cocoa - iOS MapKit - Points per meter -


i drawing circle in mkoverlayview subclass. have radius in meters. how convert said meters points (at zoom scale) drawing in drawmaprect:zoomscale:incontext:?

see headers:

helpers:

 // conversion between distances , projected coordinates  mk_extern cllocationdistance mkmeterspermappointatlatitude(cllocationdegrees latitude) ns_available(na, 4_0);  mk_extern double mkmappointspermeteratlatitude(cllocationdegrees latitude) ns_available(na, 4_0);   mk_extern cllocationdistance mkmetersbetweenmappoints(mkmappoint a, mkmappoint b) ns_available(na, 4_0);

and mkoverlayview

 // convert screen points relative view absolute mkmappoints  - (cgpoint)pointformappoint:(mkmappoint)mappoint;  - (mkmappoint)mappointforpoint:(cgpoint)point;

so 

double ppm = mkmappointspermeteratlatitude(centercoordinate.latitude); mkmappoint mkptleftmost = ptcenter.x -= ppm; cgpoint ptleftmost  = [self pointformappoint:mkptleftmost];

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