#define GLUT_DISABLE_ATEXIT_HACK
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>

int screenWidth = 600;
int screenHeight = 600;

void display() {
    glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(0.0, 1.0, 0.0);
    glBegin(GL_LINE_LOOP);
        glVertex3f(100, 100, 0);
        glVertex3f(150, 100, 0);
        glVertex3f(150, 300, 0);
        glVertex3f(300, 300, 0);
        glVertex3f(300, 350, 0);
        glVertex3f(150, 350, 0);
        glVertex3f(150, 370, 0);
        glVertex3f(300, 370, 0);
        glVertex3f(300, 420, 0);
        glVertex3f(100, 420, 0);
    glEnd();
    glutSwapBuffers();
}

void reshape(int w, int h) {
    glViewport(0, 0, (GLsizei) w, (GLsizei) h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0.0, (GLdouble) w, 0.0, (GLdouble) h, 100, -100);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}

void keyboard(unsigned char key, int x, int y){
    switch (key){
        case 27 :
        case 'q':
            exit(0);
            break;
    }
}

int main(int argc, char *argv[]) {
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
    glutInitWindowSize(screenWidth, screenHeight);
    glutCreateWindow(argv[0]);
    glutDisplayFunc(display);
    glutReshapeFunc(reshape);
    glutKeyboardFunc(keyboard);
    glutMainLoop();
    return 0;
}