// forked from Saqoosha's Force Field with Bresenham's line // forked from Saqoosha's Force Field package { import __AS3__.vec.Vector; import flash.display.Bitmap; import flash.display.BitmapData; import flash.display.BlendMode; import flash.display.PixelSnapping; import flash.display.Sprite; import flash.display.StageQuality; import flash.events.Event; import flash.events.TimerEvent; import flash.filters.BlurFilter; import flash.filters.ColorMatrixFilter; import flash.geom.ColorTransform; import flash.geom.Matrix; import flash.geom.Point; import flash.utils.Timer; import flash.utils.getTimer; import frocessing.color.ColorHSV; import net.hires.debug.Stats; [SWF(backgroundColor=0x0, frameRate=60)] public class ForceField3 extends Sprite { private static const ZERO_POINT:Point = new Point(); private static const MAP_SCALE:Number = 0.25; private static const TRAIL_SCALE:Number = 2; private static const DRAW_SCALE:Number = 0.5; private var _timer:Timer; private var _seed:Number = new Date().getTime(); private var _offsets:Array = [new Point(), new Point()]; private var _forcemap:BitmapData; private var _count:int = 0; private var _particles:Vector.<Particle>; private var _canvas:BitmapData; private var _fade:BitmapData; private var _darken:ColorMatrixFilter = new ColorMatrixFilter([ 1, 0, 0, 0, -2, 0, 1, 0, 0, -2, 0, 0, 1, 0, -2, 0, 0, 0, 1, 0 ]); private var _blur:BlurFilter = new BlurFilter(2, 2, 1); private var _sparkle:BitmapData; private var _sparkleDrawMatrix:Matrix = new Matrix(0.25, 0, 0, 0.25, 0, 0); private var _drawMatrix:Matrix = new Matrix(DRAW_SCALE, 0, 0, DRAW_SCALE, 0, 0); private var _drawColor:ColorTransform = new ColorTransform(0.1, 0.1, 0.1); public function ForceField3() { this.stage.quality = StageQuality.MEDIUM; this._timer = new Timer(500, 0); this._timer.addEventListener(TimerEvent.TIMER, this._onTimer); this._timer.start(); this._forcemap = new BitmapData(475 * MAP_SCALE, 475 * MAP_SCALE, false, 0x0); this._particles = new Vector.<Particle>(); this._fade = new BitmapData(475 * DRAW_SCALE, 475 * DRAW_SCALE, false, 0x0); var bm:Bitmap = this.addChild(new Bitmap(this._fade, PixelSnapping.AUTO, true)) as Bitmap; bm.scaleX = bm.scaleY = 1 / DRAW_SCALE; this._canvas = new BitmapData(475, 475, true, 0x0); var b:Bitmap = this.addChild(new Bitmap(this._canvas)) as Bitmap; b.blendMode = BlendMode.ADD; this._sparkle = new BitmapData(118, 118, true, 0x0); b = this.addChild(new Bitmap(this._sparkle)) as Bitmap; b.smoothing = true; b.blendMode = BlendMode.ADD; b.scaleX = b.scaleY = 4; this.addEventListener(Event.ENTER_FRAME, this._onEnterFrame); this.stage.addChild(new Stats()); } private function _onTimer(e:TimerEvent = null):void { var t:int = getTimer(); this._offsets[0].x = t / 20; this._offsets[1].y = t / 35; this._forcemap.perlinNoise(150, 150, 2, this._seed, true, true, 3, false, this._offsets); } private var color:ColorHSV = new ColorHSV(0, 0.5); private function _onEnterFrame(e:Event):void { var n:int = 10; while (n--) { var a:Number = getTimer() / 1000 + Math.random() * Math.PI; color.h = (getTimer() / 20000) * 360; var p:Particle = new Particle(237, 237, Math.cos(a), Math.sin(a), color.value); this._particles.push(p); } // var g:Graphics = this._canvas.graphics; // g.clear(); this._canvas.lock(); this._canvas.fillRect(this._canvas.rect, 0x0); n = this._particles.length; while (n--) { p = this._particles[n]; var c:uint = this._forcemap.getPixel(p.x * MAP_SCALE, p.y * MAP_SCALE); p.vx += (((c >> 16) & 0xff) - 0x80) / 0x80 * 0.2; p.vy += (((c >> 8) & 0xff) - 0x80) / 0x80 * 0.2; p.x += p.vx; p.y += p.vy; p.life -= 0.005; if (p.life < 0 || p.x < -50 || p.x > 525 || p.y < -50 || p.y > 525) { this._particles.splice(n, 1); } else { this._drawLine(p.x, p.y, p.x - (p.x - p.px) * TRAIL_SCALE, p.y - (p.y - p.py) * TRAIL_SCALE, p.color, 0.5 * p.life); p.px = p.x; p.py = p.y; } } this._canvas.unlock(); this._sparkle.lock(); this._sparkle.fillRect(this._sparkle.rect, 0x0); this._sparkle.draw(this._canvas, this._sparkleDrawMatrix); this._sparkle.unlock(); if (this._count & 1) { this._fade.lock(); this._fade.draw(this._canvas, this._drawMatrix, this._drawColor, BlendMode.ADD); this._fade.applyFilter(this._fade, this._fade.rect, ZERO_POINT, this._blur); this._fade.unlock(); } if (this._count & 0x4) { this._onTimer(); } this._count++; } private function _drawLine(x0:int, y0:int, x1:int, y1:int, color:int, alpha:Number):void { var steep:Boolean = Math.abs(y1 - y0) > Math.abs(x1 - x0); var tmp:int; if (steep) { tmp = x0; x0 = y0; y0 = tmp; tmp = x1; x1 = y1; y1 = tmp; } if (x0 > x1) { tmp = x0; x0 = x1; x1 = tmp; tmp = y0; y0 = y1; y1 = tmp; } var deltax:int = x1 - x0; var deltay:int = Math.abs(y1 - y0); var error:int = deltax / 2; var ystep:int; var y:int = y0; if (y0 < y1) { ystep = 1; } else { ystep = -1; } for (var x:int = x0; x <= x1; x++) { if (steep) { this._canvas.setPixel32(y, x, color | ((alpha * 0xff) << 24)); } else { this._canvas.setPixel32(x, y, color | ((alpha * 0xff) << 24)); } error = error - deltay; if (error < 0) { y = y + ystep; error = error + deltax; } } } } } class Particle { public var x:Number = 0; public var y:Number = 0; public var px:Number = 0; public var py:Number = 0; public var vx:Number = 0; public var vy:Number = 0; public var life:Number = 2; public var color:uint = 0xffffff; public function Particle(x:Number = 0, y:Number = 0, vx:Number = 0, vy:Number = 0, color:uint = 0xffffff) { this.x = this.px = x; this.y = this.py = y; this.vx = vx; this.vy = vy; this.color = color; } }