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"""PySide2 port of the Nested Donuts example from Qt v5.x"""

import sys

from PySide2.QtCore import Qt, QTimer
from PySide2.QtGui import QPainter
from PySide2.QtWidgets import QApplication, QGridLayout, QWidget
from PySide2.QtCharts import QtCharts

from random import randrange
from functools import partial

class Widget(QWidget):
    def __init__(self):
        QWidget.__init__(self)
        self.setMinimumSize(800, 600)
        self.donuts = []
        self.chart_view = QtCharts.QChartView()
        self.chart_view.setRenderHint(QPainter.Antialiasing)
        self.chart = self.chart_view.chart()
        self.chart.legend().setVisible(False)
        self.chart.setTitle("Nested donuts demo")
        self.chart.setAnimationOptions(QtCharts.QChart.AllAnimations)

        self.min_size = 0.1
        self.max_size = 0.9
        self.donut_count = 5

        self.setup_donuts()

        # create main layout
        self.main_layout = QGridLayout(self)
        self.main_layout.addWidget(self.chart_view, 1, 1)
        self.setLayout(self.main_layout)

        self.update_timer = QTimer(self)
        self.update_timer.timeout.connect(self.update_rotation)
        self.update_timer.start(1250)

    def setup_donuts(self):
        for i in range(self.donut_count):
            donut = QtCharts.QPieSeries()
            slccount = randrange(3, 6)
            for j in range(slccount):
                value = randrange(100, 200)

                slc = QtCharts.QPieSlice(str(value), value)
                slc.setLabelVisible(True)
                slc.setLabelColor(Qt.white)
                slc.setLabelPosition(QtCharts.QPieSlice.LabelInsideTangential)

                # Connection using an extra parameter for the slot
                slc.hovered[bool].connect(partial(self.explode_slice, slc=slc))

                donut.append(slc)
                size = (self.max_size - self.min_size)/self.donut_count
                donut.setHoleSize(self.min_size + i * size)
                donut.setPieSize(self.min_size + (i + 1) * size)

            self.donuts.append(donut)
            self.chart_view.chart().addSeries(donut)



    def update_rotation(self):
        for donut in self.donuts:
            phase_shift =  randrange(-50, 100)
            donut.setPieStartAngle(donut.pieStartAngle() + phase_shift)
            donut.setPieEndAngle(donut.pieEndAngle() + phase_shift)

    def explode_slice(self, exploded, slc):
        if exploded:
            self.update_timer.stop()
            slice_startangle = slc.startAngle()
            slice_endangle = slc.startAngle() + slc.angleSpan()

            donut = slc.series()
            idx = self.donuts.index(donut)
            for i in range(idx + 1, len(self.donuts)):
                self.donuts[i].setPieStartAngle(slice_endangle)
                self.donuts[i].setPieEndAngle(360 + slice_startangle)
        else:
            for donut in self.donuts:
                donut.setPieStartAngle(0)
                donut.setPieEndAngle(360)

            self.update_timer.start()

        slc.setExploded(exploded)

if __name__ == "__main__":
    app = QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec_())
