org.osmdroid.api

Interface IProjection

All Known Implementing Classes:

MapView.Projection

public interface IProjection

An interface that resembles the Google Maps API Projection interface and is implemented by the osmdroid MapView.Projection class.

Author:

Neil Boyd

Method Summary

Methods

Modifier and Type	Method and Description
IGeoPoint	fromPixels(int x, int y) Create a new GeoPoint from pixel coordinates relative to the top-left of the MapView that provided this PixelConverter.
IGeoPoint	getNorthEast() Get the coordinates of the most north-easterly visible point of the map.
IGeoPoint	getSouthWest() Get the coordinates of the most south-westerly visible point of the map.
float	metersToEquatorPixels(float meters) Converts a distance in meters (along the equator) to one in (horizontal) pixels at the current zoomlevel.
android.graphics.Point	toPixels(IGeoPoint in, android.graphics.Point out) Converts the given GeoPoint to onscreen pixel coordinates, relative to the top-left of the MapView that provided this Projection.

Method Detail

toPixels

android.graphics.Point toPixels(IGeoPoint in,
                              android.graphics.Point out)

Converts the given GeoPoint to onscreen pixel coordinates, relative to the top-left of the MapView that provided this Projection.

Parameters:

in - The latitude/longitude pair to convert.

out - A pre-existing object to use for the output; if null, a new Point will be allocated and returned.

fromPixels

IGeoPoint fromPixels(int x,
                   int y)

Create a new GeoPoint from pixel coordinates relative to the top-left of the MapView that provided this PixelConverter.

metersToEquatorPixels

float metersToEquatorPixels(float meters)

Converts a distance in meters (along the equator) to one in (horizontal) pixels at the current zoomlevel. In the default Mercator projection, the actual number of pixels for a given distance will get higher as you move away from the equator.

Parameters:

meters - the distance in meters

Returns:

The number of pixels corresponding to the distance, if measured along the equator, at the current zoom level. The return value may only be approximate.

getNorthEast

IGeoPoint getNorthEast()

Get the coordinates of the most north-easterly visible point of the map.

getSouthWest

IGeoPoint getSouthWest()

Get the coordinates of the most south-westerly visible point of the map.