內插 好難轉喔

/*都轉到哪去惹*/

#include <GL/glut.h>
#include <stdio.h>
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};
float a=0;
FILE *fout=NULL,*fin=NULL;
int angleID=0;
void display()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glTranslatef(angle[3], angle[4], angle[5]);
glPushMatrix();
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()
{
if(fin==NULL) fin=fopen("animation.txt","r");
a+=0.01;
for(int i=0;i<20;i++)
{
angle[i]=angleOld[i]*(1-a)+ angleNew[i] * a;
if(a>=1.0)
{
a=0.0;
for(int i=0;i<20;i++)
{
angleOld[i]=angleNew[i];
fscanf(fin,"%f",&angleNew[i]);
}
}
}
}
void timer(int t)
{
glutTimerFunc(100, timer, 0);
readNext();
glutPostRedisplay();
}
int OldX=0,OldY=0;
void mouse(int button,int state, int x, int y)
{
OldX=x; OldY=y;
}
void motion(int x, int y)
{
angle[angleID] +=(x-OldX);
OldX=x;
glutPostRedisplay();
}
void keyboard(unsigned char key, int x, int y)
{
if(key=='1') angleID=0;
if(key=='2') angleID=1;
if(key=='3') angleID=2;
if(key=='4') angleID=3;
if(key=='s'){
if(fout==NULL) fout=fopen("animation.txt","w+");
for(int i=0;i<20;i++)
{
printf("%f ",angle[i]);
fprintf(fout,"%f ",angle[i]);
}
printf("\n");
    fprintf(fout,"\n");
}
if(key=='r')
readNext();
else if(key=='p')
glutTimerFunc(0, timer, 0);

glutPostRedisplay();
}
int main()
{
glutInitDisplayMode(GLUT_DOUBLE| GLUT_DEPTH);
glutCreateWindow("week15");
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutKeyboardFunc(keyboard);
glutDisplayFunc(display);
glutMainLoop();
}