forked from: 雪が降る

雪を降らせる。
必要になったので調べて作った。

by XELF 06 May 2009

• Forked from sakef's 雪が降る
• Diff: 31
• Related works: 3
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// forked from sake's 雪が降る
/*
    雪を降らせる。
    必要になったので調べて作った。
*/

package
{
	import flash.display.Sprite;

	[SWF(width="465", height="465", backgroundColor="0x405060", frameRate="60")]
	public class snows extends Sprite
	{
		public function snows()
		{
			for (var k:int = 0; k < 1000; k++)
				addChild(new snow(stage.stageWidth, stage.stageHeight));
		}
	}
}

import flash.display.Graphics;
import flash.display.Sprite;
import flash.events.Event;
import flash.filters.BlurFilter;

class snow extends Sprite
{
	private var i:Number;
	private var k:Number;
	private var theta:Number;
	private var movieHeight:Number;
	private var movieWidth:Number;
        private var x0:Number;
        private var y0:Number;
        private var y1:Number;
        private static const margin:Number = 5;

	public function snow(w:Number, h:Number)
	{
		movieHeight = h + margin * 2;
		movieWidth = w + margin * 2;
                x0 = -margin;
                y0 = -margin;
                y1 = h + margin;

		i = Math.random() * 1 + 0.5;
		k = 0.02;
                theta = Math.random() * Math.PI - Math.PI;

		graphics.beginFill(0xffffff, 1);
		graphics.drawCircle(0, 0, 3);
		graphics.endFill();
		filters=[new BlurFilter()];

                var a:Number = Math.random();
		scaleX = scaleY = a * 1.5 + 0.1;
		alpha = a * 0.5 + Math.random() * 0.4 + 0.1;

		x = x0 + Math.random() * movieWidth;
		y = y0 + Math.random() * movieHeight;

		addEventListener(Event.ENTER_FRAME, onFrame);
	}

	private function onFrame(e:Event):void
	{
		theta += k;
		x -= Math.cos(theta);
		y += i;

		if (y >= y1)
			y -= movieHeight;
                if (x < x0) {
                    x += movieWidth;
                } else if (x >= movieWidth) {
                    x -= movieWidth;
                }
	}
}