// **********************************************************************// // <copyright>// //  BBN Technologies//  10 Moulton Street//  Cambridge, MA 02138//  (617) 873-8000// //  Copyright (C) BBNT Solutions LLC. All rights reserved.// // </copyright>// **********************************************************************// // $Source: /cvs/distapps/openmap/src/openmap/com/bbn/openmap/omGraphics/grid/ElevationBandGenerator.java,v $// $RCSfile: ElevationBandGenerator.java,v $// $Revision: 1.1.2.1 $// $Date: 2005/12/22 18:42:47 $// $Author: dietrick $// // **********************************************************************package com.bbn.openmap.omGraphics.grid;import com.bbn.openmap.proj.Length;/** * The ElevationBandGenerator is an OMGridGenerator that creates an OMRaster out * of OMGrid data. The OMgrid data is assumed to be meter elevation points, and * the colors given to the pixels in the raster reflect the values as dictated * by the Length units. The colortable given to the generator determines the * colors used, and the band height sets the elevation range for each color. */public class ElevationBandGenerator extends SimpleColorGenerator {    public static final int DEFAULT_BANDHEIGHT = 100;    public static final int DEFAULT_ADJUST = 3;    /**     * The colors to use. The colors[0] is assumed to be the 0 elevation color,     * and by default, is a light blue color.     */    protected int[] colors;    /**     * A number between 1-5 to adjust the contrast a little between the colors.     */    protected int adjust = DEFAULT_ADJUST;    /**     * The elevation difference between the edges of a color - or how much the     * elevation must change before a pixel gets the next color.     */    protected int bandHeight = DEFAULT_BANDHEIGHT; // meters    protected Length dataUnits = Length.METER;    protected Length displayUnits = Length.METER;    public ElevationBandGenerator() {        setColortable(createGreyscaleColors(216, 255));    }    /**     * Takes the value assigned to a pixel, as determined by it's location in     * the grid, and gives it a color to be painted by. In this case, the pixel     * is colored according to the elevation value.     *      * @param source a grid point value assigned to the raster pixel.     * @return the ARGB to color the pixel.     */    public int calibratePointValue(int source) {        if (source < -500) {            return 0; // clear, nothing is that low...        }        if (source == 0) {            return colors[0]; // water blue, assumed.        }        if (displayUnits != dataUnits) {            source = (int) displayUnits.fromRadians(dataUnits.toRadians(source));        }                // I'm not really sure how all this works out - I wrote it a        // while ago, and it works, so I'm leaving well enough alone.        // Some notes from before:        // Start at the darkest color, and then go up through the        // colormap for each band height, the start back at the        // darkest when you get to the last color. To make this        // more useful, I limit the number of colors (10) used - if        // there isn;t enough contrast between the colors, you can't        // see the bands. The contrast adjustment in 24-bit color        // mode(216 colors) lets you add a few colors.        int assignment = (int) (((source / bandHeight)                % (10 - 2 * (3 - adjust)) * (colors.length / (10 - 2 * (3 - adjust)))) + 6);        return colors[assignment];    }    public void setColortable(int[] colors) {        this.colors = colors;    }    public int[] getColortable() {        return colors;    }        public void setColors(ElevationColors ec) {        setColortable(ec.getColortable());    }    public void setBandHeight(int height) {        if (height <= 0)            height = DEFAULT_BANDHEIGHT;        bandHeight = height;    }    public int getBandHeight() {        return bandHeight;    }    public void setAdjust(int value) {        if (value <= 0 || value > 5)            value = DEFAULT_ADJUST;        adjust = value;    }    public int getAdjust() {        return adjust;    }    public Length getDataUnits() {        return dataUnits;    }    public void setDataUnits(Length units) {        this.dataUnits = units;    }    public Length getDisplayUnits() {        return displayUnits;    }    public void setDisplayUnits(Length displayUnits) {        this.displayUnits = displayUnits;    }}