Picto: Model Visualisation via M2T Transformation
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Picto is a tool for generating and rendering views from EMF models in Graphviz, SVG and HTML, developed in the context of the Epsilon platform (eclipse.org/epsilon)
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Picto: Model Visualisation via M2T Transformation
- 1. Picto: Model Visualisation via M2T Transformation Dimitris Kolovos dimitris.kolovos@york.ac.uk
- 2. Textual vs. Graphical Syntax • Choice that needs to be made when implementing a DSL • Textual: Xtext, Spoofax, MPS • Graphical: Sirius, GMF/Eugenia, MetaEdit+ User -> ATM: Inserts card ATM --> User: Requests PIN User -> ATM: Provides PIN ATM -> Bank: Check PIN against card Bank --> ATM: Accepts PIN ATM --> User: Asks for type of transaction 25/11/2019 Enterprise Systems Seminars 2
- 3. Graphical Syntax +Taps into the power of the visual system • Visual representations processed in parallel +Essential for engagement with non- CS stakeholders - Only editable with a dedicated editor - Find, replace, copy, paste, comment out, version control not always straightforward 25/11/2019 Enterprise Systems Seminars 3 User -> ATM: Inserts card ATM --> User: Requests PIN User -> ATM: Provides PIN ATM -> Bank: Check PIN against card Bank --> ATM: Accepts PIN ATM --> User: Asks for type of transaction
- 4. 25/11/2019 Enterprise Systems Seminars 4
- 5. Textual Syntax +Editable with any text editor +Find, replace, copy, paste, comment out, version control practically solved - Text processed serially by the auditory system - Inaccessible to many non-CS stakeholders 25/11/2019 Enterprise Systems Seminars 5 User -> ATM: Inserts card ATM --> User: Requests PIN User -> ATM: Provides PIN ATM -> Bank: Check PIN against card Bank --> ATM: Accepts PIN ATM --> User: Asks for type of transaction
- 6. Textual vs. Graphical Syntax • Text better for editing • Once you are familiar with the DSL and in the zone • Even for languages which are traditionally graph-like (e.g. state machines) • Diagrams better for understanding and presenting models to a wider audience 25/11/2019 Enterprise Systems Seminars 6 User -> ATM: Inserts card ATM --> User: Requests PIN User -> ATM: Provides PIN ATM -> Bank: Check PIN against card Bank --> ATM: Accepts PIN ATM --> User: Asks for type of transaction
- 7. Multiple Syntaxes • Implement a graphical and a textual editor • Edit on both sides and keep in sync • Challenging in practice • Graphical/textual frameworks developed by different vendors • Lots of plumbing involved • A few prototypes but cutting many corners 25/11/2019 Enterprise Systems Seminars 7 User -> ATM: Inserts card ATM --> User: Requests PIN User -> ATM: Provides PIN ATM -> Bank: Check PIN against card Bank --> ATM: Accepts PIN ATM --> User: Asks for type of transaction
- 8. Graphical Views • Textual syntax for editing models • Generation of read- only graphical views • Challenges • Diagram layout • Fine-tuning (e.g. size, colour of elements/labels) 25/11/2019 Enterprise Systems Seminars 8 User -> ATM: Inserts card ATM --> User: Requests PIN User -> ATM: Provides PIN ATM -> Bank: Check PIN against card Bank --> ATM: Accepts PIN ATM --> User: Asks for type of transaction
- 9. Layout • Several decent options for automated graph layout e.g. • Graphviz • Eclipse Layout Kernel • DagreJS • Important that diagrams are kept reasonably small • But this is desirable anyway 25/11/2019 Enterprise Systems Seminars 9 User -> ATM: Inserts card ATM --> User: Requests PIN User -> ATM: Provides PIN ATM -> Bank: Check PIN against card Bank --> ATM: Accepts PIN ATM --> User: Asks for type of transaction
- 10. Fine-Tuning public static void main(String[] args){ System.out.println("Hello world"); } 25/11/2019 Enterprise Systems Seminars 10
- 11. Fine-Tuning public static void main(String[] args){ System.out.println("Helloworld"); } 25/11/2019 Enterprise Systems Seminars 11
- 12. Flexmi and Picto • Flexmi: XML-based syntax for EMF models • Reflective and fuzzy parsing • Instantiable model element templates • Presented in a previous ES Seminar • Picto: Framework for model view generation and rendering • EMF models (for now) • Views in Graphviz, SVG, HTML • Views generated using M2T transformations (in EGL) • Both tools in the latest interim version of Epsilon (eclipse.org/epsilon) 25/11/2019 Enterprise Systems Seminars 12
- 13. Live demo 25/11/2019 Enterprise Systems Seminars 13
- 14. Picto – Future Work • Layers • Declarative graphical syntax specification • Similar to Sirius/GMF/Eugenia • Navigation from view to model editor • Generation of views from multiple models • Integration with model validation • Change visualization • Web application 25/11/2019 Enterprise Systems Seminars 14
Notas del editor
- 1/3 of our brain is dedicated to processing visual input. Retyping is also a challenge.
- Won’t comment on scalability of graphical syntaxes: there are good ways to make graphical syntaxes scalable e.g. through the use of multiple diagrams.
- If you buy the argument that text is better for editing, two challenges remain.
- This doesn’t mean that your model should be small – but that each view you generate from it should be small. Actually, this diagram is auto-generated from the textual syntax above using a tool called PlantUML.
- Fine tuning is a matter of expectation.
- We would probably frown upon an IDE that allowed programmers to write code like this. Yes – fine-tuning would be nice to have but we have more important problems than that.
- UI polishing (e.g. custom icons, multiple Picto views/editors)