forked from: Line slicer（割れるよ）

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

// forked from a24's Line slicer（割れるよ）
// forked from a24's Line slicer
// 切った後、割れるようにした
package  
{
    import flash.display.Sprite;
    import flash.geom.Point;
    import flash.events.MouseEvent;
    import flash.text.TextField;
    
    [ SWF( width = "465" , height = "465" , backgroundColor = "0x000000" , frameRate = "60" ) ]

    public class Main extends Sprite
    {
        private var _point:Point;
        private var _sliceObj:LineSliceObject;
        private var _line:Sprite = new Sprite();
        
        public function Main() 
        {
            Wonderfl.capture_delay( 5 );
    
            var _tf:TextField = new TextField();
            _tf.x = _tf.y = 6;
            _tf.autoSize = "left";
            _tf.textColor = 0xFFFFFF;
            _tf.text = "Please drag the Stage.";
            addChild( _tf );
            
            var _pointArray:Array = [
                new Point( 0 , 0 ),
                new Point( 265 , 0 ),
                new Point( 265 , 265 ),
                new Point( 0 , 265 )
            ];
            
            var _container:Sprite = new Sprite();
            _sliceObj = new LineSliceObject( stage , _pointArray , 0x3399FF );
            _sliceObj.x = _sliceObj.y = 100;
            _container.addChild( _sliceObj );
            addChild( _container );
            addChild( _line );
            
            stage.addEventListener( MouseEvent.MOUSE_DOWN , mouseDownHandler );
        }
        
        private function mouseDownHandler( e:MouseEvent ):void 
        {
            _point = new Point( stage.mouseX , stage.mouseY );
            
            stage.removeEventListener( MouseEvent.MOUSE_DOWN , mouseDownHandler );
            stage.addEventListener( MouseEvent.MOUSE_UP , mouseUpHandler );
            stage.addEventListener( MouseEvent.MOUSE_MOVE , mouseMoveHandler );
        }
        private function mouseUpHandler( e:MouseEvent ):void 
        {
            _line.graphics.clear();
            
            stage.addEventListener( MouseEvent.MOUSE_DOWN , mouseDownHandler );
            stage.removeEventListener( MouseEvent.MOUSE_UP , mouseUpHandler );
            stage.removeEventListener( MouseEvent.MOUSE_MOVE , mouseMoveHandler );
        }
        
        private function mouseMoveHandler( e:MouseEvent ):void 
        {
            _line.graphics.clear();
            _line.graphics.lineStyle( 2.0 , 0x00FF00 , 1.0);
            _line.graphics.moveTo( _point.x , _point.y );
            _line.graphics.lineTo( mouseX , mouseY );
            _line.graphics.endFill();
        }
    }
}



import flash.display.Sprite;
import flash.display.Stage;
import flash.geom.Point;
import flash.events.MouseEvent;
import caurina.transitions.Tweener;

class LineSliceObject extends Sprite
{
    private var _stage:Stage;
    private var _pointArray:Array;
    private var _color:uint;
    private var _point1:Point;
    private var _point2:Point;
    private var _length:int;
    
    public function LineSliceObject( _stage:Stage , _pointArray:Array , _color:uint ) 
    {
        this._stage = _stage;
        this._pointArray = _pointArray;
        this._color = _color;
        drawRectFromPoint( this , _pointArray , _color );
        
        _stage.addEventListener( MouseEvent.MOUSE_DOWN , mouseDownHandler );
    }
    
    /*
     * ------------------------------------------------------------
     * マウスイベントハンドラ
     * ------------------------------------------------------------
    */
    private function mouseDownHandler( e:MouseEvent ):void 
    {
        _point1 = new Point( _stage.mouseX , _stage.mouseY );
        
        _stage.removeEventListener( MouseEvent.MOUSE_DOWN , mouseDownHandler );
        _stage.addEventListener( MouseEvent.MOUSE_UP , mouseUpHandler );
    }
    private function mouseUpHandler( e:MouseEvent ):void 
    {
        _point2 = new Point( _stage.mouseX , _stage.mouseY );
        slice( _point1 , _point2 );
        
