Script Classes for Adventure Games/Cycling Classes

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The Cycling Classes

Author: Jeff Stephenson

Date: 5 April 1988

 


The Cycling Classes

The Cycle class is the basic class which implements cycling behavior in Actor and its sub-classes. Sub-classes of Cycle implement specific cycling behavior.


Cycle

In file: motion.sc
Inherits from: Code
Inherited by: Forward
Reverse
CycleTo


Properties


caller
The object to be cue:ed when the Cycle completes.

client
The Prop, Actor, etc. which is being cycled by an instance of Cycle.

cycleDir
The direction in which the client's cels are to be cycled.
1 forward (cel numbers should increase)
-1 backward (cel numbers should decrease)

cycleCnt
The number of animation cycles since the current cel of the client was displayed. When this equals the cycleSpeed of the client, the nextCel: method is invoked.


Methods


init:
Do any necessary initialization of the Cycle class and ensure that the client is updating.

doit:
Called by the client as doit: self, this method sets the cel of the client to the appropriate value based on the particular Cycle class.

nextCel:
Used by the doit: method to move the cel number in the direction indicated by cycleDir.

cycleDone:
This is invoked when the client's cel reaches a destination cel. If the Cycle class is one of the cyclic ones, this just wraps the cel to either the beginning or end of the current loop. If it is a terminating Cycle class, this cue:s the caller.


Forward

Cycles an Actor through its cels in the 'normal' order — from 0 through the end of the loop and back to 0. Set with (actor setCycle:Forward).

In file: motion.sc
Inherits from: Cycle
Inherited by: Walk


Walk

This is a Forward cycle type which only cycles an Actor when the Actor is moving. Set with (actor setCycle:Walk).

In file: motion.sc
Inherits from: Forward
Inherited by: none


Reverse

Cycles an Actor through its cels in the reverse order of that in Forward, i.e. from the highest cel number to 0 and then repeating. Set with (actor setCycle:Reverse).

In file: motion.sc
Inherits from: Cycle
Inherited by: none


CycleTo

This class allows you to cycle to an arbitrary cel and stop. It is set by (actor setCycle:CycleTo toCel direction [caller]).

In file: motion.sc
Inherits from: Cycle
Inherited by: EndLoop
BegLoop


Properties


endCel
The number of the cel at which the cycling is to complete.


EndLoop

This sub-class of CycleTo advances the cel of an Actor from the current cel to the cel which is the end of the current loop for the Actor, then stops and cue:s its caller (if it has one). Set with (actor setCycle:EndLoop [caller]).

In file: motion.sc
Inherits from: CycleTo
Inherited by: none


BegLoop

This sub-class of CycleTo decrements the cel number from its current value to 0, then stops and cue:s its caller, if any. Set with (actor setCycle:BegLoop [caller]).

In file: motion.sc
Inherits from: CycleTo
Inherited by: none

 

Notes


 

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