CoCoViLa - a compiler compiler for visual languages.

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To open a package, choose "Load" from the "Package" menu (for example packages/logic/logic.xml). In addition to the three default tools (the selection tool, the tool for adding relations and magnifier), the package specific tools (icons) are added to the palette when a package is loaded.
Click on an object icon. The editor goes into "insert a new object mode". Move the mouse to
where you want to place the object, a mouseclick places the object in that position.

 

To add relations between objects, press the relation tool button

Click on a port of an object, move your mouse over another port and click again. A relation is established between the two ports. To see the actions that can be invoked on an object, right-click on the object. Choose "Properties" to view, change or add values of the object attributes.

 

When a scheme is ready,

 choose "Specification" from the "Scheme" menu. You see the textual specification of the scheme. The specification can be edited further in the window. Press "Compute all" to invoke the planning strategy that generates a program which computes everything tha can be computed based on the scheme.

The program window will then show the Java program that has been generated. Press "Compile & Run" to compile it and then invoke.

The "Propagate values" button sends the computed results back to scheme (see object properties to view them). The invoke button invokes the program, and also updates the scheme to show the change (if any have been made). For example, for the scheme shown in the window below, it will show how values keep changing in the scheme, since the value generator (the object in the top left) keeps alternating the values it outputs, and delayer (the object in the bottom left) delays them for one tick.