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January 14, 2013

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Qt: Save QPainter Output in an SVG or Image File

To save what you paint in a Qt window to a file (SVG or image) is an easy and straightforward piece of code. You create a QSvgGenerator or a QImage object. Some initialization. Paint into the object (treat it as an IODevice) And we are done. Suppose that this is what I draw in my paint event: void MainWindow::paintEvent(QPaintEvent *) { QPainter painter; painter.begin(this); painter.setRenderHint(QPainter::Antialiasing); paint(painter); painter.end(); } void MainWindow::paint(QPainter &painter) { painter.setClipRect(QRect(0, 0, 200, 200)); painter.setPen(Qt::NoPen); painter.fillRect(QRect(0, 0, 200, 200), Qt::gray); painter.setPen(QPen(Qt::white, 4, Qt::DashLine)); painter.drawLine(QLine(0, 35, 200, 35)); painter.drawLine(QLine(0, 165, 200, 165)); } If I want to save it into an SVG file, it would be something like this void MainWindow::saveSvg() { QString path = QFileDialog::getSaveFileName(this, tr("Save as SVG"),...

[Qt] Custom QListView delegate with word wrap

Using QListView with a custom item layout has been a very popular demand by many developers. The problem with using a custom delegate was having some basic features like word wrap depending on the allowed list size. Here is a screenshot from a project prototype I've been working on. The text will wrap around to fit in multiple lines depending on text length and list view width. My custom delegate is about using two important methods: QFontMetrics::boundingRect() and QPainter::drawText() . The first method will return the minimum Rect needed to draw the given text using the given origin and font. The second method draws the given text within the given Rect. Note that the flag Qt::TextWordWrap is given to both methods when called. The code is simple: Get system default font. Process the font to suite your needs. In my case: I have a normal font and another bold one for the header. Create a QFontMetrics instance for each font. Use the QFontMetrics instances to calculate the Rect n...

How to install Dhivehi / Thaana keyboard font on a MacBook Mac OS (December 2017)

A lot of Maldivian Mac users ask me about typing Thaana on a MacBook or iMac. Unfortunately Apple computers doesn't come with a Dhivehi/ Thaana keyboard like their counterpart Microsoft Windows operating system. I have always directed them to the YouTube video published by Nail Abdul Rahman ( @kudanai ) back in 2013. Here is a new post from Nail ( @kudanai ) on how to install Dhivehi, Thaana phonetic keyboard with Thaana fonts and Radheef (Dhivehi Dictionary) on a Mac operating system. Here is a step-by-step video on YouTube to make it easier for you guys. Installation 1- Open the Terminal app 2- Paste or type in the following command and hit enter bash <(curl -sL https://git.io/dhivehimac) Following up on the instructions posted on my Youtube video from 2013, I’ve tried to simplify the setup process even further. Follow this guide for current instructions on how to do this. If everything g...

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