week15 內插角度轉動

#include <GL/glut.h>

float a=0; //內差的比重值 

float angle=0;

float angleOld=0;

float angleNew=90;

void display()

{

glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

glPushMatrix();

glRotatef(angle, 0, 0, 1);

glutSolidTeapot(0.3);

glPopMatrix();

glutSwapBuffers();

}

void keyboard(unsigned char key, int x, int y)

{

if(key=='r'){

a+=0.1;

angle = angleOld * (1-a) + angleNew * a; //內插公式 

}

glutPostRedisplay();

}

int main()

{

glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

glutCreateWindow("week15");

glutKeyboardFunc(keyboard);

glutDisplayFunc(display);

glutMainLoop();

}