com.bbn.openmap.proj
Class LLXY

java.lang.Object
  com.bbn.openmap.proj.Proj
      com.bbn.openmap.proj.GeoProj
          com.bbn.openmap.proj.Cylindrical
              com.bbn.openmap.proj.LLXY

All Implemented Interfaces:

EqualArc, Projection, java.io.Serializable, java.lang.Cloneable

public class LLXY
extends Cylindrical
implements EqualArc

Implements the LLXY projection, which is basically something where the lat/lon and pixel ratios are the same.

See Also:

Serialized Form

Field Summary

protected double	cLat
protected double	cLon
protected double	cLonRad
static double	epsilon
protected double	hy
static java.lang.String	LLXYName The LLXY name.
protected double	ppd Pixel per degree
protected double	wx

Fields inherited from class com.bbn.openmap.proj.Cylindrical

half_world, world

Fields inherited from class com.bbn.openmap.proj.GeoProj

DATELINE, mercator, NORTH_POLE, NUM_DEFAULT_CIRCLE_VERTS, NUM_DEFAULT_GREAT_SEGS, pixelsPerMeter, planetPixelCircumference, planetPixelRadius, planetRadius, scaled_radius, SOUTH_POLE, XSCALE_THRESHOLD, XTHRESHOLD

Fields inherited from class com.bbn.openmap.proj.Proj

centerX, centerY, height, maxscale, MIN_HEIGHT, MIN_WIDTH, minscale, projID, rotationAngle, scale, ucuom, width

Constructor Summary

LLXY(LatLonPoint center, float scale, int width, int height)
Construct a LLXY projection.

Method Summary

protected void	computeParameters() Called when some fundamental parameters change.
static LLXY	convertProjection(Projection proj)
java.awt.geom.Point2D	forward(double lat, double lon, java.awt.geom.Point2D p, boolean isRadian) Forward projects lat,lon into XY space and returns a Point2D.
java.lang.String	getName() Get the name string of the projection.
double	getXPixConstant() Returns the x pixel constant of the projection.
double	getYPixConstant() Returns the y pixel constant of the projection.
<T extends java.awt.geom.Point2D> T	inverse(double x, double y, T llp) Inverse project x,y coordinates into a LatLonPoint.
boolean	isPlotable(double lat, double lon) Checks if a LatLonPoint is plot-able.
double	normalizeLatitude(double lat) Sets radian latitude to something sane.
double	normalizeLatitudeDeg(double lat)
java.lang.String	toString() Return stringified description of this projection.

Methods inherited from class com.bbn.openmap.proj.Cylindrical

_forwardPoly, _forwardPoly, dumpPoly, dumpPoly, forwardRaw, forwardRaw, getLowerRight, getUpperLeft, init

Methods inherited from class com.bbn.openmap.proj.GeoProj

assertLatLonPoint, clone, doPolyDispatch, doPolyDispatch, forward, forward, forward, forward, forwardArc, forwardArc, forwardArc, forwardCircle, forwardCircle, forwardCircle, forwardGreatPoly, forwardGreatPoly, forwardLine, forwardLine, forwardLLPoly, forwardPoly, forwardPoly, forwardRect, forwardRect, forwardRect, forwardRhumbPoly, forwardRhumbPoly, getCenter, getCenter, getGCTForProjection, getPlanetPixelCircumference, getPlanetPixelRadius, getPlanetRadius, getPPM, getReferenceLon, getScale, getUcuom, inverse, inverse, isComplicatedLineType, isPlotable, normalize_latitude, normalizeLatitude, pan, pan, setCenter, setCenter, setCenter, setPlanetRadius, setPPM, setUcuom, wrap_longitude, wrapLongitude, wrapLongitude, wrapLongitudeDeg

Methods inherited from class com.bbn.openmap.proj.Proj

drawBackground, drawBackground, equals, forward, forward, forward, forwardLine, forwardPoly, forwardPoly, forwardRect, forwardShape, getHeight, getMaxScale, getMinScale, getProjectionID, getRotationAngle, getScale, getWidth, hashCode, inverse, inverseShape, makeClone, panE, panE, panN, panN, panNE, panNE, panNW, panNW, panS, panS, panSE, panSE, panSW, panSW, panW, panW, setCenter, setHeight, setMaxScale, setMinScale, setParms, setProjectionID, setRotationAngle, setScale, setWidth

