// いろんなところがいいかげん。 package { import flash.display.StageQuality; import flash.display.Sprite; import flash.display.BitmapData; import flash.geom.Point; import flash.events.Event; [SWF(backgroundColor="0")] public class Grass extends Sprite { private var container:Sprite; // 草の入れ物 // 草の設定。 private var leng:uint = 135; private var thickness:Number = .07; private var color_array:Array = []; private var rand_array:Array = []; private var fieldWidth:uint = 350; private var fieldHeight:uint = 300; private var centerX:Number = fieldWidth / 2; private var centerY:Number = fieldHeight / 2; private var space:uint = 15;// 草の間隔 private var w:uint = fieldWidth / space;; private var h:uint= fieldHeight / space;; // 風用のperlinNoise private var perlin_bmd:BitmapData; private var seed:int = Math.round(Math.random() * 100); private var speed:int = 1; // 風の早さ private var offsetPoint:Point = new Point(speed, 0); private var damping:Number = -0.000005; // 風の強さ調整用 // private var focusLength:uint = 500; private var angX:Number = 0; private var angY:Number = 0; public function Grass() { stage.quality = StageQuality.MEDIUM; perlin_bmd = new BitmapData(w, h); for (var r:uint = 0; r < h; r++) { color_array[r] = []; rand_array[r] = []; for (var c:uint = 0; c < w; c++) { color_array[r][c] = RGBtoHEX(Math.round(Math.random() * 34), Math.round(Math.random() * 128) + 102, Math.round(Math.random() * 68)); var randX:Number = Math.random() * (space / 1.5) - (space / 1.5); var randZ:Number = Math.random() * (space / 1.5) - (space / 1.5); rand_array[r][c] = {x:randX, z:randZ}; } } container = new Sprite(); container.x = stage.stageWidth / 2; container.y = stage.stageHeight / 2 + leng / 2; container.addEventListener(Event.ENTER_FRAME, enterFrameHandler); addChild(container); } private function enterFrameHandler(eventObject:Event):void { // perlinNoiseのスクロール offsetPoint.offset(speed, 0); perlin_bmd.perlinNoise(w / 2, h / 2, 1, seed, false, false, 1, true, [offsetPoint]); container.graphics.clear(); angX = (mouseX - 200) / 5 * -1; angY = (mouseY - 200) / 5; // ↑回りすぎないように適当に調整 for (var r:uint = 0; r < h; r++) { for (var c:uint = 0; c < w; c++) { drawGrass(c, 0, r); } } } // 草の描画 private function drawGrass(xp:uint, yp:uint, zp:int):void { var power:Number = perlin_bmd.getPixel(xp, zp) * damping; var controlX:Number = Math.sin(DegToRad(power / 4)) * leng / 4; var controlY:Number = Math.cos(DegToRad(power / 4)) * leng / 1.4 * -1; var topX:Number = Math.sin(DegToRad(power)) * leng + xp * space; var topY:Number = Math.cos(DegToRad(power)) * leng * -1; var posZ:int = zp * space - centerY; var point1:Object = perspective(rotationXY(angX, angY, {x:xp * space - centerX, y:yp, z:posZ})); var point2:Object = perspective(rotationXY(angX, angY, {x:controlX + xp * space - centerX, y:controlY - power / 10, z:posZ})); var point3:Object = perspective(rotationXY(angX, angY, {x:topX - centerX, y:topY, z:posZ})); var point4:Object = perspective(rotationXY(angX, angY, {x:controlX / 2 + xp * space - centerX, y:controlY, z:posZ})); var point5:Object = perspective(rotationXY(angX, angY, {x:leng * thickness + xp * space - centerX, y:yp, z:posZ})); container.graphics.beginFill(color_array[zp][xp], 100); container.graphics.moveTo(point1["x"] + rand_array[zp][xp]["x"], point1["y"] + rand_array[zp][xp]["z"]); container.graphics.curveTo(point2["x"] + rand_array[zp][xp]["x"], point2["y"] + rand_array[zp][xp]["z"], point3["x"] + rand_array[zp][xp]["x"], point3["y"] + rand_array[zp][xp]["z"]); container.graphics.curveTo(point4["x"] + rand_array[zp][xp]["x"], point4["y"] + rand_array[zp][xp]["z"], point5["x"] + rand_array[zp][xp]["x"], point5["y"] + rand_array[zp][xp]["z"]); container.graphics.lineTo(point1["x"] + rand_array[zp][xp]["x"], point1["y"] + rand_array[zp][xp]["z"]); container.graphics.endFill(); } private function RGBtoHEX(r:uint, g:uint, b:uint):int { return (r << 16 | g << 8 | b); } private function DegToRad(nDegree:Number):Number { return (nDegree * Math.PI / 180); } private function perspective(points:Object):Object { var temp:Object = {x:0, y:0}; var nZ:Number = focusLength / (focusLength - points.z); temp.x = points.x * nZ; temp.y = points.y * nZ; return temp; } private function rotationXY(x:Number, y:Number, points:Object):Object { var temp:Object = points; var rX:Number = DegToRad(x); var rY:Number = DegToRad(y); var nY:Number, nX:Number, nZ:Number; nZ = temp.z; nY = temp.y; temp.z = nZ * Math.cos(rY) - nY * Math.sin(rY); temp.y = nY * Math.cos(rY) + nZ * Math.sin(rY); nX = temp.x; nZ = temp.z; temp.x = nX * Math.cos(rX) - nZ * Math.sin(rX); temp.z = nZ * Math.cos(rX) + nX * Math.sin(rX); return temp; } } }