Ytukyg

I'm very new to python and PyQT and have become stuck. So apologies if my code is a bit of a mess. I have spent quite some time searching but haven't yet found anything that helps my situation.

I'm trying to identify which ellipse was clicked.

I basically have a section that creates ellipses in a circle and prints text over it based on values from an array of lists:

class MyFrame(QtWidgets.QGraphicsView):

    def __init__(self, parent = None ):

        super(MyFrame, self).__init__(parent)



        self.setScene(QtWidgets.QGraphicsScene())

        self.setBackgroundBrush(QtGui.QColor(QtCore.Qt.darkGray))

        self.setRenderHints(self.renderHints() | QtGui.QPainter.Antialiasing  | QtGui.QPainter.SmoothPixmapTransform)



        arLights = list( {} for i in xrange(12) )

        circX = 0

        circY = 0

        maxX = 0

        maxY = 0

        i = 0

        pen = QtGui.QPen(QtGui.QColor(QtCore.Qt.lightGray).darker(50))

        brush = QtGui.QBrush(QtGui.QColor(QtCore.Qt.lightGray))

        font = QtGui.QFont('White Rabbit')

        font.setPointSize(12)



        arLights = getLights()



        theta = radians(360)

        columns = len(filter(None, arLights))

        alpha = theta / columns



        for a in range(columns):

            angle = a * alpha

            circX = (w + x) * cos(angle)

            circY = (h + y) * sin(angle)



            item = callbackEllipse(circX, circY, w, h) #(x+xi*(w+x), y+yi*(h+y), w, h)

            item.setAcceptHoverEvents(True)

            item.setPen(pen)

            item.setBrush(brush)

            self.scene().addItem(item)

            item.setFlag(QtWidgets.QGraphicsItem.ItemIsMovable)

            self.writeText(arrLight[i]['name'], circX + (w / 4), circY + (h * 0.75))

            i = i + 1

This is my mouseReleaseEvent, where I am then trying to work out the name associated with that ellipse by using the same formula that I used to lay them out.

class callbackEllipse(QtWidgets.QGraphicsEllipseItem):

    def mouseReleaseEvent(self, event):

        # recolor on click

        color = QtGui.QColor(QtCore.Qt.lightGray)

        brush = QtGui.QBrush(color)

        QtWidgets.QGraphicsEllipseItem.setBrush(self, brush)



        theta = radians(360)

        alpha = theta / arrRange



        arrLights = getLights()

        for a in xrange(0, len(filter(None, arrLights))):

            if (event.scenePos().x() > ((w + x) * cos(a * alpha))

                and event.scenePos().x() < (((w + x) * cos(a * alpha)) + w)

                and event.screenPos().y() < ((h + y) * sin(a * alpha))

                and event.screenPos().y() < (((h + y) * sin(a * alpha)) + h)

                ):

                print(arrLights[a]['name'])

                break



        return QtWidgets.QGraphicsEllipseItem.mouseReleaseEvent(self, event)

This doesn't work as intended. I've tried .sceenPos() .screenPos() and .pos() but they don't appear to match up with the co-ordinates from when I created the ellipses, resulting in it identifying the wrong associated text or not finding a match at all.

Can anyone help me with a way to identify the ellipse or what why my code isn't working the way I want it to? There doesn't seem to be a way to 'name' them, which would be easier.

Do not work 2 times unnecessarily, save a value reference and print it since mouseReleaseEvent() will only be called if the item is pressed:

import math

from PyQt5 import QtCore, QtGui, QtWidgets



def getLights():

    return [{"name": str(i)} for i in range(10)]



class CallbackEllipse(QtWidgets.QGraphicsEllipseItem):

    def __init__(self, light, *args, **kwargs):

        super(CallbackEllipse, self).__init__(*args, **kwargs)

        self._light = light



    def mouseReleaseEvent(self, event):

        color = QtGui.QColor(QtCore.Qt.lightGray)

        brush = QtGui.QBrush(color)

        self.setBrush(brush)    

        print(self._light["name"])

        super(CallbackEllipse, self).mouseReleaseEvent(event)



class MyFrame(QtWidgets.QGraphicsView):

    def __init__(self, parent=None):

        super(MyFrame, self).__init__(parent)



        self.setScene(QtWidgets.QGraphicsScene(self))

        self.setBackgroundBrush(QtGui.QColor(QtCore.Qt.darkGray))

        self.setRenderHints(self.renderHints() | QtGui.QPainter.Antialiasing  | QtGui.QPainter.SmoothPixmapTransform)



        arLights = getLights()



        theta = math.radians(360)

        filter_lights = list(filter(None, arLights)) 

        num_of_columns = len(filter_lights)

        delta = theta/num_of_columns

        circX, circY = 0, 0

        w, h, x, y = 100, 100, 100, 100



        pen = QtGui.QPen(QtGui.QColor(QtCore.Qt.lightGray).darker(50))

        brush = QtGui.QBrush(QtGui.QColor(QtCore.Qt.lightGray))



        for i, light in enumerate(filter_lights):

            angle = i*delta

            circX = (w + x) * math.cos(angle)

            circY = (h + y) * math.sin(angle)

            item = CallbackEllipse(light, circX, circY, w, h)

            item.setAcceptHoverEvents(True)

            item.setPen(pen)

            item.setBrush(brush)

            item.setFlag(QtWidgets.QGraphicsItem.ItemIsMovable)

            self.scene().addItem(item)



if __name__ == '__main__':

    import sys

    app = QtWidgets.QApplication(sys.argv)

    w = MyFrame()

    w.show()

    sys.exit(app.exec_())