我是Python和pyqtgraph的新手。我正在研究一种不同类型信号的查看器。当我想要包含一个十字线和一个带有鼠标位置的文本标签时，我被卡住了。我正在使用GridLayout，因为稍后图形将与其他几个元素组合在一起。
我试图调整pyqtgraph示例十字线/鼠标交互，但除了pyqtgraph中的许多其他内容外，我不理解mousemoved()之前的vb=signalgraph.vb的含义，并且脚本会引发一个NameErrorfrom 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
当做
迈克尔
