旋轉茶壺 內插

#include<GL/glut.h>
float a=0;
float angle[20]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
float angleOld[20]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
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();
glRotatef(angle[0],0,0,1);
glutSolidTeapot(0.3);
glPopMatrix();
glutSwapBuffers();
}
void timer(int t)
{
}
void keyboard(unsigned char key,int x,int y)
{
if(key=='s'){
}else if(key=='r'){
a+=0.1;
angle[0]=angleOld[0]*(1-a)+angleNew[0]*a;
glutPostRedisplay();
}else if(key=='p'){
}
}
int main()
{
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("Week15");
glutKeyboardFunc(keyboard);
glutDisplayFunc(display);
glutMainLoop();
}