自動轉

#include <GL/glut.h>
float a=0;
float angle[20]={0,90,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
float angleOld[20]={0,90,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
float angleNew[20]={90,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

void display()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glPushMatrix();
    glTranslatef(angle[3], angle[4], angle[5]);
    glPushMatrix();
    glColor3f(1,1,0);
    glRotatef(angle[0],0,0,1);
    glutSolidTeapot(0.3);
    glPopMatrix();
    glPushMatrix();
    glTranslatef(0.5,0,0);
    glRotatef(angle[1],0,0,1);
    glutSolidTeapot(0.3);
    glPopMatrix();
    glPopMatrix();
    glutSwapBuffers(); 
}

void readNext()
{
    a+=0.1;
    for(int i=0;i<20;i++) angle[i] = angleOld[i] * (1-a) + angleNew[i] * a;
}

void timer(int t)
{
    glutTimerFunc(50, timer, 0);
    readNext();
    glutPostRedisplay();
}

void keyboard(unsigned char key, int x, int y)
{
    if(key=='r'){
            readNext();
        }
        else if(key='p'){
            glutTimerFunc(0, timer, 0);
        }
    glutPostRedisplay();
}

int main()
{
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
    glutCreateWindow("week15");
   
    glutKeyboardFunc(keyboard);
    glutDisplayFunc(display);
    glutMainLoop();
}