flash on 2010-10-27

/**
 * Copyright hacker_y48qdmdh ( http://wonderfl.net/user/hacker_y48qdmdh )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/zGPh
 */

package {
    import flash.ui.Keyboard;
    import flash.events.KeyboardEvent;
    import flash.events.Event;
    import flash.display.Graphics;
    import flash.display.Sprite;
    public class FlashTest extends Sprite {
        public function FlashTest() {
            // write as3 code here..
            
           
            
            stage.addEventListener( Event.ENTER_FRAME, this.enterframe );
            stage.addEventListener( KeyboardEvent.KEY_DOWN, this.key_down_event );
            
        }
        
        
        private var line_length:Number = 100;
        private var line_p0:Vector2 = new Vector2();
        private var line_p1:Vector2 = new Vector2();
        
        private var circle_center:Vector2 = new Vector2(200, 200);
        private var circle_radius:Number = 100;
        
        private function ctrl():void {
            
            this.line_p0.x = mouseX;
            this.line_p0.y = mouseY;

            this.line_p1.x = this.line_p0.x - this.line_length;
            this.line_p1.y = this.line_p0.y;
            
            // 計算
            var p0:Vector2 = this.line_p0;
            var p1:Vector2 = this.line_p1;
            var p:Vector2 = this.circle_center;
            
            var v:Vector2 = p1.sub( p0 );
            var a:Vector2 = p.sub( p0 );
            var inner:Number = v.dot( a );
            var v2:Number = v.lengthSquared();
            var a2:Number = a.lengthSquared();
            
           //var t:Number = inner / l2;
            
        }

        private fucntion eject_c( p:Vector2, center:Vector2, r:Number ):Vector2 {
            var ret:Vector2 = null;
            
            var v:Vector2 = p.sub( center );
            var l2 = v.lengthSquared();
            
            if( l2 > r*r ){
                var l:Number = Math.sqrt( l2 );
                if( l > 0 ){
                    ret = v.multi( (r-l)/l );
                }
            }
            
            return ret;
        }
      
        
        

        private function key_down_event( event:KeyboardEvent ):void {
            switch( event.keyCode ) {
                case Keyboard.UP:
                this.line_length += 5;
                break;

                case Keyboard.DOWN:
                this.line_length -= 5;
                break;
            }
        }

        
        private function disp():void{
             var g :Graphics = graphics;
             
             g.clear();
             
             // circle
             g.lineStyle( 0x0, 0x0 );
             g.drawCircle( this.circle_center.x, this.circle_center.y, this.circle_radius );
             // center         
             g.moveTo( this.circle_center.x - 5, this.circle_center.y );
             g.lineTo( this.circle_center.x + 5, this.circle_center.y );
             g.moveTo( this.circle_center.x, this.circle_center.y - 5 );
             g.lineTo( this.circle_center.x, this.circle_center.y + 5 );
             
             // line
             g.moveTo( this.line_p0.x, this.line_p0.y );
             g.lineTo( this.line_p1.x, this.line_p1.y );
             
             
    
             
        }

        private function enterframe( event:Event ):void {
            this.ctrl();
            this.disp();
        }




    }
}

class Vector2 {
    public var x:Number = 0;
    public var y:Number = 0;
       
    
    // コンストラクタ
    public function Vector2( in_x:Number =0, in_y:Number =0 ) {
        this.x = in_x;
        this.y = in_y;
    }

    public function set( in_x:Number =0, in_y:Number =0 ):void {
        this.x = in_x;
        this.y = in_y;
    }
    // 和算
    //public function add( that:Vector2 ):Vector2 {
        //var ret:Vector2 = new Vector2( this.x + that.x, this.y + that.y );
        //
        //return ret;
    //}
    public function add_equal( that:Vector2 ):void {
        this.x += that.x;
        this.y += that.y;
    }
    
    // 減算
    public function sub( that:Vector2 ):Vector2 {
        var ret:Vector2 = new Vector2( this.x - that.x, this.y - that.y );
        
        return ret;
    }
    public function sub_equal( that:Vector2 ):void {
        this.x -= that.x;
        this.y -= that.y;
    }
    
    // 乗算
    public function multi( num:Number ):Vector2 {
        var ret:Vector2 = new Vector2( this.x * num, this.x * num );
        
        return ret;
    }
    public function multi_equal( num:Number ):void {
        this.x *= num;
        this.y *= num;
    }

    // 除算
    public function div( num:Number ):Vector2 {
        var ret:Vector2 = new Vector2( this.x / num, this.x / num );
        
        return ret;
    }
    public function div_equal( num:Number ):void {
        this.x /= num;
        this.y /= num;
    }

    // クローン作成
    public function copy():Vector2 {
        var ret:Vector2 = new Vector2( this.x, this.y );
        
        return ret;
    }
    
    // 値コピー
    public function equal( src:Vector2 ):void {
        this.x = src.x;
        this.y = src.y;
    }
    
    public function dot( that:Vector2 ):Number{
        return this.x*that.y + this.y*that.x;
    }
    
    public function lengthSquared( ):Number{
        return this._x*this.x + this.y*this.y;
    }


}