小球自由落体（计算机图形学）

////////////////////////////////////////////////////////////// //自由落体 /////////////////////////////////////////////////////////////////////////////// #pragma comment(lib, "glut32.lib") #pragma comment(lib, "glu32.lib") #pragma comment(lib, "opengl32.lib") #include "GL/glut.h" #include"iostream.h" static int up = 0, down = 1; static double height=4.5; void init() { glEnable( GL_LIGHTING ); glEnable( GL_LIGHT0 ); glEnable( GL_DEPTH_TEST );//打开深度缓存 } void display() { glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); glMatrixMode( GL_MODELVIEW ); glLoadIdentity(); gluLookAt(0.0,0.0,0.0, 0.0,0.0,-100.0, 0.0,1.0,0.0); glPushMatrix(); glTranslatef( 0.0, 0.0, -13.0 ); glTranslatef(0.0,(GLdouble)height,0.0); glutSolidSphere( 0.4, 40, 40 ); // if(flag==0) if(down == 1) { height-=0.5; } if(up ==1) { height+=0.5; } // glTranslated( 0.0, height, 0.0 ); if(height <= -4.5) { up = 1; height = -4.5; down = 0; } if(height>=4.5) { up = 0; down = 1; height = 4.5; } glPopMatrix(); glutSwapBuffers(); } void reshape( int w, int h ) { glViewport( 0, 0, (GLsizei)w, (GLsizei)h ); glMatrixMode( GL_PROJECTION ); glLoadIdentity(); gluPerspective( 40.0, (GLfloat)w/(GLfloat)h, 1.0, 20.0 ); } void TimerFunc(int value) { glutPostRedisplay(); glutTimerFunc(100, TimerFunc, 1); //seconds, func, para } /*void mouse( int button, int state, int x, int y ) { switch ( button ) { case GLUT_LEFT_BUTTON: if ( state == GLUT_DOWN ) { spin = ( spin + 45 ) % 360; glutPostRedisplay(); } break; default: break; } }*/ void main( ) { glutInitDisplayMode( GLUT_RGB |GLUT_DOUBLE| GLUT_DEPTH );// GLUT_SINGLE glutInitWindowPosition( 100, 100 ); glutInitWindowSize( 500, 500 ); glutCreateWindow("实例"); init(); glutDisplayFunc( display ); // glutMouseFunc( mouse ); glutReshapeFunc( reshape ); glutTimerFunc(500, TimerFunc, 1); glutMainLoop(); return; }