renderarea.cpp Example File
painting/basicdrawing/renderarea.cpp
/****************************************************************************
**
** Copyright (C) 2005-2005 Trolltech AS. All rights reserved.
**
** 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.
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** information about Qt Commercial License Agreements.
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** See http://www.trolltech.com/gpl/ for GPL licensing information.
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#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();
}
void RenderArea::paintEvent(QPaintEvent *)
{
static const int polygonPoints[8] = { 10, 80, 20, 10, 80, 30, 90, 70 };
QPolygon polygon(4, polygonPoints);
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 = 30 * 16;
int arcLength = 120 * 16;
QPainter painter(this);
painter.setPen(pen);
painter.setBrush(brush);
if (antialiased)
painter.setRenderHint(QPainter::Antialiasing);
for (int x = 0; x < width(); x += 100) {
for (int y = 0; y < height(); y += 100) {
painter.save();
painter.translate(x, y);
if (transformed) {
painter.translate(50, 50);
painter.rotate(60.0);
painter.scale(0.6, 0.9);
painter.translate(-50, -50);
}
switch (shape) {
case Line:
painter.drawLine(rect.bottomLeft(), rect.topRight());
break;
case Points:
painter.drawPoints(polygon);
break;
case Polyline:
painter.drawPolyline(polygon);
break;
case Polygon:
painter.drawPolygon(polygon);
break;
case Rect:
painter.drawRect(rect);
break;
case RoundRect:
painter.drawRoundRect(rect);
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\nTrolltech"));
break;
case Pixmap:
painter.drawPixmap(10, 10, pixmap);
}
painter.restore();
}
}
}