Yen的week16

 1.Week14-1_timer

#include <GL/glut.h>

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) ///step01-1 你的 timer()函式,做對應動作

{

    glutTimerFunc(500, timer, t+1); ///step01-1 設定下一個鬧鐘

    angle += 90; ///增加90度

    glutPostRedisplay(); ///重畫畫面

}

int main(int argc, char** argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week14");

    glutDisplayFunc(display);

    glutTimerFunc(2000, timer, 0); ///step01-1 設定timer函式

    glutMainLoop();

}

2.Week14-2_timer_play 用鍵盤來播放

#include <GL/glut.h>

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) ///step01-1 你的 timer()函式,做對應動作

{

    glutTimerFunc(500, timer, t+1); ///step01-1 設定下一個鬧鐘

    angle += 90; ///增加90度

    glutPostRedisplay(); ///重畫畫面

}

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

{

    glutTimerFunc(0, timer, 0);

}

int main(int argc, char** argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week14");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard); ///step01-2 用 keyboard()

    ///glutTimerFunc(2000, timer, 0); ///step01-1 設定timer函式

    glutMainLoop();

}

3.Week14-3_timer_alpha_interpolation

#include <GL/glut.h>

float angle=0, oldAngle=0, newAngle=0; ///step02-1 宣告變數

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) ///step01-1 你的 timer()函式,做對應動作

{

    if(t<100) glutTimerFunc(50, timer, t+1); ///step02-1 在100之內,設定下一個鬧鐘

    float alpha = t/ 100.0;///step02-1 alpha 介於0.00~1.00之間

    angle = newAngle*alpha + (1-alpha) * oldAngle; ///step02-1 alpha內插公式

    glutPostRedisplay(); ///重畫畫面

}

void motion(int x, int y) ///step02-1

{

    angle = x; ///step02-1 即時更新角度

    glutPostRedisplay(); ///step02-1 重畫畫面

}

void mouse(int button, int state, int x, int y) ///step02-1

{

    if(state==GLUT_DOWN) oldAngle = x; ///step02-1 按下去

    if(state==GLUT_UP) newAngle = x; ///step02-1 放開來

    glutPostRedisplay(); ///step02-1 重畫畫面

}

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

{

    glutTimerFunc(0, timer, 0);

}

int main(int argc, char** argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week14");

    glutDisplayFunc(display);

    glutMouseFunc(mouse); ///step02-1 按下去,表示起點, 放開來,表示終點

    glutMotionFunc(motion); ///step02-1 當mouse在motion時,即時更新畫面

    glutKeyboardFunc(keyboard); ///step01-2 用 keyboard()

    glutMainLoop();

}