#include <windows.h>
#include <gl/gl.h>
#include <gl/glut.h>


int width = 400;
int height = 400;

void drawbox()
{
  glBegin(GL_QUADS);
    glVertex2f(0, 0);
    glVertex2f(1, 0);
    glVertex2f(1, 1);
    glVertex2f(0, 1);
  glEnd();
}

void draw ()
{
  glClear(GL_COLOR_BUFFER_BIT);

  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();

  // Perform Transformation
  glPushMatrix();
  glTranslatef(1, 1, 0);
  glRotatef(-45, 0, 0, 1);
  glScalef(2, 2, 0);

  // Draw Box
  glColor3f(1, 0, 0);
  drawbox();
  glPopMatrix();

  // Perform Transformation (reversed)
  glPushMatrix();
  glScalef(2, 2, 0);
  glRotatef(-45, 0, 0, 1);
  glTranslatef(1, 1, 0);

  // Draw Box
  glColor3f(0, 1, 0);
  drawbox();
  glPopMatrix();

  // Perform Transformation (proper rotation and scale)
  glPushMatrix();
  glScalef(2, 2, 0);
  glRotatef(-45, 0, 0, 1);
  glTranslatef(-0.5, -0.5, 0);

  // Draw Box
  glColor3f(0, 0, 1);
  drawbox();
  glPopMatrix();

  // Draw Origin
  glPointSize(5.0);
  glBegin(GL_POINTS);
    glColor3f(1, 1, 1);
    glVertex2f(0, 0);
  glEnd();

  glFlush();
}


int main (int argc, char **argv)
{
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);
  glutInitWindowSize(width, height);
  glutCreateWindow("Basic Transformation");

  glutDisplayFunc(draw);

  glMatrixMode(GL_PROJECTION);
  glOrtho(-4.0, 4.0, -4.0, 4.0, -1000, 1000);

  glutMainLoop();
  return 0;
}