convert latitude and longitude into x and y cordinates [duplicate]

Possible Duplicate:

Longitude, Latitude to XY coordinate conversion

In my iphone application i am getting latitude and longitude of my current place.But I want to draw a line graph taking these latitude and longitude as points.How this is possible??

Try this:

CLLocationCoordinate2D coord = CLLocationCoordinate2DMake(latitudeInFloat, longitudeInFloat);
MKMapPoint point = MKMapPointForCoordinate(coord);
NSLog(@"x is %i and y is %i",point.x,point.y);