#include "stdafx.h"#include <GL/glut.h>#include <stdlib.h>#include <math.h>#include <stdio.h>void myDisplay(void) {    glClear(GL_COLOR_BUFFER_BIT);    glPointSize(5.0f);    //修改点的尺寸，默认大小为1.0f    glBegin(GL_POINTS);    glVertex2f(0.0f, 0.0f);    glVertex2f(0.5f, 0.5f);    glVertex2f(-0.5f, 0.0f);    glEnd();    glFlush();}int main(int argc, char *argv[]){    glutInit(&argc, argv);    glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE);    glutInitWindowPosition(100, 100);    glutInitWindowSize(500, 500);    glutCreateWindow("OpenGL画圆程序");    glutDisplayFunc(&myDisplay);    glutMainLoop();    return 0;}