Notes

#include <GL/glut.h>

void init2D(float r, float g, float b)
{
// glClearColor sets the colour to clear the
//buffer to.
glClearColor(r, g, b, 0.0);
// used to set up the view volume,
//GL_MODELVIEW can be used to set up viewing
//transformation
glMatrixMode(GL_PROJECTION);
// gluOrtho2D specifies the coordinates to
//be used with the viewport which defaults to the
//window size.
gluOrtho2D(-50.0, 50.0, -50.0, 50.0);
}

void drawSquare()
{
glBegin(GL_QUADS);
glVertex3f(-35.0f, -35.0f, 0.0f);
glVertex3f(-5.0f, -35.0f, 0.0f);
glVertex3f(-5.0f, -5.0f, 0.0f);
glVertex3f(-35.0f, -5.0f, 0.0f);
glEnd();
}

void display(void)
{
// clear the buffers currently enabled for
//color writing.
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(0.0, 0.0, 0.0);
drawSquare();
glPushMatrix();
GLdouble translate[16] = {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1};
glMultMatrixd(translate);
//display();
// glBegin(GL_QUADS);
// glVertex3f(-35.0f, -35.0f, 0.0f);
// glVertex3f(-5.0f, -35.0f, 0.0f);
// glVertex3f(-5.0f, -5.0f, 0.0f);
// glVertex3f(-35.0f, -5.0f, 0.0f);
// glEnd();
glPopMatrix();
glFlush();
}

int main(int argc, char *argv[])
{
// glutInit will initialize the GLUT library and
//negotiate a session with the window system.
glutInit(&argc,argv);
// Select a display mode with single buffer
//because its a simple application and Red, green,
//blue framebuffer
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutInitWindowSize(500, 500);
glutInitWindowPosition(100, 100);
glutCreateWindow("Square");
init2D(10.0, 10.0, 10.0);
// calls the function display every/time the
//display needs to be updated
glutDisplayFunc(display);
glutMainLoop();
return 0;
}