#ifdef __APPLE__
#include <GLUT/glut.h>
#else
#include <GL/glut.h>
#endif

using namespace std;

int h=400, w=400, x_=w/2, y_=h/2, cl=0;
bool l=true;

void display()
{
  if (cl==0) glColor3d(1, 0, 0);
  if (cl==1) glColor3d(0, 1, 0);
  if (cl==2) glColor3d(0, 0, 1);
  glBegin(GL_POLYGON);
  glVertex2d(x_, y_);
  glVertex2d(x_+5, y_);
  glVertex2d(x_+5, y_+5);
  glVertex2d(x_, y_+5);
  glEnd();
  if (l) glFlush();
}

void MousePressed(int button, int state, int ax, int ay)
{
    if (state)
    {
    if (button==GLUT_LEFT_BUTTON) cl=(cl+1)%3;
    else if (button==GLUT_LEFT_BUTTON) cl=(cl+2)%3;
    display();
    }
}

void Keyboard(unsigned char key, int x, int y)
{
    if (key=='a') x_=x_-5;
    else if (key=='w') y_=y_+5;
    else if (key=='d') x_=x_+5;
    else if (key=='s') y_=y_-5;
    else if (key=='m') l=not l;
    display();
}

int main (int argc, char *argv[])
{
      glutInit(&argc, argv);
      glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
      glutInitWindowSize(w, h);
      glutCreateWindow("fallout 4");
      gluOrtho2D(0, w, 0, h);
      glutDisplayFunc(display);
      glutKeyboardFunc(Keyboard);
      glutMouseFunc(MousePressed);
      glutMainLoop();
}