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//
//    繋がる点の亜種！！のつもりで作った全然違うもの
//
//    ～彼らは斜めには繋がることができないのです。
//    　　　直角に曲がるのが好きだから仕方がないのです。～
//
//    繋がる点はこちら    
//        http://wonderfl.net/code/7549de9ee8ce403f21c35755c4b99f6d282b2135
//
package 
{
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.Shape;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.display.Graphics;
    import flash.filters.GlowFilter;
    
    /**
     * ...
     * @author okoi
     */
    public class Main extends Sprite 
    {
        private var paths:Array = new Array();
                
        private var bgBmpData:BitmapData;
        private var layer:Shape = new Shape();
        
        public function Main():void 
        {
            if (stage) init();
            else addEventListener(Event.ADDED_TO_STAGE, init);
        }
        
        private function init(e:Event = null):void 
        {
            removeEventListener(Event.ADDED_TO_STAGE, init);
            // entry point
            var i:uint = 0;
            var x:Number;
            var y:Number;

//    背景の線と点の初期配置
            bgBmpData = new BitmapData(stage.stageWidth, stage.stageHeight, false, 0);
            var shape:Shape = new Shape();
            var g:Graphics = shape.graphics;
            g.beginFill(0x000000);
            g.drawRect(0, 0, stage.stageWidth, stage.stageHeight);
            g.endFill();
            g.lineStyle( 1, 0x555555 );
            
            var x_num:int = int(stage.stageWidth / PATH_SPAN);
            for ( i = 0; i < x_num; i++ )
            {
                x = i * PATH_SPAN;
                if ( i % 2 == 0 )    paths.push(new Path(x, stage.stageHeight/2, Path.DIR_UP));
                else                 paths.push(new Path(x, stage.stageHeight / 2, Path.DIR_DOWN));
                
                g.moveTo( x, 0 );    g.lineTo( x, stage.stageHeight );
            }
            var y_num:int = int(stage.stageHeight / PATH_SPAN);
            for ( i = 0; i < y_num; i++ )
            {
                y = i * PATH_SPAN;
                if ( i % 2 == 0 )    paths.push(new Path(stage.stageWidth/2, y, Path.DIR_LEFT));
                else                 paths.push(new Path(stage.stageWidth / 2, y, Path.DIR_RIGHT));
                
                g.moveTo( 0, y );    g.lineTo( stage.stageWidth, y );
            }                    
            
            bgBmpData.draw( shape );
            addChild(new Bitmap(bgBmpData));
            layer.filters = [new GlowFilter(0xFFFFAA,1,4,4,4,4)];
            addChild(layer);
            
            addEventListener( Event.ENTER_FRAME, EnterFrame );
        }
        
        private function EnterFrame(e:Event):void 
        {
            var i:int = 0;
            var j:int = 0;
            var path_num:int = paths.length;
            for ( i = 0; i < path_num; i++ )
            {
                paths[i].Update(stage);
                paths[i].jointLen = 99999999;
            }
            for ( i = 0; i < path_num; i++ )
            {
                var ip:Path = paths[i];
                var no:int = -1;
                
                for ( j = 0; j < path_num; j++ )
                {
                    if ( i == j ) continue;
                    var jp:Path = paths[j];
                    var len:Number = ((jp.posX - ip.posX) * (jp.posX - ip.posX) + (jp.posY - ip.posY) * (jp.posY - ip.posY));
                    if ( ip.jointLen > len )
                    {
                        no = j;
                        ip.jointLen = len;
                    }
                }
                if ( ip.jointNo != no )
                {
                    ip.jointNo = no;
                    ip.Spark();
                }
            }            
            
            var g:Graphics = layer.graphics;
            g.clear();
            for ( i = 0; i < path_num; i++ )
            {
                paths[i].Draw(g,paths);
            }
        }
        
    }
    
}
//////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////
import flash.display.Graphics;
import flash.display.Stage;

const PATH_SPAN:int = 3;

class Path {
    public var defX:Number;
    public var defY:Number;
    public var posX:Number;
    public var posY:Number;
    public var moveX:Number;
    public var moveY:Number;
    
    public var jointNo:int = -1;
    public var jointLen:Number = 99999999;
    public var spark:int = 0;
    
    public    static    const    DIR_UP:int = 0;
    public    static    const    DIR_LEFT:int = 1;
    public    static    const    DIR_DOWN:int = 2;
    public    static    const    DIR_RIGHT:int = 3;
    
    public    var dir:int;
    
    public    var alphaStep:int;
    public    var alpha:Number;

public    function Path(_x:Number, _y:Number, _dir:int) {
        Init(_x, _y, _dir);
    }
    
    public    function Init(_x:Number, _y:Number, _dir:int):void
    {
        posX = _x;
        posY = _y;
        defX = _x;
        defY = _y;
        moveX = 0;
        moveY = 0;
        dir = _dir;
        var rnd:Number = Math.random() * 3 + 2;
        if ( _dir == DIR_UP )    moveY = -1 * rnd;
        if ( _dir == DIR_DOWN )    moveY = 1 * rnd;
        if (_dir == DIR_LEFT)    moveX = -1 * rnd;
        if (_dir == DIR_RIGHT)    moveX = 1 * rnd;
        
        alphaStep = int(Math.random() * 360);
    }
    
    
    public    function Update(stage:Stage):void 
    {
        posX += moveX;
        posY += moveY;
        if ( posX < 0 )    posX = stage.stageWidth;
        if ( posX > stage.stageWidth ) posX = 0;
        if ( posY < 0 ) posY = stage.stageHeight;
        if ( posY > stage.stageHeight ) posY = 0;
        
        alpha = (Math.sin( alphaStep * Math.PI / 180 ) + 1) / 2;
        alphaStep = (alphaStep + 30) % 360;
        
        //spark--;
    }
    
    public    function Draw(g:Graphics,paths:Array):void
    {
    //    g.beginFill( 0xFFFFAA );
    //    g.drawCircle( posX, posY, 1 );
    //    g.endFill();
        
        if ( jointNo != -1 && spark != 0 )
        {
            var jdir:int = paths[jointNo].dir;
            var yy:Number;
            var xx:Number;
            
            g.lineStyle(1, 0xFFFFAA, alpha);
            
            g.moveTo(posX, posY);
            if ( dir == DIR_UP || dir == DIR_DOWN )
            {
                if ( jdir == DIR_LEFT || jdir == DIR_RIGHT )
                {
                    g.lineTo( posX, paths[jointNo].posY );
                }else
                {
                    if ( dir == DIR_UP )    yy = int(posY / PATH_SPAN) * PATH_SPAN;    
                    else                     yy = int((posY+PATH_SPAN) / PATH_SPAN) * PATH_SPAN;    
                    g.lineTo( posX, yy );
                    g.lineTo( paths[jointNo].posX, yy );
                }
            }else
            {
                if ( jdir == DIR_UP || jdir == DIR_DOWN )
                {
                    g.lineTo( paths[jointNo].posX, posY );
                }else
                {
                    if ( dir == DIR_LEFT )    xx = int(posX / PATH_SPAN) * PATH_SPAN;    
                    else                     xx = int((posX+PATH_SPAN) / PATH_SPAN) * PATH_SPAN;    
                    g.lineTo( xx, posY );
                    g.lineTo( xx, paths[jointNo].posY );
                }                
            }
            g.lineTo( paths[jointNo].posX, paths[jointNo].posY );
        }    
    }
    
    public    function Spark():void 
    {
        spark = 10;
    }
}

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