我正在尝试创建一个在 matplotlib 底图上绘制随机点的按钮。唯一的问题是我希望删除以前绘制的点(即在给定时间地图上应该只有一个点。)
我想我在初始化一个空的底图之后,我可以将它保存到一个变量(newMap = self.map
)中,所以当我想绘制一个新点时,我可以使用newMap
(ie newMap.plot(x, y, 'o')
)来绘制。据我所知,更改仍然存在于原始 basemapself.map
中。
有人知道如何“清除”底图,以便以前绘制的点不会持续存在吗?
完整代码:
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()
self.canvas.draw()
self.show()
def changeMap(self, lat, lon):
# I'm saving the supposedly 'clean' Basemap to a variable and plotting on that
newMap = self.map
x, y = newMap(lon, lat)
newMap.plot(x, y, 'o')
self.canvas.draw()
class Ui_MainWindow(object):
def plot(self):
# Plot on some random coordinate
self.Map.changeMap(randint(-90, 90), randint(-180, 180))
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_())