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> --- Begin Message ---
>
>
>
> Subject: 
>
> Displaying before running revisited
>
>
>
>
> Date: 
>
> Thu, 11 Dec 1997 21:50:41 +1100
>
>
>
>
> A few months ago there was a discussion on how to display the state of 
> the world at time 0. Sven showed how to break down and activate 
> schedules to achieve this. I'm trying to make a "movie" of my sim and 
> need to capture the screen at t=0, but am having trouble getting this to 
> work :-(. 
> The sim displays t=0 then immediately updates the screen for t=1 before 
> stopping. My observerswarm activateIn and buildActions methods are as 
> follows:
>
> -activateIn: (id) swarmContext {
>   // put self (observer swarm) on the schedule of the GUI swarm
>   [super activateIn: swarmContext];
>
>   [startDisplaySchedule activateIn: self ];   // <-- update the display
>
>   [startHaltingSchedule activateIn: self ];   // <-- halt & wait for 
>                                                      'go'
>
>   // start the activity for the model swarm
>   [modelSwarm activateIn: self];
>
>   // start the display schedule
>   [displaySchedule activateIn: self ];
>   [tkEventSchedule activateIn: self ];
>   
>   return [self getSwarmActivity];
> }
>
> -buildActions {
>
>   [super buildActions];
>   
>   [modelSwarm buildActions];
>
>   displayActions = [ActionGroup create: [self getZone]];
>   [displayActions createActionTo: worldRaster message: M(erase)];
>   [displayActions createActionTo: [modelSwarm getWorld] message: 
>                                   M(drawSelfOn:):(id) worldRaster];
>   [displayActions createActionTo: worldRaster message: M(drawSelf)];
>   [displayActions createActionTo: self message: M(doStats)];
>   [displayActions createActionTo: probeDisplayManager message: 
>                                   M(update)];
>
>   displaySchedule = [Schedule createBegin: [self getZone]];
>   [displaySchedule setRepeatInterval: displayFrequency];
>   displaySchedule = [displaySchedule createEnd];
>   [displaySchedule at: displayFrequency-1 createAction: displayActions];
>
>   startDisplaySchedule = [Schedule create: [self getZone]];
>   [startDisplaySchedule at: 0
>               createAction: displayActions ];
>
>   tkEventSchedule = [Schedule createBegin: [self getZone]];
>   [tkEventSchedule  setRepeatInterval: displayFrequency];
>   tkEventSchedule = [tkEventSchedule createEnd];
>   [tkEventSchedule at: displayFrequency-1 
>        createActionTo: controlPanel 
>               message: M(doTkEvents)];
>
>   startHaltingSchedule = [Schedule create: [self getZone]];
>   [startHaltingSchedule at: 0
>             createActionTo: controlPanel 
>                    message: M(setStateStopped)];
>
>   return self;
> }  
>
> Can anyone explain to me why this doesn't work? I thought I was
> following Sven's recipe, but I must be missing something fundamental.
>
> Thanks in advance,
> -- 
> Phil Knight
>
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