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forked from: Draw worm by mouse gesture.

LOVE MATRIX.
a study for drawing curl curve.
license under the GNU Lesser General Public License.
// forked from nutsu's Draw worm by mouse gesture.
// forked from nutsu's Worm matrix based.
/**
LOVE MATRIX.
a study for drawing curl curve.
license under the GNU Lesser General Public License.
*/
package {
    import frocessing.display.F5MovieClip2DBmp;
    import frocessing.geom.FMatrix2D;
    import flash.geom.ColorTransform;
    import flash.geom.*;
    import flash.net.*;
    import flash.events.*;
    import flash.utils.*;
    import flash.display.*;
    import flash.text.*;
    
    public class Main extends MovieClip{
        var mc:WormMatrix2;
        public function Main():void {
            if (stage) init();
            else addEventListener(Event.ADDED_TO_STAGE, init);
        }    
        private function drawBg():void {
            var matrix:Matrix = new Matrix();
            matrix.createGradientBox( 465,465, Math.PI / 2 );

            var linear:String = GradientType.LINEAR;
            var colors:Array = [0x102030, 0x102030, 0x102030];
            var alphas:Array = [1.0, 1.0, 1.0];
            var ratios:Array = [0, 128, 255];
            var spread:String = SpreadMethod.PAD;

            var bg:Shape = new Shape();
            bg.graphics.beginGradientFill( linear, colors, alphas, ratios, matrix, spread );
            bg.graphics.drawRect(0, 0, 465,465);
            bg.graphics.endFill();

            bg.cacheAsBitmap=true;
            
            addChild(bg);
        }
        private function init(e:Event = null):void {
            removeEventListener(Event.ADDED_TO_STAGE, init);
            //drawBg();
            mc=new WormMatrix2();
            addChild(mc);
        }
        /*
        public function mouseMove(ratioX:Number,ratioY:Number,aratioX:Number,aratioY:Number):void {
            mc.mouseMove(465*ratioX, 465*ratioY );
        }
        */
    }

    
    
}

import frocessing.display.F5MovieClip2DBmp;
    import frocessing.geom.FMatrix2D;
    import flash.geom.ColorTransform;
    import flash.geom.*;
    import flash.net.*;
    import flash.events.*;
    import flash.utils.*;
    import flash.display.*;
    import flash.text.*;
class WormMatrix2 extends F5MovieClip2DBmp{
        
        private var vms:Array;
        private var MAX_NUM:int = 100; 
        private var N:Number = 80;
        private var px:Number;
        private var py:Number;
        private var col:uint = 0x000000;
        private var ct:ColorTransform = new ColorTransform(1,1,1,1,4,4,4);
        

        public function WormMatrix2():void 
        {       
            super( false, 0xffffff00 );
            vms = [];
        }
        
        public function check():void
        {
            var x0:Number = mouseX;
            var y0:Number = mouseY;
            var vx:Number = x0 - px;
            var vy:Number = y0 - py;
            var len:Number = min( mag( vx, vy ), 50 );
            
            if( len<10 ) return;
            
            var mtx:FMatrix2D = new FMatrix2D();
            mtx.rotate( atan2( vy, vx ) );
            mtx.translate( x0, y0 );
            
            createObj( mtx, len );
            
            stroke(col)
            line( px, py, x0, y0 );
            px = x0;
            py = y0;
        }
        
        public function createObj( mtx:FMatrix2D, len:Number ):void
        {
            var angle:Number = random(PI/64,PI/6);
            if( Math.random()>0.5 )
                angle *= -1;
            var tmt:FMatrix2D = new FMatrix2D();
            tmt.scale( 0.95, 0.95 );
            tmt.rotate( angle );
            tmt.translate( len, 0 );
            var w:Number = 0.5;
               
            var obj:WormObject = new WormObject();
            obj.c1x = obj.p1x = -w * mtx.c + mtx.tx;
            obj.c1y = obj.p1y = -w * mtx.d + mtx.ty;
            obj.c2x = obj.p2x =  w * mtx.c + mtx.tx;
            obj.c2y = obj.p2y =  w * mtx.d + mtx.ty;
            obj.vmt = mtx;
            obj.tmt = tmt;
            obj.r   = angle;
            obj.w   = len/20;
            obj.count = 0;
                
            vms.push( obj );
            if( vms.length > MAX_NUM )
                vms.shift();
        }
        
        public function setup():void
        {
            size( 465, 465 );
            background(255);
            noStroke();
            px = mouseX;
            py = mouseY;
        }
        
        public function draw():void
        {
            if( isMousePressed )
            {
                background(255);
                vms = [];
            }
            
            noStroke();
            var len:int = vms.length;
            for( var i:int=0; i<len; i++ )
            {
                var o:WormObject = vms[i];
                if( o.count<N ){
                    drawWorm( o );
                    o.count++;
                }else{
                    len--;
                    vms.splice( i, 1 );
                    i--;
                }
            }
            
            check();
            
            bitmapData.colorTransform( bitmapData.rect, ct );
        }
        
        public function drawWorm( obj:WormObject ):void
        {
            
            if( Math.random()>0.9 ){
                obj.tmt.rotate( -obj.r*2 );
                obj.r *= -1;
            }
            obj.vmt.prepend( obj.tmt );
            var cc1x:Number = -obj.w*obj.vmt.c + obj.vmt.tx;
            var cc1y:Number = -obj.w*obj.vmt.d + obj.vmt.ty;
            var pp1x:Number = (obj.c1x+cc1x)/2;
            var pp1y:Number = (obj.c1y+cc1y)/2;
            var cc2x:Number = obj.w*obj.vmt.c + obj.vmt.tx;
            var cc2y:Number = obj.w*obj.vmt.d + obj.vmt.ty;
            var pp2x:Number = (obj.c2x+cc2x)/2;
            var pp2y:Number = (obj.c2y+cc2y)/2;
            beginFill( col );
            moveTo( obj.p1x, obj.p1y );
            curveTo( obj.c1x, obj.c1y, pp1x, pp1y );
            lineTo( pp2x, pp2y );
            curveTo( obj.c2x, obj.c2y, obj.p2x, obj.p2y );
            closePath();
            endFill();
            obj.c1x = cc1x;
            obj.c1y = cc1y;
            obj.p1x = pp1x;
            obj.p1y = pp1y;
            obj.c2x = cc2x;
            obj.c2y = cc2y;
            obj.p2x = pp2x;
            obj.p2y = pp2y;
        }
    }

import frocessing.geom.FMatrix2D;
class WormObject{
    public var c1x:Number;
    public var c1y:Number;
    public var c2x:Number;
    public var c2y:Number;
    public var p1x:Number;
    public var p1y:Number;
    public var p2x:Number;
    public var p2y:Number;
    public var w:Number;
    public var r:Number;
    public var count:int;
    public var vmt:FMatrix2D;
    public var tmt:FMatrix2D;
    public function WormObject(){
        
    }
}