int important(Football *ball,Robot *dubu,FootballPitch *pitch);

/*單人足球的核心部分*/
int important(Football *ball,Robot *dubu,FootballPitch *pitch)
{
    int size1,size2,i,x;
    void *buffer1,*buffer2;

    InitIndicator(ball,dubu);
    for(i=0; ;i++)
    {   /*球的運動*/
        ball->init_speed -= ball->friction_factor;
        if((ball->init_speed) > 0.1)
        {
            ball->ball_x += (ball->init_speed) * cos(ball->direction_angle);
            ball->ball_y -= (ball->init_speed) * sin(ball->direction_angle);
        }

        /*判斷球是否在機器人的正對面*/
        x=WhetherInView(ball,dubu);

        /*向球的方向旋轉*/
        if(x==1)
            TurnToBall(ball,dubu);
        else    MoveToBall(ball,dubu);

        size1 = imagesize(ball->ball_x - ball->radius,ball->ball_y - ball->radius,ball->ball_x + ball->radius,ball->ball_y + ball->radius);
        buffer1 = malloc(size1);
        getimage(ball->ball_x - ball->radius,ball->ball_y - ball->radius,ball->ball_x + ball->radius,ball->ball_y + ball->radius,buffer1);
        size2 = imagesize(dubu->position_x - dubu->reverse_radius,dubu->position_y - dubu->reverse_radius,dubu->position_x + dubu->reverse_radius,dubu->position_y + dubu->reverse_radius);
        buffer2 = malloc(size2);
        getimage(dubu->position_x - dubu->reverse_radius,dubu->position_y - dubu->reverse_radius,dubu->position_x + dubu->reverse_radius,dubu->position_y + dubu->reverse_radius,buffer2);
        DrawBall(ball);
        DrawRobot(dubu);
        delay(15);

        /*當球發生碰撞后新的角度和速度*/
        WhetherReflect(ball,dubu,pitch,i);

        /*判斷是否進球*/
        if(fabs(ball->ball_x - 55) <= 4 || fabs(ball->ball_x - 585) <= 4)
            break;
        else if(fabs(ball->ball_y - 200) <= 4 && (ball->ball_x < 70 || ball->ball_x > 570))
            break;
        else if(fabs(ball->ball_y - 250) <= 4 && (ball->ball_x < 70 || ball->ball_x > 570))
            break;

        putimage(ball->ball_x - ball->radius,ball->ball_y - ball->radius,buffer1,COPY_PUT);
        putimage(dubu->position_x - dubu->reverse_radius,dubu->position_y - dubu->reverse_radius,buffer2,COPY_PUT);

        free(buffer1);
        free(buffer2);
    }
    free(buffer1);
    free(buffer2);
    setcolor(RED);
    settextstyle(0,0,5);
    settextjustify(1,1);
    outtextxy(320,430,"GOAL!");
    setcolor(WHITE);
    return 0;
}