金魚腦波學

電腦圖學

1.主題:計時器Timer

2.主題:內插公式(interpolation)

3.主題:動畫

4.期末作品

一秒一泡泡聲

#include <GL/glut.h>

#include <mmsystem.h>///Now (1)

#include <stdio.h>///printf()

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glutSolidTeapot( 0.3 );

    glutSwapBuffers();

}

void timer(int t)///NOW timer!!!!

{

    glutTimerFunc(1000, timer, t+1 );///NOW timer!!!! 起床要播下一個鬧鐘

    printf("timer(t) 的 t是 %d\n", t);///順便印一下現在的t是多少

    PlaySoundA("bubbs.wav", NULL, SND_ASYNC);///Now (2) ///NOW timer!!!!

}

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutInitWindowSize(500,500);///變大了

    glutCreateWindow("week 14 timer");

    glutDisplayFunc(display);

    glutTimerFunc(3000, timer, 0);///NOW timer!!!!

    glutMainLoop();

}

自動旋轉的茶壺

#include <GL/glut.h>

#include <mmsystem.h>///Now (1)

float angle=0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angle, 0,0,1);

        glutSolidTeapot( 0.3 );

    glPopMatrix();

    glutSwapBuffers();

}

void timer(int t)///NOW timer!!!!

{

    /// 1000 ms = 1 sec,  30 ms = 1/33 sec , 33 fps

    glutTimerFunc(30, timer, t+1 );///NOW timer!!!! 起床要播下一個鬧鐘

    angle += 1;

    glutPostRedisplay();///系統重繪畫面

}

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutInitWindowSize(500,500);///變大了

    glutCreateWindow("week 14 timer");

    glutDisplayFunc(display);

    glutTimerFunc(3000, timer, 0);///NOW timer!!!!

    glutMainLoop();

}

內插公式

移動的茶壺(左往右飛入)

#include <GL/glut.h>

#include <mmsystem.h>///Now (1)

float angle=0;

float nowX=0;///NOW2

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        ///glRotatef(angle, 0,0,1);

        glTranslatef(nowX, 0, 0);///NOW2

        glutSolidTeapot( 0.3 );

    glPopMatrix();

    glutSwapBuffers();

}

void timer(int t)///NOW timer!!!!

{

    /// 1000 ms = 1 sec,  30 ms = 1/33 sec , 33 fps

    glutTimerFunc(30, timer, t+1 );///NOW timer!!!! 起床要播下一個鬧鐘

    float alpha = (t%33) / 33.0;///NOW2 alpha 內插

    nowX = alpha* 1 + (1-alpha)* -1 ;///NOW2

    angle += 1;

    glutPostRedisplay();///系統重繪畫面

}

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutInitWindowSize(500,500);///變大了

    glutCreateWindow("week 14 timer");

    glutDisplayFunc(display);

    glutTimerFunc(1000, timer, 0);///NOW timer!!!!

    glutMainLoop();

}