PlotCurveItem

[Wahabo Ouedraogo]

Hi everyone!

I created a class Plot_Curve_Item that herite of the PlotCurveItem class of pyqtgraph. In the manufacturer of the class, I declare a timer which is a QTimeLine instance of Qt. I redefine the HoverEvent method to increase the thickness of the curve when the mouse flies over it for a time of 1000ms. so I call the start function of QTimerLine to start the timer. I connect the finished signal of the timer to the Timer slot that I defined in the class Plot_Curve_Item to draw the width of the curve to 2 once the time of 1000 ms is elapsed. However, when I execute the code, python sends me this message:

 Error sending hover exit event:

    |==============================>>

    |  Traceback (most recent call last):

    |    File "d:/Documents/VISUAL STUDIO CODE EXO/PlotCurve.py", line 39, in <module>

    |      sys.exit(app.exec_())

    |    File "C:\Users\ThinkPad\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pyqtgraph\widgets\GraphicsView.py", line 368, in mouseMoveEvent

    |      QtGui.QGraphicsView.mouseMoveEvent(self, ev)

    |    File "C:\Users\ThinkPad\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pyqtgraph\GraphicsScene\GraphicsScene.py", line 162, in mouseMoveEvent

    |      self.sendHoverEvents(ev)

    |    File "C:\Users\ThinkPad\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pyqtgraph\GraphicsScene\GraphicsScene.py", line 256, in sendHoverEvents

    |      debug.printExc("Error sending hover exit event:")

    |    --- exception caught here ---

    |    File "C:\Users\ThinkPad\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pyqtgraph\GraphicsScene\GraphicsScene.py", line 254, in sendHoverEvents

    |      item.hoverEvent(event)

    |    File "d:/Documents/VISUAL STUDIO CODE EXO/PlotCurve.py", line 20, in hoverEvent

    |      self.timer.start()

    |  AttributeError: 'Plot_Curve_Item' object has no attribute 'timer'

    |==============================<<

Here's the whole code:

from PyQt5.QtCore import *

from PyQt5.QtGui import *

from PyQt5.QtWidgets import *

import pyqtgraph as pg

from pyqtgraph.Qt import QtGui, QtCore

import numpy as np

import time

import sys

class Plot_Curve_Item(pg.PlotCurveItem):

    def __init(self,parent = None):

        super().__init__(parent=parent)

        self.setParent(parent)

        self.timer = QTimeLine(1000)

        self.timer.finished.connect(self.Timer)

    def hoverEvent(self,event):

        self.timer.start()

        self.setPen(width=4)

    

    def Timer(self):

        self.setPen(width=2)

if __name__ == "__main__":

    app = QApplication(sys.argv)

    widget = QMainWindow()

    x1 = np.linspace(0,20,10)

    y1 =  np.arange(0,10)

    Plot_Widget = pg.PlotWidget()

    Plot_Item = pg.PlotItem()

    plot_item_curve = Plot_Curve_Item(x1,y1)

    Plot_Item.addItem(plot_item_curve)

    Plot_Widget.addItem(Plot_Item)

    widget.setCentralWidget(Plot_Widget)

    widget.show()

    sys.exit(app.exec_())

[Patrick]

Hi,

This looks like it should work, until you see your "__init()" method should be "__init__()"!

Patrick

[vas...@gmail.com]

class Plot_Curve_Item(pg.PlotCurveItem):
    def __init__(self, parent=None):
        super(Plot_Curve_Item, self).__init__(parent=parent)

--
You received this message because you are subscribed to the Google Groups "pyqtgraph" group.
To unsubscribe from this group and stop receiving emails from it, send an email to pyqtgraph+...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/pyqtgraph/367c1701-7e38-4011-bcb4-0d58a57d72bc%40googlegroups.com.