咻碰閃week14

 week14

1-1 先安裝git，clone 2023graphicsb到桌面上

1-2 開新的GLUT專案 week14-1_timer

desktop>2023graphicsb

desktop>2023graphicsb>Final_Project>freeglut

1-3 剪貼week2程式碼

#include <GL/glut.h>

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

int main(int argc, char **argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week14");

    glutDisplayFunc(display);

    glutMainLoop();

}

1-4 設timer轉動茶壺

#include <GL/glut.h>

float angle=0;///step01-1

void timer(int t)///step01-1

{

    glutTimerFunc(500,timer,t+1);///step01-1

    angle+=90;///角度加90度

    glutPostRedisplay();///step01-1重畫畫面

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angle,0,0,1);///step01-1

        glutSolidTeapot(0.3);

    glPopMatrix();///step01-1

    glutSwapBuffers();

}

int main(int argc, char **argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week14");

    glutTimerFunc(3000,timer,0);///step01-1

    glutDisplayFunc(display);

    glutMainLoop();

}

1-5 week14-2_timer_play，按任意鍵開始轉動茶壺

#include <GL/glut.h>

float angle=0;///step01-1

void timer(int t)///step01-1

{

    glutTimerFunc(33,timer,t+1);///step01-1

    angle+=3;///角度小轉得更順

    glutPostRedisplay();///step01-1重畫畫面

}

void keyboard(unsigned char key,int x,int y)///step01-2

{

    glutTimerFunc(0,timer,0);///step01-2

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angle,0,0,1);///step01-1

        glutSolidTeapot(0.3);

    glPopMatrix();///step01-1

    glutSwapBuffers();

}

int main(int argc, char **argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week14");

    glutKeyboardFunc(keyboard);///step01-2

    ///glutTimerFunc(3000,timer,0);///step01-1

    glutDisplayFunc(display);

    glutMainLoop();

}

2-1 開Excel檔

2-2 先備份

2-3 week14-3_timer_alpha_interpolation，用滑鼠鍵盤控制

///week14-3_timer_alpha_interpolation

#include <GL/glut.h>

float angle = 0, newAngle = 0, oldAngle = 0;///step02-2 宣告 新角度、舊角度

float oldX = 0;///step02-2 舊的x座標

void timer(int t)

{

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

    float alpha = t/100.0;///step02-2 所以alpha介於0.0~1.0之間

    angle = alpha*newAngle + (1-alpha)*oldAngle;///step02-2

    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;///step02-2

    if(state==GLUT_UP) newAngle = angle;///step02-2

    oldX = x;///step02-2

    glutPostRedisplay();///step02-2更新畫面

}

void motion(int x,int y){

    angle += x-oldX;///step02-2

    oldX = x;///step02-2

    glutPostRedisplay();///step02-2更新畫面

}

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);///step02-2

    glutMotionFunc(motion);///step02-2

    glutKeyboardFunc(keyboard);///step01-2

    ///glutTimerFunc(3000,timer,0);///step01-1

    glutDisplayFunc(display);

    glutMainLoop();

}