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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the examples of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 #include <QtGui> |
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43 |
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44 #include "circlewidget.h" |
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45 |
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46 #include <stdlib.h> |
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47 |
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48 //! [0] |
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49 CircleWidget::CircleWidget(QWidget *parent) |
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50 : QWidget(parent) |
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51 { |
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52 floatBased = false; |
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53 antialiased = false; |
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54 frameNo = 0; |
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55 |
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56 setBackgroundRole(QPalette::Base); |
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57 setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding); |
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58 } |
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59 //! [0] |
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60 |
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61 //! [1] |
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62 void CircleWidget::setFloatBased(bool floatBased) |
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63 { |
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64 this->floatBased = floatBased; |
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65 update(); |
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66 } |
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67 //! [1] |
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68 |
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69 //! [2] |
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70 void CircleWidget::setAntialiased(bool antialiased) |
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71 { |
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72 this->antialiased = antialiased; |
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73 update(); |
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74 } |
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75 //! [2] |
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76 |
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77 //! [3] |
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78 QSize CircleWidget::minimumSizeHint() const |
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79 { |
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80 return QSize(50, 50); |
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81 } |
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82 //! [3] |
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83 |
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84 //! [4] |
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85 QSize CircleWidget::sizeHint() const |
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86 { |
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87 return QSize(180, 180); |
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88 } |
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89 //! [4] |
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90 |
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91 //! [5] |
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92 void CircleWidget::nextAnimationFrame() |
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93 { |
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94 ++frameNo; |
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95 update(); |
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96 } |
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97 //! [5] |
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98 |
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99 //! [6] |
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100 void CircleWidget::paintEvent(QPaintEvent *) |
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101 { |
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102 QPainter painter(this); |
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103 painter.setRenderHint(QPainter::Antialiasing, antialiased); |
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104 painter.translate(width() / 2, height() / 2); |
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105 //! [6] |
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106 |
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107 //! [7] |
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108 for (int diameter = 0; diameter < 256; diameter += 9) { |
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109 int delta = abs((frameNo % 128) - diameter / 2); |
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110 int alpha = 255 - (delta * delta) / 4 - diameter; |
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111 //! [7] //! [8] |
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112 if (alpha > 0) { |
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113 painter.setPen(QPen(QColor(0, diameter / 2, 127, alpha), 3)); |
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114 |
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115 if (floatBased) { |
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116 painter.drawEllipse(QRectF(-diameter / 2.0, -diameter / 2.0, |
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117 diameter, diameter)); |
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118 } else { |
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119 painter.drawEllipse(QRect(-diameter / 2, -diameter / 2, |
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120 diameter, diameter)); |
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121 } |
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122 } |
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123 } |
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124 } |
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125 //! [8] |