com.google.android.maps

Interface Projection

public interface Projection

A Projection serves to translate between the coordinate system of x/y on-screen pixel coordinates and that of latitude/longitude points on the surface of the earth. You obtain a Projection from MapView.getProjection().

Method Summary

Methods

Modifier and Type	Method and Description
GeoPoint	fromPixels(int x, int y) Create a new GeoPoint from pixel coordinates relative to the top-left of the MapView that provided this PixelConverter.
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(GeoPoint 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(GeoPoint 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

GeoPoint 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.