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renderarea.cpp

/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
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** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
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** 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
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** 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
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** packaging of this file.  Please review the following information to
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#include <QtGui>

#include "renderarea.h"

//! [0]
00047 RenderArea::RenderArea(QWidget *parent)
    : QWidget(parent)
{
    shape = Polygon;
    antialiased = false;
    transformed = false;
    pixmap.load(":/images/qt-logo.png");

    setBackgroundRole(QPalette::Base);
    setAutoFillBackground(true);
}
//! [0]

//! [1]
QSize RenderArea::minimumSizeHint() const
{
    return QSize(100, 100);
}
//! [1]

//! [2]
00068 QSize RenderArea::sizeHint() const
{
    return QSize(400, 200);
}
//! [2]

//! [3]
00075 void RenderArea::setShape(Shape shape)
{
    this->shape = shape;
    update();
}
//! [3]

//! [4]
00083 void RenderArea::setPen(const QPen &pen)
{
    this->pen = pen;
    update();
}
//! [4]

//! [5]
00091 void RenderArea::setBrush(const QBrush &brush)
{
    this->brush = brush;
    update();
}
//! [5]

//! [6]
00099 void RenderArea::setAntialiased(bool antialiased)
{
    this->antialiased = antialiased;
    update();
}
//! [6]

//! [7]
00107 void RenderArea::setTransformed(bool transformed)
{
    this->transformed = transformed;
    update();
}
//! [7]

//! [8]
void RenderArea::paintEvent(QPaintEvent * /* event */)
{
    static const QPoint points[4] = {
        QPoint(10, 80),
        QPoint(20, 10),
        QPoint(80, 30),
        QPoint(90, 70)
    };

    QRect rect(10, 20, 80, 60);

    QPainterPath path;
    path.moveTo(20, 80);
    path.lineTo(20, 30);
    path.cubicTo(80, 0, 50, 50, 80, 80);

    int startAngle = 20 * 16;
    int arcLength = 120 * 16;
//! [8]

//! [9]
    QPainter painter(this);
    painter.setPen(pen);
    painter.setBrush(brush);
    if (antialiased) {
        painter.setRenderHint(QPainter::Antialiasing, true);
//! [9]
        painter.translate(+0.5, +0.5);
    }

//! [10]
    for (int x = 0; x < width(); x += 100) {
        for (int y = 0; y < height(); y += 100) {
            painter.save();
            painter.translate(x, y);
//! [10] //! [11]
            if (transformed) {
                painter.translate(50, 50);
                painter.rotate(60.0);
                painter.scale(0.6, 0.9);
                painter.translate(-50, -50);
            }
//! [11]

//! [12]
            switch (shape) {
            case Line:
                painter.drawLine(rect.bottomLeft(), rect.topRight());
                break;
            case Points:
                painter.drawPoints(points, 4);
                break;
            case Polyline:
                painter.drawPolyline(points, 4);
                break;
            case Polygon:
                painter.drawPolygon(points, 4);
                break;
            case Rect:
                painter.drawRect(rect);
                break;
            case RoundedRect:
                painter.drawRoundedRect(rect, 25, 25, Qt::RelativeSize);
                break;
            case Ellipse:
                painter.drawEllipse(rect);
                break;
            case Arc:
                painter.drawArc(rect, startAngle, arcLength);
                break;
            case Chord:
                painter.drawChord(rect, startAngle, arcLength);
                break;
            case Pie:
                painter.drawPie(rect, startAngle, arcLength);
                break;
            case Path:
                painter.drawPath(path);
                break;
            case Text:
                painter.drawText(rect, Qt::AlignCenter, tr("Qt by\nNokia"));
                break;
            case Pixmap:
                painter.drawPixmap(10, 10, pixmap);
            }
//! [12] //! [13]
            painter.restore();
        }
    }

    painter.setPen(palette().dark().color());
    painter.setBrush(Qt::NoBrush);
    painter.drawRect(QRect(0, 0, width() - 1, height() - 1));
}
//! [13]

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