python - How can I use or return the coordinates of pyqtgraph, after clicking, outside the mousePressed function?

Question

I want to access the coordinates outside the mousePress function. What I want is:

call self.curve.scene().sigMouseClicked.connect(self.mousePress) when PushButton is pressed. But I am unable to return the values from mousePress function.

import sys
import platform
from PySide2.QtWidgets import QApplication, QWidget, QPushButton
from PySide2 import QtCore, QtGui, QtWidgets
from PySide2.QtCore import (QCoreApplication, QPropertyAnimation, QDate, QDateTime, QMetaObject,
    QObject, QPoint, QRect, QSize, QTime, QUrl, Qt, QEvent)
from PySide2.QtGui import (QBrush, QColor, QConicalGradient, QCursor, QFont,
    QFontDatabase, QIcon, QKeySequence, QLinearGradient, QPalette, QPainter,
    QPixmap, QRadialGradient)
from PySide2.QtWidgets import *
from PySide2.QtGui import QPainter, QBrush, QPen, QPainterPath
import numpy as np
import math
from PySide2 import QtWidgets
from pyqtgraph.Qt import QtGui, QtCore
from pyqtgraph import PlotWidget, plot
import pyqtgraph as pg

import os


#import serial
import time

#ser = serial.Serial('COM5', 9600)
class MainWindow(QtWidgets.QMainWindow):

    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)

        self.graphWidget = pg.PlotWidget()
        self.setCentralWidget(self.graphWidget)
        

        self.button = QPushButton('Run', self)
        self.button.setToolTip('Click to run.')
        self.button.move(100,70)

        hour = []
        temperature = []

        

        x_for_line = [0, 0]
        y_for_line = [0, 10]
        x=0
        
        
        r = 10
        
        theta = 0
        while (theta <= 180):
            hour.append(  r* math.sin(math.radians(theta)))
            temperature.append(r * math.sin(math.radians(90-theta)))
            theta = theta + 0.1
        
        #Add grid
        self.graphWidget.showGrid(x=True, y=True)
        self.graphWidget.setBackground('w')

        pen = pg.mkPen(color=(94, 186, 95), width=8)

        pen2 = pg.mkPen(color=(13, 31, 45), width=2)
        

        self.graphWidget.plot(x_for_line, y_for_line, pen=pen2)

        

        self.graphWidget.plot(temperature, hour, pen=pen)
        
    
        self.curve = self.graphWidget.plot(x_for_line,y_for_line , pen=pen)

        self.curve.scene().sigMouseMoved.connect(self.onMouseMoved)

        #if(btn_pressed):
        self.curve.scene().sigMouseClicked.connect(self.mousePress)

        
        # if(self.button.clicked.connect(self.on_click())):
        #     self.curve.scene().sigMouseClicked.connect(self.mousePress)
        #     k=0

    # def on_click(self):
    #     return True

    def onMouseMoved(self, point):
        p = self.graphWidget.plotItem.vb.mapSceneToView(point)
        self.statusBar().showMessage("{}-{}".format(p.x(), p.y()))
        
    def mousePress(self, event):
        global p_list
        p_list = []
        items = self.graphWidget.scene().items(event._scenePos)
        mousePoint = self.graphWidget.plotItem.vb.mapSceneToView(event._scenePos)
        self.graphWidget.clear()
        # print((mousePoint.x()),(mousePoint.y()))
        p_list = [mousePoint.x(), mousePoint.y()]
        return p_list
        

def main():
    app = QtWidgets.QApplication(sys.argv)
    main = MainWindow()
    main.show()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()

question from:https://stackoverflow.com/questions/65867595/how-can-i-use-or-return-the-coordinates-of-pyqtgraph-after-clicking-outside-th

Answer 1

Waitting for answers