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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 #include <stdio.h>
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9 #include "Histogram.h"
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10
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11
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12 /*This Histogram Abstract Data Type has a number of bins plus a range of
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13 * values that the bins span, both chosen at creation.
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14 *
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15 *One creates a Histogram instance using the makeHistogram function, then
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16 * updates it with the addToHist function, and prints it out with the
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17 * printHist function.
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18 *
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19 *Note, the bin width is an integer, so the end of the range is adjusted
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20 * accordingly. Use the bin-width to calculate the bin boundaries.
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21 */
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22
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23
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24 Histogram *
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25 makeHistogram( int numBins, int startOfRange, int endOfRange )
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26 {
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27 Histogram *hist;
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28 int i;
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29
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30 hist = VMS__malloc( sizeof(Histogram) );
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31 hist->bins = VMS__malloc( numBins * sizeof(int) );
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32
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33 hist->numBins = numBins;
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34 hist->binWidth = (endOfRange - startOfRange) / numBins;
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35 hist->endOfRange = startOfRange + hist->binWidth * numBins;
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36 hist->startOfRange = startOfRange;
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37
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38 for( i = 0; i < hist->numBins; i++ )
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39 {
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40 hist->bins[ i ] = 0;
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41 }
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42
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43 return hist;
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44 }
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45
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46 void
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47 addToHist( int value, Histogram *hist )
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48 {
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49 int binIdx;
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50
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51 if( value < hist->startOfRange )
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52 { binIdx = 0;
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53 }
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54 else if( value > hist->endOfRange )
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55 { binIdx = hist->numBins - 1;
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56 }
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57 else
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58 {
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59 binIdx = (value - hist->startOfRange) / hist->binWidth;
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60 }
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61
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62 hist->bins[ binIdx ] += 1;
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63 }
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64
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65 void
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66 printHist( Histogram *hist )
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67 {
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68 int binIdx, i, numBars, maxHeight, barValue, binStart, binEnd;
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69
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70 maxHeight = 0;
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71 for( i = 0; i < hist->numBins; i++ )
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72 {
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73 if( maxHeight < hist->bins[ i ] ) maxHeight = hist->bins[ i ];
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74 }
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75 barValue = maxHeight / 60; //60 spaces across page for tallest bin
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76
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77 printf( "histogram: \n" );
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78 if( barValue == 0 ) printf("error printing histogram\n");
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79 for( binIdx = 0; binIdx < hist->numBins; binIdx++ )
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80 {
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81 binStart = hist->startOfRange + hist->binWidth * binIdx;
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82 binEnd = binStart + hist->binWidth - 1;
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83 printf("bin range: %d - %d", binStart, binEnd );
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84
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85 numBars = hist->bins[ binIdx ] / barValue;
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86 //print one bin, height of bar is num dashes across page
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87 for( i = 0; i < numBars; i++ )
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88 {
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89 printf("-");
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90 }
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91 printf("\n");
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92 }
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93 }
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94
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95 void
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96 freeHist( Histogram *hist )
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97 {
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98 VMS__free( hist->bins );
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99 VMS__free( hist );
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100 }
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