그래픽스 : Solar System

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// SolarSystem.cpp : Defines the entry point for the console application. //   //self rotation 자전 //orbiting 공전   /* * self rotation표현하기 위해 * rotation axis : +y  (0,1,0) * rotation angle : 얼마나 돌았나 */   #define _USE_MATH_DEFINES #include <gl glut.h=""> #include <cmath>   void init(); void display(); void idle(); void draw_axes(); void draw_cube();   float moon_selfrot_angle; float moon_radius,earth_radius ; float moon_orbit_angle,earth_selfrot_angle; float moon_orbit_raidus; float   sun_radius,earth_orbit_raidus,earth_orbit_angle;   void main(int argc, char* argv[]) {     glutInit(&argc, argv);     glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);      glutInitWindowPosition(100, 100);     glutInitWindowSize(640, 640);     glutCreateWindow("GLUT tutorial");     glutDisplayFunc(display);     glutIdleFunc(idle);     init();     glutMainLoop(); }     void init() {     glClearColor(1.0f, 1.0f, 1.0f, 1.0f);     glEnable(GL_DEPTH_TEST);       glMatrixMode(GL_PROJECTION);     glLoadIdentity();      gluPerspective(45.0f, 1.0f, 0.001f, 10000.0f);    // don't care at this moment       sun_radius=10.0f;     earth_orbit_raidus=26.0f;     earth_orbit_angle= 0.0f;     moon_radius=0.7f;     moon_selfrot_angle = 0.0f;     moon_orbit_angle=0.0f;     moon_orbit_raidus=3.5f;     earth_radius=1.2f;     earth_selfrot_angle=0.0f; }     void display() {     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);       glMatrixMode(GL_MODELVIEW);     glLoadIdentity();      gluLookAt(50.0, 50.0, 50.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);       draw_axes();     // DRAW the SUn       glPushMatrix();       glScalef(sun_radius,sun_radius,sun_radius);     glColor3f(1.0f,0.0f,0.0f);     draw_cube();     glPopMatrix();           glTranslatef(earth_orbit_raidus*cos(2*M_PI*earth_orbit_angle/360),0.0f,         earth_orbit_raidus*sin(2*M_PI*earth_orbit_angle/360));         glPushMatrix(); // 지구랑 달을 묶어서 위의 트렌스레이션을 하기위해     // 중괄호 같이 묶는다는 느낌.     //지구           glPushMatrix(); /////////////////////////////////////     //현재 MV메트릭스를 저장하고 POP때 불러온다     // 이게 계층척 그래픽스의 핵심. 모델간의 계층관계를 표현하기 위해.     // 기존의 I 메트릭스를 PUSH     glRotatef(earth_selfrot_angle,0.5,0.5,0);     glScalef(earth_radius,earth_radius,earth_radius);     glColor3f(0.0f,1.0f,0.0f);     draw_cube();     glPopMatrix();  ///////////////////////////////////     // 기존의 pUSH 했던 I매트릭스를 pOP               //dRAW THE MOON     // 360 : 2*M_PI = Moon_orbit_angle : x ==> 2*M_PI*moon_orbit_angle/360     glTranslatef(moon_orbit_raidus*cos(2*M_PI*moon_orbit_angle/360),0.0f,         moon_orbit_raidus*sin(2*M_PI*moon_orbit_angle/360));       glScalef(moon_radius,moon_radius,moon_radius);     glColor3f(0.5f, 0.5f, 0.5f);     glRotatef(moon_selfrot_angle,0,-1,0);     draw_cube();       glPopMatrix();     glutSwapBuffers(); }     void draw_axes() {     glBegin(GL_LINES);     // x axis     glColor3f(0.2f, 0.2f, 0.2f);     glVertex3f(-10.0f, 0.0f, 0.0f);     glColor3f(1.0f, 0.0f, 0.0f);     glVertex3f( 10.0f, 0.0f, 0.0f);     // y axis     glColor3f(0.2f, 0.2f, 0.2f);     glVertex3f(0.0f, -10.0f, 0.0f);     glColor3f(0.0f, 1.0f, 0.0f);     glVertex3f(0.0f,  10.0f, 0.0f);     // z axis     glColor3f(0.2f, 0.2f, 0.2f);     glVertex3f(0.0f, 0.0f, -10.0f);     glColor3f(0.0f, 0.0f, 1.0f);     glVertex3f(0.0f, 0.0f,  10.0f);      glEnd(); }   void draw_cube() {     glBegin(GL_QUADS);     // front     glVertex3f( 0.5f,  0.5f,  0.5f);     glVertex3f(-0.5f,  0.5f,  0.5f);     glVertex3f(-0.5f, -0.5f,  0.5f);     glVertex3f( 0.5f, -0.5f,  0.5f);     // back     glVertex3f( 0.5f,  0.5f, -0.5f);     glVertex3f( 0.5f, -0.5f, -0.5f);     glVertex3f(-0.5f, -0.5f, -0.5f);     glVertex3f(-0.5f,  0.5f, -0.5f);     // top     glVertex3f( 0.5f,  0.5f,  0.5f);     glVertex3f( 0.5f,  0.5f, -0.5f);     glVertex3f(-0.5f,  0.5f, -0.5f);     glVertex3f(-0.5f,  0.5f,  0.5f);     // bottom     glVertex3f( 0.5f, -0.5f,  0.5f);     glVertex3f(-0.5f, -0.5f,  0.5f);     glVertex3f(-0.5f, -0.5f, -0.5f);     glVertex3f( 0.5f, -0.5f, -0.5f);     // left     glVertex3f(-0.5f,  0.5f,  0.5f);     glVertex3f(-0.5f,  0.5f, -0.5f);     glVertex3f(-0.5f, -0.5f, -0.5f);     glVertex3f(-0.5f, -0.5f,  0.5f);     // right     glVertex3f( 0.5f,  0.5f,  0.5f);     glVertex3f( 0.5f, -0.5f,  0.5f);     glVertex3f( 0.5f, -0.5f, -0.5f);     glVertex3f( 0.5f,  0.5f, -0.5f);     glEnd(); }     void idle() {     // TODO: ...     earth_orbit_angle+=0.01f;     if(earth_orbit_angle > 360){         earth_orbit_angle = 0.0f;     }       moon_selfrot_angle+=0.01;//degree (도)       if(moon_selfrot_angle > 360){         moon_selfrot_angle = 0.0f;     }     moon_orbit_angle+=0.04; //      if(moon_orbit_angle > 360){         moon_orbit_angle= 0.0f;     }     earth_selfrot_angle+=0.06f;     if(earth_selfrot_angle > 360)         earth_selfrot_angle=0.0f;       glutPostRedisplay(); }       </cmath></gl>