forked from: 絡まないの？ forked from: Snake

/**
 * Copyright jmbyh521 ( http://wonderfl.net/user/jmbyh521 )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/SKH9
 */

// forked from Kay's 絡まないの？ forked from: Snake
// forked from SeeDa's Snake
// forked from SeeDa's Hairs
/*
 * マウスを追うヘビ
 * drawPathやめました
 */
package {
    import flash.display.*;
    import flash.geom.*;
    import flash.events.*;
    [SWF(width="465",height="465",backgroundColor="0x33aa66",frameRate="60")]
    
    public class Main extends Sprite {
        public function Main():void {
            for (var i:uint = 0; i < 10; i++) {
                var snake:Snake = new Snake();
                addChild(snake);
                snake.x = Math.random()*465;
                snake.y = Math.random()*465;
            }
            Wonderfl.capture_delay( 30 );
        }
    }
}

import flash.display.*;
import flash.events.*;
import flash.geom.*;
import flash.filters.*;
class Snake extends Sprite {
    
    private var nSpeed:Number;
    private var nColor:uint;
    private var points:Vector.<Number> = new Vector.<Number>();
    private var commands:Vector.<int> = new Vector.<int>();
    private var pointsNum:uint = 60;
    private var pointDist:Number = 4;
    private var vibration:Number = 0;
    private var headP:Point;
    private var dsFilter:DropShadowFilter = new DropShadowFilter(2,30,0x668866,1);
    
    public function Snake():void {
        nSpeed   = Math.random()*5+2;
        vibration = Math.random()*Math.PI;
        nColor = 0xffffff;
        
        commands.push(1);
        points.push(mouseX,mouseY);
        headP = new Point(mouseX,mouseY);
        
        for (var i:uint = 1; i < pointsNum; i++) {
            points.push(mouseX, mouseY);
            commands.push(2);
        }
        addEventListener(Event.ENTER_FRAME, xMove);
    }
    private function xMove(e:Event):void {
        // ターゲットまでの距離を求める
        var mX:Number = mouseX;
        var mY:Number = mouseY;
        var dist:Number = Point.distance(new Point(headP.x,headP.y), new Point(mX, mY));
        
        if(dist > 30) {
            // ターゲットへの角度を求める
            var radian:Number = Math.atan2(mY-headP.y, mX-headP.x);
            
            // 振動値を加える
            var vibR:Number = radian+Math.PI/2;
            var vibX:Number = (50 * Math.cos(vibR)) * Math.sin(vibration);
            var vibY:Number = (50 * Math.sin(vibR)) * Math.sin(vibration);
            // 移動
            points[0] = headP.x + Math.cos(radian)*nSpeed;
            points[1] = headP.y + Math.sin(radian)*nSpeed;
            headP = new Point(points[0],points[1]);
            vibration+=0.2;
            points[0] += vibX;
            points[1] += vibY;
            // 2番目以降の点を移動する
            for (var i:uint = 1; i < pointsNum; i++) {
                var tP:Point = new Point(points[i*2-2], points[i*2-1]);
                var cP:Point = new Point(points[i*2], points[i*2+1]);
                dist = Point.distance(tP,cP);
                if (dist > pointDist) {
                    var dX:Number = tP.x - cP.x;
                    var dY:Number = tP.y - cP.y;
                    var rad:Number = Math.atan2(dX,dY);
                    dist -= pointDist;
                    points[i*2] += Math.sin(rad) * dist;
                    points[i*2+1] += Math.cos(rad) * dist;
                }
            }
            // 再描画
            graphics.clear();
            graphics.lineStyle(8,nColor);
            graphics.moveTo(points[0],points[1]);
            for (i = 1; i < pointsNum; i++) {
                if (i > pointsNum-40) {
                    graphics.lineStyle(8*(pointsNum-i)/(pointsNum-40)/2,nColor);
                }
                graphics.lineTo(points[i*2],points[i*2+1]);
                
            }
            // 目玉をつけてみよう
            var eyeR:Number = Math.atan2(points[3]-points[1],points[2]-points[0]) + Math.PI/2;
            var eyeX:Number = (4 * Math.cos(eyeR));
            var eyeY:Number = (4 * Math.sin(eyeR));
            var headX:Number = (points[0]+points[2])/2;
            var headY:Number = (points[3]+points[1])/2;
            graphics.lineStyle(0,0,0);
            graphics.beginFill(0xff6666);
            graphics.drawCircle(headX+eyeX, headY+eyeY, 2);
            graphics.drawCircle(headX-eyeX, headY-eyeY, 2);
            filters = [dsFilter];
        }
    }
}