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Viewing changes to examples/painting/transformations/renderarea.cpp

  • Committer: Bazaar Package Importer
  • Author(s): Adam Conrad
  • Date: 2005-08-24 04:09:09 UTC
  • Revision ID: james.westby@ubuntu.com-20050824040909-xmxe9jfr4a0w5671
Tags: upstream-4.0.0
Import upstream version 4.0.0

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examples/painting/transformations/renderarea.cpp
 
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/****************************************************************************
 
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**
 
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** Copyright (C) 2005-2005 Trolltech AS. All rights reserved.
 
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**
 
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** This file is part of the example classes of the Qt Toolkit.
 
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**
 
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** This file may be distributed under the terms of the Q Public License
 
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** as defined by Trolltech AS of Norway and appearing in the file
 
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** LICENSE.QPL included in the packaging of this file.
 
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**
 
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** This file may be distributed and/or modified under the terms of the
 
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** GNU General Public License version 2 as published by the Free Software
 
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** Foundation and appearing in the file LICENSE.GPL included in the
 
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** packaging of this file.
 
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**
 
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** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
 
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**   information about Qt Commercial License Agreements.
 
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** See http://www.trolltech.com/qpl/ for QPL licensing information.
 
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** See http://www.trolltech.com/gpl/ for GPL licensing information.
 
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**
 
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** Contact info@trolltech.com if any conditions of this licensing are
 
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** not clear to you.
 
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**
 
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 
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** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 
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**
 
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****************************************************************************/
 
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#include <QtGui>
 
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#include "renderarea.h"
 
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RenderArea::RenderArea(QWidget *parent)
 
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    : QWidget(parent)
 
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{
 
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    QFont newFont = font();
 
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    newFont.setPixelSize(12);
 
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    setFont(newFont);
 
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    QFontMetrics fontMetrics(newFont);
 
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    xBoundingRect = fontMetrics.boundingRect(tr("x"));
 
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    yBoundingRect = fontMetrics.boundingRect(tr("y"));
 
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}
 
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void RenderArea::setOperations(const QList<Operation> &operations)
 
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{
 
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    this->operations = operations;
 
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    update();
 
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}
 
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void RenderArea::setShape(const QPainterPath &shape)
 
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{
 
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    this->shape = shape;
 
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    update();
 
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}
 
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QSize RenderArea::minimumSizeHint() const
 
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{
 
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    return QSize(50, 50);
 
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}
 
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QSize RenderArea::sizeHint() const
 
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{
 
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    return QSize(232, 232);
 
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}
 
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void RenderArea::paintEvent(QPaintEvent *event)
 
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{
 
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    QPainter painter(this);
 
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    painter.setRenderHint(QPainter::Antialiasing);
 
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    painter.fillRect(event->rect(), QBrush(Qt::white));
 
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    painter.translate(66, 66);
 
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    painter.save();
 
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    transformPainter(painter);
 
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    drawShape(painter);
 
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    painter.restore();
 
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    drawOutline(painter);
 
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    painter.save();
 
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    transformPainter(painter);
 
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    drawCoordinates(painter);
 
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    painter.restore();
 
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}
 
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void RenderArea::drawCoordinates(QPainter &painter)
 
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{
 
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    painter.setPen(Qt::red);
 
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    painter.drawLine(0, 0, 50, 0);
 
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    painter.drawLine(48, -2, 50, 0);
 
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    painter.drawLine(48, 2, 50, 0);
 
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    painter.drawText(60 - xBoundingRect.width() / 2,
 
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                     0 + xBoundingRect.height() / 2, tr("x"));
 
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    painter.drawLine(0, 0, 0, 50);
 
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    painter.drawLine(-2, 48, 0, 50);
 
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    painter.drawLine(2, 48, 0, 50);
 
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    painter.drawText(0 - yBoundingRect.width() / 2,
 
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                     60 + yBoundingRect.height() / 2, tr("y"));
 
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}
 
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void RenderArea::drawOutline(QPainter &painter)
 
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{
 
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    painter.setPen(Qt::darkGreen);
 
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    painter.setPen(Qt::DashLine);
 
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    painter.setBrush(Qt::NoBrush);
 
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    painter.drawRect(0, 0, 100, 100);
 
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}
 
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void RenderArea::drawShape(QPainter &painter)
 
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{
 
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    painter.fillPath(shape, Qt::blue);
 
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}
 
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void RenderArea::transformPainter(QPainter &painter)
 
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{
 
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    for (int i = 0; i < operations.size(); ++i) {
 
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        switch (operations[i]) {
 
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        case Translate:
 
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            painter.translate(50, 50);
 
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            break;
 
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        case Scale:
 
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            painter.scale(0.75, 0.75);
 
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            break;
 
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        case Rotate:
 
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            painter.rotate(60);
 
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            break;
 
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        case NoTransformation:
 
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        default:
 
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            ;
 
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        }
 
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    }
 
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}