GitHub项目地址OpenGL(glut)模拟太阳系：太阳，地球，月球，火星
核心代码如下：
// orgin.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。//#include "pch.h"#include <cstdlib>#include <cstdio>#include <cmath>#include <iostream>#include <windows.h>#include <GL/gl.h>#include <GL/glu.h>#include <GL/glut.h>using namespace std;bool bPersp = false;int year = 0, day = 0, marsYear = 0;int speed = 12;float light_angle = 0;bool bWire = false;float light_radius = 8.0;float eye[] = {5.5, 1.7, 1.7};float center[] = {0, 0, 0 };int wHeight = 0;int wWidth = 0;int state = 1;float star[1000][3];GLUquadricObj *g_text;void lPosition(){float y, z;y = light_radius * cos(light_angle);z = light_radius * sin(light_angle);float light_position[] = {3.0, y, z, 0.0 };glLightfv(GL_LIGHT0, GL_POSITION, light_position);}void init(void){glClearColor(0.0, 0.0, 0.0, 0.0);lPosition();glShadeModel(GL_SMOOTH);glEnable(GL_LIGHTING);glEnable(GL_LIGHT0);glEnable(GL_DEPTH_TEST);glEnable(GL_COLOR_MATERIAL);g_text = gluNewQuadric();}void init_stars(){for (int i = 0; i < 1000; i++)for (int j = 0; j < 3; j++)star[i][j] = rand() % 20 - 10;}void stars(){glBegin(GL_POINTS);glColor3f(1.0f, 1.0f, 1.0f);for (int i = 0; i < 1000; ++i) {glVertex3f(star[i][0], star[i][1], star[i][2]);}glEnd();}void sun(){glPushMatrix();glColor3f(1.0f, 0.0f, 0.0f);gluSphere(g_text, 0.7, 32, 32);glPopMatrix();}void earth(){glPushMatrix();glColor3f(0.0f, 0.0f, 1.0f);glRotatef((GLfloat)year / 10, 0.0, 0.0, 1.0);glTranslatef(2.1, 0.0, 0.0);glRotatef((GLfloat)day / 10, 0.0, 0.0, 1.0);gluSphere(g_text, 0.25, 20, 16);glColor3f(1.0f, 1.0f, 0.0f);glRotatef((GLfloat)year / 10, 0.0f, 0.0f, 1.0f);glRotatef(day / 30.0 * 360.0, 0.0f, 0.0f, 1.0f);glTranslatef(0.3f, 0.0f, 0.0f);gluSphere(g_text, 0.06, 20, 16);glPopMatrix();}void mars(){glPushMatrix();glColor3f(166.0 / 256, 119.0 / 356, 67.0 / 256);glRotatef((GLfloat)marsYear / 10, 0.0, -1.0, 1.0);glTranslatef(3.2, 1.0, 0.0);glRotatef((GLfloat)day, 0.0, 0.0, 1.0);gluSphere(g_text, 0.23, 20, 16);glPopMatrix();}void redraw(void){lPosition();glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);if (bWire) {glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);}else {glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);}glColor3f(1.0, 1.0, 1.0);glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR);glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR);glEnable(GL_TEXTURE_2D);stars();sun();earth();mars();glDisable(GL_TEXTURE_2D);glutSwapBuffers();}void cPosition(){glLoadIdentity();cout << "eye[0] : " << eye[0] << " eye[1] : "<< eye[1] << " eye[2] : " << eye[2] << endl;gluLookAt(eye[0], eye[1], eye[2],center[0], center[1], center[2],0.0, 0.0, 1.0);}void updateView(int width, int height){glViewport(0, 0, (GLsizei)width, (GLsizei)height);glMatrixMode(GL_PROJECTION);glLoadIdentity();if (!bPersp) {gluPerspective(65.0f, (GLfloat)width / (GLfloat)height, 1.0f, 100.0f);}else {glOrtho(-3, 3, -3, 3, -100, 100);}glMatrixMode(GL_MODELVIEW);cPosition();}void reshape(int width, int height){wHeight = height;wWidth = width;updateView(wWidth, wHeight);}void move(){year = (year + 8) % 3600;marsYear = (marsYear + 6) % 3600;day = (day + 30) % 3600;}void keyboard(unsigned char key, int x, int y){switch (key){case 'p': {bPersp = !bPersp;updateView(wWidth, wHeight);break;}case 'o': {bWire = !bWire; break; }case 'w': {eye[0] += 1;center[0] += 1;cPosition();break;}case 'a': {eye[1] += 1;center[1] += 1;cPosition();break;}case 's': {eye[0] -= 1;center[0] -= 1;cPosition();break;}case 'd': {eye[1] -= 1;center[1] -= 1;cPosition();break;}case 'z': {eye[2] -= 1;center[2] -= 1;cPosition();break;}case 'c': {eye[2] += 1;center[2] += 1;cPosition();break;}case 'r':eye[0] = 5.5;eye[1] = 1.7;eye[2] = 1.7;center[0] = 0;center[1] = 0;center[2] = 0;cPosition();break;case 'q': {exit(0); break; }default:break;}}void myIdle(void){Sleep(speed);move();glutPostRedisplay();}int main(int argc, char **argv){cout << "WASDZC change the Camera Position" << endl;cout << " O change GL_LINE GL_FILL" << endl;cout << " P change the Perspective orthographic projection" << endl;cout << " R reset the Camera" << endl;cout << endl<< endl<< "By Zhang Sidan : Nov. " << endl;glutInit(&argc, argv);glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);glutInitWindowSize(1080, 680);glutInitWindowPosition(100, 100);glutCreateWindow(argv[0]);init();init_stars();glutDisplayFunc(redraw);glutReshapeFunc(reshape);glutKeyboardFunc(keyboard);glutIdleFunc(&myIdle);glutMainLoop();return 0;}
