Week14,toto

 Week14

step 01-1

1.上課前先安裝好git避免當機

-cd desktop 到桌面

-git clone 網址

-cd 2023graphicsb

-start . 開啟檔案總管

2.在專案中，開心的GLUT專案，命名為week14-1_timer 專案

-先把桌面的freeglut設定好

-開心專案

先打好10行GLUT程式，會出現茶壺

#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();

    

    glutMainLoop();

}

執行時，茶壺會隨著90度旋轉

#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);

    glRotatef(angle,0,0,3);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

int main(int argc,char**argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH)

    glutCreateWindow("week14");

    

    glutTimerFunc(3000,timer,0);

    glutDisplayFunc();

    

    glutMainLoop();

}

開心檔案，命名為week14-2_timer_play

step 01-2

可以利用鍵盤控制茶壺的旋轉

#include <GL/glut.h>

float angle = 0; 

void timer(int t) 

{

    glutTimerFunc(33, timer, t+1); 

    angle += 3; 

    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); 

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

    glutDisplayFunc(display);

    glutMainLoop();

}

step02-1

創一個excel，利用公式算出要的數值

把現在的程式先git備份起來

開心專案，命名為week14-3_timer_alpha_interpolate

撰寫程式碼，可以使茶壺用滑鼠控制到想要的位子，在按空白建使茶壺可以旋轉至指定位子

#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);

    ///glutTimerFunc(3000, timer, 0);

    glutDisplayFunc(display);

    glutMainLoop();

}

再一次推送上git

step03-1