Notes

#include <GL/glut.h>

void display(void)

{

//Clear all pixels

glClear(GL_COLOR_BUFFER_BIT);

//draw white polygon (rectangle) with corners at

// (0.25, 0.25, 0.0) and (0.75, 0.75, 0.0)

glColor3f(1.0,1.0,1.0);

glBegin(GL_POLYGON);

//glVertex3f(0.25, 0.25, 0.0);
//glVertex3f(0.35, 0.15, 0.0);
// glVertex3f(0.55, 0.75, 0.0);

//glVertex3f(0.95, 0.25, 0.0);

// glVertex3f(0.25, 0.75, 0.0);

glVertex3f(0.1, 0.1, 0.0);
glVertex3f(0.2, 0.1, 0.0);
glVertex3f(0.2, 0.4, 0.0);

glEnd();



// Don't wait start processing buffered OpenGL routines

glFlush();

}

void init(void)

{

//select clearing (background) color

glClearColor(0.0, 0.0, 0.0, 0.0);

//initialize viewing values

glMatrixMode(GL_PROJECTION);

glLoadIdentity();

glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);

}

int main(int argc, char** argv)

{

//Initialise GLUT with command-line parameters.

glutInit(&argc, argv);



//Set Display Mode

glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);



//Set the window size

glutInitWindowSize(250,250);



//Set the window position

glutInitWindowPosition(100,100);



//Create the window

glutCreateWindow("A Simple OpenGL Windows Application with GLUT");



//Call init (initialise GLUT

init();



//Call "display" function

glutDisplayFunc(display);



//Enter the GLUT event loop

glutMainLoop();

return 0;

}