OpenGL月球围绕地球转的完整代码

/****************************** ** Title: earth and moon ** Author: 於梂 09008211 ** Date:2010-12-11 ******************************/ #include <Windows.h> #include <stdio.h> #include <cmath> #include <gl/GLU.h> #include <gl/glut.h> #include <gl/GLAux.h> #pragma comment(lib, "glaux.lib"); /* animation definition */ const double pi=3.1415926535897932384626433832795; const double d=0.1; // lighting's angel change d for each 'a' or 'd' pressed const double moonRotaV = 10; // speed of moon's rotation const double sunR = 600; // distance from sun to earth const double moonRa = 500; // the major semi axis of the orbit of moon const double moonRb = 300; // the minor semi axis of the orbit of moon double theta = 0; // of lighting, changed by key 'a' or 'd' double depressionAngle = 30; double moonTheta = 0; // of moon's revolution double earthRota=0; // of earth's rotation double moonRota=0; // of moon's rotation GLfloat light_position[] = {sunR,0,0}; GLfloat light_specular[] = {1,1,1,1}; GLfloat light_diffuse[] = {0.5,0.5,0.5,1}; GLfloat light_ambient[] = {0.2,0.2,0.2,1}; GLfloat moon_position[] = {moonRa, 0,0}; bool pause = true; // flag for if the animation pauseed or not bool setLighting(); bool setLightingPos(); /* OpenGL callback function declaration */ void myInit(); void myDisplay(); void myKeyboardFunc(unsigned char c, int x, int y); void myIdleFunc(); /* texture function declaration */ AUX_RGBImageRec* textureImage; // used for store the .bmp read in GLuint texture[2]; //texture[0] is the texture of earth, texture[1] is of moon AUX_RGBImageRec* loadBMP(char* fileName); bool loadTexture(); int main(int argc, char** argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); /* Set window */ glutInitWindowSize(1200,700); glutInitWindowPosition(50,25); glutCreateWindow("Lighting and texture"); /* Initialize OpenGL */ myInit(); /* set callback function */ glutDisplayFunc(myDisplay); glutKeyboardFunc(myKeyboardFunc); glutIdleFunc(myIdleFunc); /* start OpenGL */ glutMainLoop(); return 0; } void myInit() { glClearColor(0,0,0,1); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glEnable(GL_DEPTH_TEST); /* set matrix mode */ glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(-600,600,-350,350,-400,400); /* set lighting */ glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); setLighting(); /* set texture */ glEnable(GL_TEXTURE_2D); glShadeModel(GL_SMOOTH); loadTexture(); } void myIdleFunc() { if (pause) { return ; } Sleep(30); /* calculate the new orbit position of moon */ if ((moonTheta -= moonRotaV/360) > 2*pi ) { moonTheta += 2*pi; } moon_position[0] = moonRa*cos(moonTheta); moon_position[2] = moonRb*sin(moonTheta); /* implement earth and moon's rotation */ if ((earthRota += 10) > 360 ) earthRota -= 360; if ((moonRota += moonRotaV) > 360 ) moonRota -= 360; glutPostRedisplay(); } void myDisplay() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); /* generate earth */ glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glRotatef(depressionAngle, 1,0,0); // the angel between sight and the plane of moon's orbit is 30 degree glPushMatrix(); glRotatef(earthRota,0,1,0); glRotatef(-90,1,0,0); // make the north polar is on the top glBindTexture(GL_TEXTURE_2D, texture[0]); glTexCoord2f(0,0); glTexCoord2f(1,0); glTexCoord2f(1,1); glTexCoord2f(0,1); glColor3d(1,1,1); GLUquadric* earth = gluNewQuadric(); gluQuadricTexture(earth, true); gluSphere(earth,160,50,50); glPopMatrix(); /* generate moon */ glMatrixMode(GL_MODELVIEW); glPushMatrix(); glTranslatef(moon_position[0], moon_position[1], moon_position[2]); glRotatef(moonRota,0,1,0); glBindTexture(GL_TEXTURE_2D, texture[1]); glTexCoord2f(0,0); glTexCoord2f(1,0); glTexCoord2f(1,1); glTexCoord2f(0,1); glColor3d(1,1,1); GLUquadric* moon = gluNewQuadric(); gluQuadricTexture(moon, true); gluSphere(moon,50,50,50); glPopMatrix(); glFlush(); glutSwapBuffers(); } bool setLighting() { glLightfv(GL_LIGHT0, GL_POSITION, light_position); glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular); glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient); return true; } bool setLightingPos() { glLightfv(GL_LIGHT0, GL_POSITION, light_position); return true; } void myKeyboardFunc(unsigned char c, int x, int y) { switch (c) { case 'w': case 'W':if ((depressionAngle += 5) > 90) depressionAngle = 90; break; case 's': case 'S':if ((depressionAngle -= 5) < -90) depressionAngle = -90; break; case 'a': case 'A':if ((theta += d) > pi*2) theta -= 2*pi; break; case 'd': case 'D':if ((theta -= d) < 0) theta += 2*pi;break; case ' ':pause = !pause;break; default:return; } light_position[0] = sunR * cos(theta); light_position[2] = sunR * sin(theta); if (setLightingPos()) { glutPostRedisplay(); } } /* the follow function reference mostly from the Internet. I double the number the texture can be create.Also some place looks bad have been changed*/ bool loadTexture() { textureImage = NULL; /* load texture of earth from earth.bmp */ if (textureImage = loadBMP("earth.bmp")) { glGenTextures(2, texture); glBindTexture(GL_TEXTURE_2D, texture[0]); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, textureImage->sizeX, textureImage->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, textureImage->data); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); if (textureImage->data) { free(textureImage->data); } free(textureImage); } else { return false; } /* load the texture of moon from moon.bmp */ if (textureImage = loadBMP("moon.bmp")) { glBindTexture(GL_TEXTURE_2D, texture[1]); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, textureImage->sizeX, textureImage->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, textureImage->data); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); if (textureImage->data) { free(textureImage->data); } free(textureImage); } else { return false; } return true; } /* the follow function reference mostly from the Internet. But I replace the auxDIBImageLoad() with auxDIBImageLoadA() to make the program run correctly. ** As a result, file named with Chinese can't be recognized */ AUX_RGBImageRec* loadBMP(char *fileName) { FILE *pFile = NULL; if (!fileName) { return NULL; } pFile = fopen(fileName, "r"); if (pFile) { fclose(pFile); return auxDIBImageLoadA(fileName); } return NULL; }