/*
 * Copyright (C) Artsiom D.
 * Copyright (C) shit-co.de
 */


#include <stdlib.h>
#include <string.h>

#include "chart.h"
#include "util.h"


struct chart
new_chart(unsigned int length)
{
    unsigned int  i;
    double        price;
    struct chart  chart;

    chart.prices = emalloc(sizeof(double) * length);
    chart.length = length;

    /* populate with random prices */

    price = 10;
    
    for (i = 0; i < length; i++) {
        chart.prices[i] = price;
        price += (double)rand() / RAND_MAX * 4 - 2;
    }

    return chart;
}


void
update_chart(struct chart *chart)
{
    memmove(chart->prices, chart->prices + 1, (chart->length - 1) * sizeof(double));
    chart->prices[chart->length - 1] = chart->prices[chart->length - 2] + (double)rand() / RAND_MAX * 4 - 2;
}