我是Python和pyqtgraph的新手。我正在为不同类型的信号查看器。当然，当我想用鼠标位置包含十字准线和文本标签时，我陷入了困境。我正在使用GridLayout，因为后来该图与其他几个元素结合在一起。如何绘制十字线并在pyqtgraph中绘制鼠标位置？
我试图适应pyqtgraph例如十字/鼠标交互，但除了在pyqtgraph许多其他的事情我不明白的意义VB = signalgraph.vb之前的mouseMoved()，它的剧本提出了一个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 = pg.InfiniteLine(angle=0, movable=False)
signalgraph.addItem(vLine, ignoreBounds=True)
signalgraph.addItem(hLine, ignoreBounds=True)
# Here I am not sure what to do ...
vb = signalgraph.vb
##vb = pg.ViewBox()
def mouseMoved(evt):
pos = evt[0]
if signalgraph.sceneBoundingRect().contains(pos):
mousePoint = vb.mapSceneToView(pos)
index = int(mousePoint.x())
if index > 0 and index < len(x):
label.setText("x=%0.1f, y1=%0.1f" % (mousePoint.x(), y[index], data2[index]))
vLine.setPos(mousePoint.x())
hLine.setPos(mousePoint.y())
proxy = pg.SignalProxy(signalgraph.scene().sigMouseMoved, rateLimit=60, slot=mouseMoved)
signalgraph.scene().sigMouseMoved.connect(mouseMoved)
# Start Qt event loop unless running in interactive mode or using pyside.
if __name__ == '__main__':
import sys
if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
QtGui.QApplication.instance().exec_()
非常感谢 问候 迈克尔
-07-22
Michael
