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Diffstat (limited to 'demos/qtdemo/imageitem.cpp')
-rw-r--r-- | demos/qtdemo/imageitem.cpp | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/demos/qtdemo/imageitem.cpp b/demos/qtdemo/imageitem.cpp new file mode 100644 index 0000000..e556011 --- /dev/null +++ b/demos/qtdemo/imageitem.cpp @@ -0,0 +1,114 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the demonstration applications of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** 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 +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** 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 +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "imageitem.h" +#include "colors.h" + +ImageItem::ImageItem(const QImage &image, int maxWidth, int maxHeight, QGraphicsScene *scene, + QGraphicsItem *parent, bool adjustSize, float scale) : DemoItem(scene, parent) +{ + this->image = image; + this->maxWidth = maxWidth; + this->maxHeight = maxHeight; + this->adjustSize = adjustSize; + this->scale = scale; +} + +QImage *ImageItem::createImage(const QMatrix &matrix) const +{ + QImage *original = new QImage(image); + if (original->isNull()){ + return original; // nothing we can do about it... + } + + QPoint size = matrix.map(QPoint(this->maxWidth, this->maxHeight)); + float w = size.x(); // x, y is the used as width, height + float h = size.y(); + + // Optimization: if image is smaller than maximum allowed size, just return the loaded image + if (original->size().height() <= h && original->size().width() <= w && !this->adjustSize && this->scale == 1) + return original; + + // Calculate what the size of the final image will be: + w = qMin(w, float(original->size().width()) * this->scale); + h = qMin(h, float(original->size().height()) * this->scale); + + float adjustx = 1.0f; + float adjusty = 1.0f; + if (this->adjustSize){ + adjustx = qMin(matrix.m11(), matrix.m22()); + adjusty = matrix.m22() < adjustx ? adjustx : matrix.m22(); + w *= adjustx; + h *= adjusty; + } + + // Create a new image with correct size, and draw original on it + QImage *image = new QImage(int(w+2), int(h+2), QImage::Format_ARGB32_Premultiplied); + image->fill(QColor(0, 0, 0, 0).rgba()); + QPainter painter(image); + painter.setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform); + if (this->adjustSize) + painter.scale(adjustx, adjusty); + if (this->scale != 1) + painter.scale(this->scale, this->scale); + painter.drawImage(0, 0, *original); + + if (!this->adjustSize){ + // Blur out edges + int blur = 30; + if (h < original->height()){ + QLinearGradient brush1(0, h - blur, 0, h); + brush1.setSpread(QGradient::PadSpread); + brush1.setColorAt(0.0, QColor(0, 0, 0, 0)); + brush1.setColorAt(1.0, Colors::sceneBg1); + painter.fillRect(0, int(h) - blur, original->width(), int(h), brush1); + } + if (w < original->width()){ + QLinearGradient brush2(w - blur, 0, w, 0); + brush2.setSpread(QGradient::PadSpread); + brush2.setColorAt(0.0, QColor(0, 0, 0, 0)); + brush2.setColorAt(1.0, Colors::sceneBg1); + painter.fillRect(int(w) - blur, 0, int(w), original->height(), brush2); + } + } + delete original; + return image; +} |