//Arrow3粒子引擎 
/* 星星 */
class star
{
	public:
		/* 位置 */
		float	x;
		float	y;
		float	z;

		int life; /* 生存时间，过则死亡 ,每60帧算一次时间 */
};
/* 特效粒子(有别于星星) */
class grain
{
	public:
		float	dx, dy, dz;
		float	x;
		float	y;
		float	z;
		color_t color;
		int	size;
		int	life;
};

vector<star>	stars;  /* 星星列表 */
vector<grain>	grains; /* 特效粒子列表 */


/* 特效粒子引擎 */
inline void runGrain()
{
	vector<grain>	s_grains;
	grain		t_g;
	int		dz	= 1;
	int		d	= 0;
	if ( grains.size() > MAXGRAINSNUM ) {
		dz = grains.size() / MAXGRAINSNUM;
	}
	for ( grain & g : grains ) {
		g.life--;
		d++;
		g.x	+= g.dx;
		g.y	+= g.dy;
		if ( g.life >= 0 && d % dz == 0 ) {
			s_grains.push_back( g );
		}
	}
	grains = s_grains;
	s_grains.clear();
}


inline void drawGrain()
{
	float px, py;
	for ( grain g : grains ) {
		px	= g.x;
		py	= g.y;
		if ( px - pX + getwidth() / 2 < 0 || py - pY + getheight() / 2 < 0 || px - pX + getwidth() / 2 > getwidth() || py - pY + getheight() / 2 > getheight() )
			continue;
		setcolor( g.color );
		setfillcolor( g.color );
		ege_fillellipse( px - pX - g.size / 2 + getwidth() / 2, py - pY - g.size / 2 + getheight() / 2, g.size, g.size );
	}
}


/*
 * 生成粒子，从左到右参数分别为
 * 粒子数量、粒子位置、粒子中心发散轴线、发散范围（最左到最右） 、最小速度、最大速度、粒子最小大小、粒子最大大小 、粒子最短寿命、粒子最长寿命、粒子透明度(随机情况下使用)、粒子颜色是否随机、不随机的话粒子的统一颜色
 * 参数有关度数的全部是弧度
 */
inline void summonGrains( int num, float x, float y, float r, float rf, float minV, float maxV, int minsize, int maxsize, int minlife, int maxlife, int alpha, bool rcolor, color_t color )
{
	grain	g;
	float	R;
	for ( int n = 0; n < num; n++ ) {
		g.x	= x;
		g.y	= y;
		R	= randomf() * rf - rf / 2 + r;
		J2DtoS2D( g.dx, g.dy, R, random( (float) maxV - minV ) + (float) minV );
		g.size	= random( maxsize - minsize ) + minsize;
		g.life	= random( maxlife - minlife ) + minlife;
		if ( rcolor )
			g.color = EGECOLORA( hsl2rgb( random( 360 ), 1, 0.5 ), alpha );
		else g.color = color;
		grains.push_back( g );
	}
}


/* 星星引擎 */
inline void runStar()
{
	vector<star>	s_stars;
	star		t_s;
	/* 自动补充 */
	while ( stars.size() < STARNUM ) {
		t_s.x		= (pX + random( getwidth() ) - getwidth() / 2);
		t_s.y		= (pY + random( getheight() ) - getheight() / 2);
		t_s.z		= random( MAXVL );
		t_s.life	= STARMINLIFE + random( STARMAXLIFE - STARMINLIFE ) + STARMINLIFE;
		stars.push_back( t_s );
	}
	for ( int i = 0; i < stars.size(); i++ ) {
		t_s = stars[i];
		if ( t_s.life > 0 && t_s.x - pX + getwidth() / 2 >= 0 && t_s.x - pX + getwidth() / 2 <= getwidth() && t_s.y - pY + getheight() / 2 >= 0 && t_s.y - pY + getheight() / 2 <= getheight() ) {
			s_stars.push_back( t_s );
		}
		stars.pop_back();
	}
	stars = s_stars;
	s_stars.clear();
}


/* mode=0绘制玩家以下，反之绘制玩家以上 */
inline void drawStars( bool mode )
{
	float x, y;
	setfillcolor( WHITE );
	setcolor( WHITE );
	for ( int i = 0; i < stars.size(); i++ ) {
		if ( mode ) {
			if ( stars[i].z >= ITEMZ )
				continue;
			perPro( stars[i].x - pX, stars[i].y - pY, stars[i].z, x, y, MAXVL );
			fillellipse( (x+ getwidth() / 2), (y + getheight() / 2), 3, 3 );
		} else {
			if ( stars[i].z < ITEMZ )
				continue;
			perPro( stars[i].x - pX , stars[i].y - pY , stars[i].z, x, y, MAXVL );
			putpixel( (x+ getwidth() / 2), (y+ getheight() / 2), WHITE );
		}
	}
}