Re: Lists of Raster objects

[Ken Cline]

Matt,

Where did you add the "lifeDisplay" to the "displayList" ?

I didn't see a line like: "[ displayList addLast: lifeDisplay ]"
anywhere within the loop.

BTW, you could move the "worldRaster" and "lifeDisplay"
pointer declarations out of the while-loop since you can
just keep reusing the one set of pointers. Perhaps the
compiler optimization routines do this automatically.

Ken.


On Fri, 3 Apr 1998, Matt M. Burke wrote:

> Help!  I'm sure I'm overlooking something simple....
> 
> First, I should mention I'm using the Win95 version since my access
> to our Sun network is temporarily down.
> 
> I've been trying to whip up a "simple" little test and have hit a snag.
> 
> Problem Summary:  I create a list of ZoomRasters and a list of
> Value2dDisplays and hook them up to a list of ConwayLife2ds.  The model
> compiles and runs, but all the raster windows are empty.
> 
> Details: (Code is attached at the end of this message.)
> 
> In ConwayModelSwarm I  create a list of ConwayLife2ds.  The Swarm
> implements a method "getWorldList" which returns this list of CAs.
> 
> In ConwayObserverSwarm I fetch the list of CAs from the model swarm
> and iterate over this list creating a ZoomRaster and a Value2dDisplay
> for each.
> 
> Now I build an ActionGroup and the first things I stick in there are
> a createActionForEach targeting the Value2dDisplay list and sending the
> message 'update' and then a createActionForEach targeting the raster list
> and sending a drawSelf message.
> 
> Now, here's the kicker:  I create two global variables myRaster and
> myDisplay and use them to temporarily hold each of the rasters/v2ds as
> I'm iterating over my list of CAs.  So when I finish the loop the two
> variables still point to the last raster/v2d that I created.  If I then
> stick the appropriate createAction messages so that myDisplay is given
> an update and myRaster is given a drawSelf then when I run the model I
> get (n-1) blank rasters and 1 raster that displays properly.
> 
> Ok, what am I overlooking?  Here's the relevent code from 
> ConwaryObserverSwarm:
> 
> 
> In buildObjects:
> 
> 
>   index = [ [conwayModelSwarm getWorldList] begin: [self getZone]];
>   while ( (world = [index next]) ) {
>     id <ZoomRaster> worldRaster;
>     Value2dDisplay* lifeDisplay;
> 
>     worldRaster = [ZoomRaster createBegin: [self getZone]];
>     SET_WINDOW_GEOMETRY_RECORD_NAME (worldRaster);
>     worldRaster = [worldRaster createEnd];
>     [worldRaster enableDestroyNotification: self
>                notificationMethod: @selector (_worldRasterDeath_:)];
>     [worldRaster setColormap: colormap];
>     [worldRaster setZoomFactor: 4];
>     [worldRaster setWidth: [conwayModelSwarm getWorldXSize] 
>                Height: [conwayModelSwarm getWorldYSize]];
>     [worldRaster setWindowTitle: "Conway's Life World"];
>     [worldRaster pack];               
>     [rasterList addLast: worldRaster];
> 
>     myRas = worldRaster;
> 
>     lifeDisplay = [Value2dDisplay createBegin: [self getZone]];
>     [lifeDisplay setDisplayWidget: worldRaster colormap: colormap];
>     [lifeDisplay setDiscrete2dToDisplay: world];
>     lifeDisplay = [lifeDisplay createEnd];
> 
>     myDis = lifeDisplay;
> 
>   }
> 
> 
> 
> and in buildActions:
> 
>   displayActions = [ActionGroup create: [self getZone]];
> 
>   [displayActions createActionForEach: displayList message: M(display)];
>   [displayActions createActionForEach: rasterList message: M(drawSelf)];
>   [displayActions createActionTo: myDis message: M(display)];
>   [displayActions createActionTo: myRas message: M(drawSelf)];
>   [displayActions createActionTo: probeDisplayManager message: M(update)];
>   [displayActions createActionTo: actionCache message: M(doTkEvents)];
> 
>   displaySchedule = [Schedule createBegin: [self getZone]];
>   [displaySchedule setRepeatInterval: displayFrequency]; 
>   displaySchedule = [displaySchedule createEnd];
>   [displaySchedule at: 0 createAction: displayActions];
> 
> 
> 
>                   ==================================
>    Swarm-Support is for discussion of the technical details of the day
>    to day usage of Swarm.  For list administration needs (esp.
>    [un]subscribing), please send a message to <address@hidden>
>    with "help" in the body of the message.
>                   ==================================
> 

_________________________________________________________
Ken Cline                             address@hidden
SAIC                                 VOICE (410) 571-0413
Annapolis, MD                          FAX (301) 261-8427


                  ==================================
   Swarm-Support is for discussion of the technical details of the day
   to day usage of Swarm.  For list administration needs (esp.
   [un]subscribing), please send a message to <address@hidden>
   with "help" in the body of the message.
                  ==================================