opengl实现太阳系天体运动(6)

//绘制太阳

glColor3f( 1.0f, 1.0f, 0.0f );//黄色

glDisable( GL_LIGHTING ); glutSolidSphere( 50.f, 15, 15 );

//启动0号光源（模拟太阳的光芒）

glEnable( GL_LIGHTING );

GLfloat lightPos[] = { 0, 0, 0 };

glLightfv( GL_LIGHT0, GL_POSITION, lightPos );

//绘制地球

static GLfloat earthAngle = 0; const GLfloat RADIUS = 100.f; glRotatef( earthAngle, 0, 0, 1 ); glTranslatef( RADIUS, RADIUS, 0 ); glColor3f( 0.0f, 1.0f, 0.0f );//绿色

glutSolidSphere( 20.f, 15, 15 );

//启动1号光源,模拟地球的散射光

glLightfv( GL_LIGHT1, GL_POSITION, lightPos );

GLfloat whiteDiffuseLight[] = {0.1, 0.1, 0.1}; //set the diffuse light to white

glLightfv( GL_LIGHT1, GL_DIFFUSE, whiteDiffuseLight );

// 绘制黄色的“月亮”

glColor3f(1.0f, 1.0f, 0.0f);

glRotatef(earthAngle/30.0*360.0 - earthAngle/360.0*360.0, 0.0f, 0.0f, -1.0f);

glTranslatef(RADIUS/3, 0.0f, 0.0f); glutSolidSphere(7, 20, 20);

//启动2号光源,模拟月球的反射光

glLightfv( GL_LIGHT2, GL_POSITION, lightPos );

GLfloat graySpecularLight[] = {0.2, 0.2, 0.2}; //set the Specular light to gray white

glLightfv( GL_LIGHT2, GL_DIFFUSE, graySpecularLight );

earthAngle += 0.1; if ( earthAngle >= 360 ) {

earthAngle -= 360; }

printf( \, earthAngle );

// Restore transformations

glPopMatrix();

glutSwapBuffers(); }

int main(int argc, char* argv[]) {

glutInit(&argc, argv);

glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH); glutInitWindowSize (800, 600); glutInitWindowPosition (100, 100); glutCreateWindow( \ ); glutDisplayFunc( RenderScene );

glutIdleFunc (RenderScene); //glutIdleFunc 表示在CPU空闲的时间调用某一函数

glutReshapeFunc( ChangeSize ); glutSpecialFunc( SpecialKeys ); SetupRC(); glutMainLoop();

return 1; }

void SetupRC() {

glClearColor( 0, 0.0, 0.0, 1 );

glShadeModel( GL_SMOOTH );

glEnable(GL_DEPTH_TEST);//被遮住的部分不绘制

glEnable(GL_LIGHT0); glEnable(GL_LIGHT1); glEnable(GL_LIGHT2); }

void ChangeSize( GLsizei w, GLsizei h ) {

GLfloat nRange = 200.0f;

// Prevent a divide by zero

if(h == 0) h = 1;

// Set Viewport to window dimensions

glViewport(0, 0, w, h);

// Reset projection matrix stack

glMatrixMode(GL_PROJECTION); glLoadIdentity();

// Establish clipping volume (left, right, bottom, top, near, far)

if (w <= h)

glOrtho (-nRange, nRange, -nRange*h/w, nRange*h/w, -nRange, nRange); else

glOrtho (-nRange*w/h, nRange*w/h, -nRange, nRange, -nRange, nRange);

//45度视野，近、远平面分别为1和200

//gluPerspective( 45.f, (GLfloat)w/(GLfloat)h, 1, 200 );

// Reset Model view matrix stack

glMatrixMode(GL_MODELVIEW); glLoadIdentity(); }

void SpecialKeys(int key, int x, int y) {

if(key == GLUT_KEY_UP) xRot -= 5.0f;

if(key == GLUT_KEY_DOWN) xRot += 5.0f;

if(key == GLUT_KEY_LEFT) yRot -= 5.0f;