如何在 pyqtgraph 小部件上获取鼠标光标坐标？

Question

我想在 pyqtgraph 小部件上获取鼠标光标坐标，并将它们发送到一个函数，每当我双击该小部件时。我查找了如何找到一些类似的问题，但我仍然无法获得正确的坐标。

import pyqtgraph as pg
from pyqtgraph.Qt import QtGui, QtCore
from pyqtgraph.dockarea import *
from PyQt5.QtGui import *
from PyQt5.QAxContainer import *
from PyQt5.QtCore import *

def on_double_click_out(event):
    pos = event
    print('clicked', pos)
        
class Plotter():
    def __init__(self):
        pg.setConfigOption('background', 'w')
        pg.setConfigOption('foreground', 'k')

        self.win = QtGui.QMainWindow()
        self.area = DockArea()
        self.win.setCentralWidget(self.area)
        self.win.resize(1000,500)
        self.win.setWindowTitle('pyqtgraph example: dockarea')
 
        self.dock_TR = Dock("TR", size=(300,10))  
        self.dock_TR.hideTitleBar()
        
        self.area.addDock(self.dock_TR) 
        
        self.widgetTR = pg.PlotWidget()
        self.widgetTR.showGrid(x=True, y=True, alpha=0.3)   
        self.dock_TR.addWidget(self.widgetTR)        
        self.win.show()        
            
p = Plotter()
proxy = pg.SignalProxy(p.widgetTR.scene().sigMouseClicked, rateLimit=60, slot=on_double_click_out)

当我点击（不是双击）widgetTR 时，我得到了一些坐标，但它们与 x、y 轴无关。例如，当我点击小部件的 (1, 1) 时，结果是 clicked (<MouseClickEvent (573,-259) button=1>,) 我也想知道我是否可以通过双击来做到这一点。

Answer 1

您可以使用 pyqtgraph.GraphicsScene.mouseEvents.MouseClickEvent.double() 查看 MouseClickEvent 是否为双击。

您确定坐标不正确吗？坐标系从左上角的(0,0)开始。

试试这个代码，它对我有用：

import pyqtgraph as pg
from pyqtgraph.Qt import QtGui, QtCore
from pyqtgraph.dockarea import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5 import QtCore, QtGui, QtWidgets, uic
import numpy as np

def on_double_click_out(event):
    mouseEvent = event[0]
    mousePoint = mouseEvent.pos()
    if mouseEvent.double():
        print("Double click")
    if p.p1.sceneBoundingRect().contains(mousePoint):        
        print('x=', mousePoint.x(), ' y=', mousePoint.y())
        
class Plotter():
    def __init__(self):
        pg.setConfigOption('background', 'w')
        pg.setConfigOption('foreground', 'k')

        self.win = pg.GraphicsLayoutWidget(show=True)
        self.win.resize(1000,500)
        self.win.setWindowTitle('pyqtgraph example: dockarea')
 
        self.p1 = self.win.addPlot()
        self.win.show()        
            
p = Plotter()
proxy = pg.SignalProxy(p.win.scene().sigMouseClicked, rateLimit=60, slot=on_double_click_out)

if __name__ == '__main__':
    import sys
    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
        QtGui.QApplication.instance().exec_()

您还可以查看 pyqtgraph 示例“crosshair.py”。

如何在 pyqtgraph 小部件上获取鼠标光标坐标？

How to get mouse cursor coordinates on a pyqtgraph widget?

python

pyqtgraph