Lwy_week13

 ##week13

##week13-1_glm_gundam_keyboard_angleID_mouse_motion_angle

0.開新的專案

1.安裝opencv

2.重開codeblocks，3個設定

再把上周的week12-3拿來用

從暫停的地方繼續轉動

##week13-2_FILE_fopen_fprintf_fscanf

1.複製week13-1

2.要加FILE指標

```cpp

FILE*fin=NULL;

FILE*fout=NULL;

```

3.在motion()裡，要加一段程式

```cpp

void motion (int x,int y){

    angle[angleID]+=y-oldY;

    oldX=x;

    oldY=y;

    glutPostRedisplay();

    if(fout==NULL) fout=fopen("angle.txt","w+");    

    for(int i=0;i<20;i++){

    printf("%.1f",angle[i]);

    fprintf(fout,"%.1f",angle[i]);

}

printf("\n");

fprintf(fout,"\n");

}

```

執行程式的時候，用mouse motion一邊改變角度，一邊大量產生角度值，

小黑掉後，可在目錄裡看到angle.txt裡面就是剛剛印的一對數值

 (printf("%.1f ",angle[i]);

        fprintf(fout, "%.1f ",angle[i]);)

f 後面要有空格!!!

現在要讀

```cpp

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

    if(key=='r'){

        if(fin==NULL) fopen("angle.txt","r");

        for(int i=0;i<20;i++){

            fscanf(fin,"%f",&angle[i]);

        }

        glutPostRedisplay();

    }

    if(key=='0') angleID=0;

    if(key=='1') angleID=1;

    if(key=='2') angleID=2;

    if(key=='3') angleID=3;

}

```

長按r可以轉動手臂