68537.5 / 27 January 2015

Something funny & something useful

I was working on something and I noticed something really funny in the Qt documentation. Have a look.... funny or go to http://doc.qt.io/qt-5/qscrollarea.html If this isn't prime material for a programmers meme I don't know what is. I have no idea why they inserted this picture as the example other then to have a good time with the material they decided/or had to write. Very funny either way. Thanks for the unexpected laugh Qt document writers. I was reading the documentation because I needed to create my own version of a photo editing area. I even posted an adapted example on stackoverflow here : http://stackoverflow.com/a/28147336/1325621

If it is not completely obvious this little snippet helps you align your QImage inside a widget.

void ImageView::paintEvent(QPaintEvent*) { if (this->imageBuffer.empty()){ return; } double widgetWidth = this->width(); double widgetHeight = this->height(); QRectF target(0, 0, widgetWidth, widgetHeight); QImage tempQImage = *this->imageBuffer.at(this->imageBuffer.count()-1); tempQImage = tempQImage.scaled(rect().size(), Qt::KeepAspectRatio, Qt::SmoothTransformation); double imageSizeWidth = static_cast(tempQImage.width()); double imageSizeHeight = static_cast(tempQImage.height()); QRectF source(0.0, 0.0, imageSizeWidth, imageSizeHeight); int deltaX = 0; int deltaY = 0; if(source.width() < target.width()) deltaX = target.width() - source.width(); else deltaX = source.width() - target.width(); if(source.height() < target.height()) deltaY = target.height() - source.height(); else deltaY = source.height() - target.height(); QPainter painter(this); painter.translate(deltaX / 2, deltaY / 2); painter.drawImage(source, tempQImage); }

This isn't the final version, but it definitely gives some one a good starting point. If anyone is interested in an updated version with more features let me know.

Something funny & something useful

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