In the image above you can see a list of available operators and expressions: click to add one. You can also add properties in one of the two lists: click on **//Add//**, and fill out the parameters if necessary.
An expression is a mathematical calculation. It can be composed of numbers (e.g. 42), operators (e.g. 42 + 5), or functions (e.g. the random function: Random(5)).
A function is invoked by writing its name followed by parentheses. Parentheses optionally contain parameters to be sent to the function (e.g. Random(5)).
In order to invoke the function of an object, use the object name followed by a dot before the function (e.g. MyObject.X()).
will give 1, 5 or 7 as result.
Random(x) will give a random number between 0 and x.