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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.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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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