劉 電腦圖學

 week 14

主題 切換關節

第一堂課

下載 github

開新的GLUT專案week14-timer

將之前的10行程式碼複製貼上

並新增程式碼

#include <GL/glut.h>

float angle= 0;

void timer(int t)

{

    glutTimerFunc(500, timer, t+1);

    angle += 90;

    glutPostRedisplay();

}

void display()

{

    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );

    glPushMatrix();

     glRotatef(angle, 0, 0, 1);

     glutSolidTeapot( 0.3 );

   glPopMatrix();

   glutSwapBuffers();

}

   int main(int argc, char**argv)

{

  glutInit(&argc, argv);

  glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

  glutCreateWindow("week14");

  glutTimerFunc(3000, timer, 0);

  glutDisplayFunc(display);

  glutMainLoop();

}

開新專案week14-2_timer_play

將14-1貼上

#include <GL/glut.h>

float angle= 0;

void timer(int t)

{

    glutTimerFunc(500, timer, t+1);

    angle += 90;

    glutPostRedisplay();

}

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

{

    glutTimerFunc(0, timer, 0);

}

void display()

{

    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );

    glPushMatrix();

     glRotatef(angle, 0, 0, 1);

     glutSolidTeapot( 0.3 );

   glPopMatrix();

   glutSwapBuffers();

}

   int main(int argc, char**argv)

{

  glutInit(&argc, argv);

  glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

  glutCreateWindow("week14");

  glutKeyboardFunc(keyboard);

  glutDisplayFunc(display);

  glutMainLoop();

}

                                                  會旋轉

第二堂課

開啟Excel

week14-3 使用Excel

將week14-1,week14-2 備份到github

開新的GLUT專案week14-3_timer_alpha_interpolation

將14-2貼上

#include <GL/glut.h>

float angle= 0, newAngle = 0, oldAngle = 0;

float oldx = 0;

void timer(int t)

{

    if(t<100) glutTimerFunc(33, timer, t+1);

    float alpha = t/100.0;

    angle = alpha*newAngle + (1-alpha)*oldAngle;

    glutPostRedisplay();

}

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

{

    glutTimerFunc(0, timer, 0);

}

void mouse(int button, int state, int x, int y){

     if(state==GLUT_DOWN) oldAngle = angle;

     if(state==GLUT_UP) newAngle = angle;

     oldx = x;

     glutPostRedisplay();

}

void motion(int x, int y){

     angle += x-oldx;

     oldx = x;

     glutPostRedisplay();

}

void display()

{

    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );

    glPushMatrix();

     glRotatef(angle, 0, 0, 1);

     glutSolidTeapot( 0.3 );

   glPopMatrix();

   glutSwapBuffers();

}

   int main(int argc, char**argv)

{

  glutInit(&argc, argv);

  glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

  glutCreateWindow("week14");

  glutMouseFunc(mouse);

  glutMotionFunc(motion);

  glutKeyboardFunc(keyboard);

  glutDisplayFunc(display);

  glutMainLoop();

}

可以用滑鼠來旋轉

第三堂課

開啟Final_project

進行修改