Created
December 2, 2010 00:31
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Python port of adjust.js
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| #!/usr/bin/python | |
| """ | |
| adjust.py | |
| Python port of adjust.js (original by Bratliff: <http://www.polyarc.us/adjust.js>) | |
| Ported by Gatubit <[email protected]> | |
| """ | |
| import math | |
| """ | |
| Parameters: | |
| - x: X pixel offset of new map center from old map center | |
| - y: Y pixel offset of new map center from old map center | |
| - lon: Longitude of map center | |
| - lat: Latitude of map center | |
| - z: Zoom level | |
| Return Values: | |
| - resultX: Longitude of adjusted map center | |
| - resultY: Latitude of adjusted map center | |
| """ | |
| def XYToLL(x, y, lon, lat, z): | |
| resultX = XToLon( | |
| LonToX(lon) + ( | |
| x << (21 - z) | |
| ) | |
| ) | |
| resultY = YToLat( | |
| LatToY(lat) + ( | |
| y << (21 - z) | |
| ) | |
| ) | |
| return resultX, resultY | |
| # ======================= # | |
| OFFSET = 268435456 | |
| RADIUS = OFFSET / math.pi | |
| def LonToX(lon): | |
| return round( | |
| OFFSET + RADIUS * math.radians(lon) | |
| ) | |
| def LatToY(lat): | |
| return round( | |
| OFFSET - RADIUS * (math.log( | |
| (1 + math.sin(math.radians(lat))) | |
| / | |
| (1 - math.sin(math.radians(lat))) | |
| )) / 2 | |
| ) | |
| def XToLon(x): | |
| return math.degrees( | |
| (round(x) - OFFSET) / RADIUS | |
| ) | |
| def YToLat(y): | |
| return math.degrees( | |
| math.pi / 2 - 2 * math.atan( | |
| math.exp((round(y) - OFFSET) / RADIUS) | |
| ) | |
| ) |
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