[ka-Map-users] equidistant projection assumption

[Moran Ben-David]

Hi all,

 

I have been going through the kaMap code and noticed what I think is an
assumption that the projection of the map that it is using is equidistant.
Am I right?

 

I am about to write my own version of various functions such as zoomTo
(where I noticed this assumption), however, I just want to make sure I'm not
wrong in this before I proceed.

 

Here's a code snippet (kaMap.js) in zoomTo()

 

this.cellSize = newScale/(oMap.resolution * inchesPerUnit[oMap.units]);

.

var cpX = cgX / this.cellSize;

var cpY = cgY / this.cellSize;

 

The translation there from geo to pixel space seems to assume that y (pixel)
is proportional to y (geo) linearly. I think. am I off track here entirely?

 

Thanks in advance,

Moran Ben-David

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.maptools.org/pipermail/ka-map-users/attachments/20060131/50c7e853/attachment.html