Script Classes for Adventure Games/Object Class - Revision history

Andrew Branscom: /* See Also: */

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	* [[:Category:SCI Scripting\|SCI Scripting]]		* [[:Category:SCI Scripting\|SCI Scripting]]
	* [[:Category:SCI Classes\|SCI]]		* [[:Category:SCI Classes\|SCI Classes]]
	* [[:Category:SCI Object Class \|SCI Object Class]]		* [[:Category:SCI Object Class \|SCI Object Class]]
	* [[:Category:SCI Objects\|SCI Objects]]		* [[:Category:SCI Objects\|SCI Objects]]
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Andrew Branscom: /* See Also: */

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	* [[:Category:SCI Object Class \|SCI Object Class]]		* [[:Category:SCI Object Class \|SCI Object Class]]
	* [[:Category:SCI Objects\|SCI Objects]]		* [[:Category:SCI Objects\|SCI Objects]]
	* [[:Category:SCI Object Class \|SCI Object Class]]

Andrew Branscom: /* See Also: */

2026-01-05T23:18:34Z

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	==<br /> See Also: ==		==<br /> See Also: ==

	* [[SCI Specifications]]
	* [[:Category:SCI Documentation\|SCI Documentation]]		* [[:Category:SCI Documentation\|SCI Documentation]]
	* [[:Category:Official SCI Documentation\|Official SCI Documentation]]		* [[:Category:Official SCI Documentation\|Official SCI Documentation]]
	* [[:Category:SCI Scripting\|SCI Scripting]]		* [[:Category:SCI Scripting\|SCI Scripting]]
	* [[:Category:SCI Classes\|SCI]]		* [[:Category:SCI Classes\|SCI]]
	* [[:Category:Objects\|Objects]]		* [[:Category:SCI Object Class \|SCI Object Class]]
	* [[SCI ~~Specifications~~]]		* [[:Category:SCI Objects\|SCI Objects]]
			* [[:Category:SCI Object Class \|SCI Object Class]]


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Andrew Branscom: /* See Also: */

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	* [[SCI Specifications]]		* [[SCI Specifications]]


	[[Official SCI Documentation]]<br />		[[Official SCI Documentation]]<br />
	[[Script Classes for Adventure Games \| Table of Contents]]		[[Script Classes for Adventure Games \| Table of Contents]]

Andrew Branscom: /* See Also: */

2026-01-05T23:01:04Z

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	* [[[SCI Specifications]]		* [[SCI Specifications]]
	* [[:Category:SCI Documentation\|SCI Documentation]]		* [[:Category:SCI Documentation\|SCI Documentation]]
	* [[:Category:Official SCI Documentation\|Official SCI Documentation]]		* [[:Category:Official SCI Documentation\|Official SCI Documentation]]

Andrew Branscom at 22:59, 5 January 2026

2026-01-05T22:59:55Z

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	==<br /> References ==		==<br /> References ==

	<references />		<references /><!-- Do not edit this section. It is autopopulated by <ref></ref> tags -->

	==<br /> See Also: ==		==<br /> See Also: ==

			* [[[SCI Specifications]]
			* [[:Category:SCI Documentation\|SCI Documentation]]
			* [[:Category:Official SCI Documentation\|Official SCI Documentation]]
			* [[:Category:SCI Scripting\|SCI Scripting]]
			* [[:Category:SCI Classes\|SCI]]
			* [[:Category:Objects\|Objects]]
	* [[SCI Specifications]]		* [[SCI Specifications]]


			[[Official SCI Documentation]]<br />
	[[Script Classes for Adventure Games \| Table of Contents]]		[[Script Classes for Adventure Games \| Table of Contents]]

	<span style="float: left">[[Script Classes for Adventure Games/RootObj Class\|< Previous: The RootObj Class]]</span>		<span style="float: left">[[Script Classes for Adventure Games/RootObj Class\|< Previous: The RootObj Class]]</span>
	<span style="float: right">[[Script Classes for Adventure Games/Collection Class\|Next: The Collection Class >]]</span>		<span style="float: right">[[Script Classes for Adventure Games/Collection Class\|Next: The Collection Class >]]</span>



