openGL人脸动画，人脸绕中心旋转

#include <glut.h> #include<stdio.h> //The head position float x,y; int drag = 0; void InitAWindow(int argc, char **argv) { glutInit(&argc, argv); // Initialize GLUT function callings glutInitWindowSize( 500,500); glutInitWindowPosition( 100, 100); glutCreateWindow( "dragging"); return; } void Init() { glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(-4.0,4.0, -4.0, 4.0); glMatrixMode(GL_MODELVIEW); glClearColor(0.0, 0.0, 0.0, 0.0); glColor3f(0.0,0.0,1.0); glClear(GL_COLOR_BUFFER_BIT); glFlush(); } void draw_head() { glBegin( GL_TRIANGLE_FAN); glVertex2f( 0.7, 0.95); glVertex2f( 0.3, 0.9); glVertex2f(0.15, 0.65); glVertex2f( 0.55, 0.75); glVertex2f( 0.6, 0.6); glVertex2f( 0.8, 0.75); glVertex2f( 0.99, 0.7); glEnd(); glBegin( GL_POLYGON); //Draw the mouth glVertex2f( 0.53, 0.16); glVertex2f( 0.67, 0.17); glVertex2f( 0.72, 0.25); glVertex2f( 0.45, 0.22); glEnd(); glBegin( GL_TRIANGLES); glVertex2f( 0.58, 0.52); glVertex2f( 0.5, 0.3); glVertex2f( 0.66, 0.3); glEnd(); glLineWidth(4); glBegin(GL_LINES); glVertex2f( 0.3, 0.64); glVertex2f( 0.5, 0.6); glVertex2f( 0.64, 0.6); glVertex2f( 0.86, 0.64); glEnd(); glPointSize(7); glBegin(GL_POINTS); glVertex2f( 0.4, 0.55); glVertex2f( 0.75, 0.55); glEnd(); } void display(void) { glClear(GL_COLOR_BUFFER_BIT); draw_head(); glColor3f(0,0,1); glBegin(GL_POINTS); glVertex3f(x,y,0); glEnd(); glFlush(); glutSwapBuffers(); } void move() { glTranslatef( x, y, 0.0); glRotatef( 0.1, 0, 0, 1.0); glutPostRedisplay(); glTranslatef( -x, -y, 0); glutPostRedisplay(); } void mousef( int button, int state, int xx, int yy) { if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN) { x = xx/100.-2. -.5; y= 2.-yy/100. -.5; glutSwapBuffers(); } } int main( int argc, char **argv) { InitAWindow(argc, argv); glutMouseFunc( mousef); glutDisplayFunc(display); glutIdleFunc(move); Init(); glutMainLoop(); return 0; }