qt5base-lts/examples/opengl/2dpainting/helper.cpp
Lars Knoll e510b6e466 include fixes
Fixed the include statements
added QT+=widgets in examples/network to
get them to compile. Will need something better
than doing it manually.
2011-05-07 22:57:49 +02:00

91 lines
3.2 KiB
C++

/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples 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
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** the documentation and/or other materials provided with the
** distribution.
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** permission.
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** $QT_END_LICENSE$
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****************************************************************************/
#include <QtWidgets>
#include "helper.h"
//! [0]
Helper::Helper()
{
QLinearGradient gradient(QPointF(50, -20), QPointF(80, 20));
gradient.setColorAt(0.0, Qt::white);
gradient.setColorAt(1.0, QColor(0xa6, 0xce, 0x39));
background = QBrush(QColor(64, 32, 64));
circleBrush = QBrush(gradient);
circlePen = QPen(Qt::black);
circlePen.setWidth(1);
textPen = QPen(Qt::white);
textFont.setPixelSize(50);
}
//! [0]
//! [1]
void Helper::paint(QPainter *painter, QPaintEvent *event, int elapsed)
{
painter->fillRect(event->rect(), background);
painter->translate(100, 100);
//! [1]
//! [2]
painter->save();
painter->setBrush(circleBrush);
painter->setPen(circlePen);
painter->rotate(elapsed * 0.030);
qreal r = elapsed/1000.0;
int n = 30;
for (int i = 0; i < n; ++i) {
painter->rotate(30);
qreal radius = 0 + 120.0*((i+r)/n);
qreal circleRadius = 1 + ((i+r)/n)*20;
painter->drawEllipse(QRectF(radius, -circleRadius,
circleRadius*2, circleRadius*2));
}
painter->restore();
//! [2]
//! [3]
painter->setPen(textPen);
painter->setFont(textFont);
painter->drawText(QRect(-50, -50, 100, 100), Qt::AlignCenter, "Qt");
}
//! [3]