demos/qtdemo/headingitem.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 22 Jan 2010 10:32:13 +0200
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Revision: 201001 Kit: 201003
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/****************************************************************************
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**
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the demonstration applications of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "headingitem.h"
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#include "colors.h"
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HeadingItem::HeadingItem(const QString &text, QGraphicsScene *scene, QGraphicsItem *parent)
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    : DemoItem(scene, parent)
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{
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    this->text = text;
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    this->noSubPixeling = true;
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}
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QImage *HeadingItem::createImage(const QMatrix &matrix) const
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{
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    float sx = qMin(matrix.m11(), matrix.m22());
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    float sy = matrix.m22() < sx ? sx : matrix.m22();
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    QFontMetrics fm(Colors::headingFont());
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    float w = fm.width(this->text) + 1;
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    float h = fm.height();
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    float xShadow = 3.0f;
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    float yShadow = 3.0f;
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    QImage *image = new QImage(int((w + xShadow) * sx), int((h + yShadow) * sy), QImage::Format_ARGB32_Premultiplied);
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    image->fill(QColor(0, 0, 0, 0).rgba());
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    QPainter painter(image);
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    painter.setFont(Colors::headingFont());
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    painter.scale(sx, sy);
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    //draw shadow
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    QLinearGradient brush_shadow(xShadow, yShadow, w, yShadow);
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    brush_shadow.setSpread(QLinearGradient::PadSpread);
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    if (Colors::useEightBitPalette)
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        brush_shadow.setColorAt(0.0f, QColor(0, 0, 0));
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    else
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        brush_shadow.setColorAt(0.0f, QColor(0, 0, 0, 100));
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    QPen pen_shadow;
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    pen_shadow.setBrush(brush_shadow);
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    painter.setPen(pen_shadow);
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    painter.drawText(int(xShadow), int(yShadow), int(w), int(h), Qt::AlignLeft, this->text);
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    // draw text
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    QLinearGradient brush_text(0, 0, w, w);
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    brush_text.setSpread(QLinearGradient::PadSpread);
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    brush_text.setColorAt(0.0f, QColor(255, 255, 255));
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    brush_text.setColorAt(0.2f, QColor(255, 255, 255));
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    brush_text.setColorAt(0.5f, QColor(190, 190, 190));
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    QPen pen_text;
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    pen_text.setBrush(brush_text);
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    painter.setPen(pen_text);
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    painter.drawText(0, 0, int(w), int(h), Qt::AlignLeft, this->text);
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    return image;
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}
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void HeadingItem::animationStarted(int)
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{
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    this->noSubPixeling = false;
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}
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void HeadingItem::animationStopped(int)
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{
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    this->noSubPixeling = true;
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}