.btn.clicked.connect(self.selectFile)

        # 创建用于显示DWG和SHP文件的标签
        self.dwgLabel = QLabel(self)
        self.dwgLabel.setGeometry(20, 60, 380, 520)
        self.shpLabel = QLabel(self)
        self.shpLabel.setGeometry(400, 60, 380, 520)

        self.show()

    def selectFile(self):
        # 打开文件选择对话框
        fileNames, _ = QFileDialog.getOpenFileNames(self, '选择文件', '', 'DWG Files (*.dwg);;SHP Files (*.shp)')

        # 加载DWG和SHP文件到标签中
        for fileName in fileNames:
            if fileName.endswith('.dwg'):
                self.loadDwg(fileName)
            elif fileName.endswith('.shp'):
                self.loadShp(fileName)

    def loadDwg(self, fileName):
        # 使用ezdxf库加载DWG文件
        doc = ezdxf.readfile(fileName)
        modelspace = doc.modelspace()
        msp = list(modelspace)
        if msp:
            # 将DWG文件转换为QPixmap并显示在标签上
            pix = QPixmap.fromImage(msp[0].render(qt_mode=True))
            self.dwgLabel.setPixmap(pix)

    def loadShp(self, fileName):
        # 使用shapefile库加载SHP文件
        sf = shapefile.Reader(fileName)
        shapes = sf.shapes()
        if shapes:
            # 创建一个空的QImage，大小与标签相同
            img = QImage(self.shpLabel.width(), self.shpLabel.height(), QImage.Format_RGB32)
            img.fill(Qt.white)
            painter = QPainter(img)

            # 遍历所有形状并绘制
            for shape in shapes:
                points = shape.points
                if shape.shapeType == shapefile.POLYGON:
                    # 绘制多边形
                    polygon = QPolygonF([QPointF(x, y) for x, y in points])
                    painter.drawPolygon(polygon)
                elif shape.shapeType == shapefile.POLYLINE:
                    # 绘制折线
                    polyline = QPolygonF([QPointF(x, y) for x, y in points])
                    painter.drawPolyline(polyline)

            painter.end()

            # 将QImage转换为QPixmap并显示在标签上
            pix = QPixmap.fromImage(img)
            self.shpLabel.setPixmap(pix)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = GISViewer()
    sys.exit(app.exec_())

这个界面中有一个“选择文件”按钮，点击后可以选择DWG和SHP文件。选择的文件将显示在左侧和右侧的标签中。DWG文件使用ezdxf库加载并显示，SHP文件使用shapefile库加载并绘制在QImage上，然后将QImage转换为QPixmap并显示。