gov.nasa.worldwind.util
Class GeographicImageInterpolator.GeographicCell

java.lang.Object
  gov.nasa.worldwind.util.ImageInterpolator.Cell
      gov.nasa.worldwind.util.GeographicImageInterpolator.GeographicCell

All Implemented Interfaces:

Cacheable

Enclosing class:

GeographicImageInterpolator

protected static class GeographicImageInterpolator.GeographicCell
extends ImageInterpolator.Cell

GeographicCell extends ImageInterpolator.Cell to correctly handle image cells which have geographic coordinates. Unlike its superclass, which works in Cartesian coordinates, GeographicCell handles the singularities of geographic coordinates, such as image cells which cross the international dateline.

Field Summary

protected boolean

crossesDateline Denotes if the pixels in this geographic image cell crosses the international dateline.

Fields inherited from class gov.nasa.worldwind.util.ImageInterpolator.Cell

children, m0, m1, maxx, maxy, minx, miny, n0, n1

Constructor Summary

GeographicImageInterpolator.GeographicCell(int m0, int m1, int n0, int n1)
Constructs a new Geographic Cell, but otherwise does nothing.

Method Summary

protected boolean	childrenCrossDateline() Returns true if any of this image cell's children cross the international dateline, and false otherwise.
protected void	computeExtremesFromChildren() Overridden to correctly compute the extremes for parent cells who's children cross the international dateline.
protected void	computeExtremesFromLocations(Dimension dim, float[] xs, float[] ys) Overridden to correctly compute the extremes for leaf cells which cross the international dateline.
boolean	intersects(float x, float y) Overridden to correctly compute intersection for cells which cross the international dateline.
boolean	isCrossesDateline() Returns true if this image cell crosses the international dateline, and false otherwise.
protected boolean	longitudesCrossDateline(Dimension dim, float[] longitudes) Returns true if a line segment from the first pixel in this cell to any other pixel in this cell crosses the international dateline, and false otherwise.
protected ImageInterpolator.Cell	makeChildCell(int m0, int m1, int n0, int n1) Overridden to create a GeographicImageInterpolator.GeographicCell.

Methods inherited from class gov.nasa.worldwind.util.ImageInterpolator.Cell

build, computeBounds, getSizeInBytes, split

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

crossesDateline

protected boolean crossesDateline

Denotes if the pixels in this geographic image cell crosses the international dateline.

Constructor Detail

GeographicImageInterpolator.GeographicCell

public GeographicImageInterpolator.GeographicCell(int m0,
                                                  int m1,
                                                  int n0,
                                                  int n1)

Constructs a new Geographic Cell, but otherwise does nothing.

Parameters:

m0 - the cell's left image coordinate.

m1 - the cell's right image coordinate.

n0 - the cell's bottom image coordinate.

n1 - the cell's top image coordinate.

Method Detail

childrenCrossDateline

protected boolean childrenCrossDateline()

Returns true if any of this image cell's children cross the international dateline, and false otherwise. Returns false if this image cell has no children.

Returns:

true if any children cross the international dateline; false otherwise.

computeExtremesFromChildren

protected void computeExtremesFromChildren()

Overridden to correctly compute the extremes for parent cells who's children cross the international dateline. If the this cell does not cross the dateline, this invokes the superclass' functionality.

Overrides:

computeExtremesFromChildren in class ImageInterpolator.Cell

computeExtremesFromLocations

protected void computeExtremesFromLocations(Dimension dim,
                                            float[] xs,
                                            float[] ys)

Overridden to correctly compute the extremes for leaf cells which cross the international dateline. If this cell does not cross the dateline, this invokes the superclass' functionality.

Overrides:

computeExtremesFromLocations in class ImageInterpolator.Cell

Parameters:

dim - the image's dimensions.

xs - the x-coordinates of the image's pixels. Must contain at least gridSize.width * gridSize.height elements.

ys - the y-coordinates of the image's pixels. Must contain at least gridSize.width * gridSize.height elements.

intersects

public boolean intersects(float x,
                          float y)

Overridden to correctly compute intersection for cells which cross the international dateline. If the specified cell does not cross the dateline, this invokes the superclass' functionality.

Overrides:

intersects in class ImageInterpolator.Cell

Parameters:

x - the x-component to test for intersection with this cell.

y - the y-component to test for intersection with this cell.

Returns:

true if the (x, y) point intersects this cell; false otherwise.

isCrossesDateline

public boolean isCrossesDateline()

Returns true if this image cell crosses the international dateline, and false otherwise.

Returns:

true if this cell crosses the international dateline; false otherwise.

longitudesCrossDateline

protected boolean longitudesCrossDateline(Dimension dim,
                                          float[] longitudes)

Returns true if a line segment from the first pixel in this cell to any other pixel in this cell crosses the international dateline, and false otherwise.

Parameters:

dim - the image's dimensions.

longitudes - the longitude coordinates of the image's pixels in degrees. Must contain at least dim.width * dim.height elements.

Returns:

true if this image cell's crosses the international dateline; false otherwise.

makeChildCell

protected ImageInterpolator.Cell makeChildCell(int m0,
                                               int m1,
                                               int n0,
                                               int n1)

Overridden to create a GeographicImageInterpolator.GeographicCell.

Overrides:

makeChildCell in class ImageInterpolator.Cell

Parameters:

m0 - the cell's left image coordinate.

m1 - the cell's right image coordinate.

n0 - the cell's bottom image coordinate.

n1 - the cell's top image coordinate.

Returns:

a new GeographicCell with the specified image coordinates.