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thd_center.c
Go to the documentation of this file.00001
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00006 #include "mrilib.h"
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00008 THD_fvec3 THD_dataset_center( THD_3dim_dataset * dset )
00009 {
00010 THD_dataxes * daxes ;
00011 THD_fvec3 fv1 , fv2 ;
00012
00013 ENTRY("THD_dataset_center") ;
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00015 if( !ISVALID_DSET(dset) ){ LOAD_FVEC3(fv1,0,0,0); RETURN(fv1); }
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00017 daxes = dset->daxes ;
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00019 LOAD_FVEC3(fv1 , daxes->xxorg , daxes->yyorg , daxes->zzorg) ;
00020 fv1 = THD_3dmm_to_dicomm( dset , fv1 ) ;
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00022 LOAD_FVEC3(fv2 , daxes->xxorg + (daxes->nxx-1)*daxes->xxdel ,
00023 daxes->yyorg + (daxes->nyy-1)*daxes->yydel ,
00024 daxes->zzorg + (daxes->nzz-1)*daxes->zzdel ) ;
00025 fv2 = THD_3dmm_to_dicomm( dset , fv2 ) ;
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00027 fv1.xyz[0] = 0.5*(fv1.xyz[0]+fv2.xyz[0]) ;
00028 fv1.xyz[1] = 0.5*(fv1.xyz[1]+fv2.xyz[1]) ;
00029 fv1.xyz[2] = 0.5*(fv1.xyz[2]+fv2.xyz[2]) ;
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00031 RETURN(fv1) ;
00032 }
