Re: [swarm-hackers] Still learning the framework...

[Scott Christley]

On Nov 19, 2009, at 12:51 AM, Nima Talebi wrote:

> I see - so If I was going to follow your latter model, I would  
> change my "world" (HeatSpace) not inherit from Diffuse2d, but  
> instead manage a hash of grids, each concerned with one property?
>
> What class is your grid controller derived from?  Do you then just  
> use an NSDictionary to manage them?  And am I correct the this class  
> then provides a service like so...

Yes. NSObject. Yes.


> - cellOnGrid:(GridType)gT atPosition(Position)s;

and similar, but the grids have a name so you retrieve a grid by  
asking for it by name

- gridWithName: (NSString *)aName;



> ...One thing I haven't quite understood is what you mean by spatial  
> scale?
>
> Do all your grids managed by the grid manager have the same  
> dimension and cardinality? For example, say one grid is a 2D  
> 120x140, is it then imposed that all grids should also be 2D 120x140?

No, they can have different dimension.  Right now I only support  
integer scale differences, for example one grid as scale=1 might be  
120x140 while another grid at scale=2 would be 240x280.  However I  
assume they cover the same physical area, but I might want to use a  
finer or coarse grid for representation.  Typically the use of a finer  
grid might be a requirement for accuracy.  For example, biological  
cells are much much larger than individual proteins, like on a scale  
10000:1 so using the same grid resolution for both cells and proteins  
would likely be very inaccurate for the proteins.


> Spatial scale - you're referring to one grid to be holding values in  
> nanometers, and the other is in micrograms for example?

Yeah except micrograms isn't a unit of length, it is a unit of mass,  
but the idea is right.

Scott