#include <GL/glut.h>

void
reshape(int w, int h)
{
    glViewport(0, 0, w, h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0, w, 0, h, -1, 1);
}

void
display(void)
{
    glClear(GL_COLOR_BUFFER_BIT);
    glBegin(GL_POINTS);
    for (int i = 0; i<399; ++i)
    {
        glVertex2i(i, (i*i)%399);
    }
    glEnd();
    glFlush();
}

int
main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutCreateWindow("some points");
    glutDisplayFunc(display);
    glutReshapeFunc(reshape);
    glutMainLoop();
    return 0;
}