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.bbn.openmap.proj.Projection

forward, forward, forward, forward, forward, forward, forwardLine, forwardPoly, forwardPoly, forwardRaw, forwardRaw, forwardRect, forwardShape, getCenter, getCenter, getHeight, getLowerRight, getMaxScale, getMinScale, getProjectionID, getRotationAngle, getScale, getScale, getUcuom, getUpperLeft, getWidth, inverse, inverse, inverse, inverseShape, isPlotable, makeClone, pan, pan

Field Detail

LLXYName

public static final transient java.lang.String LLXYName

The LLXY name.

See Also:

Constant Field Values

epsilon

public static final transient double epsilon

See Also:

Constant Field Values

hy

protected double hy

wx

protected double wx

cLon

protected double cLon

cLonRad

protected double cLonRad

cLat

protected double cLat

ppd

protected double ppd

Pixel per degree

Constructor Detail

LLXY

public LLXY(LatLonPoint center,
            float scale,
            int width,
            int height)

Construct a LLXY projection.

Parameters:

center - LatLonPoint center of projection

scale - float scale of projection

width - width of screen

height - height of screen

Method Detail

toString

public java.lang.String toString()

Return stringified description of this projection.

Overrides:

toString in class Cylindrical

Returns:

String

See Also:

Projection.getProjectionID()

computeParameters

protected void computeParameters()

Called when some fundamental parameters change. Each projection will decide how to respond to this change. For instance, they may need to recalculate "constant" parameters used in the forward() and inverse() calls.

Overrides:

computeParameters in class Cylindrical

normalizeLatitude

public double normalizeLatitude(double lat)

Sets radian latitude to something sane. This is an abstract function since some projections don't deal well with extreme latitudes.

Specified by:

normalizeLatitude in class GeoProj

Parameters:

lat - float latitude in radians

Returns:

float latitude (-PI/2 <= y <= PI/2)

normalizeLatitudeDeg

public double normalizeLatitudeDeg(double lat)

isPlotable

public boolean isPlotable(double lat,
                          double lon)

Checks if a LatLonPoint is plot-able. This method is changed for 5.0. Previously, a point is always plot-able in the LLXY projection and that's because the llxy projection was kind of the cartesian coordinate system for OpenMap. I think we should start assuming that the llxy projection is kind of limited to plotable points on the Earth. So, we're checking that now.

Specified by:

isPlotable in interface Projection

Overrides:

isPlotable in class Proj

Parameters:

lat - float latitude in decimal degrees

lon - float longitude in decimal degrees

Returns:

boolean if lat is between 90 and -90, lon between 180 and -180;

forward

public java.awt.geom.Point2D forward(double lat,
                                     double lon,
                                     java.awt.geom.Point2D p,
                                     boolean isRadian)

Forward projects lat,lon into XY space and returns a Point2D.

Specified by:

forward in class GeoProj

Parameters:

lat - float latitude in radians

lon - float longitude in radians

p - Resulting XY Point2D

isRadian - bogus argument indicating that lat,lon arguments are in radians

Returns:

Point2D p

inverse

public <T extends java.awt.geom.Point2D> T inverse(double x,
                                                   double y,
                                                   T llp)

Inverse project x,y coordinates into a LatLonPoint.

Specified by:

inverse in interface Projection

Specified by:

inverse in class Proj

Parameters:

x - integer x coordinate

y - integer y coordinate

llp - LatLonPoint

Returns:

LatLonPoint llp

See Also:

Proj.inverse(Point2D)

getName

public java.lang.String getName()

Get the name string of the projection.

Specified by:

getName in interface Projection

Overrides:

getName in class Cylindrical

getXPixConstant

public double getXPixConstant()

Returns the x pixel constant of the projection. This was calculated when the projection was created. Represents the number of pixels around the earth (360 degrees).

Specified by:

getXPixConstant in interface EqualArc

getYPixConstant

public double getYPixConstant()

Returns the y pixel constant of the projection. This was calculated when the projection was created. Represents the number of pixels from 0 to 90 degrees.

Specified by:

getYPixConstant in interface EqualArc

convertProjection

public static LLXY convertProjection(Projection proj)