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  • Shapes - an introductory MPS tutorial

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An editor is also needed:

Pre-defined colors

Now, rebuild your project. The Color concept that we have just added needs to be compiled, so that we can use it to create some colors. We need to provide concrete nodes of the Color concept, which will represent the individual color constants and which the user of our language will be able to refer to from their Canvasses. We will utilize Accessory models for this. Accessory models are models inside a language definition that hold arbitrary nodes, which become part of the language and are visible to the language users.

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Now you should be able to create color constants in the newly created accessory model:

If you do not see Color in the New menu, you most likely forgot to rebuild the language. Or, you have missed the can be root property of the Color concept, which has to be set to true.

The first touch on dependencies

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