topography.cc

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/* -*-  Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
 * Copyright (c) 1997 Regents of the University of California.
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 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *  This product includes software developed by the Computer Systems
 *  Engineering Group at Lawrence Berkeley Laboratory.
 * 4. Neither the name of the University nor of the Laboratory may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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/* Ported from CMU/Monarch's code, nov'98 -Padma.*/

#include <math.h>
#include <stdlib.h>

#include "object.h"

#include "dem.h"
#include "topography.h"


static class TopographyClass : public TclClass {
public:
        TopographyClass() : TclClass("Topography") {}
        TclObject* create(int, const char*const*) {
                return (new Topography);
        }
} class_topography;


double
Topography::height(double x, double y) {

    if(grid == 0)
        return 0.0;

#ifndef WIN32
    int a = (int) rint(x/grid_resolution);
    int b = (int) rint(y/grid_resolution);
    int c = (int) rint(maxY);
#else 
    int a = (int) ceil(x/grid_resolution+0.5);
    int b = (int) ceil(y/grid_resolution+0.5);
    int c = (int) ceil(maxY+0.5);
#endif /* !WIN32 */

    return (double) grid[a * c + b];
}


int
Topography::load_flatgrid(int x, int y, int res)
{
    /* No Reason to malloc a grid */

    grid_resolution = res;  // default is 1 meter
    maxX = (double) x;
    maxY = (double) y;

    return 0;
}


int
Topography::load_demfile(const char *fname)
{
    DEMFile *dem;

    fprintf(stderr, "Opening DEM file %s...\n", fname);

    dem = new DEMFile((char*) fname); 
    if(dem == 0)
        return 1;

    fprintf(stderr, "Processing DEM file...\n");

    grid = dem->process();
    if(grid == 0) {
        delete dem;
        return 1;
    }
    dem->dump_ARecord();

    double tx, ty; tx = maxX; ty = maxY;
    dem->range(tx, ty);         // Get the grid size
    maxX = tx; maxY = ty;

    dem->resolution(grid_resolution);   // Get the resolution of each entry

    /* Close the DEM file */
    delete dem;

    /*
     * Sanity Check
     */
    if(maxX <= 0.0 || maxY <= 0.0 || grid_resolution <= 0.0)
        return 1;

    fprintf(stderr, "DEM File processing complete...\n");

    return 0;
}


void 
Topography::updateNodesList(class MobileNode* mn, double oldX)
{
    channel_->updateNodesList(mn, oldX);
}


int
Topography::command(int argc, const char*const* argv)
{
    if(argc == 3) {

        if(strcmp(argv[1], "load_demfile") == 0) {
            if(load_demfile(argv[2]))
                return TCL_ERROR;
            return TCL_OK;
        } else if (strcmp(argv[1], "channel") == 0) {
            WirelessChannel *chan;
            chan = (WirelessChannel *)TclObject::lookup(argv[2]);
            if (chan == 0) {
                fprintf(stderr, "%s lookup of channel failed\n", argv[1]);
                return TCL_ERROR;
            } else {
                channel_ = chan;
                return TCL_OK;
            }
        }
    }
    else if(argc == 4) {
        if(strcmp(argv[1], "load_flatgrid") == 0) {
            if(load_flatgrid(atoi(argv[2]), atoi(argv[3])))
                return TCL_ERROR;
            return TCL_OK;
        }
    }
    else if(argc == 5) {
        if(strcmp(argv[1], "load_flatgrid") == 0) {
            if(load_flatgrid(atoi(argv[2]), atoi(argv[3]), atoi(argv[4])))
                return TCL_ERROR;
            return TCL_OK;
        }
    }
    return TclObject::command(argc, argv);
}

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