Basemap/PySide QWidget：将文本绘制到地图上

Question

我在写入文本到Basemap上时遇到了困难，该文件位于PySide QWidget的内部。从我在网上找到的，人做到以下几点：

import matplotlib.pyplot as plt 
... 
plt.text(x, y, 'some text') 

但是当我尝试类似的东西与我的代码，它的另一个窗口弹出与文本，而不是小部件中的地图上。

底图没有像text()这样的方法，所以我一直想不出做什么。任何人都有想法如何在这种情况下绘制文本到底图？

全码：

''' 
This program should draw a dot on a random point on Earth and label it 'Point' 
You'll probably attempt to do this on line 43 in changeMap() 
''' 

from PySide import QtCore, QtGui 

import matplotlib 
matplotlib.use('Qt4Agg') 
matplotlib.rcParams['backend.qt4']='PySide' 
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas 
from matplotlib.backends.backend_qt4agg import NavigationToolbar2QT as NavigationToolbar 
from matplotlib.figure import Figure 
from mpl_toolkits.basemap import Basemap 

from random import randint 

class MapWidget(QtGui.QWidget): 
    def __init__(self, parent=None): 
     super().__init__(parent) 
     self.figure = Figure() 
     self.canvas = FigureCanvas(self.figure) 
     self.layout = QtGui.QVBoxLayout(self) 
     self.mplToolbar = NavigationToolbar(self.canvas, self, coordinates=False) 
     self.layout.addWidget(self.canvas) 
     self.layout.addWidget(self.mplToolbar) 
     self.axes = self.figure.add_subplot(111) 
     self.setLayout(self.layout) 
     # Create our Basemap 
     self.map = Basemap(projection='robin', lon_0=0, ax=self.axes, resolution='c') 
     self.map.drawcoastlines() 
     self.map.drawcountries() 
     # Create empty plot to store random coordinates in for later 
     self.points, = self.map.plot([], [], 'o') 
     # Draw to screen 
     self.canvas.draw() 
     self.show() 

    def changeMap(self, lat, lon, text): 
     x, y = self.map(lon, lat) 
     self.points.set_data(x, y) 
     # Draw text here 

     self.canvas.draw() 


class Ui_MainWindow(object): 
    def plot(self): 
     # Plot on some random coordinate and label it 'Point' 
     self.Map.changeMap(randint(-90, 90), randint(-180, 180), 'Point') 

    def myChanges(self): 
     # Initialize our Basemap 
     self.Map = MapWidget() 
     self.layoutMap = QtGui.QVBoxLayout(self.widget) 
     self.layoutMap.addWidget(self.Map) 
     # Plot a new point when the button is clicked 
     self.pushButton.clicked.connect(self.plot) 

    # The following is all PySide code, not very relevant to the question 
    def setupUi(self, MainWindow): 
     MainWindow.setObjectName("MainWindow") 
     MainWindow.resize(800, 600) 
     self.centralwidget = QtGui.QWidget(MainWindow) 
     self.centralwidget.setObjectName("centralwidget") 
     self.horizontalLayout_2 = QtGui.QHBoxLayout(self.centralwidget) 
     self.horizontalLayout_2.setObjectName("horizontalLayout_2") 
     self.horizontalLayout = QtGui.QHBoxLayout() 
     self.horizontalLayout.setObjectName("horizontalLayout") 
     self.pushButton = QtGui.QPushButton(self.centralwidget) 
     self.pushButton.setMaximumSize(QtCore.QSize(100, 16777215)) 
     self.pushButton.setObjectName("pushButton") 
     self.horizontalLayout.addWidget(self.pushButton) 
     self.widget = QtGui.QWidget(self.centralwidget) 
     self.widget.setObjectName("widget") 
     self.horizontalLayout.addWidget(self.widget) 
     self.horizontalLayout_2.addLayout(self.horizontalLayout) 
     MainWindow.setCentralWidget(self.centralwidget) 
     self.menubar = QtGui.QMenuBar(MainWindow) 
     self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 21)) 
     self.menubar.setObjectName("menubar") 
     MainWindow.setMenuBar(self.menubar) 
     self.statusbar = QtGui.QStatusBar(MainWindow) 
     self.statusbar.setObjectName("statusbar") 
     MainWindow.setStatusBar(self.statusbar) 

     self.retranslateUi(MainWindow) 
     QtCore.QMetaObject.connectSlotsByName(MainWindow) 

     self.myChanges() 

    def retranslateUi(self, MainWindow): 
     MainWindow.setWindowTitle(QtGui.QApplication.translate("MainWindow", "MainWindow", None, QtGui.QApplication.UnicodeUTF8)) 
     self.pushButton.setText(QtGui.QApplication.translate("MainWindow", "Plot", None, QtGui.QApplication.UnicodeUTF8)) 


if __name__ == "__main__": 
    import sys 
    app = QtGui.QApplication(sys.argv) 
    MainWindow = QtGui.QMainWindow() 
    ui = Ui_MainWindow() 
    ui.setupUi(MainWindow) 
    MainWindow.show() 
    sys.exit(app.exec_()) 

Answer 1

要获得底图情节的文字，你会认为文本添加到轴。您已将这些文件存储在self.axes中。 在这里，您将创建一个空的文本

# Create empty plot to store random coordinates in for later 
self.points, = self.map.plot([], [], 'o') 
self.pointsannotate = self.axes.text(0,0,"", color="crimson") 

后来更新文本的位置和字符串：

def changeMap(self, lat, lon, text): 
    x, y = self.map(lon, lat) 
    self.points.set_data(x, y) 
    # Draw text here 
    self.pointsannotate.set_position([x,y]) 
    self.pointsannotate.set_text("{},{}".format(lon, lat)) 

    self.canvas.draw()