integrator.cc

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/* -*-  Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
 * Copyright (c) 1996 Regents of the University of California.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 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 MASH Research
 *  Group at the University of California Berkeley.
 * 4. Neither the name of the University nor of the Research Group may be
 *    used to endorse or promote products derived from this software without
 *    specific prior written permission.
 * 
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 */

#ifndef lint
static const char rcsid[] =
    "@(#) $Header: /nfs/jade/vint/CVSROOT/ns-2/tools/integrator.cc,v 1.8 1998/06/27 01:23:57 gnguyen Exp $";
#endif

#include <stdlib.h>
#include "integrator.h"

static class IntegratorClass : public TclClass {
 public:
    IntegratorClass() : TclClass("Integrator") {}
    TclObject* create(int, const char*const*) {
        return (new Integrator);
    }
} integrator_class;

Integrator::Integrator() : lastx_(0.), lasty_(0.), sum_(0.)
{
    bind("lastx_", &lastx_);
    bind("lasty_", &lasty_);
    bind("sum_", &sum_);
}

void Integrator::set(double x, double y)
{
    lastx_ = x;
    lasty_ = y;
    sum_ = 0.;
}

void Integrator::newPoint(double x, double y)
{
    sum_ += (x - lastx_) * lasty_;
    lastx_ = x;
    lasty_ = y;
}

int Integrator::command(int argc, const char*const* argv)
{
    if (argc == 2) {
        if (strcmp(argv[1], "reset") == 0) {
            set(0., 0.);
            return (TCL_OK);
        }
    } else if (argc == 4) {
        if (strcmp(argv[1], "newpoint") == 0) {
            double x = atof(argv[2]);
            double y = atof(argv[3]);
            newPoint(x, y);
            return (TCL_OK);
        }
    }
    return (TclObject::command(argc, argv));
}

/*
 * interface for the 'Samples' class, will probably want to move
 * to some sort of "stats" file at some point
 */
static class SamplesClass : public TclClass {
 public:
    SamplesClass() : TclClass("Samples") {}
    TclObject* create(int, const char*const*) {
        return (new Samples);
    }
} samples_class;

int Samples::command(int argc, const char*const* argv)
{
    if (argc == 2) {
        if (strcmp(argv[1], "mean") == 0) {
            if (cnt_ > 0) {
                Tcl::instance().resultf("%g", mean());
                return (TCL_OK);
            }
            Tcl::instance().resultf("tried to take mean with no sample points");
            return (TCL_ERROR);
        }
        if (strcmp(argv[1], "cnt") == 0) {
            Tcl::instance().resultf("%u", cnt());
            return (TCL_OK);
        }
        if (strcmp(argv[1], "variance") == 0) {
            if (cnt_ == 1) {
                Tcl::instance().resultf("0.0");
                return (TCL_OK);
            }
            if (cnt_ > 2) {
                Tcl::instance().resultf("%g", variance());
                return (TCL_OK);
            }
            return (TCL_ERROR);
        }
        if (strcmp(argv[1], "reset") == 0) {
            reset();
            return (TCL_OK);
        }
    } else if ( argc == 3 ) {
        if ( strcmp(argv[1],"newpoint") == 0 ) {
            double x = atof(argv[2]);
            newPoint(x);
            return (TCL_OK);
        }
    }
    return (TclObject::command(argc, argv));
}

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