Renuka wrote:
> Hi all,
>
> I am trying to embed static maps into a Windows Mobile Forms app. I
> get a byte array of the static map image from a web method, which I
> convert to an Image type and paint on a GUI element [all these in .NET
> CF... ignore these]
>
> The problem is I want the map image on the Form element to have
> clickable Push pins.....
>
> I (of course,) have the latitude and longitude of the center of the
> map.... I also have the lat and long of other markers (push
> pins).....and also the zoom level....
>
> how can i calculate the screen pixel coordinates of the pushpins and
> the center.....
>
> I found a formula on a page to get the absolute pixel coordinates of
> a given point.. i.e., the pixel coordinates w.r.t the top left corner
> of the top left tile of the entire Earth at a particular zoom level
> (let's say zoom level 17).
>
> But, given a 512x512 px image, I want the screen pixels.... i.e, w.r.t
> the top left corner..... all this extrapolated leads me to get to find
> the lat and long of the top left corner -> I have to find the lat and
> long bounds of the static image.....
>
> ex:
>
> I want the screen pixels of the center of a static map centered at
> (lat, long): 33.319503, -86.713899 zoomed at 17, 512x512 px...... and
> it's lat and lon bounds....
>
> All these without using the javascript API's methods..... as i have to
> implement this on a device, not in a web page....
>
> Or, if there is a better approach to all this, I would appreciate it.
> Any suggestions will be appreciated....
>
> Thanks in advance,
> Renuka Prasad.
Look at:
www.polyarc.us/adjust.js
The function "LLToXY(X,Y,x,y,z)" expects five arguments:
X = Longitude of your marker
Y= Latitude of your marker
x = Longitude of center of map
y = Latitude of center of map
z = Zoom level of map
It returns an object {x:,y:}
x = x pixel offset of marker from CENTER of map
y = y pixel offset of marker from CENTER of map
The actual map dimensions do not matter except to determine whether
the offset is visible.
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