source: trunk/examples/openvg/star/starwidget.cpp@ 769

Last change on this file since 769 was 769, checked in by Dmitry A. Kuminov, 15 years ago

trunk: Merged in qt 4.6.3 sources from branches/vendor/nokia/qt.

  • Property svn:eol-style set to native
File size: 4.1 KB
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1/****************************************************************************
2**
3** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
4** All rights reserved.
5** Contact: Nokia Corporation ([email protected])
6**
7** This file is part of the QtOpenGL module of the Qt Toolkit.
8**
9** $QT_BEGIN_LICENSE:LGPL$
10** Commercial Usage
11** Licensees holding valid Qt Commercial licenses may use this file in
12** accordance with the Qt Commercial License Agreement provided with the
13** Software or, alternatively, in accordance with the terms contained in
14** a written agreement between you and Nokia.
15**
16** GNU Lesser General Public License Usage
17** Alternatively, this file may be used under the terms of the GNU Lesser
18** General Public License version 2.1 as published by the Free Software
19** Foundation and appearing in the file LICENSE.LGPL included in the
20** packaging of this file. Please review the following information to
21** ensure the GNU Lesser General Public License version 2.1 requirements
22** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
23**
24** In addition, as a special exception, Nokia gives you certain additional
25** rights. These rights are described in the Nokia Qt LGPL Exception
26** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
27**
28** GNU General Public License Usage
29** Alternatively, this file may be used under the terms of the GNU
30** General Public License version 3.0 as published by the Free Software
31** Foundation and appearing in the file LICENSE.GPL included in the
32** packaging of this file. Please review the following information to
33** ensure the GNU General Public License version 3.0 requirements will be
34** met: http://www.gnu.org/copyleft/gpl.html.
35**
36** If you have questions regarding the use of this file, please contact
37** Nokia at [email protected].
38** $QT_END_LICENSE$
39**
40****************************************************************************/
41
42#include "starwidget.h"
43
44StarWidget::StarWidget(QWidget *parent)
45 : QWidget(parent)
46 , path(VG_INVALID_HANDLE)
47 , pen(Qt::red, 4.0, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin)
48 , brush(Qt::yellow)
49{
50 setMinimumSize(220, 250);
51 setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);
52}
53
54static VGubyte const starSegments[] = {
55 VG_MOVE_TO_ABS,
56 VG_LINE_TO_REL,
57 VG_LINE_TO_REL,
58 VG_LINE_TO_REL,
59 VG_LINE_TO_REL,
60 VG_CLOSE_PATH
61};
62static VGfloat const starCoords[] = {
63 110, 35,
64 50, 160,
65 -130, -100,
66 160, 0,
67 -130, 100
68};
69
70void StarWidget::paintEvent(QPaintEvent *)
71{
72 QPainter painter;
73 painter.begin(this);
74
75 // Make sure that we are using the OpenVG paint engine.
76 if (painter.paintEngine()->type() != QPaintEngine::OpenVG) {
77#ifdef Q_WS_QWS
78 qWarning("Not using OpenVG: use the '-display' option to specify an OpenVG driver");
79#else
80 qWarning("Not using OpenVG: specify '-graphicssystem OpenVG'");
81#endif
82 return;
83 }
84
85 // Select a pen and a brush for drawing the star.
86 painter.setPen(pen);
87 painter.setBrush(brush);
88
89 // We want the star border to be anti-aliased.
90 painter.setRenderHints(QPainter::Antialiasing);
91
92 // Flush the state changes to the OpenVG implementation
93 // and prepare to perform raw OpenVG calls.
94 painter.beginNativePainting();
95
96 // Cache the path if we haven't already or if the path has
97 // become invalid because the window's context has changed.
98 if (path == VG_INVALID_HANDLE || !vgGetPathCapabilities(path)) {
99 path = vgCreatePath(VG_PATH_FORMAT_STANDARD,
100 VG_PATH_DATATYPE_F,
101 1.0f, // scale
102 0.0f, // bias
103 6, // segmentCapacityHint
104 10, // coordCapacityHint
105 VG_PATH_CAPABILITY_ALL);
106 vgAppendPathData(path, sizeof(starSegments), starSegments, starCoords);
107 }
108
109 // Draw the star directly using the OpenVG API.
110 vgDrawPath(path, VG_FILL_PATH | VG_STROKE_PATH);
111
112 // Restore normal QPainter operations.
113 painter.endNativePainting();
114
115 painter.end();
116}
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