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
Code:

(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:
Code:

(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.

< Previous: Chapter 2 - Regions and Locales Next: Chapter 4 - Loopers >

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