Abstract: It is easier and easier to create a proper QtQuick application from scratch. But is it really that simple to bring existing code in the QtQuick structure? It can get especially challenging for a large project which collected C++ collected over more than 15 years. What can we do of all that code? Temptation […]

Abstract: Qt5 introduces better support for OpenGL from the QPA/Lighthouse abstraction, through a new set of OpenGL classes up to QtQuick 2 and Qt3D. OpenGL is also very often used for games and as the central content widget in desktop applications. With the advent of QtQuick 2 it is now easy to write entire user […]

Abstract: “QtQuick in Qt5 uses OpenGL to deliver fluid, performant visuals, and an internal scene-graph structure to permit threaded rendering, decoupling the main application thread from interacting directly with the graphics driver. For developers work with an existing rendering or visualisation technology, this presents both an opportunity but also problems; QtQuick offers a compelling, modern […]

QML is the language that makes writing Qt application UIs easier than ever before. QmlWeb now brings this ease to the web. Traditionally desktop applications were written in languages like C or C++. Web technologies like HTML and PHP were mainly used to write static websites. With the rise of modern web applications and technologies […]

Qt on Android Tutorial (please adjust volume / low sound): Abstract: The tutorial will start with instructions on how to setup the development environment, how to configure QtCreator and ensuring that all dependencies are met. It will then continue with a live demonstration on creating an app, deploying it to an Android device and debugging […]

http://www.kdab.com/wp-content/uploads/stories/photon_migration.mp4 The Photon to Qt migration framework helps you control the complexity and cost of the migration project. The framework consists of the following parts: a partial implementation of the Photon API in Qt, covering the most important use cases a library of Qt widgets as slot-in replacements for Photon widgets that do not exist […]

Last week I visited a new customer who is making medical and industrial devices which have one thing in common: image and video capturing, and letting the user save these files onto a USB key. These devices run embedded Linux and the application is done in Qt (and gstreamer for the video capture). The new […]

So far we talked about the technical aspects of scaling your application, the dpi, the number of pixels, its nature, the nature of image formats and the implications of all that on the creation of visual elements for your UI. But this is only a part of the problem, for although all this helps you […]

AKA: I know what you did last Christmas ! Hello folks, I'd like to share with you a few things that I did during this Xmas. Besides the fact I'll never ever take a vacation before Xmas, because Brasov is a tourist attraction and it was FULL of tourists in that period. I could ski […]

Continuing our blog post series about the rewrite of Qt3D. One of the biggest driving factors behind the design of Qt3D 2.0 is the ability to configure the renderer in order to accommodate custom rendering techniques. In this blog post I will explain how to render a scene in Qt3D with shadows. The complete working […]

Update: Here you have also the Chinese version, thanks goes to Foruok. After we've seen how to set up the development environment, how to use Qt on Android and what deployment systems are available and how to sign the final package, it's time to move forward. In this article we are going to learn about […]

One type of bug I see very often comes down to syntax errors in QML and JavaScript files. Most of the time these errors are simple typos; however, they creep in, go unnoticed by continuous integration and sometimes reach production -- especially on delayed loaded components. I like fixing bugs, but what I love even […]

Touchscreens and modern user interfaces are migrating into every type of medical machine: ultrasound, infusion, CAT, MRI, x-ray, care monitors, surgery displays, information tablets, and even patient self-service systems. Touchscreens are also helping with hygiene requirements as they are liquid-proof and easily disinfected because the display is in a sealed enclosure. Qt is an ideal […]

The Challenge Previously on this blog, we featured a series of articles about our QML-based presentation tool, SlideViewer. To quickly recap: SlideViewer is a presentation program that allows writing slides entirely in QML. There are situations in which the slide deck needs to be available in PDF format in addition to the QML source: For […]

Vectors. Moving away from my original plan, today we will be talking about Vectors. To start this series of posts I had a main motivator, SVG. It is a great file format, it's the file type I use day in day out and the format I use the most to create all of my images... […]

A couple of months ago, Jesper Pedersen introduced our presentation tool for trainings, called SlideViewer. As SlideViewer is mainly used for our Qt and Squish trainings, we naturally have many code examples on the slides, ranging from C++ and QML to Python and XML. In this blog post, we will take a closer look at […]

Several previous posts have introduced our SlideViewer tool which we created for use in the various trainings we deliver. The tool started out as an experiment, created using basic QtQuick 2 Items. Startup configuration was specified by command line arguments, and a simple Keys.onPressed function provided most of the runtime control: both navigating around the […]

This is a typical situation when you program a GUI for an application. You have just created a new control, you start your application and... no control. But now: Is it obscured? Is it misplaced? Is it completely transparent or set to 'invisible'? Is my custom OpenGL-stuff broken or is the item actually not created […]

In the previous blog post, we talked about the importance of pixels and their indivisible nature, the way we deal with that in the icon area and introduced the concept of PPI dependable UIs - all this to have truly scalable graphics in QML. We used the BorderImage element to illustrate how an element could […]

Introduction Following on from the previous articles on SlideViewer, we shall now investigate another piece of the puzzle towards making SlideViewer usable in practise. Namely, getting the content rendered from our domain specific language and on to the screen or projector for the audience to marvel at. Those of you that have ever presented at […]