我正在尝试在鼠标移动到图形上方时获取随机函数图的(x,y)值。我使用了pyqtgraph.SignalProxy并将其连接到回调函数mouseMoved。
但是我收到了这个错误:
“NameError:全局名称'mouseMoved'未定义”
以下是代码:
有什么我做错的地方吗?
谢谢。
import sys
from pyqtgraph.Qt import QtGui, QtCore
import numpy as np
import pyqtgraph as pg
import time
import random
class TestClass(QtGui.QMainWindow):
#####################################################
def __init__(self):
super(TestClass, self).__init__()
self.initUI()
#####################################################
# GUI construction
def initUI(self):
win = pg.GraphicsWindow(title="Mouse Point, x & y")
# creates plot
self.plot = pg.PlotWidget()
self.plot.setLabel('left', "B", units='T')
self.plot.setLabel('bottom', "t", units='s')
self.plot.showGrid(x=1, y=1, alpha=None)
self.setCentralWidget(win)
self.setGeometry(600, 600, 600, 600)
self.setWindowTitle('Mouse Point, x& y GUI')
# Create some widgets to be placed inside
btnRandon = QtGui.QPushButton('Random Function')
# Create a grid layout to manage the widgets size and position
layout = QtGui.QGridLayout()
win.setLayout(layout)
# Add widgets to the layout in their proper positions
layout.addWidget(btnRandon, 0, 0) # button to show or hide the OldB
layout.addWidget(self.plot, 1, 0)
mypen = pg.mkPen('y', width=1)
self.curve = self.plot.plot(pen=mypen)
# Plot
self.t_plot_max = 30
self.fe = 10e3
self.t = np.arange(-1 * self.t_plot_max, 0, 1.0 / self.fe)
self.len_signal = len(self.t)
self.signal = np.zeros(self.len_signal, dtype=np.double)
# status bar
self.statusBar()
# clicked button evt
btnRandon.clicked.connect(self.buttonRandomClicked)
# show graph
self.show()
#####################################################
def mouseMoved(evt):
mousePoint = self.curve.vb.mapSceneToView(evt[0])
label.setText("<span style='font-size: 14pt; color: white'> x = %0.2f, <span style='color: white'> y = %0.2f</span>" % (mousePoint.x(), mousePoint.y()))
#####################################################
def buttonRandomClicked(self):
print ("Show/Hide OldB")
self.signal = np.random.rand(20)
self.curve.setData(self.signal)
#####################################################
def update(self):
proxy = pg.SignalProxy(self.curve.scene().sigMouseMoved, rateLimit=60, slot=mouseMoved)
self.statusBar().showMessage('Update timer event')
# MAIN ##################################################
def main():
app = QtGui.QApplication(sys.argv)
ex = TestClass()
timer = QtCore.QTimer()
timer.timeout.connect(ex.update)
timer.start(200)
sys.exit(app.exec_())
if __name__ == '__main__':
main()
有什么我做错的地方吗?
谢谢。