| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the examples of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:BSD$ |
| ** Commercial License Usage |
| ** Licensees holding valid commercial Qt licenses may use this file in |
| ** accordance with the commercial license agreement provided with the |
| ** Software or, alternatively, in accordance with the terms contained in |
| ** a written agreement between you and The Qt Company. For licensing terms |
| ** and conditions see https://www.qt.io/terms-conditions. For further |
| ** information use the contact form at https://www.qt.io/contact-us. |
| ** |
| ** BSD License Usage |
| ** Alternatively, you may use this file under the terms of the BSD license |
| ** as follows: |
| ** |
| ** "Redistribution and use in source and binary forms, with or without |
| ** modification, are permitted provided that the following conditions are |
| ** met: |
| ** * Redistributions of source code must retain the above copyright |
| ** notice, this list of conditions and the following disclaimer. |
| ** * Redistributions in binary form must reproduce the above copyright |
| ** notice, this list of conditions and the following disclaimer in |
| ** the documentation and/or other materials provided with the |
| ** distribution. |
| ** * Neither the name of The Qt Company Ltd nor the names of its |
| ** contributors may be used to endorse or promote products derived |
| ** from this software without specific prior written permission. |
| ** |
| ** |
| ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." |
| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #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] |