        _stage.removeEventListener( MouseEvent.MOUSE_UP , mouseUpHandler );
    }
    
    /*
     * ------------------------------------------------------------
     * Graphic描画
     * ------------------------------------------------------------
    */
    private function drawRectFromPoint( _target:* , _pointArray:Array , _color:uint ):void
    {
        _target.graphics.beginFill( _color , 1.0 );
        _target.graphics.moveTo( _pointArray[ 0 ].x , _pointArray[ 0 ].y );
        _length = _pointArray.length;
        for ( var i:int = 1; i < _length; i ++ )
        {
            var _point:Point = _pointArray[ i ];
            _target.graphics.lineTo( _point.x , _point.y );
        }
        _target.graphics.endFill();
    }
    
    /*
     * ------------------------------------------------------------
     * スライス
     * ------------------------------------------------------------
    */
    public function slice( _point1:Point , _point2:Point ):void
    {
        var _pt1:Point = globalToLocal( _point1 );
        var _pt2:Point = globalToLocal( _point2 );
        var _newPointArray:Array = [ new Array() , new Array() ];
        var _numCloss:int = 0;
        
        for ( var i:int = 0; i < _length ; i ++ ) 
        {
            var _pt3:Point = _pointArray[ i ];
            var _pt4:Point = ( _pointArray[ i + 1 ] ) ? _pointArray[ i + 1 ] : _pointArray[ 0 ];
            var _clossPt:Point = crossPoint( _pt1 , _pt2 , _pt3 , _pt4 );
            
            _newPointArray[ 0 ].push( _pt3 );
            if ( _clossPt )
            {
                _newPointArray[ 0 ].push( _clossPt );
                _newPointArray[ 1 ].push( _clossPt );
                _newPointArray.reverse();
                _numCloss ++;
            }
        }
        if ( _numCloss == 2 )
        {
            var _newObj1:LineSliceObject = new LineSliceObject( _stage , _newPointArray[ 0 ] , _color );
            var _newObj2:LineSliceObject = new LineSliceObject( _stage , _newPointArray[ 1 ] , Math.random() * 0xFFFF00 );
            _newObj1.x = _newObj2.x = this.x;
            _newObj1.y = _newObj2.y = this.y;
            parent.addChild( _newObj1 );
            parent.addChild( _newObj2 );
            parent.removeChild( this );

            var _vector:Point = _pt2.subtract( _pt1 );
            var _angle:Number = Math.atan2( _vector.y , _vector.x );
            var _force:int = 6;
            var _fx:Number = Math.abs( Math.sin( _angle ) );
            var _fy:Number = Math.abs( Math.cos( _angle ) );
            var _fx1:Number = ( _newPointArray[0][0].x < _newPointArray[1][0].x ) ? -_fx : _fx;
            var _fx2:Number = ( _newPointArray[1][0].x < _newPointArray[0][0].x ) ? -_fx : _fx;
            var _fy1:Number = ( _newPointArray[0][0].y < _newPointArray[1][0].y ) ? -_fy : _fy;
            var _fy2:Number = ( _newPointArray[1][0].y < _newPointArray[0][0].y ) ? -_fy : _fy;
            
            Tweener.addTween( _newObj1 , { x : _newObj1.x + _fx1 * _force , y : _newObj1.y + _fy1 * _force , time : 1 } );
            Tweener.addTween( _newObj2 , { x : _newObj2.x + _fx2 * _force , y : _newObj2.y + _fy2 * _force , time : 1 } );
        }
        else _stage.addEventListener( MouseEvent.MOUSE_DOWN , mouseDownHandler );
    }
    
    /*
     * ------------------------------------------------------------
     * 交点を割り出す
     * ------------------------------------------------------------
    */
    private function crossPoint( _pt1:Point , _pt2:Point , _pt3:Point , _pt4:Point ):Point
    {    
        var _vector1:Point = _pt2.subtract( _pt1 );
        var _vector2:Point = _pt4.subtract( _pt3 );
        
        if ( cross( _vector1, _vector2 ) == 0.0) return null;
        
        var _s:Number = cross( _vector2 , _pt3.subtract( _pt1) ) / cross( _vector2 , _vector1 );
        var _t:Number = cross( _vector1, _pt1.subtract( _pt3 ) ) / cross( _vector1, _vector2 );

        if ( isCross( _s ) && isCross( _t ) )
        {
            _vector1.x *= _s;
            _vector1.y *= _s;
            return _pt1.add( _vector1 );
        }
        else return null;
    }
        
    private function cross( _vector1:Point , _vector2:Point ):Number
    {
        return ( _vector1.x * _vector2.y - _vector1.y * _vector2.x );
    }
    
    public static function isCross( _n:Number ):Boolean
    {
        return ( ( 0 <= _n ) && ( _n <= 1) );
    }
}