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World Wind is a collection of components that interactively display 3D geographic information within Java applications or applets.
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/*
 * Copyright (C) 2012 United States Government as represented by the Administrator of the
 * National Aeronautics and Space Administration.
 * All Rights Reserved.
 */
package gov.nasa.worldwind.data;

import gov.nasa.worldwind.Disposable;
import gov.nasa.worldwind.avlist.AVList;
import gov.nasa.worldwind.geom.Sector;

// TODO: Document the conditions determining when the sub-raster methods would fail and its response when the input
// sector is not fully within the raster's sector. Also do so appropriately in the implementing classes.
// What's the response from getSubRegion if a necessary projection can't be performed?

/**
 * Represents a raster of imagery or elevations.
 *
 * @author dcollins
 * @version $Id: DataRaster.java 1171 2013-02-11 21:45:02Z dcollins $
 */
public interface DataRaster extends AVList, Disposable
{
    /**
     * Returns the raster's width in raster units.
     *
     * @return the raster's width in raster units.
     */
    int getWidth(); // TODO: what's returned if the raster is invalid or the width is unknown?

    /**
     * Returns the raster's height in raster units.
     *
     * @return the raster's height in raster units.
     */
    int getHeight(); // TODO: what's returned if the raster is invalid or the width is unknown?

    /**
     * Returns the region covered be the data.
     *
     * @return a sector indicating the region covered by the raster.
     */
    Sector getSector(); // TODO: what's returned if the raster is invalid or the sector is unknown?

    /**
     * Copies this raster into a specified raster.
     *
     * @param canvas - the raster to copy into.
     */
    void drawOnTo(DataRaster canvas);

    /**
     * Returns a portion of this raster as another raster. Input values are the desired width and height of the return
     * sub-raster, and the sector to copy from this raster to the sub-raster. The returned raster conforms to EPSG:4326
     * even if this raster does not.
     *
     * @param params a list of parameters that specify the width, height and sector of the region to return. Specify
     *               these values using {@link gov.nasa.worldwind.avlist.AVKey#WIDTH}, {@link
     *               gov.nasa.worldwind.avlist.AVKey#HEIGHT} and {@link gov.nasa.worldwind.avlist.AVKey#SECTOR}.
     *
     * @return the requested raster, or null if the raster could not be created.
     *
     * @throws IllegalArgumentException if the specified parameter list is missing the width, height or sector keys or
     *                                  any of those values are invalid.
     */
    DataRaster getSubRaster(AVList params);

    /**
     * Returns a portion of this raster as another raster. The returned raster conforms to EPSG:4326 even if this raster
     * does not.
     *
     * @param width  the width to make the returned sub-raster.
     * @param height the height to make the returned sub-raster.
     * @param sector the sector to copy.
     * @param params a list of parameters that specify the width, height and sector of the region to return. Specify
     *               these values using {@link gov.nasa.worldwind.avlist.AVKey#WIDTH}, {@link
     *               gov.nasa.worldwind.avlist.AVKey#HEIGHT} and {@link gov.nasa.worldwind.avlist.AVKey#SECTOR}.
     *
     * @return the requested raster, or null if the raster could not be created.
     *
     * @throws IllegalArgumentException if the sector is null or the width, height or sector are invalid.
     */
    DataRaster getSubRaster(int width, int height, Sector sector, AVList params);
}