//Compile gcc <filename> -lGL -lglut

#include <iostream>
#include <GL/glut.h>

using namespace std;

void bold2DPoint(float x, float y){
    glBegin(GL_POINTS);
        glVertex2f(x  , y  );
        glVertex2f(x  , y+1);
        glVertex2f(x+1, y  );
        glVertex2f(x+1, y+1);
    glEnd();
}

void QR(){
    matrix [i][j] = {0};
    for (int i = 0; i < 25; i+=2){
        for (int j = 0; j < 25; j+=2){
            if (matrix[i][j] == 1){
                bold2DPoint(i, -1*j);
            }
        }
    }
}

void display(){
    glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(0.0, 0.0, 0.0);
    QR();
    glFlush();
}

void init(){
    glClearColor(1.0, 1.0, 1.0, 1.0);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(-400, 400, -400, 400, -1.0, 1.0);
}

int main(int argc, char** argv){
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
    glutInitWindowSize(800,800);
    glutInitWindowPosition(100,100);
    glutCreateWindow("QR Code Generator");
    init();
    glutDisplayFunc(display);
    glutMainLoop();
    return 0;
}