Eigene Dateien/uni/visualisierung/vislu/bsp1/VisLu/VHistogram.cpp

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#include "VHistogram.h"
#include <algorithm>
#include <vector>
#include <math.h>
#include <GL/glew.h>
#include <GL/glut.h>
#include <iostream>

using namespace std;

VHistogram::VHistogram(int * hist,int length,int x,int y,int width,int height)
{
        this->hist = hist;
        this->length = length;
        this->width = width;
        this->height = height;
        this->x = x;
        this->y = y;
        int k = (int)ceil((double)this->length/this->width);
        for(int i=1; i<this->length-k+1; i+=k) {//start on 1 to avoid outliers
                int sum = 0;
                for(int j=i; j<i+k; j++) {
                        sum+=this->hist[j];
                }
                this->clamped_hist.push_back(sum);
        }
        this->peak = *max_element(this->clamped_hist.begin(),this->clamped_hist.end());
        for(vector<int>::iterator it = this->clamped_hist.begin(); it!=this->clamped_hist.end(); it++) {
                (*it) = (int)ceil(((double)(*it)*this->height/this->peak));
        }
}

void VHistogram::draw() {
        glBegin(GL_LINES);
                int i = 0;
                for(vector<int>::iterator it = this->clamped_hist.begin(); it!=this->clamped_hist.end(); it++) {
                        glVertex2f(x+i,y+this->height);
                        glVertex2f(x+i,y+this->height-(*it));
                        i++;
                }
        glEnd();
}

VHistogram::~VHistogram(void)
{
        delete this->hist;
        this->clamped_hist.clear();
}

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