39 lines
1.1 KiB
C
39 lines
1.1 KiB
C
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/*
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open source routing machine
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Copyright (C) Dennis Luxen, others 2010
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU AFFERO General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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or see http://www.gnu.org/licenses/agpl.txt.
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*/
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#ifndef MERCATORUTIL_H_
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#define MERCATORUTIL_H_
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#include <cmath>
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif
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inline double y2lat(double a) {
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return 180/M_PI * (2 * atan(exp(a*M_PI/180)) - M_PI/2);
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}
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inline double lat2y(double a) {
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return 180/M_PI * log(tan(M_PI/4+a*(M_PI/180)/2));
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}
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#endif /* MERCATORUTIL_H_ */
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