	[[Category:References]]		[[Category:References]]
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			[[Category:Official SCI Documentation]]
	[[Category:Scripting]]		[[Category:Scripting]]
	[[Category:SCI Scripting]]		[[Category:SCI Scripting]]
	[[Category:Classes]]		[[Category:Classes]]
	[[Category:SCI Classes]]		[[Category:SCI Classes]]
			[[Category:Scripting]]
			[[Category:SCI Scripting]]
			[[Category:Object Class ]]

Andrew Branscom at 22:47, 5 January 2026

2026-01-05T22:47:12Z

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	[[~~Official~~ SCI ~~Documentation~~]]<br />		[[Category:SCI Pages]]
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			[[Official SCI Documentation]]

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	</div>~~<br />~~		</div>
			<div align="center"><span style="font-size: 22pt">The Object Class</span><br />''Author: [[Jeff Stephenson]]''<br />''1988-04-05''</div></div>
	<div align="center"><span style="font-size: 22pt">The Object Class</span><br />
	''Author: [[Jeff Stephenson]]''<br />
	''~~Date: 5 April~~ 1988''</div>

	~~ ~~

			<br />
	==<br /> The Object Class ==		==<br /> The Object Class ==

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Andrew Branscom at 22:36, 11 April 2018

2018-04-11T22:36:27Z

New page

[[Official SCI Documentation]]<br />
[[Script Classes for Adventure Games | Table of Contents]]

<div align="center">
Chapter:
[[Script Classes for Adventure Games/Introduction|1]] |
[[Script Classes for Adventure Games/RootObj Class|2]] |
[[Script Classes for Adventure Games/Object Class|3]] |
[[Script Classes for Adventure Games/Collection Class|4]] |
[[Script Classes for Adventure Games/Script Class|5]] |
[[Script Classes for Adventure Games/Timer Class|6]] |
[[Script Classes for Adventure Games/Feature Class|7]] |
[[Script Classes for Adventure Games/View Class|8]] |
[[Script Classes for Adventure Games/PicView Class|9]] |
[[Script Classes for Adventure Games/Cycling Classes|10]] |
[[Script Classes for Adventure Games/Motion Classes|11]] |
[[Script Classes for Adventure Games/Avoider Class|12]] |
[[Script Classes for Adventure Games/Event Class|13]] |
[[Script Classes for Adventure Games/User Class|14]]<br />
[[Script Classes for Adventure Games/Game Class|15]] |
[[Script Classes for Adventure Games/Locale Class|16]] |
[[Script Classes for Adventure Games/Region Class|17]] |
[[Script Classes for Adventure Games/Room Class|18]] |
[[Script Classes for Adventure Games/Timer2 Class|19]] |
[[Script Classes for Adventure Games/InvItem Class|20]] |
[[Script Classes for Adventure Games/Block Class|21]] |
[[Script Classes for Adventure Games/Cage Class|22]] |
[[Script Classes for Adventure Games/Sound Class|23]] |
[[Script Classes for Adventure Games/StatusLine Class|24]] |
[[Script Classes for Adventure Games/File Class|25]] |
[[Script Classes for Adventure Games/Code Class|26]] |
[[Script Classes for Adventure Games/Global Variables|27]] |
[[Script Classes for Adventure Games/Index|Index]]
</div><br />

<div align="center"><span style="font-size: 22pt">The Object Class</span><br />
''Author: [[Jeff Stephenson]]''<br />
''Date: 5 April 1988''</div>

 

==<br /> The Object Class ==

Class Object is the super-class of the majority of the classes in Script. It defines the default behavior for these classes, ensuring that all objects will respond to a certain basic set of messages.

