Re: [Swarm-Support] Also Button Problem

[Paul E Johnson]

Without seeing the code in your ProbeMaker where you set the Grids in 
there and then design a method for it to hunt through the grids in 
response to the makeProbeAtX:Y: method, I can't say what is going wrong. 
Could be a typo in your Message line where it gives an extra :.

Anwyay, here's a makeProbeAtX:Y: method from another project I use. This 
one is from my MultiGrid2d class, the multiple-occupancy grid that I've 
posted in the past here.  This one searches through a cell at x,y and 
chooses one item at random to probe. You need to redesign your method to 
search through the grids to find an agent at x,y.


- makeProbeAtX: (unsigned)x Y: (unsigned)y
{
  id obj;
  id <AppCell> cell;
  if (x >= 0
      && x < xsize
      && y >= 0
      && y < ysize)
    {
      cell = *discrete2dSiteAt(lattice, offsets, x, y);
      if(cell)
        {
          obj = [cell getRandomItem];
          CREATE_PROBE_DISPLAY (obj);
        }
      else
        GUI_BEEP ();
    }
  else
    [WarningMessage
      raiseEvent:
        "MultiGrid2d: invalid coordinates to make probe (%d,%d)\n",
      x, y];
  return self;
}




luo pi wrote:
> Hi,
> With Paul Johnson's advice, I design a class---
> ProbeMaker, and write the "makeProbeAtX:Y:" method in
> it. In the ObserverSwarm, the source coder is as
> follows:
> ProbeMaker * probeMaker;
> …               
> probeMaker = [ProbeMaker createBegin: self];
> probeMaker = [probeMaker createEnd];    
>    
> [worldRaster setButton: ButtonRight
>                Client: probeMaker
> Message: M(makeProbe:AtX:Y:)];
> However, I find that when clicking with right button
> on the raster, the program is closed even if there is
> nothing except the sentence “return self;” in
> "makeProbeAtX:Y:" method.
> I do not know where the problem is. Maybe you can give
> me more detailed about this thought.
> Thank you very much!
>                                     Patrick.L


--
Paul E. Johnson                       email: address@hidden
Dept. of Political Science            http://lark.cc.ku.edu/~pauljohn
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