127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
/**************************************************************************
|
|
* bucketutils.h -- support routines to handle fgBUCKET operations
|
|
*
|
|
* Written by Curtis Olson, started January 1998.
|
|
*
|
|
* Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of the
|
|
* License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
* $Id$
|
|
* (Log is kept at end of this file)
|
|
**************************************************************************/
|
|
|
|
|
|
#ifndef _BUCKETUTILS_H
|
|
#define _BUCKETUTILS_H
|
|
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
|
|
typedef struct {
|
|
int lon; /* longitude (-180 to 179) */
|
|
int lat; /* latitude (-90 to 89) */
|
|
int x; /* x (0 to 7) */
|
|
int y; /* y (0 to 7) */
|
|
} fgBUCKET;
|
|
|
|
|
|
/* Generate the unique scenery tile index containing the specified
|
|
lon/lat parameters.
|
|
|
|
The index is constructed as follows:
|
|
|
|
9 bits - to represent 360 degrees of longitude (-180 to 179)
|
|
8 bits - to represent 180 degrees of latitude (-90 to 89)
|
|
|
|
Each 1 degree by 1 degree tile is further broken down into an 8x8
|
|
grid. So we also need:
|
|
|
|
3 bits - to represent x (0 to 7)
|
|
3 bits - to represent y (0 to 7) */
|
|
long int fgBucketGenIndex(fgBUCKET *p);
|
|
|
|
|
|
/* Parse a unique scenery tile index and find the lon, lat, x, and y */
|
|
void fgBucketParseIndex(long int index, fgBUCKET *p);
|
|
|
|
|
|
/* Build a path name from an tile index */
|
|
void fgBucketGenBasePath(fgBUCKET *p, char *path);
|
|
|
|
|
|
/* offset an bucket struct by the specified amounts in the X & Y direction */
|
|
void fgBucketOffset(fgBUCKET *in, fgBUCKET *out, int x, int y);
|
|
|
|
|
|
/* Given a lat/lon in degrees, find the "bucket" or tile that it falls
|
|
within */
|
|
void fgBucketFind(double lon, double lat, fgBUCKET *p);
|
|
|
|
|
|
/* Given a lat/lon, fill in the local tile index array */
|
|
void fgBucketGenIdxArray(fgBUCKET *p1, fgBUCKET *tiles, int width, int height);
|
|
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
|
|
#endif /* _BUCKETUTILS_H */
|
|
|
|
|
|
/* $Log$
|
|
/* Revision 1.2 1998/07/04 00:46:48 curt
|
|
/* typedef'd struct fgBUCKET.
|
|
/*
|
|
* Revision 1.1 1998/04/08 23:28:59 curt
|
|
* Adopted Gnu automake/autoconf system.
|
|
*
|
|
* Revision 1.2 1998/01/24 00:03:28 curt
|
|
* Initial revision.
|
|
*
|
|
* Revision 1.1 1998/01/23 20:06:52 curt
|
|
* tileutils.* renamed to bucketutils.*
|
|
*
|
|
* Revision 1.6 1998/01/22 02:59:42 curt
|
|
* Changed #ifdef FILE_H to #ifdef _FILE_H
|
|
*
|
|
* Revision 1.5 1998/01/14 02:19:05 curt
|
|
* Makde offset_bucket visible to outside.
|
|
*
|
|
* Revision 1.4 1998/01/13 00:23:12 curt
|
|
* Initial changes to support loading and management of scenery tiles. Note,
|
|
* there's still a fair amount of work left to be done.
|
|
*
|
|
* Revision 1.3 1998/01/10 00:01:48 curt
|
|
* Misc api changes and tweaks.
|
|
*
|
|
* Revision 1.2 1998/01/08 02:22:28 curt
|
|
* Continue working on basic features.
|
|
*
|
|
* Revision 1.1 1998/01/07 23:50:52 curt
|
|
* "area" renamed to "tile"
|
|
*
|
|
* Revision 1.1 1998/01/07 23:23:40 curt
|
|
* Initial revision.
|
|
*
|
|
* */
|
|
|
|
|