{|
|In file||system.sc
|-
|Inherits from||RootObj
|-
|Inherited by||All classes
|}

===<br /> Properties: ===

<blockquote>
====<br /> name ====
<blockquote>This is a string representation of the name of the object or class. It is used by showSelf: to display the object. The compiler will use the symbol for an instance or class as its name unless name is explicitly set.</blockquote>
</blockquote>

===<br /> Methods ===

<blockquote>
====<br /> new: ====
<blockquote>Returns the ID of a new instance of the class or object. This new instance has the same methods and property values as the parent. The property values can be changed, the methods cannot.</blockquote>

====<br /> init: ====
<blockquote>Initializes the object. If the object is to show up on the screen (Views, Props, Actors and Egos), this is the message which will make the it show itself. The default does nothing.</blockquote>

====<br /> doit: ====
<blockquote>Do your thing, whatever that may be. Sometimes this is sent when the object is selected, sometimes (as for Actors) it is sent for each animation cycle. The default does nothing.</blockquote>

====<br /> dispose: ====
<blockquote>Dispose of the object. If the object was created using new:, this reclaims the memory occupied by that object. In this case it is an error to refer to the object ID being disposed of once the dispose: message has been sent. Subclasses of Object should make sure that they dispose of any objects which they created before doing a (super dispose:).</blockquote>

====<br /> showStr: where ====
<blockquote>Format a string describing the object at the storage pointed to by where. The default string is the object name.</blockquote>

====<br /> showSelf: ====
<blockquote>Display this object in a meaningful way. This is primarily used for debugging, in order to find out which objects are present. The default is to print the string produced by showStr:.</blockquote>

====<br /> perform: code [args...] ====
<blockquote>Execute code. Code must be an object of class Code with a doit: method whose first argument will refer to the object which is to perform the code. Thus, one way to implement showSelf: would be to create the Code object

<blockquote>
<div class="CodeBlockHeader">Code:</div>
<syntaxhighlight lang="sci">
(instance showMe of Code
(method (doit theObj)
(Print (theObj name?))
)
)
</syntaxhighlight>
</blockquote>

You could then make the object foo show itself even if it did not have a showSelf: method by writing

<blockquote><div class="CodeBlockHeader">Code:</div>
<syntaxhighlight lang="sci">(foo perform: showMe)</syntaxhighlight></blockquote>

Up to four arguments (besides the Code object ID) may be passed to perform:.</blockquote>

====<br /> myself: ====
<blockquote>Returns the object ID of the receiver. This is useful as the last in a series of messages to an object to force the entire send to return the ID of the object. For example, if you wish to add a newly created and initialized Actor to a List, you could write

<blockquote>
<div class="CodeBlockHeader">Code:</div>
<syntaxhighlight lang="sci">
(list add:
((Actor new:)
posn:100 100
view:5
setCycle: EndLoop
myself:
)
)
</syntaxhighlight>
</blockquote>
</blockquote>

====<br /> understands: selector ====
<blockquote>Returns TRUE if the object has a method corresponding to selector, FALSE otherwise.</blockquote>
</blockquote>

==<br /> References ==

<references />

==<br /> See Also: ==

* [[SCI Specifications]]

 

[[Script Classes for Adventure Games | Table of Contents]]

<span style="float: left">[[Script Classes for Adventure Games/RootObj Class|< Previous: The RootObj Class]]</span>
<span style="float: right">[[Script Classes for Adventure Games/Collection Class|Next: The Collection Class >]]</span>

 

[[Category:References]]
[[Category:SCI References]]
[[Category:Documentation]]
[[Category:SCI Documentation]]
[[Category:Scripting]]
[[Category:SCI Scripting]]
[[Category:Classes]]
[[Category:SCI Classes]]

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	* [[:Category:SCI Object Class \|SCI Object Class]]		* [[:Category:SCI Object Class \|SCI Object Class]]
	* [[:Category:SCI Objects\|SCI Objects]]		* [[:Category:SCI Objects\|SCI Objects]]
	* [[:Category:SCI Object Class \|SCI Object Class]]