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1. #TUTORIAL MYDRAW PROGRAM HOW TO#
2. #TUTORIAL MYDRAW PROGRAM GENERATOR#
3. #TUTORIAL MYDRAW PROGRAM CODE#
4. #TUTORIAL MYDRAW PROGRAM FREE#

We'll need only a few concepts:Ĭanvas - to define the top-most node representing the whole Painting definition and holding all Shapes Our language is going to be pretty straightforward. Nodes are instances of Concepts giving concrete values to properties, children and references of their Concepts Programs (solutions) consist of ASTs, which consist of Nodes Concepts define properties, children and references and Nodes then give the concrete values.Ĭoncepts define the logical (abstract) elements with their properties, children and references The AST of the short program above shows the abstract syntax - it consists of Nodes, each Node is an instance of a Concept that the language defines. A program then consists of Abstract Syntax Trees, which hold instances of these Concepts. Concepts define the abstract syntax of a language, that is the set of allowed language logical constructs. Our language needs to cover each such command with a Concept. The language that we're building must allow for painting definitions, which consist of individual commands, each on a separate line and each defining a single shape to draw.

#TUTORIAL MYDRAW PROGRAM CODE#

This is a piece of code that you will be able to create once you implement the Shapes language fully. Languages and programs under the hoodįirst, here's a bit of background knowledge that you should know before going on.

#TUTORIAL MYDRAW PROGRAM HOW TO#

We will learn later how to rebuild a project, but clicking on the "Rebuild and deploy listed languages" link in the error dialog will work just fine. some migrations might be needed to be run), you have to rebuild the project to make the error go away. If MPS shows you an error message at this stage complaining about the project not being in proper state (e.g. In our tutorial will first define a language and than use it to write code that we can execute. To write these programs, you use languages, either defined in the same project or imported ones. You'll get an empty project containing an empty Language Definition and an empty Solution.

On the welcome screen you click Create New Project and then follow the wizard. You'll be able to pass easily, you'll see. We assumed this possibility and made the tutorial to guide you carefully. If you are not versed in Java or Swing, do not worry too much too early.

#TUTORIAL MYDRAW PROGRAM GENERATOR#

You automate the work of a UI programmer by providing a language and a generator that cover some of the cases that a UI programmer currently has to solve manually. You, on the other hand, will play the role of a language designer, who will prepare such an easy-to-use language building on his or her knowledge of Java. The language could enable non-programmers to build Java applications without any knowledge of Java, Swing or the 2D Graphics API. The definition will be then translated into a Java Swing application, which will visualize the layout on the screen. The language will allow its users to lay out visual two-dimensional shapes on a flat canvas. You're going to implement a sample language for specifying graphical shapes. (BTW, the sample also contains additional features explained in the Building an interpreter cookbook, which you can have some fun with later.) Goal Try to avoid copy-pasting, though, since you wouldn't learn much that way.

#TUTORIAL MYDRAW PROGRAM FREE#

If you get stuck at any moment, feel free to open it from your home folder/MPSSamples in MPS and look at the implementation. The result of this tutorial has been bundled as a sample project with MPS distributions. We also assume you've installed MPS and you have it running in front of you. Tab - to navigate around editable elements in the editor Especially these keyboard shortcuts are key to your survival:Ĭtrl+Space - to complete an incomplete word or to turn an invalid (red) identifier into a correct (black) oneĪlt+Enter - to display a menu with handy options applicable at the current editor positionĬtrl+Up - Expand the region of selected textĬtrl+Down - Shrink the region of selected text If not, consider spending the first 30 minutes or so of your time to check it out. We'll assume you've gone through the initial parts of the Fast Track to MPS Tutorial and so are familiar with the MPS environment, understand the concept of a language and a solution and can command the MPS projectional editor. You may also watch this tutorial on-line as a screen-cast. At the end you'll know what MPS is all about and what principles it builds on. We'll avoid advanced concepts, complicated constructs and dark corners in order to get to the finish line quickly. In the tutorial you'll start from scratch and by walking along a safe and a convenient path you'll design the core elements of a new language. Within two hours you'll get a new language and functional code that uses that language. If you're new to MPS and want to try it out quickly, this is the right tutorial for you.