#include <gl/glut.h>
void display()
{
glClearColor(0,0,0,0);
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1,0,0);
//Set point size to 3 pixels
glPointSize(3);
glBegin(GL_POINTS);
glVertex2i(10,10);
glVertex2i(20,10);
glVertex2i(25,15);
glVertex2i(20,20);
glVertex2i(10,20);
glEnd();
glFlush();
}
int main(int argc, char** argv)
{
glutInit(&argc,argv);
glutInitWindowPosition(50,50);
glutInitWindowSize(640,480);
glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
glutCreateWindow("A sample OpenGL application");
glMatrixMode(GL_PROJECTION);
gluOrtho2D(0,50,0,50);
glutDisplayFunc(display);
glutMainLoop();
return 0;
}