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| 1 | /* |
| 2 | * Copyright 2010 Niels Kummerfeldt <niels.kummerfeldt@tu-harburg.de> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 17 | * Boston, MA 02110-1301 USA |
| 18 | */ |
| 19 | |
| 20 | #include "projection.h" |
| 21 | |
| 22 | #include <cmath> |
| 23 | |
| 24 | qreal Projection::lon2rawx(qreal lon) |
| 25 | { |
| 26 | return (lon + 180.0) / 360.0; |
| 27 | } |
| 28 | |
| 29 | qreal Projection::lat2rawy(qreal lat) |
| 30 | { |
| 31 | return (1.0 - log(tan(lat * M_PI/180.0) + 1.0 / cos(lat * M_PI/180.0)) / M_PI) / 2.0; |
| 32 | } |
| 33 | |
| 34 | qreal Projection::lon2tilex(qreal lon, int z) |
| 35 | { |
| 36 | return (lon + 180.0) / 360.0 * (1 << z); |
| 37 | } |
| 38 | |
| 39 | qreal Projection::lat2tiley(qreal lat, int z) |
| 40 | { |
| 41 | return (1.0 - log(tan(lat * M_PI/180.0) + 1.0 / cos(lat * M_PI/180.0)) / M_PI) / 2.0 * (1 << z); |
| 42 | } |
| 43 | |
| 44 | qreal Projection::tilex2lon(qreal x, int z) |
| 45 | { |
| 46 | return x / (1 << z) * 360.0 - 180; |
| 47 | } |
| 48 | |
| 49 | qreal Projection::tiley2lat(qreal y, int z) |
| 50 | { |
| 51 | qreal n = M_PI - 2.0 * M_PI * y / (1 << z); |
| 52 | return 180.0 / M_PI * atan(0.5 * (exp(n) - exp(-n))); |
| 53 | } |
| 54 | |
| 55 | QString Projection::geo2string(const QPointF &geo) |
| 56 | { |
| 57 | QString lat = geo.y() > 0 ? QString("N %1").arg(geo.y()) : QString("S %1").arg(-geo.y()); |
| 58 | QString lon = geo.x() > 0 ? QString("E %1").arg(geo.x()) : QString("W %1").arg(-geo.x()); |
| 59 | return lat+" "+lon; |
| 60 | } |
| 61 | |
| 62 |
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