var season:Number=0;
var SEASON_NONE:Number = 0;
var SEASON_ALL:Number = 5;
var SEASON_SPRING:Number = 10;
var SEASON_SUMMER:Number = 11;
var SEASON_AUTUMN:Number = 12;
var SEASON_WINTER:Number = 13;

var spring_t = 0;
var spring_t_max = 20;
var n_sakuras = 4;

this.onEnterFrame = function(){
	if(season == SEASON_SPRING || season == SEASON_ALL){
		for(var i = 0; i < n_sakuras; i++){
			var t = spring_t - i * spring_t_max / n_sakuras;
			if(t < 0) t += spring_t_max;
			
			var sakura:MovieClip = _level0.spring0["sakura" + i];
			var a = t * 5 + 50;
			if(a >= 100){
				sakura._alpha = 100;
			} else {
				sakura._alpha = a;
			} 
		}
		if(++spring_t >= spring_t_max) spring_t = 0;
	}
	
	if(season == SEASON_SUMMER || season == SEASON_ALL){
		_level0.summer0.sunflower0._rotation +=2;
	}
	
	if(season == SEASON_AUTUMN || season == SEASON_ALL){
		var leaf:MovieClip = _level0.autumn0.leaf0;
		var r:Number = Math.random();
		var rot0:Number = 5;
		if((r < 0.4 && leaf._rotation < rot0) || leaf._rotation <= -rot0){
			leaf._rotation+=1;
		} else if((r < 0.8 && leaf._rotation > -rot0) || leaf._rotation >= rot0){
			leaf._rotation-=1;
		}
	}
	
	if(season == SEASON_WINTER || season == SEASON_ALL){
		for(var i:Number = 0; i < 7; i++){
			var snow:MovieClip = _level0.winter0["snow" + i];
			snow._y += 1;
			var r:Number = Math.random();
			if((r < 0.4 && snow._x < 110) || snow._x < 0){
				snow._x += 1;
			} else if((r < 0.8 && snow._x > 0) || snow._x > 110){
				snow._x -= 1;
			}
			
			if(snow._y > 140){
				snow._y = 10;
			}
			if(snow._y < 30){
				snow._alpha = 5 * (snow._y - 10);
			}
			
			if(snow._y > 120){
				snow._alpha = 5 * (140 - snow._y);
			}
		}
	}
};

season = SEASON_ALL;