我是Python和pyqtgraph的新手.我正在为不同类型的信号工作.当我想在鼠标位置包含十字准线和文本标签时,我会陷入困境.我正在使用GridLayout,因为稍后该图表将与其他几个元素结合使用.
我尝试调整pyqtgraph示例十字线/鼠标交互但除了pyqtgraph中的许多其他东西我不明白vm = signalgraph.vb在mousemoved()之前的含义并且脚本引发了一个NameError
from pyqtgraph.Qt import QtGui, QtCore
import numpy as np
import pyqtgraph as pg
#QtGui.QApplication.setGraphicsSystem('raster')
app = QtGui.QApplication([])
mainwindow = QtGui.QMainWindow()
mainwindow.setWindowTitle('pyqtgraph example: PlotWidget')
mainwindow.resize(1000,800)
cw = QtGui.QWidget()
mainwindow.setCentralWidget(cw)
gridlayout = QtGui.QGridLayout()
cw.setLayout(gridlayout)
# define plot windows
signalgraph = pg.PlotWidget(name='Signalgraph')
# set position and size of plot windows
gridlayout.addWidget(signalgraph,0,0)
mainwindow.show()
# sample data
x = [0,1,2,3,4,5,6,7,8,9,10]
y = [0,0,0,8,8,8,9,9,9,0,0]
# plot 1
curve = pg.PlotCurveItem(x,y[:-1],pen='w',stepMode=True)
signalgraph.addItem(curve)
#cross hair in signalgraph
vLine = pg.InfiniteLine(angle=90, movable=False)
hLine = …