#include "stdafx.h"#include
     
      #include
      
       #include
       
        #include 
        
         const double TWO_PI = 6.2831853;/*Initial display-window size*/GLsizei winWidth = 800, winHeight = 600;GLuint regHex;class screenPt{private:    GLint x, y;public:    /*Default Constructor:initalizes coordinate position to(0,0).*/    screenPt() { x = y = 0; }    void setGoords(GLint xGoord, GLint yGoord) { x = xGoord; y = yGoord; }    GLint getx()const { return x; }    GLint gety()const { return y; }};void drawcloud (GLint x, GLint y, GLint z){    GLdouble theta;    GLint k;    glBegin(GL_POLYGON);    for (k = 0; k < 360; k++)    {        theta = TWO_PI*k / 360.0;        glVertex2f(x * cos(theta) + y,x * sin(theta) + z);    }    glEnd();}//画云二的过程static void init(void){    screenPt hexVertex, circCtr;    GLdouble theta;    GLint k,j;    srand((int)time(0));        circCtr.setGoords(0, winHeight );    glClearColor(1.0, 1.0, 1.0, 0.0);    regHex = glGenLists(1);    glNewList(regHex, GL_COMPILE);    /*添加*/    glShadeModel(GL_SMOOTH);        glBegin(GL_QUADS);    glColor3f(0.6,0.8,0.9);    glVertex2f(0.0, 0.0);    glVertex2f(winWidth, 0.0);    glColor3f(0.0,0.2,0.8);    glVertex2f(winWidth, winHeight);    glColor3f(1.0, 1.0, 1.0);    glVertex2f(0.0, winHeight);//背景        glEnd();        glEnable(GL_POINT_SMOOTH);    glPointSize(15.0);    glBegin(GL_POINTS);    for (j = 0; j <= 8;j++)    {        glColor3f(0.60 + j*0.05, 0.60 + j*0.05, 0.60 + j * 0.05);        for (k = 0; k < (25-j); k++)        {                        glVertex2f(490 + j * 5 + k * 10, 100 + j * 5 + rand() % 8);                    }        }//cloud1    glEnd();        /*draw cloud2*/    glColor3f(0.9, 0.9, 0.9);    for (GLint i = 3; i <=8; i++)    {        drawcloud(100 / i, 400 + i * 15, 500 + rand() % 10);    }//云的腰    for (GLint i = 9; i <13; i++)    {        drawcloud(500/ (i*i), 480+i*5, 500 + rand() % 5);    }//云的尾巴    glColor3f(0.91, 0.91, 0.91);    drawcloud(30, 400, 500);    drawcloud(30, 420, 530);//云的头            /*draw cloud 3*/    glColor3f(1.0, 1.0, 1.0);    drawcloud(30, 300, 400);    drawcloud(30, 320, 430);    drawcloud(30, 340, 410);        for (int i = 1; i < 20; i++)    {        glColor3f(1.0, 1.0,1.0);        glPointSize(20.0-i);        glBegin(GL_POINTS);        glVertex2f(290-i, 380-i+ rand() % 5);        glEnd();//云的角    }    glColor3f(1.0, 1.0,1.0);    for (GLint i = 3; i <= 8; i++)    {        drawcloud(100 / i, 300 + i * 15, 400 + rand() % 10);    }//云的腰    for (int i = 1; i < 20; i++)    {        glColor3f(1.0, 1.0, 1.0);        glPointSize(20.0 - i);        glBegin(GL_POINTS);        glVertex2f(430 +i, 410 -rand() % 5);        glEnd();//云的尾巴2    }    /*draw cloud 4*/        glColor3f(0.9, 0.9, 0.9);    for (GLint i = 3; i <=8; i++)    {        drawcloud(100 / i, 200 + i * 15, 200 + rand() % 10);    }//云的腰    for (GLint i = 9; i <13; i++)    {        drawcloud(500/ (i*i), 280+i*5, 200 + rand() % 5);    }//云的尾巴    glColor3f(0.91, 0.91, 0.91);    drawcloud(30, 200, 200);    drawcloud(30, 220, 230);//云的头    glColor3f(1.0, 1.0, 1.0);//Set fill color for sun white    glBegin(GL_POLYGON);    for (k = 0; k < 360; k++)    {        theta = TWO_PI*k / 360.0;        hexVertex.setGoords(circCtr.getx() + 80 * cos(theta),            circCtr.gety() + 80* sin(theta));        glVertex2i(hexVertex.getx(), hexVertex.gety());    }    glEnd();        glEndList();}void regHexagon(void){    glClear(GL_COLOR_BUFFER_BIT);    glCallList(regHex);    glFlush();}void winReshapeFcn(GLint newWidth, GLint newHeight){    glMatrixMode(GL_PROJECTION);    glLoadIdentity();    gluOrtho2D(0.0, (GLdouble)newWidth, 0.0, (GLdouble)newHeight);    glClear(GL_COLOR_BUFFER_BIT);}void main(int argc, char** argv){    glutInit(&argc, argv);    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);    glutInitWindowPosition(200, 100);    glutInitWindowSize(winWidth, winHeight);    glutCreateWindow("blue_sky_and_white_cloud");    init();    glutDisplayFunc(regHexagon);    glutReshapeFunc(winReshapeFcn);    glutMainLoop();}