How to get screen co-ordinates (pixels) from geographic co-ordinates

[Sandeep Kumar Jakkaraju]

My problem is

I have a shp file in which is unprojected .. in lon,lat co-ordinates
I create an image from that shapefile ..using php mapscript...

I have a gps coordinates of a point in (lon,lat) ... i want its
corresponding pixels in that image ... like (500,500)



Thanx

-- 
Sandeep Kumar Jakkaraju
WeBlog:
http://jakkarajus.blogspot.com
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