// Spiral Thing
// By: Chdata
#include "stdafx.h"
#include <iostream>
#include <Windows.h>
#include <glut.h>

#include <WinBase.h>
#include <cstdlib>
#include <ctime>

const int XSize = 640, YSize = XSize/4*3, winsize = XSize * YSize;

void circul(float xcenter, float ycenter, float a, float b, float r)
{
float pi = 3.1415926f;
float dtr = pi/180.0f;
    glBegin(GL_LINES);
    glColor3f(rand()&1,rand()&1,rand()&1); //glColor3f(0.0f,0.0f,1.0f

    float x = xcenter + r * cos(a); //* pi/180.0f
    float y = ycenter + r * -sin(a);

    for(a; a < b; a+=dtr)
    {
        glVertex2f(x,y);
        x = xcenter + r * cos(a);
        y = ycenter + r * -sin(a);
        glVertex2f(x,y);
    }
    glEnd();
    glutSwapBuffers();
}

void display(void)
{
    float a = 0.0f;
    float b = 0.03125f;
    float e = 0.5f;
    float f = e + b;
    float g = 1.0f;
    float h = g + b;
    float j = 1.5f;
    float k = j + b;
    float step = b;
    float pi = 3.1415926f;
    float x = XSize/2;
    float y = YSize/2;
    float d = 0.0f;
    float r = 191.0f;

    while (true)
    {
        while (d<r)
        {
            circul(x, y, a * pi, b * pi, d * 2);
            circul(x, y, e * pi, f * pi, d * 2);
            circul(x, y, g * pi, h * pi, d * 2);
            circul(x, y, j * pi, k * pi, d * 2);
            a += step;
            b += step;
            e += step;
            f += step;
            g += step;
            h += step;
            j += step;
            k += step;
            if (a>=2) a-=2;
            if (b> 2) b-=2;
            if (e>=2) e-=2;
            if (f> 2) f-=2;
            if (g>=2) g-=2;
            if (h> 2) h-=2;
            if (j>=2) j-=2;
            if (k> 2) k-=2;
            d++;
            Sleep(182);
        }

        if (d=r) d=0;
        //Sleep(182);
        //if (!d) glClear(GL_COLOR_BUFFER_BIT);
    }

    /*
    float a = 0.0f, b = 0.0f; //, r = 0.0f;
    float x = XSize/2, y = YSize/2;
    float pi = 3.1415926f;
    float dtr = pi/180.0f;
    for(float r = 0.0f; r < 192.0f; r++)
    {
        b += 1.875f;
        circul(x, y, a, b * dtr, r);
        glClear(GL_COLOR_BUFFER_BIT);
    }
    */
}

void init(void)
{
    glMatrixMode (GL_PROJECTION);
    glLoadIdentity ();
    glOrtho (0, XSize, YSize, 0, 0, 1);
    glMatrixMode (GL_MODELVIEW);
}

int _tmain(int argc, char **argv )
{
    srand((unsigned int)time(NULL));
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
    glutInitWindowSize(XSize, YSize);
    glutCreateWindow("Brought to you by:");
    glutDisplayFunc(display);
    init();
    glutMainLoop();
    return 0;
}