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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtOpenGL module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "starwidget.h"
StarWidget::StarWidget(QWidget *parent)
: QWidget(parent)
, path(VG_INVALID_HANDLE)
, pen(Qt::red, 4.0, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin)
, brush(Qt::yellow)
{
setMinimumSize(220, 250);
setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);
}
static VGubyte const starSegments[] = {
VG_MOVE_TO_ABS,
VG_LINE_TO_REL,
VG_LINE_TO_REL,
VG_LINE_TO_REL,
VG_LINE_TO_REL,
VG_CLOSE_PATH
};
static VGfloat const starCoords[] = {
110, 35,
50, 160,
-130, -100,
160, 0,
-130, 100
};
void StarWidget::paintEvent(QPaintEvent *)
{
QPainter painter;
painter.begin(this);
// Make sure that we are using the OpenVG paint engine.
if (painter.paintEngine()->type() != QPaintEngine::OpenVG) {
#ifdef Q_WS_QWS
qWarning("Not using OpenVG: use the '-display' option to specify an OpenVG driver");
#else
qWarning("Not using OpenVG: specify '-graphicssystem OpenVG'");
#endif
return;
}
// Select a pen and a brush for drawing the star.
painter.setPen(pen);
painter.setBrush(brush);
// We want the star border to be anti-aliased.
painter.setRenderHints(QPainter::Antialiasing);
// Flush the state changes to the OpenVG implementation
// and prepare to perform raw OpenVG calls.
painter.beginNativePainting();
// Cache the path if we haven't already or if the path has
// become invalid because the window's context has changed.
if (path == VG_INVALID_HANDLE || !vgGetPathCapabilities(path)) {
path = vgCreatePath(VG_PATH_FORMAT_STANDARD,
VG_PATH_DATATYPE_F,
1.0f, // scale
0.0f, // bias
6, // segmentCapacityHint
10, // coordCapacityHint
VG_PATH_CAPABILITY_ALL);
vgAppendPathData(path, sizeof(starSegments), starSegments, starCoords);
}
// Draw the star directly using the OpenVG API.
vgDrawPath(path, VG_FILL_PATH | VG_STROKE_PATH);
// Restore normal QPainter operations.
painter.endNativePainting();
painter.end();
}
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