Visual modeling languages are often used today in engineering domains, Mathworks? Simulink/Stateflow for simulation, signal processing and controls being the prime example. However, they are also becoming suitable for implementing other computational tasks, like model transformations. In this paper we briefly introduce GReAT: a visual language with simple, yet powerful semantics for implementing transformations on attributed, typed hypergraphs with the help of explicitly sequenced graph transformation rules. The main contribution of the paper is a Simulink/Stateflow code generator that generates executable code (running on a distributed platform) from the visual input models. The paper provides an overview of the algorithms used and their realization in GReAT.