
#############################################################################
##
## Copyright (C) 2010 Hans-Peter Jansen <hpj@urpla.net>
## Copyright (C) 2011 Arun Srinivasan <rulfzid@gmail.com>
## Copyright (C) 2016 The Qt Company Ltd.
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##
## This file is part of the Qt for Python examples of the Qt Toolkit.
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##   * Redistributions in binary form must reproduce the above copyright
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##     the documentation and/or other materials provided with the
##     distribution.
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from math import (cos, sin, pi)

from PySide2.QtGui import (QPainter, QPolygonF)
from PySide2.QtCore import (QPointF, QSize, Qt)

PAINTING_SCALE_FACTOR = 20


class StarRating(object):
    """ Handle the actual painting of the stars themselves. """

    def __init__(self, starCount=1, maxStarCount=5):
        self.starCount = starCount
        self.maxStarCount = maxStarCount

        # Create the star shape we'll be drawing.
        self.starPolygon = QPolygonF()
        self.starPolygon.append(QPointF(1.0, 0.5))
        for i in range(1, 5):
            self.starPolygon.append(QPointF(0.5 + 0.5 * cos(0.8 * i * pi),
                                    0.5 + 0.5 * sin(0.8 * i * pi)))

        # Create the diamond shape we'll show in the editor
        self.diamondPolygon = QPolygonF()
        diamondPoints = [QPointF(0.4, 0.5), QPointF(0.5, 0.4),
                         QPointF(0.6, 0.5), QPointF(0.5, 0.6),
                         QPointF(0.4, 0.5)]
        for point in diamondPoints:
            self.diamondPolygon.append(point)

    def sizeHint(self):
        """ Tell the caller how big we are. """
        return PAINTING_SCALE_FACTOR * QSize(self.maxStarCount, 1)

    def paint(self, painter, rect, palette, isEditable=False):
        """ Paint the stars (and/or diamonds if we're in editing mode). """
        painter.save()

        painter.setRenderHint(QPainter.Antialiasing, True)
        painter.setPen(Qt.NoPen)

        if isEditable:
            painter.setBrush(palette.highlight())
        else:
            painter.setBrush(palette.windowText())

        yOffset = (rect.height() - PAINTING_SCALE_FACTOR) / 2
        painter.translate(rect.x(), rect.y() + yOffset)
        painter.scale(PAINTING_SCALE_FACTOR, PAINTING_SCALE_FACTOR)

        for i in range(self.maxStarCount):
            if i < self.starCount:
                painter.drawPolygon(self.starPolygon, Qt.WindingFill)
            elif isEditable:
                painter.drawPolygon(self.diamondPolygon, Qt.WindingFill)
            painter.translate(1.0, 0.0)

        painter.restore()
