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


using namespace std;

void drawLine();

void CoordinateAxes();
void plot(float x, float y);




float x, y, dx, dy, D1, D2, xInc, yInc;
int arraySize;
static int step;


int main(int argc, char** argv)
{


    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB);
    glutInitWindowPosition(100, 100);
    glutInitWindowSize(500,500);

    glutCreateWindow("DDA Algorithm");
    glutDisplayFunc(drawLine);

    glutMainLoop();
    return 0;
}

void drawLine()
{

    CoordinateAxes();
    glColor3ub(255 ,255,255);
    glBegin(GL_LINES);
        plot(0,0);
         plot(0,100);
         plot(100,100);
         plot(100,0);
    glEnd();
    glFlush();
}


void CoordinateAxes()
{
    glColor3ub(0,0,255);
    glBegin(GL_LINES);
        glVertex2f(0,1);
        glVertex2f(0,-1);
        glVertex2f(-1,0);
        glVertex2f(1,0);
    glEnd();
}

void plot(float x, float y)
{
    glVertex2f(x/500, y/500);
    cout << "(" << x << "," << y << ")";
}