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<td align="right" valign="top" width="230"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></td></tr></table><h1 align="center">renderarea.cpp Example File<br /><small><small>painting/basicdrawing/renderarea.cpp</small></small></h1>

<pre>  /****************************************************************************

** This file is part of the documentation of the Qt Toolkit.

** This file may be distributed under the terms of the Q Public License

** as defined by Trolltech AS of Norway and appearing in the file

** LICENSE.QPL included in the packaging of this file.

** This file may be distributed and/or modified under the terms of the

** GNU General Public License version 2 as published by the Free Software

** Foundation and appearing in the file LICENSE.GPL included in the

** packaging of this file.

** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for

** information about Qt Commercial License Agreements.

** See http://www.trolltech.com/qpl/ for QPL licensing information.

** See http://www.trolltech.com/gpl/ for GPL licensing information.

** Contact info@trolltech.com if any conditions of this licensing are

** not clear to you.

** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE

** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

****************************************************************************/

#include <QtGui>

#include "renderarea.h"

RenderArea::RenderArea(QWidget *parent)

: QWidget(parent)

{

shape = Polygon;

antialiased = false;

pixmap.load(":/images/qt-logo.png");

setBackgroundRole(QPalette::Base);

}

QSize RenderArea::minimumSizeHint() const

{

return QSize(100, 100);

}

QSize RenderArea::sizeHint() const

{

return QSize(400, 200);

}

void RenderArea::setShape(Shape shape)

{

this->shape = shape;

update();

}

void RenderArea::setPen(const QPen &pen)

{

this->pen = pen;

update();

}

void RenderArea::setBrush(const QBrush &brush)

{

this->brush = brush;

update();

}

void RenderArea::setAntialiased(bool antialiased)

{

this->antialiased = antialiased;

update();

}

void RenderArea::setTransformed(bool transformed)

{

this->transformed = transformed;

update();

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}

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void RenderArea::paintEvent(QPaintEvent *)

103

{

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static const int polygonPoints[8] = { 10, 80, 20, 10, 80, 30, 90, 70 };

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QPolygon polygon(4, polygonPoints);

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

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QPainterPath path;

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path.moveTo(20, 80);

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path.lineTo(20, 30);

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path.cubicTo(80, 0, 50, 50, 80, 80);

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int startAngle = 30 * 16;

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int arcLength = 120 * 16;

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QPainter painter(this);

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painter.setPen(pen);

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painter.setBrush(brush);

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if (antialiased)

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painter.setRenderHint(QPainter::Antialiasing);

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for (int x = 0; x < width(); x += 100) {

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for (int y = 0; y < height(); y += 100) {

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painter.save();

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painter.translate(x, y);

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if (transformed) {

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painter.translate(50, 50);

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painter.rotate(60.0);

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painter.scale(0.6, 0.9);

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painter.translate(-50, -50);

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}

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switch (shape) {

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case Line:

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painter.drawLine(rect.bottomLeft(), rect.topRight());

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break;

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case Points:

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painter.drawPoints(polygon);

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break;

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case Polyline:

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painter.drawPolyline(polygon);

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break;

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case Polygon:

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painter.drawPolygon(polygon);

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break;

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case Rect:

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painter.drawRect(rect);

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break;

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case RoundRect:

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painter.drawRoundRect(rect);

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break;

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case Ellipse:

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painter.drawEllipse(rect);

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break;

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case Arc:

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painter.drawArc(rect, startAngle, arcLength);

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break;

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case Chord:

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painter.drawChord(rect, startAngle, arcLength);

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break;

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case Pie:

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painter.drawPie(rect, startAngle, arcLength);

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break;

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case Path:

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painter.drawPath(path);

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break;

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case Text:

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painter.drawText(rect, Qt::AlignCenter, tr("Qt by\nTrolltech"));

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break;

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case Pixmap:

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painter.drawPixmap(10, 10, pixmap);

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}

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painter.restore();

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}

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}

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}</pre>

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