#include "Lines.h"
#include <cmath>
#include <iostream>
using namespace std;

void Lines::SetNumber(int count) {
    num = count;
    if (num < 3 or num > 300000) {
        num = 300;
    }
    return;
}
void Lines::Init()  {
    int i;
    Vertex v;
    float theta;
    float dTheta;

    dTheta = 2*M_PI / (num);

    // initial point is the origin.
    v.position[0] = 0;
    v.position[1] = 0;
    v.color[0] = 0;
    v.color[0] = 0;
    v.color[0] = 0;
    points.push_back(v);

    theta = 0;
    for(i=0;i<num;i++) {
       v.position[0] = 0.9 * cos(theta);
       v.position[1] = 0.9 * sin(theta);
       theta += dTheta ;

       v.color[0] = rand()/float(RAND_MAX);
       v.color[1] = rand()/float(RAND_MAX);
       v.color[2] = rand()/float(RAND_MAX);

       // add the point to the list
       points.push_back(v);

       // add the index for the line to the list.
       index.push_back(0);
       index.push_back(ushort(points.size()-1));
    }
}