Week 14

1.主題：計時器Timer、內插公式、動畫



計時器聲音

#include <GL/glut.h>

#include <mmsystem.h>///NOW (0)發聲音

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glutSwapBuffers();

}

void timer(int t)///NOW (2)

{

    glutTimerFunc(1000, timer, 0);///NOW2

    PlaySoundA("fart.wav", NULL, SND_ASYNC);///NOW (2)

}

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutInitWindowSize(500,500);///大一點

    glutCreateWindow("week14 timer");

    glutDisplayFunc(display);

    glutTimerFunc(1000, timer, 0);///NOW (1)

    glutMainLoop();

}

內插：

alpha*新+(1-alpha)*舊

#include <GL/glut.h>

#include <mmsystem.h>///NOW (0)發聲音

#include <stdio.h>

float angle=0;

float nowX=0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef(nowX,0,0);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

void timer(int t)///NOW (2)

{

    glutTimerFunc(33, timer, t+1);

    printf("現在的 timer(t)的t是: %d\n", t);///NOW3

    float alpha =  (t%30) / 30.0;

    nowX = alpha*1.0 + (1-alpha)* -1.0;

    glutPostRedisplay();///NOW4 要更新畫面

}

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutInitWindowSize(500,500);///大一點

    glutCreateWindow("week14 timer");

    glutDisplayFunc(display);

    glutTimerFunc(1000, timer, 0);///NOW (1)

    glutMainLoop();

}