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/*======================== MiscIrelandOldUTMCoord.m =========================*/
/* MiscIrelandOldUTMCoord class contains and supports values representing
locations in an Irish Universal Transverse Mercator coordinate system
using the airy constants of 1953.
DMA Release 0.8, Copyright @1993 by Genesis Project, Ltd. All Rights
Reserved. For further information on terms and conditions see:
Documentation/GISKit/Agreements-Legal-README
HISTORY
26-Mar-93 Dale Amon at GPL
Subsumed IrishGridOldUTMConstants class into this one.
21-Mar-93 Dale Amon at GPL
Created.
*/
#import <MiscFoundation/MiscIrelandOldUTMCoord.h>
#import "_MiscError.h"
@implementation MiscIrelandOldUTMCoord
/*===========================================================================*/
/* Internal methods */
/*===========================================================================*/
/* note that we override values because the document for the Irish grid
has values which do not match the ones calculated from their own formulae
and constants:
eSqrd n
calculated 0.006670540605897831814 0.001673220462817007959
book 0.00667054015 0.001673220462
*/
static id theOldIrishGrid = nil;
+ makeGrid
{
if (!theOldIrishGrid)
{theOldIrishGrid = [[MiscUTMConstants allocWithZone:[self zone]]
initGridName: @"Old Irish Grid"
trueOrigin: 53.5 : -8.0
inGrid: 200000.0 : 250000.0
onSphere: 6377340.189 : 6356034.446
centralMeridianScaling: 1.000035];
[theOldIrishGrid override_eSqrd: 0.00667054015 n: 0.001673220462];
[theOldIrishGrid setProtected];
}
return theOldIrishGrid;
}
/*===========================================================================*/
/* Initialization methods. If we don't already have a UTM constants object
for the Old Irish Grid, create one instance that all will share and that
cannot be deleted.
Values are from the Irish Ordinance Survey document, "Tables for the
Transverse Mercator Projection of Ireland", 1953, reprinted 1971.
*/
/*===========================================================================*/
/* DESIGNATED INITIALIZER */
-initDescription: (NSString *) txt
{
[super initDescription: txt constants: [MiscIrelandOldUTMCoord makeGrid]];
/* over ride the standard converter */
converter = [MiscIrelandCoordConverter new];
return self;
}
/*---------------------------------------------------------------------------*/
/* Block the designated initializer of our parent class */
-initDescription: (NSString *) txt constants: anObject
{
MISC_ERROR_BAIL;
return self;
}
/*===========================================================================*/
/* Archive methods */
/*===========================================================================*/
- initWithCoder:(NSCoder *)aCoder
{ self = [super initWithCoder:aCoder];
[constants setUnprotected];
[constants release];
[MiscIrelandOldUTMCoord makeGrid];
return self;
}
@end
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