91efc5ad87
fgBUCKET struct and C routines. This FGBucket class adjusts the tile width towards the poles to ensure the tiles are at least 8 miles wide.
135 lines
3.8 KiB
C
135 lines
3.8 KiB
C
// bucketutils.h -- support routines to handle fgBUCKET operations
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//
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// Written by Curtis Olson, started January 1998.
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//
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// Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// $Id$
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// (Log is kept at end of this file)
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#ifndef _BUCKETUTILS_H
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#define _BUCKETUTILS_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct {
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int lon; // longitude (-180 to 179)
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int lat; // latitude (-90 to 89)
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int x; // x (0 to 7)
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int y; // y (0 to 7)
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} fgBUCKET;
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/* Generate the unique scenery tile index containing the specified
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lon/lat parameters.
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The index is constructed as follows:
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9 bits - to represent 360 degrees of longitude (-180 to 179)
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8 bits - to represent 180 degrees of latitude (-90 to 89)
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Each 1 degree by 1 degree tile is further broken down into an 8x8
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grid. So we also need:
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3 bits - to represent x (0 to 7)
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3 bits - to represent y (0 to 7) */
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long int fgBucketGenIndex( const fgBUCKET *p);
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// Parse a unique scenery tile index and find the lon, lat, x, and y
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void fgBucketParseIndex(long int index, fgBUCKET *p);
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// Build a path name from an tile index
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void fgBucketGenBasePath( const fgBUCKET *p, char *path);
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// offset a bucket struct by the specified amounts in the X & Y direction
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void fgBucketOffset(fgBUCKET *in, fgBUCKET *out, int x, int y);
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// Given a lat/lon in degrees, find the "bucket" or tile that it falls
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// within
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void fgBucketFind(double lon, double lat, fgBUCKET *p);
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// Given a lat/lon, fill in the local tile index array
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void fgBucketGenIdxArray(fgBUCKET *p1, fgBUCKET *tiles, int width, int height);
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#ifdef __cplusplus
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}
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#endif
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#endif // _BUCKETUTILS_H
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// $Log$
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// Revision 1.5 1999/02/08 23:52:15 curt
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// Added a new "newbucket.[ch]xx" FGBucket class to replace the old
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// fgBUCKET struct and C routines. This FGBucket class adjusts the tile
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// width towards the poles to ensure the tiles are at least 8 miles wide.
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//
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// Revision 1.4 1998/12/09 18:48:09 curt
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// Use C++ style comments.
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//
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// Revision 1.3 1998/12/07 21:08:03 curt
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// Added a const in a couple places to get rid of annoying compiler warnings.
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//
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// Revision 1.2 1998/07/04 00:46:48 curt
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// typedef'd struct fgBUCKET.
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//
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// Revision 1.1 1998/04/08 23:28:59 curt
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// Adopted Gnu automake/autoconf system.
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//
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// Revision 1.2 1998/01/24 00:03:28 curt
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// Initial revision.
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//
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// Revision 1.1 1998/01/23 20:06:52 curt
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// tileutils.* renamed to bucketutils.*
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//
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// Revision 1.6 1998/01/22 02:59:42 curt
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// Changed #ifdef FILE_H to #ifdef _FILE_H
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//
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// Revision 1.5 1998/01/14 02:19:05 curt
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// Makde offset_bucket visible to outside.
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//
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// Revision 1.4 1998/01/13 00:23:12 curt
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// Initial changes to support loading and management of scenery tiles. Note,
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// there's still a fair amount of work left to be done.
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//
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// Revision 1.3 1998/01/10 00:01:48 curt
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// Misc api changes and tweaks.
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//
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// Revision 1.2 1998/01/08 02:22:28 curt
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// Continue working on basic features.
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//
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// Revision 1.1 1998/01/07 23:50:52 curt
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// "area" renamed to "tile"
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//
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// Revision 1.1 1998/01/07 23:23:40 curt
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// Initial revision.
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//
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