Projection API
A Projection in HyperLens serves to map physical (pixel) coordinates in a
scene to logical coordinates - typically Latitude/Longitude. It provides
associated functions such as the computation of distance.
To define a projection, you should extend the class
webthing.hyperlens.projection.Projection. The base Projection
class defines a working default, that uses simple Pixel coordinates
and Euclidean geometry.
Required Methods
To implement a projection, the following methods may be overridden:
- public double flongitude(Point p) throws ProjectionException
- Longitude of a point
- public double flatitude(Point p) throws ProjectionException
- Latitude of a point
- public Point latlong2point(double latitude, double longitude)
- Compute a point from latitude/longitude
- public fPoint latlong2fpoint(double latitude, double longitude)
- Compute a point in floating-point from latitude/longitude
- double fdist(Point base, Point p) throws ProjectionException
- Distance between two points
- public String latitude(Point p) throws ProjectionException
- Latitude as a formatted String
- public String longitude(Point p) throws ProjectionException
- Longitude as a formatted String
- protected String dist(Point base, Point p) throws ProjectionException
- Distance as a formatted String
- public void geoinit(String params)
- Initialise
