Module calculations

Calculations routines

Author: P. Tute

Contact: henne@dcsec.uni-hannover.de

License: GPLv3

Functions

lat_lon_to_tilenr(lat_deg, lon_deg, zoom)
Calculates the OpenStreetMap-tile number from given latitude, longitude and zoom.

source code

latlon_to_xy(lat, lon, zoom, player)
Calculates x any y coordinates for drawing based on current center-tile and zoom.

source code

bresenham_circle(x, y, rad)
Calculates coordinates for drawing a circle using Bresenham's circle algorithm.

source code

Variables

__maintainer__ = 'B. Henne'

TILE_SIZE = 256

__package__ = 'viewer.lib'

Function Details

Calculates the OpenStreetMap-tile number from given latitude, longitude and zoom.

Author: P. Tute

Calculates x any y coordinates for drawing based on current center-tile and zoom.

Author: P. Tute

Calculates coordinates for drawing a circle using Bresenham's circle algorithm.

Returns a list of coordinates.

The algorithm is slightly modified to allow drawing transparent circles. http://en.wikipedia.org/wiki/Midpoint_circle_algorithm

Author: P. Tute