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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 QtOpenGL module 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 "starwidget.h" |
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43 |
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44 StarWidget::StarWidget(QWidget *parent) |
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45 : QWidget(parent) |
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46 , path(VG_INVALID_HANDLE) |
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47 , pen(Qt::red, 4.0, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin) |
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48 , brush(Qt::yellow) |
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49 { |
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50 setMinimumSize(220, 250); |
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51 setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding); |
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52 } |
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53 |
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54 static VGubyte const starSegments[] = { |
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55 VG_MOVE_TO_ABS, |
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56 VG_LINE_TO_REL, |
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57 VG_LINE_TO_REL, |
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58 VG_LINE_TO_REL, |
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59 VG_LINE_TO_REL, |
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60 VG_CLOSE_PATH |
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61 }; |
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62 static VGfloat const starCoords[] = { |
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63 110, 35, |
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64 50, 160, |
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65 -130, -100, |
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66 160, 0, |
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67 -130, 100 |
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68 }; |
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69 |
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70 void StarWidget::paintEvent(QPaintEvent *) |
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71 { |
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72 QPainter painter; |
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73 painter.begin(this); |
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74 |
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75 // Make sure that we are using the OpenVG paint engine. |
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76 if (painter.paintEngine()->type() != QPaintEngine::OpenVG) { |
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77 #ifdef Q_WS_QWS |
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78 qWarning("Not using OpenVG: use the '-display' option to specify an OpenVG driver"); |
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79 #else |
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80 qWarning("Not using OpenVG: specify '-graphicssystem OpenVG'"); |
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81 #endif |
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82 return; |
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83 } |
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84 |
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85 // Select a pen and a brush for drawing the star. |
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86 painter.setPen(pen); |
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87 painter.setBrush(brush); |
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88 |
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89 // We want the star border to be anti-aliased. |
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90 painter.setRenderHints(QPainter::Antialiasing); |
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91 |
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92 // Flush the state changes to the OpenVG implementation |
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93 // and prepare to perform raw OpenVG calls. |
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94 painter.beginNativePainting(); |
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95 |
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96 // Cache the path if we haven't already. |
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97 if (path == VG_INVALID_HANDLE) { |
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98 path = vgCreatePath(VG_PATH_FORMAT_STANDARD, |
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99 VG_PATH_DATATYPE_F, |
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100 1.0f, // scale |
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101 0.0f, // bias |
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102 6, // segmentCapacityHint |
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103 10, // coordCapacityHint |
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104 VG_PATH_CAPABILITY_ALL); |
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105 vgAppendPathData(path, sizeof(starSegments), starSegments, starCoords); |
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106 } |
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107 |
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108 // Draw the star directly using the OpenVG API. |
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109 vgDrawPath(path, VG_FILL_PATH | VG_STROKE_PATH); |
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110 |
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111 // Restore normal QPainter operations. |
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112 painter.endNativePainting(); |
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113 |
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114 painter.end(); |
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115 } |