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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2010 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 documentation 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 <qapplication.h> |
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43 #include <qlabel.h> |
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44 #include <qpixmap.h> |
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45 #include <qprinter.h> |
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46 #include <qpainter.h> |
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47 #include <qfile.h> |
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48 #include <qdir.h> |
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49 #include <qfileinfo.h> |
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50 #include <QtGui> |
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51 #include <QtCore> |
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52 |
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53 class MyClass : public QWidget |
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54 { |
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55 public: |
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56 MyClass(QWidget *parent = 0) : QWidget(parent) { } |
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57 |
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58 protected: |
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59 void paintEvent(QPaintEvent *e) |
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60 { |
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61 /*QRadialGradient rg(50, 50, 50, 50, 50); |
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62 rg.setColorAt(0, QColor::fromRgbF(1, 0, 0, 1)); |
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63 rg.setColorAt(1, QColor::fromRgbF(0, 0, 0, 0)); |
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64 QPainter pmp(&pm); |
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65 pmp.fillRect(0, 0, 100, 100, rg); |
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66 pmp.end();*/ |
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67 |
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68 createImage(); |
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69 |
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70 QPainter p(this); |
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71 p.fillRect(rect(), Qt::white); |
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72 |
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73 p.drawPixmap(0, 0, pixmap); |
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74 |
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75 p.drawPixmap(100, 0, channelImage); |
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76 } |
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77 |
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78 void createImage() |
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79 { |
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80 //! [0] |
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81 pixmap = QPixmap(100, 100); |
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82 pixmap.fill(Qt::transparent); |
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83 |
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84 QRadialGradient gradient(50, 50, 50, 50, 50); |
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85 gradient.setColorAt(0, QColor::fromRgbF(1, 0, 0, 1)); |
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86 gradient.setColorAt(1, QColor::fromRgbF(0, 0, 0, 0)); |
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87 QPainter painter(&pixmap); |
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88 painter.fillRect(0, 0, 100, 100, gradient); |
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89 |
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90 channelImage = pixmap.alphaChannel(); |
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91 update(); |
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92 //! [0] |
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93 } |
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94 |
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95 QPixmap channelImage, pixmap; |
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96 QSize sizeHint() const { return QSize(500, 500); } |
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97 }; |
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98 |
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99 int main(int argc, char **argv) |
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100 { |
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101 QApplication app(argc, argv); |
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102 |
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103 MyClass cl; |
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104 cl.show(); |
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105 QObject::connect(&app, SIGNAL(lastWindowClosed()), &app, SLOT(quit())); |
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106 |
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107 int ret = app.exec(); |
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108 return ret; |
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109 } |