/****************************************************************************+
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**+
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the QtOpenGL module of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include "starwidget.h"+
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+
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StarWidget::StarWidget(QWidget *parent)+
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    : QWidget(parent)+
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    , path(VG_INVALID_HANDLE)+
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    , pen(Qt::red, 4.0, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin)+
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    , brush(Qt::yellow)+
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{+
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    setMinimumSize(220, 250);+
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    setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);+
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}+
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+
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static VGubyte const starSegments[] = {+
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    VG_MOVE_TO_ABS,+
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    VG_LINE_TO_REL,+
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    VG_LINE_TO_REL,+
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    VG_LINE_TO_REL,+
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    VG_LINE_TO_REL,+
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    VG_CLOSE_PATH+
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};+
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static VGfloat const starCoords[] = {+
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    110, 35,+
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    50, 160,+
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    -130, -100,+
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    160, 0,+
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    -130, 100+
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};+
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+
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void StarWidget::paintEvent(QPaintEvent *)+
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{+
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    QPainter painter;+
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    painter.begin(this);+
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+
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    // Make sure that we are using the OpenVG paint engine.+
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    if (painter.paintEngine()->type() != QPaintEngine::OpenVG) {+
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#ifdef Q_WS_QWS+
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        qWarning("Not using OpenVG: use the '-display' option to specify an OpenVG driver");+
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#else+
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        qWarning("Not using OpenVG: specify '-graphicssystem OpenVG'");+
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#endif+
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        return;+
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    }+
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+
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    // Select a pen and a brush for drawing the star.+
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    painter.setPen(pen);+
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    painter.setBrush(brush);+
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+
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    // We want the star border to be anti-aliased.+
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    painter.setRenderHints(QPainter::Antialiasing);+
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+
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    // Flush the state changes to the OpenVG implementation+
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    // and prepare to perform raw OpenVG calls.+
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    painter.beginNativePainting();+
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+
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    // Cache the path if we haven't already.+
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    if (path == VG_INVALID_HANDLE) {+
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        path = vgCreatePath(VG_PATH_FORMAT_STANDARD,+
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                            VG_PATH_DATATYPE_F,+
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                            1.0f, // scale+
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                            0.0f, // bias+
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                            6,    // segmentCapacityHint+
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                            10,   // coordCapacityHint+
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                            VG_PATH_CAPABILITY_ALL);+
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        vgAppendPathData(path, sizeof(starSegments), starSegments, starCoords);+
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    }+
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+
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    // Draw the star directly using the OpenVG API.+
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    vgDrawPath(path, VG_FILL_PATH | VG_STROKE_PATH);+
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+
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    // Restore normal QPainter operations.+
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    painter.endNativePainting();+
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+
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    painter.end();+
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}+
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