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 ([email protected])
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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 | ** Commercial Usage
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11 | ** Licensees holding valid Qt Commercial licenses may use this file in
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12 | ** accordance with the Qt Commercial License Agreement provided with the
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13 | ** Software or, alternatively, in accordance with the terms contained in
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14 | ** a written agreement between you and Nokia.
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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 | ** GNU General Public License Usage
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29 | ** Alternatively, this file may be used under the terms of the GNU
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30 | ** General Public License version 3.0 as published by the Free Software
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31 | ** Foundation and appearing in the file LICENSE.GPL included in the
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32 | ** packaging of this file. Please review the following information to
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33 | ** ensure the GNU General Public License version 3.0 requirements will be
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34 | ** met: http://www.gnu.org/copyleft/gpl.html.
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35 | **
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36 | ** If you have questions regarding the use of this file, please contact
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37 | ** Nokia at [email protected].
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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 or if the path has
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97 | // become invalid because the window's context has changed.
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98 | if (path == VG_INVALID_HANDLE || !vgGetPathCapabilities(path)) {
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99 | path = vgCreatePath(VG_PATH_FORMAT_STANDARD,
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100 | VG_PATH_DATATYPE_F,
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101 | 1.0f, // scale
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102 | 0.0f, // bias
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103 | 6, // segmentCapacityHint
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104 | 10, // coordCapacityHint
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105 | VG_PATH_CAPABILITY_ALL);
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106 | vgAppendPathData(path, sizeof(starSegments), starSegments, starCoords);
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107 | }
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108 |
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109 | // Draw the star directly using the OpenVG API.
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110 | vgDrawPath(path, VG_FILL_PATH | VG_STROKE_PATH);
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111 |
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112 | // Restore normal QPainter operations.
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113 | painter.endNativePainting();
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114 |
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115 | painter.end();
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116 | }
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