/*單人足球的初始化工作*/

void InitPitch(FootballPitch *pitch);
void DrawPitch(FootballPitch *pitch);
void InitBall(Football *ball,FootballPitch pitch);
int InitRobot(Robot *dubuying,FootballPitch pitch,Football ball);
int InitIndicator(Football *ball,Robot *dubu);

void InitPitch(FootballPitch *pitch)
{
    pitch->color=GREEN;
    pitch->position[0]=70;
    pitch->position[1]=60;
    pitch->position[2]=570;
    pitch->position[3]=390;
}

void DrawPitch(FootballPitch *pitch)
{
    setfillstyle(1,pitch->color);
    bar(50,50,590,400);
    setlinestyle(0,0,2);
    line(90,60,550,60);
    line(90,390,550,390);
    line(70,80,70,370);
    line(570,80,570,370);
    line(90,60,70,80);
    line(550,60,570,80);
    line(70,370,90,390);
    line(570,370,550,390);
    line(320,60,320,390);
    circle(320,225,40);
    rectangle(70,120,160,330);
    rectangle(480,120,570,330);
    rectangle(70,170,110,280);
    rectangle(530,170,570,280);
    arc(125,225,0,45,50);
    arc(125,225,315,360,50);
    arc(515,225,135,180,50);
    arc(515,225,180,225,50);
    setlinestyle(0,0,1);
    setfillstyle(8,WHITE);
    bar(55,200,70,250);
    bar(570,200,585,250);
    setcolor(WHITE);
}

void InitBall(Football *ball,FootballPitch pitch)
{
    float x,y;

    randomize();
    ball->init_speed=2.5;
    ball->radius=3;
    ball->color=WHITE;
    ball->ball_x=(pitch.position[0] + pitch.position[2]) / 2 + 150;
    ball->ball_y=(pitch.position[1] + pitch.position[3]) / 2 + 100;
    do{
        x=random(50);
        y=random(50);
    }while(x>y);
    ball->direction_angle=(x/y)*2*PI;
    ball->friction_factor=0.02;
}

int InitRobot(Robot *dubuying,FootballPitch pitch,Football ball)
{
    dubuying->number=1;
    dubuying->team='A';
    dubuying->sidelength=20;
    dubuying->color=RED;
    dubuying->position_x=(pitch.position[0]+pitch.position[2])/2;
    dubuying->position_y=(pitch.position[1]+pitch.position[3])/2;
    dubuying->small_speed=2;
    dubuying->big_speed=2.2;
    dubuying->forward_speed=1.8;
    dubuying->decline=(dubuying->big_speed - dubuying->small_speed)/(dubuying->sidelength/2);
    dubuying->reverse_radius=dubuying->sidelength/2*sqrt(2);
    dubuying->direction_indicator=0;

    return 0;
}

int InitIndicator(Football *ball,Robot *dubu)
{
    if(ball->ball_x > dubu->position_x)
        dubu->direction_indicator = 0;
    else    dubu->direction_indicator = PI;

    return 0;
}