DRAKON is a visual language for specifications from the Russian space program. DRAKON is used for capturing requirements and building software that controls spacecraft.

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The rules of DRAKON are optimized to ensure easy understanding by human beings.

DRAKON is gaining popularity in other areas beyond software, such as medical textbooks. The purpose of DRAKON is to represent any knowledge that explains how to accomplish a goal.

DrakonHub

Create DRAKON flowcharts directly in your browser. No installation required.
See drakonhub.com.

Drakon.Tech

An online IDE for JavaScript based on DRAKON
See drakon.tech.

DRAKON Editor for Desktop

DRAKON Editor is a free tool for authoring DRAKON flowcharts. It also supports sequence diagrams, entity-relationship and class diagrams.

With DRAKON Editor, you can quickly draw diagrams for:

software requirements and specifications;
documenting existing software systems;
business processes;
procedures and rules;
any other information that tells 'how to do something'.

DRAKON Editor runs on Windows, Mac and Linux.

The user interface of DRAKON Editor is extremely simple and straightforward.

Software developers can build real programs with DRAKON Editor. Source code can be generated in several programming languages, including Java, Processing.org, D, C#, C/C++ (with Qt support), Python, Tcl, Javascript, Lua, Erlang, AutoHotkey and Verilog

News

7 September 2018: DRAKON Editor 1.31 is out

State machine methods can now return values!
State machines were added to the Python code generator. Now finite automata are supported for C, Erlang, C#, Python, JavaScript, and Lua.
C# state machines were rewritten and improved. This is a breaking change. The new code generator does not produce backward-compatible code. The new C# machines support both static and dynamic method dispatch.
A small incompatible change for Lua machines. To create a machine, call some_machine() instead of make_some_machine().

1 August 2018: DRAKON Editor 1.30 is out

Removed 'this' keyword from state machine methods in JavaScript. No need to have a machine's reference to call its methods as delegates.
Added 'state machine' to the available diagram types in the Create diagram dialog.

25 July 2018: An animated online demo of state machines in DRAKON

DRAKON Editor provides support for automata-based programming. You can draw state machines using the DRAKON language.Unlike the traditional state charts, DRAKON diagrams combine a state machine with decision trees.See how to do that in this animated demo.

3 December 2017: DRAKON Editor 1.29 is out

Cleaner state machines for Lua and JavaScript.
The encoding of output files is UTF-8.
Language selection from menu: File > Global settings > Language
UTOPIST tasks in JavaScript code generator.
Added a generator for nools rules engine.
DrakonLua and DrakonJs, subsets of Lua and JavaScript with a cleaner and unified syntax.
Fixed bug with insertion of parallel paths.
Added -folder -ext options to drakon_gen.

10 March 2016: DRAKON Editor 1.27 is out

Go language support.
Nice foreach code generation for Java, C#, Python, Tcl, Lua, D.
Better boolean short-circuit detection.
C/C++ code generator does not generate redundant return statements anymore.
Erlang generator does not emit throw when no default clause is present in a select statement.
JavaScript code generator: different foreach for objects and arrays.
Stricter handling of select keyword inside select icon.

7 November 2015: DRAKON Editor for Web

DRAKON Editor Web is now available.
http://drakonhub.com

11 June 2015: A talk on DRAKON-Erlang at Erlang User Conference in Stockholm

The slides: drakon-erlang-slides.zip
The diagrams and source code: drakon-erlang-src.zip

1 June 2015: DRAKON Editor 1.26 is out

Massive improvements to the Erlang code generator: receive statement, select/case macroicon produces 'case X of' statement, visual supervision tree.
A bug fixed in the JavaScript code generator.
Added a warning before export to PNG.

29 December 2014: DRAKON, Actors and Message Passing

The goal is to see how practical DRAKON is in the context of actors, state machines and message passing.

What has been done:

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A simple actor framework has been developed in C#.
The C# code generator for DRAKON Editor has been extended to emit code for actors.
Two sample applications were built using the runtime and the code generator. The sample applications show off concurrency based on actors and message passing.

Each actor in the applications is a DRAKON diagram. Read more..

Get the source code on GitHub

18 December 2014: DRAKON Editor 1.25 is out

Syntaxhighlighting!
Improvements to the C# code generator for state machines.

29 November 2014: DRAKON Editor 1.24 is out

Setting zoom for all diagrams simultaneously.
Bug fixes, including a problem with Mac shortcuts, AutoHotkey code generator etc.

21 September 2014: DRAKON Editor 1.23 is out

What's new:

Code generation for the AutoHotkey language.
Code generation for the Verilog language.
Code generation for state machines (finite automata) in Lua and JavaScript.
Improvements in the JavaScript generator: better iteration, support for method functions and 'closure' namespaces.
State machines and ERIL support in the code generator for the C language.
More flexibility added to 'Select-Case' icons. It is now possible to put any condition in a 'Case' icon, not just a value.
Other small improvements in code generation for several languages.
Bug fixes.
Switch to Tcl/Tk 8.6. It's a major change in system requirements. DRAKON Editor now needs Tcl/Tk 8.6 to run. Tcl/Tk 8.5 is not supported any more.

Please see the examples in the examples/automaton folder inside DRAKON Editor's zip file. Xtreme volleyball 3 download game free. There you can find small programs based on finite automata represented in DRAKON.

8 February 2014. Tutorial: how to add a language to DRAKON Editor

This tutorial explains how to add an arbitrary language to DRAKON Editor.

Code generation in DRAKON Editor is implemented with plugins. Creating a code generator for yet another programming languages can be done by adding a plugin.The tutorial takes the D language as an example.Read more..

As a bonus, DRAKON Editor now supports code generation for the D language!

2 February 2014: DRAKON Editor 1.22 is out

A bug fix related to inline comment icons in Erlang diagrams.
The content of the 'if' icon in Erlang is not limited to the guard syntax any more (patch by Maas-Maarten Zeeman).
State machine (finite automata) support for Erlang code generation.Read more and see the examples/automaton/Erlang

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