// forked from PESakaTFM's Bezier - Closed Loop - Animated // forked from PESakaTFM's Bezier - Closed Loop package { import flash.display.Bitmap; import flash.display.BitmapData; import flash.display.Graphics; import flash.display.Sprite; import flash.events.Event; import flash.filters.ColorMatrixFilter; import flash.geom.Point; import frocessing.color.ColorRGB; [SWF (backgroundColor = "0x0", frameRate = "30", width = "465", height = "465")] public class Bezier extends Sprite { public const NUM_POINTS:int = 5; public const NUM_LOOPS:int = 2; public var colors:Vector.<ColorRGB> = new Vector.<ColorRGB>(); public var pts:Vector.<Vector.<Point>> = new Vector.<Vector.<Point>>(); public var vel:Vector.<Vector.<Point>> = new Vector.<Vector.<Point>>(); public var val:Number = .9; public var fade:ColorMatrixFilter = new ColorMatrixFilter([val,0,0,0,0, 0,val,0,0,0, 0,0,val,0,0, 0,0,0,1,0]); public var bmd:BitmapData = new BitmapData(465, 465, false, 0x0); public var bmp:Bitmap = new Bitmap(bmd); public var mc:Sprite = new Sprite(); public function Bezier() { var i:int=0; addChild(bmp); for(var j:int=0; j<NUM_LOOPS; j++) { colors[j] = new ColorRGB((j&1)*255, Math.round(Math.random())*255, ((j+1)&1)*255); pts[j] = new Vector.<Point>(); vel[j] = new Vector.<Point>(); for(i=0; i<NUM_POINTS; i++) { pts[j][i] = new Point(465*Math.random() >> 0, 465*Math.random() >> 0); vel[j][i] = new Point(Math.random()*8-4, Math.random()*8-4); } } draw(); stage.addEventListener(Event.ENTER_FRAME, onEnter); } public function onEnter(event:Event):void { var c:ColorRGB; var i:int=0; for(var j:int=0; j<NUM_LOOPS; j++) { for(i=0; i<NUM_POINTS; i++) { pts[j][i].x += vel[j][i].x; if(pts[j][i].x > 465) { pts[j][i].x -= pts[j][i].x-465; vel[j][i].x *= -1; } else if(pts[j][i].x < 0) { pts[j][i].x *= -1; vel[j][i].x *= -1; } pts[j][i].y += vel[j][i].y; if(pts[j][i].y > 465) { pts[j][i].y -= pts[j][i].y-465; vel[j][i].y *= -1; } else if(pts[j][i].y < 0) { pts[j][i].y *= -1; vel[j][i].y *= -1; } } c = colors[j]; if(c.r == 255) { if(c.b > 0) c.b--; else if(c.g < 255) c.g++; else c.r--; } else if(c.g == 255) { if(c.r > 0) c.r--; else if(c.b < 255) c.b++; else c.g--; } else if(c.b == 255) { if(c.g > 0) c.g--; else if(c.r < 255) c.r++; else c.b--; } } draw(); } public function drawClosedLoop(pnts:Vector.<Point>, accuracy:int=20):void { var p:Vector.<Point> = new Vector.<Point>(3,true); for(var i:int=0; i<pnts.length-2; i++) { p[0] = Point.interpolate(pnts[i], pnts[i+1], .5); p[1] = pnts[i+1]; p[2] = Point.interpolate(pnts[i+1], pnts[i+2], .5); drawCurve(p, accuracy); } p[0] = Point.interpolate(pnts[i], pnts[i+1], .5); p[1] = pnts[i+1]; p[2] = Point.interpolate(pnts[i+1], pnts[0], .5); drawCurve(p, accuracy); i++; p[0] = Point.interpolate(pnts[i], pnts[0], .5); p[1] = pnts[0]; p[2] = Point.interpolate(pnts[0], pnts[1], .5); drawCurve(p, accuracy); } public function drawCurve(pnts:Vector.<Point>, accuracy:int=20):void { var g:Graphics = mc.graphics; var a:int; var p:Point; g.moveTo(pnts[0].x, pnts[0].y); for(a=0; a <= accuracy; a++) { p = getPointAt(pnts, a/accuracy); g.lineTo(p.x, p.y); } } protected function getPointAt(pnts:Vector.<Point>, t:Number):Point { var n:int = pnts.length-1; var m:Number = Math.pow((1-t), n); var p:Point = new Point(pnts[0].x * m, pnts[0].y * m); for(var i:int=1; i<=n; i++) { m = Math.pow((1-t), n-i)*bc(n, i)*Math.pow(t, i); p = p.add(new Point(pnts[i].x * m, pnts[i].y * m)); } return p; } protected function bc(n:int, k:int):int // Binomial Coefficient { return (f(n)/(f(k)*f(n-k))); } protected function f(value:int):int // Factorial { var i:int = value; var result:int = 1; for(; i>0; i--) { result *= i; } return result; } protected function draw():void { mc.graphics.clear(); for(var j:int=0; j<NUM_LOOPS; j++) { mc.graphics.lineStyle(1,colors[j].value); drawClosedLoop(pts[j]); mc.graphics.endFill(); } bmd.applyFilter(bmd, bmd.rect, new Point(), fade); bmd.draw(mc); } } }