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1 /*
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2 * Copyright 2010 OpenSourceStewardshipFoundation.org
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3 * Licensed under GNU General Public License version 2
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4 *
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5 * Author: seanhalle@yahoo.com
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6 *
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7 */
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8
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9 #include "Histogram.h"
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10 #include <malloc.h>
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11
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12
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13 /*This Histogram Abstract Data Type has a number of bins plus a range of
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14 * values that the bins span, both chosen at creation.
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15 *
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16 *One creates a Histogram instance using the makeHistogram function, then
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17 * updates it with the addToHist function, and prints it out with the
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18 * printHist function.
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19 *
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20 *Note, the bin width is an integer, so the end of the range is adjusted
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21 * accordingly. Use the bin-width to calculate the bin boundaries.
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22 */
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23
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24
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25 Histogram *
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26 makeHistogram( int numBins, int startOfRange, int endOfRange )
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27 {
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28 Histogram *hist;
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29 int i;
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30
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31 hist = malloc( sizeof(Histogram) );
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32 hist->bins = malloc( numBins * sizeof(int) );
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33
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34 hist->numBins = numBins;
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35 hist->binWidth = (endOfRange - startOfRange) / numBins;
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36 hist->endOfRange = startOfRange + hist->binWidth * numBins;
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37 hist->startOfRange = startOfRange;
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38
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39 for( i = 0; i < hist->numBins; i++ )
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40 {
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41 hist->bins[ i ] = 0;
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42 }
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43
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44 return hist;
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45 }
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46
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47 void
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48 addToHist( int value, Histogram *hist )
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49 {
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50 int binIdx;
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51
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52 if( value < hist->startOfRange )
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53 { binIdx = 0;
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54 }
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55 else if( value > hist->endOfRange )
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56 { binIdx = hist->numBins - 1;
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57 }
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58 else
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59 {
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60 binIdx = (value - hist->startOfRange) / hist->binWidth;
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61 }
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62
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63 hist->bins[ binIdx ] += 1;
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64 }
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65
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66 void
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67 printHist( Histogram *hist )
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68 {
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69 int binIdx, i, numBars, maxHeight, barValue, binStart, binEnd;
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70
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71 maxHeight = 0;
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72 for( i = 0; i < hist->numBins; i++ )
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73 {
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74 if( maxHeight < hist->bins[ i ] ) maxHeight = hist->bins[ i ];
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75 }
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76 barValue = maxHeight / 60; //60 spaces across page for tallest bin
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77
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78 printf("histogram: \n");
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79 if( barValue == 0 ) printf("error printing histogram\n");
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80 for( binIdx = 0; binIdx < hist->numBins; binIdx++ )
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81 {
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82 binStart = hist->startOfRange + hist->binWidth * binIdx;
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83 binEnd = binStart + hist->binWidth - 1;
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84 printf("bin range: %d - %d", binStart, binEnd );
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85
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86 numBars = hist->bins[ binIdx ] / barValue;
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87 //print one bin, height of bar is num dashes across page
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88 for( i = 0; i < numBars; i++ )
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89 {
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90 printf("-");
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91 }
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92 printf("\n");
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93 }
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94 }
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95
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