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Subject: Re: How to restrict initAgents?
From: Pierre Bommel (bommel@cirad.fr)
Date: Mon Mar 06 2006 - 16:28:34 CET
Dear Mira,
To create and put your agents on restricted cells, you should write a
method. For example :
setRandomlyLocatedAgents: aClass n: aNumber constrainedBy: aBlock
" The new agents are randomly located on the cells verifying the
constraint "
| a targetCell |
aNumber timesRepeat:
[targetCell := Cormas selectRandomlyFrom: (self theESE select: [:c |
aBlock value: c]).
targetCell isNil
ifTrue:
[Dialog warn: 'No available cell for the constraint. The
simulation will stop'.
self halt].
a := self newEntity: aClass.
a perform: aSymbol withArguments: aCollec.
a moveTo: targetCell]
Then in your init, you can add :
super initAgents.
self setRandomlyLocatedAgents: Tourist n:100 constrainedBy: [:cell |
cell state=#land or:[cell state=#street]].
By adding the 2 joined .ST files, it is not necessary to create the
"setRandomlyLocatedAgents:n:constrainedBy:" method.
Remark: These methods will be in the next Cormas release (+
randomCellConstrainedBy: aBlock)
Pierre
Le 6 mars 06, à 10:55, Miao Wang a écrit :
> Hi all!
>
> I have imported a map into Cormas and I'm trying to simulate crowds
> walking in the streets.Now I have some problems:
>
> according to the tutorial, after I identified the intAgents in
> instance-creation like this
>
> initAgents
> super initAgents.
> self setRandomlyLocatedAgents: Tourist n:100
>
> The 100 agents are ramdomly standing all over the visualisation space
> window ,no matter which attibute the cell has(river or building or
> even out of the map(no value area)).But what I want is just to let the
> 100 agents been restricted in cells with attributes of 'lands' or
> 'streets'.
>
> I thought a conditonal test is needed. so I add:
>
> super initAgents.
> self patch state=#Lands ifTrue:[self setRandomlyLocatedAgents:
> Tourist n:100].
>
> But Cormas show:
>
> "Unhandled exception:message not understood:#patch."
patch is a method of AgentLocation (it returns the cell on which is
located the agent). It is not a method of CormasModel.
>
> Is there anyone who can give me some idea about it?
>
> Thank you very much!
>
> Mira
>
>
>
>
Pierre Bommel - CIRAD - UR Green
Universidade de Brasilia - CDS
SHIS QI 26, Conjunto 15, Casa 18
71670-150
Brasilia DF
tel: (00 55 61) 3367 3405
http://www.cirad.fr/ur/green