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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