Class IWProjection

An interface which has to be implemented by all map projections. A projection is used by the map to convert from pixel space to map coordinates and vice versa.

IWProjection

IWProjection()

Default constructor.

clone

clone()

Returns a copy of this projection.

initialize

void initialize(xmlDocument)

Initializes the projection parameters from a XML document.

Parameters:
Document xmlDocument - a XML document storing all parameters used by the current projection

Returns:
void 

meterToPixel

IWPoint meterToPixel(coord)

Returns the offset in pixels of the specified coordinate to the map center.

Parameters:
IWCoordinate coord - a coordinate

Returns:
IWPoint 

needsReload

boolean needsReload(size)

Checks whether the map has to be reloaded completely to display the specified region.

Parameters:
IWSize size - the size of the visible part of the map in pixels

Returns:
boolean 

pixelToMeter

IWCoordinate pixelToMeter(offset)

Returns the coordinate of the current map center plus the specified offset in pixels.

Parameters:
IWPoint offset - an offset

Returns:
IWCoordinate 

toString

String toString()

Returns a text representation of this projection.

Returns:
String