As some you already noticed, I have recently pushed a new branch, called qalculate-backend, into the Cantor git repository. The backend was originally created by Milian Wolff and recently I have also been working on it. The main functionality of the backend is already implemented, as you can see from the screenshot below.

• Are you particularly satisfied with the figure you just created with Cirkuit? You can now share it with the community via the built-in GHNS support. You can also download the diagrams shared by other users.

  

• The keyboard shortcuts and toolbar are now fully configurable, so you can now redefine the shortcuts to generate the preview, export it and so on.
• Especially interesting for developers, a new backend system (similar to the one used in Cantor) has been implemented. This means that it’s fairly easy to generate a new backend and add it to Cirkuit. As an example. a new PSTricks backend has been created and added in this release.
• The help system has been also improved, providing the correct documentation for the currently used backend (if the backend supports it)

a major update of Cirkuit is approaching with a lot of bug fixes/improvements on existing features and of course a whole bunch of new features.

Improvements:

• a much improved preview widget with variable zoom levels
• manuals and examples of each backend can be accessed in the main interface
• improved multi-threading -> Cirkuit generates the previews faster
• improved parsing of log files and error handling
• increased usage of K* instead of Q* classes for a better integration with the KDE environment
• redesigned configuration dialog

New features:

• a new backend system (heavily inspired by Cantor) which will make it much easier to write new plugins for your favorite graphic tools
• new template system with GHNS (Get Hot New Stuff) support
• you can now share your figures with the rest of the community via GHNS (the idea would be to create something along the lines of Tikzexamples)
• configurable keyboard shortcuts and toolbars

Just a screenshot to show off a new feature:

In the coming days/weeks I’ll add new posts to explain the new functionality in detail. In the meantime, you can compile latest master from git.kde.org and try the new features yourself. For any bug/wish, please use http://bugs.kde.org. Stay tuned!

• Added possibility to export to TeX source
• Can export to GIF
• Fixed a bug that caused wrong syntax highlighting detection in Kate
• Correct escaping of mathematical expressions in the Gnuplot backend
• Fixed a bug that prevented the user to overwrite an exported file even when the user has confirmed that he wants to overwrite it
• Fixed compilation issues
• Improved localization
• Various minor bugfixes

Additionally, the migration of Cirkuit to the KDE infrastructure is now completed. This means you can now find the code at projects.kde.org/cirkuit, you can submit bugs and feature requests to bugs.kde.org, and you can use reviewboard.kde.org to propose patches. From now on please use these tools, so that bugs, patches and feature requests do not get lost in comments or mails. Thanks to the KDE sysadmins for the great job!

in this post I would like to introduce another project I have been working on lately: Cirkuit. It was born as a KDE interface to Circuit macros (hence the name), a great set of macros that can be used to produce high-quality diagrams typically (but not limited) for inclusion in a TeX/LaTeX document. The main purpose of Cirkuit was then to provide a “live preview” of Circuit macros code and to export the result in various formats (PDF, EPS, SVG, PNG, JPEG).

However, since I used also other graphical tools to produce graphics for my publications/presentations, I wanted to add support for other “backends” in addition to Circuit macros. At the moment, there are two additional working backends: TikZ/PGF and Gnuplot. So, it is now possible to write TikZ and Gnuplot code and get a preview of the result. The interface in based on the Kate part and so it also supports syntax highlighting. Here are a couple of screenshots:

Notice the use of LaTeX in both the examples to nicely format the legends/symbols.

Cirkuit just moved to git.kde.org (thanks to the sysadmin team). If you are interested in it and want to check out/contribute code, visit the project page.

since this is my first post on the Planet, I’ll shortly introduce myself and my activities in KDE. My name is Matteo and I am the maintainer of the Qalculate plasmoid and runner since SC 4.5. I am also the founder and maintainer of Cirkuit, a KDE app to produce publication-ready graphics using different backends (TikZ, Circuit Macros, Gnuplot).

In this post, I would like to describe some features that have been introduced in SC 4.5 (and polished for SC 4.6) in the Calculator runner. The reason for this post is that apparently many people are not familiar with many of the features offered by the Calculator runner since 4.5.

First of all, how do you use the runner? Simply press ALT+F2 and type a mathematical expression with a ‘=’ sign at the beginning or at the end of the statement, as shown in the figure below.

Since KDE SC 4.5, the calculator runner has an optional (compile-time) dependency on libqalculate. So, if you compiled kdebase with libqalculate support enabled, the runner has some “advanced” features, like unit conversion, exchange rates, equation solving, and many more.

This means that you can perform calculations involving Newton’s laws of motion or Ohm’s law just by pressing ALT+F2 and typing the expression (see pictures below).

You can’t remember the derivative or integral of a certain function? This can also be accomplished by the runner:

You can also solve equations:

You can find out additional features at the Qalculate website. I will write an additional post about the Qalculate plasmoid, illustrating more features of the Qalculate engine. Feel free to suggest improvements in the comments.