內插轉動

#include<GL/glut.h>
float a=0;
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;
}
glutPostRedisplay();
}

int main()
{
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("week15");

glutKeyboardFunc(keyboard);
glutDisplayFunc(display);
glutMainLoop();
}

使用陣列
#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();
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();
glutSwapBuffers();
}

void keyboard(unsigned char key, int x, int y)
{
if (key=='r'){
a+=0.1;
angle[0] = angleOld[0]*(1-a) + angleNew[0]*a;
angle[1] = angleOld[1]*(1-a) + angleNew[1]*a;
angle[2] = angleOld[2]*(1-a) + angleNew[2]*a;
angle[3] = angleOld[3]*(1-a) + angleNew[3]*a;
angle[4] = angleOld[4]*(1-a) + angleNew[4]*a;
angle[5] = angleOld[5]*(1-a) + angleNew[5]*a;
angle[6] = angleOld[6]*(1-a) + angleNew[6]*a;
angle[7] = angleOld[7]*(1-a) + angleNew[7]*a;
angle[8] = angleOld[8]*(1-a) + angleNew[8]*a;
angle[9] = angleOld[9]*(1-a) + angleNew[9]*a;
}
glutPostRedisplay();
}

int main()
{
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("week15");

glutKeyboardFunc(keyboard);
glutDisplayFunc(display);
glutMainLoop();
}

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

int main()
{
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("week15");

glutKeyboardFunc(keyboard);
glutDisplayFunc(display);
glutMainLoop();
}

#include <stdio.h>
#include <GL/glut.h>
float a = 0; //內插法比重
//有很多個角度都要做內插法怎麼辦? 利用陣列, 就可以存很多個角度了
float angle[20] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; //用來轉動的角度，由angleOld, angleNew計算出
float angleOld[20] = {0,90,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; //舊的角度，用來做內插法
float angleNew[20] = {90,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; //新的角度，用來做內插法
int angleID = 0;
FILE *fout = NULL, *fin = NULL;

void display()
{
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
     glPushMatrix(); //1
      glRotatef(angle[0], 0,0,1);
      glutSolidTeapot(0.3);
     glPopMatrix();
     glPushMatrix(); //2
      glTranslatef(0.5, 0,0);
  glRotatef(angle[1], 0,0,1);
  glutSolidTeapot(0.3);
     glPopMatrix();
     glutSwapBuffers();
}
void readNext() //改變角度
{
 if (fin == NULL) fin = fopen("this is my file for animation.txt", "r");
 a += 0.1; //比重一直增加，角度才會變化
 for( int i=0; i<=20; i++){ //全部打出來太遜了,  用for可以直接打20個,比葉問還厲害!
  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) //計時器定時抓角度
{
 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=='0') angleID = 0;
 if(key=='1') angleID = 1;
 if(key=='2') angleID = 2;
 if(key=='3') angleID = 3;
 if(key=='s'){
  if(fout==NULL) fout = fopen("this_is_my_file_for_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");

 glutKeyboardFunc(keyboard);
 glutDisplayFunc(display);
 glutMainLoop();
}