Scripting Props and Acts

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:

<syntaxhighlight lang="sci" class="cs"> (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()) ) )</syntaxhighlight>

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

For example:

Code:

<syntaxhighlight lang="sci" class="cs"> (aShadow:init())</syntaxhighlight>

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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