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++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include "starrating.h"
++
++ #include <QtWidgets>
++ #include <cmath>
++
++ constexpr int PaintingScaleFactor = 20;
++
++ //! [0]
++ StarRating::StarRating(int starCount, int maxStarCount)
++ : myStarCount(starCount),
++ myMaxStarCount(maxStarCount)
++ {
++ starPolygon << QPointF(1.0, 0.5);
++ for (int i = 1; i < 5; ++i)
++ starPolygon << QPointF(0.5 + 0.5 * std::cos(0.8 * i * 3.14),
++ 0.5 + 0.5 * std::sin(0.8 * i * 3.14));
++
++ diamondPolygon << 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);
++ }
++ //! [0]
++
++ //! [1]
++ QSize StarRating::sizeHint() const
++ {
++ return PaintingScaleFactor * QSize(myMaxStarCount, 1);
++ }
++ //! [1]
++
++ //! [2]
++ void StarRating::paint(QPainter *painter, const QRect &rect,
++ const QPalette &palette, EditMode mode) const
++ {
++ painter->save();
++
++ painter->setRenderHint(QPainter::Antialiasing, true);
++ painter->setPen(Qt::NoPen);
++ painter->setBrush(mode == EditMode::Editable ?
++ palette.highlight() :
++ palette.windowText());
++
++ const int yOffset = (rect.height() - PaintingScaleFactor) / 2;
++ painter->translate(rect.x(), rect.y() + yOffset);
++ painter->scale(PaintingScaleFactor, PaintingScaleFactor);
++
++ for (int i = 0; i < myMaxStarCount; ++i) {
++ if (i < myStarCount)
++ painter->drawPolygon(starPolygon, Qt::WindingFill);
++ else if (mode == EditMode::Editable)
++ painter->drawPolygon(diamondPolygon, Qt::WindingFill);
++ painter->translate(1.0, 0.0);
++ }
++
++ painter->restore();
++ }
++ //! [2]