Chapter 3: Scripting Props and Acts

In addition to a room having a script associated with it, props and actors can also have scripts.  If you have a lot of actors and props in a room, all doing different things, it is much easier to associated the scripting logic for a particular actor with that actor instead of in the room’s script.

Adding a shadow of the ego

For this exercise, we’ll make a Prop that acts as the shadow of the ego.  The Prop’s script’s doit method will check the ego’s position, and adjust its own position accordingly.

Example:

(instance aShadow of Prop

    (properties

        x 0

        y 0

        view 800

    )

    (method (init)

        (super:init())

        (self:ignoreActors() z(-90))

        (self:setScript(shadowScript))

    )

)

 

(instance shadowScript of Script

    (properties)

    (method (doit)

        (aShadow:

            posn((+ 20 (send gEgo:x)) (- (send gEgo:y) 90))

        )

        (super:doit())

    )

)

And then, in the init method of the room, you do

For example:

        (aShadow:init())

 

It’s that easy.  Of course, the prop or actor’s script can contain any of the standard script methods: changeState, handleEvent or doit.


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