Language Selection

English French German Italian Portuguese Spanish

Marble's Secrets Part I: Behind the Scenes of Marble...

Filed under
Software

If you've ever followed KDE 4 development then you've probably heard about Marble. Marble is a virtual globe which displays the earth. So Marble can be used as a nice digital replacement for your desktop globe at home where you can look up places.

But wait! There's more to it: Actually these days Marble can also display flat maps (thanks to Carlos Licea), can show different "map themes" and can serve as a Qt4-widget as well as an application! This means that as a programmer you can use Marble in your very own project as a map widget (License: LGPL). Marble was designed to run on any device and on any operating system supported by Qt4 without any further requirements. You can download the latest version of Marble together with KDE 4.0.1 here (It's part of the KDE-EDU module).

How Marble stores texture data

If you start Marble you might realize that the startup time is pretty good: It usually takes maybe 2-5 secs to start Marble (and we are working on improving that dramatically). If you zoom into the earth you might notice that Marble doesn't get slower while zooming in. Looking at the amount of memory being used up you will also see that memory numbers don't change either. No matter how much you zoom in it's as little as 65-100MB which is pretty lean compared to other virtual globes.

Among other concepts this is being accomplished by loading the map piece by piece. Marble uses a concept that is very popular among virtual globes: Quadtiles. In fact we are using the most simple form of Quadtiles compared to other more sophisticated solutions. We decided to do so for reasons of pragmatism and in order to keep things easy to understand for people who want to contribute to Marble.

More Here




More in Tux Machines

The 9 best distros for KDE’s Plasma desktop

While it's possible to install 'KDE' software and Plasma desktop on most Linux based distributions, I have picked the distros which offer Plasma as their default desktop environment. These 'KDE-based' distros offer a better Plasma experience compared to those where you can 'also' install KDE. At some point in time I have used each of these distros as my primary OS except for Mageia and Open Mandriva, which I tried but never used due to uncertainty around their future. Read more

Snag the Android Auto compatible Pioneer AVH-4100NEX for just $570 from Amazon

While the unit carries an MSRP of $700, Amazon's deal marks it down from its previous list price of $849.99. While it's still a tad expensive, the discount makes it a bit easier to get some Android Auto into your car. In case you've somehow managed to avoid any mention of Android Auto up until now, it allows you to connect any Android device running on Android 5.0 Lollipop with the relatively new Android Auto app in order to use it to control everything from navigation to music and phone calls. Read more

A Data-Driven Look at the Open Source E-Commerce Market

Compared to Q4 2013, last quarter’s US online sales rose 14.6 percent to a staggering $79.6 billion dollars. This accounted for 6.7 percent of the total US retail sales market. Major trends fueling this growth include the proliferation of mobile devices, faster online checkout flows and improved fulfillment practices. The availability of open source e-commerce platforms is helping some offline business with the move online. Much like WordPress provides free, customizable CMS solutions, popular open source e-commerce platforms like WooCommerce, Magento and PrestaShop offer a variety of pre-built templates and plugins that DIY retailers can customize to build and grow an online business from scratch. Read more

Tiny WiFi-loaded OpenWRT COM starts at $12

OpenEmbed launched a 52 x 28mm “SOM9331″ COM for IoT that runs OpenWRT Linux on a MIPS-based Atheros AR9331 SoC, and offers WiFi and extended temperatures. Shenzhen OpenEmbed M&C Ltd (OpenEmbed) has introduced a tiny MIPS-based computer-on-module starting at $12 and aimed at home automation, wearables, medical devices, toys, and industrial router and sensor devices. Read more