// パーティクル祭りらしいので。 // クリックでピストン移動です。いろいろ怪しげです。 package { import flash.display.*; import flash.events.*; import flash.geom.*; [SWF(width = "465", height = "465", frameRate = "60", backgroundColor = "0x000000")] public class Gas10000 extends Sprite { private const W:int = stage.stageWidth; private const H:int = stage.stageHeight; private const NUMBER_OF_MOLECULES:int = 10000; private var molecules:Vector.<Molecule> = new Vector.<Molecule>(); private var frameBuffer:BitmapData = new BitmapData(W, H, false, 0x00000000); private var colorTransform:ColorTransform; private var world:BitmapData = new BitmapData(W, H, true, 0x00000000); private const T:int = 10; private var map:Vector.<int> = new Vector.<int>(W * H); private const MAP_VOID:int = 0; private const MAP_WALL:int = 1; private const MAP_PISTON:int = 2; private const CYLINDER_X:int = W * 0.15; private const CYLINDER_Y:int = H / 2; private const CYLINDER_LENGTH:int = W * 0.7; private const CYLINDER_RADIUS:int = H * 0.15; private const PISTON_T:int = W * 0.07; private var pistonX:Number = CYLINDER_X + CYLINDER_LENGTH * 0.65; private var pistonVX:Number = 0; private var hud:Shape = new Shape(); public function Gas10000() { drawSolid(MAP_WALL, 0xFFFFFFFF, 0, 0, T, H); drawSolid(MAP_WALL, 0xFFFFFFFF, W - T, 0, T, H); drawSolid(MAP_WALL, 0xFFFFFFFF, 0, 0, W, T); drawSolid(MAP_WALL, 0xFFFFFFFF, 0, H - T, W, T); drawSolid(MAP_WALL, 0xFFEEEEFF, CYLINDER_X, CYLINDER_Y - CYLINDER_RADIUS, T, CYLINDER_RADIUS * 2); drawSolid(MAP_WALL, 0xFFEEEEFF, CYLINDER_X, CYLINDER_Y - CYLINDER_RADIUS - T, CYLINDER_LENGTH, T); drawSolid(MAP_WALL, 0xFFEEEEFF, CYLINDER_X, CYLINDER_Y + CYLINDER_RADIUS , CYLINDER_LENGTH, T); drawPiston(); for (var i:int = 0; i < NUMBER_OF_MOLECULES; i++) { var x:int = Math.random() * W; var y:int = Math.random() * H; if (map[y * W + x] != MAP_VOID) { i--; continue; } // 動きが見えにくいので、酸素のようなものと窒素のようなものに分けてみる。 molecules.push(new Molecule(x, y, i < NUMBER_OF_MOLECULES * 0.2 ? 0xFFFFFF : 0x99AAFF)); } colorTransform = new ColorTransform(1, 1, 1, 1, -120, -120, -120); addChild(new Bitmap(frameBuffer)); addChild(new Bitmap(world)); addChild(hud); stage.addEventListener(MouseEvent.MOUSE_DOWN, mouseDownHandler); stage.addEventListener(MouseEvent.MOUSE_UP, mouseUpHandler); addEventListener(Event.ENTER_FRAME, enterFrameHandler); } private function drawSolid(attribution:int, color:uint, x:int, y:int, w:int, h:int):void { for (var iy:int = y; iy < y + h; iy++) { for (var ix:int = x; ix < x + w; ix++) { map[iy * W + ix] = attribution; } } world.fillRect(new Rectangle(x, y, w, h), color); } private function drawPiston():void { drawSolid(MAP_PISTON, 0xFFEEEEFF, pistonX, CYLINDER_Y - CYLINDER_RADIUS, PISTON_T, CYLINDER_RADIUS * 2); drawSolid(MAP_WALL, 0xFF444466, pistonX + PISTON_T, CYLINDER_Y - T, W - pistonX - PISTON_T, T * 2); } private function erasePiston():void { drawSolid(MAP_VOID, 0x00000000, pistonX, CYLINDER_Y - CYLINDER_RADIUS, PISTON_T, CYLINDER_RADIUS * 2); drawSolid(MAP_VOID, 0x00000000, pistonX + PISTON_T, CYLINDER_Y - T, W - pistonX - PISTON_T, T * 2); } private var isMouseDown:Boolean = false; private function mouseDownHandler(event:MouseEvent):void { isMouseDown = true; } private function mouseUpHandler(event:MouseEvent):void { isMouseDown = false; } private function enterFrameHandler(event:Event):void { frameBuffer.colorTransform(frameBuffer.rect, colorTransform); frameBuffer.lock(); for each(var m:Molecule in molecules) { if (map[int(m.y) * W + int(m.x + m.vx)]) { if (map[int(m.y) * W + int(m.x + m.vx)] == MAP_PISTON) { if (m.x < pistonX + PISTON_T / 2) { m.x = pistonX; } if (m.x > pistonX + PISTON_T / 2) { m.x = pistonX + PISTON_T; } pistonVX += m.vx * 0.008; } m.vx = -m.vx; } m.x += m.vx; if (map[int(m.y + m.vy) * W + int(m.x)]) { m.vy = -m.vy; } m.y += m.vy; frameBuffer.setPixel(m.x, m.y, m.color); } frameBuffer.unlock(); var g:Graphics = hud.graphics; g.clear(); if (isMouseDown) { g.lineStyle(2, 0xFF0000); g.moveTo(pistonX + PISTON_T / 2, CYLINDER_Y); g.lineTo(mouseX, mouseY); pistonVX += (mouseX - pistonX) * 0.008; if (pistonVX > 5) { pistonVX = 5; }; if (pistonVX < -5) { pistonVX = -5; }; } erasePiston(); pistonVX *= 0.7; pistonX += pistonVX; if (pistonX < CYLINDER_X + T + 5) { pistonX = CYLINDER_X + T + 5; } if (pistonX > W - T - PISTON_T) { pistonX = W - T - PISTON_T; } drawPiston(); } } } class Molecule { public var x:Number; public var y:Number; public var vx:Number; public var vy:Number; public var color:uint; private static const SPEED_FACTOR:Number = 4; private static const MAX_SPEED:Number = 10; public function Molecule(x:Number, y:Number, color:uint) { this.x = x; this.y = y; this.color = color; // 正規分布 var speed:Number = Math.sqrt( -2 * Math.log(1 - Math.random())) * SPEED_FACTOR; // すり抜け防止 if (speed > MAX_SPEED) { speed = MAX_SPEED; } var angle:Number = 2 * Math.PI * Math.random(); vx = Math.cos(angle) * speed; vy = Math.sin(angle) * speed; } }