#include <Windows.h>#include <cstdio>#include <random>#include <functional>#include "glut.h"typedef GLfloat point2d[2];point2d v[3] = { { 0.0, 0.0 }, { 250.0, 500.0 }, { 500.0, 0.0 } };std::uniform_int_distribution<int> uniform_dist(0, 255);std::normal_distribution<double> normal_dist(2.0, 0.05); //这个正态分布发生器用于扰动细分三角形的中点std::default_random_engine engine;auto uniform_rand = std::bind(uniform_dist, engine);auto normal_rand = std::bind(normal_dist, engine);void triangle(point2d a, point2d b, point2d c) {    glBegin(GL_LINE_LOOP);    glVertex2fv(a);    glVertex2fv(b);    glVertex2fv(c);    glEnd();}void divide_triangle(point2d a, point2d b, point2d c, int k) {    point2d ab, ac, bc;    if (k > 0)    {        for (int j = 0; j < 2; j++)            ab[j] = (a[j] + b[j]) / normal_rand();        for (int j = 0; j < 2; j++)            ac[j] = (a[j] + c[j]) / normal_rand();        for (int j = 0; j < 2; j++)            bc[j] = (b[j] + c[j]) / normal_rand();        divide_triangle(a, ab, ac, k - 1);        divide_triangle(b, ab, bc, k - 1);        divide_triangle(c, ac, bc, k - 1);    }    else        triangle(a, b, c);}void display(void) {    glClear(GL_COLOR_BUFFER_BIT);    divide_triangle(v[0], v[1], v[2], 5);    glFlush();}void my_init(void) {    glClearColor(1.0, 1.0, 1.0, 1.0);    glColor3f(1.0, 0.0, 0.0);    glMatrixMode(GL_PROJECTION);    glLoadIdentity();    gluOrtho2D(0.0, 500.0, 0.0, 500.0);    glMatrixMode(GL_MODELVIEW);}void my_menu(int entry_id) {    switch (entry_id) {    case 0:        glClear(GL_COLOR_BUFFER_BIT);        glColor3b(uniform_rand(), uniform_rand(), uniform_rand());        glutPostRedisplay();        break;    /*case 1: {        CHOOSECOLOR color;        printf("%d\n", ChooseColor(&color));        glClear(GL_COLOR_BUFFER_BIT);        glColor3b(GetRValue(color.rgbResult), GetGValue(color.rgbResult), GetBValue(color.rgbResult));        glutPostRedisplay();        break;    }*/    default:        break;    }}void keyboard(unsigned char key, int x, int y) {    if (key = ‘q‘ || key == ‘Q‘)        exit(0);}int main(int argc, char *argv[]) {    HWND hWnd = GetForegroundWindow();    ShowWindow(hWnd, SW_HIDE); //hide cmd window    glutInit(&argc, argv);    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);    glutInitWindowPosition(100, 100);    glutInitWindowSize(500, 500);    glutCreateWindow("2D Sierpinski (Triangle Ver)");    glutDisplayFunc(display);    int menu_id = glutCreateMenu(my_menu);    glutAddMenuEntry("随机颜色重画", 0);    //glutAddMenuEntry("选择颜色", 1);    glutAttachMenu(GLUT_RIGHT_BUTTON);    glutKeyboardFunc(keyboard);    my_init();    glutMainLoop();        return 0;}