org.openstreetmap.josm.data.projection

Interface Projection

All Known Implementing Classes:

AbstractProjection, CustomProjection

public interface Projection

A projection, i.e. a class that supports conversion from lat/lon to east/north and back. The conversion from east/north to the screen coordinates is simply a scale factor and x/y offset.

Method Summary

Modifier and Type	Method and Description
LatLon	eastNorth2latlon(EastNorth en) Convert from easting/norting to lat/lon.
java.lang.String	getCacheDirectoryName() Get a filename compatible string (for the cache directory).
double	getDefaultZoomInPPD() The default scale factor in east/north units per pixel (NavigatableComponent.scale)).
Bounds	getWorldBoundsLatLon() Get the bounds of the world.
EastNorth	latlon2eastNorth(LatLon ll) Convert from lat/lon to easting/northing.
java.lang.String	toCode() Return projection code.
java.lang.String	toString() Describe the projection in one or two words.

Method Detail

getDefaultZoomInPPD

double getDefaultZoomInPPD()

The default scale factor in east/north units per pixel (NavigatableComponent.scale)). FIXME: misnomer

Returns:

the scale factor

latlon2eastNorth

EastNorth latlon2eastNorth(LatLon ll)

Convert from lat/lon to easting/northing.

Parameters:

ll - the geographical point to convert (in WGS84 lat/lon)

Returns:

the corresponding east/north coordinates

eastNorth2latlon

LatLon eastNorth2latlon(EastNorth en)

Convert from easting/norting to lat/lon.

Parameters:

en - the geographical point to convert (in projected coordinates)

Returns:

the corresponding lat/lon (WGS84)

toString

java.lang.String toString()

Describe the projection in one or two words.

Overrides:

toString in class java.lang.Object

Returns:

the name / description

toCode

java.lang.String toCode()

Return projection code. This should be a unique identifier. If projection supports parameters, return a different code for each set of parameters. The EPSG code can be used (if defined for the projection).

Returns:

the projection identifier

getCacheDirectoryName

java.lang.String getCacheDirectoryName()

Get a filename compatible string (for the cache directory).

Returns:

the cache directory name (base name)

getWorldBoundsLatLon

Bounds getWorldBoundsLatLon()

Get the bounds of the world.

Returns:

the supported lat/lon rectangle for this projection