/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
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** This file is part of the documentation of the Qt Toolkit.
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** modification, are permitted provided that the following conditions are
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**     notice, this list of conditions and the following disclaimer.
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**     the documentation and/or other materials provided with the
**     distribution.
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//! [0]
QLinearGradient gradient(0, 0, 100, 100);
gradient.setColorAt(0, Qt::red);
gradient.setColorAt(0.5, Qt::green);
gradient.setColorAt(1, Qt::blue);
painter.setBrush(gradient);
painter.drawRect(0, 0, 100, 100);
//! [0]


//! [1]
QRadialGradient gradient(50, 50, 50, 30, 30);
gradient.setColorAt(0.2, Qt::white);
gradient.setColorAt(0.8, Qt::green);
gradient.setColorAt(1, Qt::black);
painter.setBrush(gradient);
painter.drawEllipse(0, 0, 100, 100);
//! [1]


//! [2]
QConicalGradient gradient(60, 40, 0);
gradient.setColorAt(0, Qt::black);
gradient.setColorAt(0.4, Qt::green);
gradient.setColorAt(0.6, Qt::white);
gradient.setColorAt(1, Qt::black);
painter.setBrush(gradient);
painter.drawEllipse(0, 0, 100, 100);
//! [2]


//! [3]
// Specfiy semi-transparent red
painter.setBrush(QColor(255, 0, 0, 127));
painter.drawRect(0, 0, width()/2, height());

// Specify semi-transparent blue
painter.setBrush(QColor(0, 0, 255, 127));
painter.drawRect(0, 0, width(), height()/2);
//! [3]


//! [4]
// One line without anti-aliasing
painter.drawLine(0, 0, width()/2, height());

// One line with anti-aliasing
painter.setRenderHint(QPainter::Antialiasing);
painter.drawLine(width()/2, 0, width(), height());
//! [4]


//! [5]
QPainterPath path;
path.addRect(20, 20, 60, 60);
path.moveTo(0, 0);
path.cubicTo(99, 0, 50, 50, 99, 99);
path.cubicTo(0, 99, 50, 50, 0, 0);
painter.drawPath(path);
//! [5]


//! [6]
QPixmap buffer(size());
QPainter painter(&buffer);

// Paint code here

painter.end();
bitBlt(this, 0, 0, &buffer);
//! [6]


//! [7]
QPainter painter(this);

// Paint code here

painter.end();
//! [7]


//! [8]
unbufferedWidget->setAttribute(Qt::WA_PaintOnScreen);
//! [8]


//! [9]
QLinearGradient gradient(0, 0, 100, 100);
gradient.setColorAt(0, Qt::blue);
gradient.setColorAt(1, Qt::red);
painter.setPen(QPen(gradient, 0));
for (int y=fontSize; y<100; y+=fontSize)
    drawText(0, y, text);
//! [9]


//! [10]
QImage image(100, 100, 32);
QPainter painter(&image);

// painter commands.

painter.end();
//! [10]