Class MMProjection

Object
   |
   +--MMProjection

Direct Known Subclasses:

MMMercatorProjection

class MMProjection

Defined in MultimapOpenAPI

Constructor Detail

MMProjection

MMProjection( )

An abstract class, the methods of which should be overridden to be used by an MMMapType.

Parameters:
zoom_factors - The number of zoom factors you want this projection to work over.

checkTileRange

void checkTileRange( <MMPoint> tile, <integer> zoom_factor, tilesize )

Checks whether the given tile coordinates are valid for the projection. It may also modify the coordinates of the tile to allow wrapping of tiles.

Parameters:
tile - Coordinates of a tile. *
zoom_factor - The zoom factor to check the tile at.
tile_size - The size of the tile.

fromLatLonToPixel

MMPoint fromLatLonToPixel( <MMLatLon> pos, <integer> zoom_factor )

Returns map coordinates in pixels for a point with the given coordinates, at the specified zoom factor.

Parameters:
pos - Geographic position of the point.
zoom_factor - The zoom factor at which you want the pixels returned.

fromPixelToLatLon

MMLatLon fromPixelToLatLon( <MMPoint> pixel, <integer> zoom_factor, unbounded )

Returns map coordinates in lat/lon for a point with the given coordinates in pixels, at the specified zoom factor.

Parameters:
pixel - Pixel position of the point.
zoom_factor - The zoom factor at which you want the coordinates returned.

getAxisMultiplier

MMPoint getAxisMultiplier()

Custom map tiles are numbered from 0,0 in the top left with numbers increasing to the right and downwards. By returning a point with either the X or the Y as -1 you can reverse the direction that the axis work and the corner that they start from. You should always return a value for X and a value for Y of either 1 or -1, any other values will give unpredictable results.

Returns:
By default returns (1,1).

getWrapWidth

void getWrapWidth( <integer> zoom_factor )

Returns the number of pixels after which the map repeats itself because it has wrapped around the earth.

Parameters:
zoom_factor - The zoom factor to check.