root/trunk/gdal/swig/csharp/apps/GDALGetHistogram.cs

/******************************************************************************
 * $Id: GDALOverviews.cs 13678 2008-02-02 23:29:37Z tamas $
 *
 * Name:     GDALOverviews.cs
 * Project:  GDAL CSharp Interface
 * Purpose:  A sample app to get the band histograms.
 * Author:   Tamas Szekeres, szekerest@gmail.com
 *
 ******************************************************************************
 * Copyright (c) 2007, Tamas Szekeres
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *****************************************************************************/

using System;

using OSGeo.GDAL;


/**

 * <p>Title: GDAL C# GDALGetHistogram example.</p>
 * <p>Description: A sample app to get the band histograms.</p>
 * @author Tamas Szekeres (szekerest@gmail.com)
 * @version 1.0
 */



/// <summary>
/// A C# based sample to get the band histograms.
/// </summary> 

class GDALGetHistogram {
        
        public static void usage() 

        { 
                Console.WriteLine("usage: gdalgethistogram {GDAL dataset name}");
                System.Environment.Exit(-1);
        }
 
    public static void Main(string[] args) 
    {
        if (args.Length < 1) usage();
        
        Console.WriteLine("");

        try 
        {
            /* -------------------------------------------------------------------- */
            /*      Register driver(s).                                             */
            /* -------------------------------------------------------------------- */
            Gdal.AllRegister();

            /* -------------------------------------------------------------------- */
            /*      Open dataset.                                                   */
            /* -------------------------------------------------------------------- */
            Dataset ds = Gdal.Open( args[0], Access.GA_ReadOnly );
                
            if (ds == null) 
            {
                Console.WriteLine("Can't open " + args[0]);
                System.Environment.Exit(-1);
            }

            Console.WriteLine("Raster dataset parameters:");
            Console.WriteLine("  Projection: " + ds.GetProjectionRef());
            Console.WriteLine("  RasterCount: " + ds.RasterCount);
            Console.WriteLine("  RasterSize (" + ds.RasterXSize + "," + ds.RasterYSize + ")");
           
 
            /* -------------------------------------------------------------------- */
            /*      Get the Histogram arrays                                        */
            /* -------------------------------------------------------------------- */
            for (int iBand = 1; iBand <= ds.RasterCount; iBand++) 
            {
                Console.WriteLine("Band " + iBand + ":");
                int[] histData = new int[256]; 
                Band band = ds.GetRasterBand(iBand);
                double pdfMin, pdfMax, pdfMean, pdfStdDev;
                band.GetStatistics(0, 1, out pdfMin, out pdfMax, out pdfMean, out pdfStdDev);
                Console.WriteLine("Min=" + pdfMin);
                Console.WriteLine("Max=" + pdfMax);
                Console.WriteLine("Mean=" + pdfMean);
                Console.WriteLine("StdDev=" + pdfStdDev);
                band.GetHistogram(-0.5, 255.5, 255, histData, 0, 1,
                           new Gdal.GDALProgressFuncDelegate(ProgressFunc), "");
                for (int i = 0; i < 255; i++)
                    Console.Write(String.Format(" {0:x}", histData[i]));
                Console.WriteLine("");
            }
            Console.WriteLine("Completed.");
        }
        catch (Exception e) 
        {
            Console.WriteLine("Application error: " + e.Message);
        }
    }

        public static int ProgressFunc(double Complete, IntPtr Message, IntPtr Data)
        {
                Console.Write("Processing ... " + Complete * 100 + "% Completed.");
                if (Message != IntPtr.Zero)
                        Console.Write(" Message:" + System.Runtime.InteropServices.Marshal.PtrToStringAnsi(Message));
                if (Data != IntPtr.Zero)
                        Console.Write(" Data:" + System.Runtime.InteropServices.Marshal.PtrToStringAnsi(Data));
        
                Console.WriteLine("");
                return 1;
        }
}