OpenGL Graphics Code: Build a house with GLUT

#include <windows.h>
#include <GL\glut.h>

void myInit (void)

{

     glClearColor(0.0,0.0,0.0,0.0); // sets background color to white

     // sets a point to be 4x4 pixels

     glMatrixMode(GL_PROJECTION);

     glLoadIdentity();

     gluOrtho2D(0.0, 500.0, 0.0, 400.0); // the display area in world coordinates.

}


void myDisplay(void)

{

     glClear(GL_COLOR_BUFFER_BIT); // clears the screen
    glColor3f(0.5f,0.5f,0.5f) ;// setsthe drawing colour

     glPointSize(4.0);

     glBegin(GL_POLYGON);
//bottom

          glVertex2i (20, 20);
          glVertex2i (320, 20);

          //top
          glVertex2i (20, 200);
          glVertex2i (320, 200);
        //left
          glVertex2i (20, 200);
          glVertex2i (20, 20);
        //right
          glVertex2i (320, 200);
          glVertex2i (320, 20);

          //glVertex2i (10, -50);

    glEnd();


//Left Window

 glColor3f(1.0f,0.0f,0.0f) ;
glPointSize(4.0);
 glRectf(30,30,100,100);

 //Right Window
 glColor3f(1.0f,0.0f,0.0f) ;
glBegin(GL_POLYGON);
//bottom

        glVertex2i (200,30);
          glVertex2i (200, 100);

//top
          glVertex2i (200, 100);
          glVertex2i (300, 100);

//left
          glVertex2i (300, 100);
          glVertex2i (300, 30);
 //right
         glVertex2i (300, 30);
          glVertex2i (200, 30);

          //glVertex2i (10, -50);

    glEnd();


//door
glColor3f(0.0f,0.0f,1.0f) ;
glBegin(GL_POLYGON);
//left

        glVertex2i (120,30);
          glVertex2i (120, 100);

//top
          glVertex2i (120, 100);
          glVertex2i (170, 100);

//right
          glVertex2i (170, 100);
          glVertex2i (170, 30);

 //bottom
         glVertex2i (120, 30);
          glVertex2i (170, 30);

          //glVertex2i (10, -50);

    glEnd();

    //Triangle

    glColor3f(0.0f,1.0f,0.0f) ;
    glBegin(GL_POLYGON);
//bottom

          glVertex2i (20, 200);
          glVertex2i (320, 200);

          //top
          glVertex2i (200, 310);
          glVertex2i (320, 200);

        //left
          glVertex2i (20, 200);
          glVertex2i (200, 310);


          //glVertex2i (10, -50);

    glEnd();




     glFlush(); // sends all output to display;

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

     glutInit (&argc, argv); // to initialize the toolkit;

     glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB); // sets the display mode

     glutInitWindowSize (640, 480); // sets the window size

     glutInitWindowPosition (10, 10); // sets the starting position for the window

     glutCreateWindow ("My first OpenGL program!"); // creates the window and sets the title

     glutDisplayFunc (myDisplay);
     myInit(); // additional initializations as necessary
     glutMainLoop(); // go into a loop until event occurs
     return 0;
}

Screenshot: