forked from: forked from: forked from: Explosion
Hellow Snow!!!
// forked from yd_niku's forked from: Explosion
// forked from Saqoosha's Explosion
// forked from nitoyon's Hello Snow!!!
// Hellow Snow!!!
// forked from Saqoosha's Snow
package {
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.BlendMode;
import flash.display.PixelSnapping;
import flash.display.Sprite;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.filters.BlurFilter;
import flash.geom.Matrix;
import flash.geom.Point;
import flash.geom.Rectangle;
import flash.text.TextField;
import flash.text.TextFieldAutoSize;
import flash.text.TextFormat;
[SWF(width=465, height=465, backgroundColor=0x0, frameRate=120)]
public class Main extends Sprite {
private static const WIND_X:Number = 10;
private static const WIND_Y:Number = -15
private static const GRAVITY:Number = 10;
private static const START_Y:Number = 10;
private var _canvas:BitmapData;
private var _textBmp:BitmapData;
private var _glow:BitmapData;
private var _glowMtx:Matrix;
private var _snow:Array;
private var _snow_prepare:Array;
private var _text:TextField;
private var _log:TextField;
public function Main() {
stage.scaleMode = "noScale";
_text = new TextField();
_text.defaultTextFormat = new TextFormat('Verdana', 48, 0xffffffff, true);
_text.autoSize = "left";
_text.text = "Wonderfl!!!";
_text.x = (465 - _text.width) / 2;
_text.y = (465 - _text.height) /2;
_textBmp = new BitmapData(465, 465, false, 0x000000);
this._canvas = new BitmapData(465, 465, false, 0x000000);
this.addChild(new Bitmap(this._canvas));
this._snow = [];
this._snow_prepare = [];
/*this._glow = new BitmapData(465 / 4, 465 / 4, false, 0x0); // キラキラを描く用のん。カンバスの 4 分の 1 のサイズ
var bm:Bitmap = this.addChild(new Bitmap(this._glow, PixelSnapping.NEVER, true)) as Bitmap; // smoothing を true にして配置
//bm.scaleX = bm.scaleY = 4; // 4 倍にする。
bm.blendMode = BlendMode.ADD; // 加算モードで合成
this._glowMtx = new Matrix(0.25, 0, 0, 0.25);*/
this.addEventListener(Event.ENTER_FRAME, this.update);
this.init();
this._log = this.addChild(new TextField()) as TextField;
this._log.defaultTextFormat = new TextFormat('Verdana', 12, 0xffffff, true);
this._log.width = 100;
}
public function init():void {
_textBmp.draw(_text, _text.transform.matrix);
var rect:Rectangle = _textBmp.getColorBoundsRect(0xffffff, 0x0, false);
for(var x:int = rect.left; x <= rect.right; x++){
for(var y:int = rect.top; y <= rect.bottom; y++){
var col:uint = _textBmp.getPixel(x, y);
if(col != 0x000000){
var p:SnowParticle = new SnowParticle(x, y, col, 0, 0);
_snow_prepare.push(p);
_snow.push(p);
}
}
}
this.stage.addEventListener(MouseEvent.CLICK, this._onClick);
}
public function _onClick(e:MouseEvent):void {
// emit
var n:int = this._snow_prepare.length;//Math.min(20, _snow_prepare.length);
var mx:int = this.stage.mouseX;
var my:int = this.stage.mouseY;
for(var i:int = 0; i < n; i++){
// var index:int = Math.random() * Math.min(30, _snow_prepare.length);
// var particle:SnowParticle = _snow_prepare[index];
var p:SnowParticle = this._snow_prepare[i];
var dx:Number = p.x - mx + Math.random() * 5;
var dy:Number = p.y - my + Math.random() * 5;
var d:Number = dx * dx + dy * dy;
var sqd:Number = Math.sqrt(d);
var r:Number = Math.random() * 1 + 0.2;
p.ax = (dx / sqd * r) * -1;
p.ay = (dy / sqd * r) * -1;
r = Math.random() * 2;
p.vx = p.ax * r;
p.vy = p.ay * r;
// _textBmp.setPixel(p.x, p.y, 0x000000);
}
this._snow_prepare = [];
}
// 雪を動かすよーー
public function update(e:Event):void {
this._canvas.lock(); // いっぱい setPixel するときは必ず lock しよう
this._canvas.fillRect(this._canvas.rect, 0x0); // カンバスをクリア
// this._canvas.copyPixels(_textBmp, _textBmp.rect, new Point(0, 0));
var n:int = this._snow.length;
var d:Number = 1.0;
// var wind_x:Number = (Math.random() > .4 ? WIND_X : 0) / 1000;
// var wind_y:Number = (GRAVITY + (Math.random() > .6 ? WIND_Y : WIND_Y / 2)) / 1000;
while (n--) {
var p:SnowParticle = this._snow[n];
p.vx += p.ax;
p.vy += p.ay;
p.vx *= 0.99; // 空気抵抗
p.vy *= 0.99; // y 方向にも
p.x += p.vx; // 動かす
p.y += p.vy;
this._canvas.setPixel(p.x, p.y, p.c); // 雪 1 粒描く
if (p.y < 0 || this.stage.stageHeight < p.y || p.x < 0 || this.stage.stageWidth < p.x) { // もし画面外にでちゃったら
this._snow.splice(n, 1); // とりのぞく
}
}
this._canvas.unlock(); // lock したやつは必ず unlock
//this._glow.draw(this._canvas, this._glowMtx); // キラキラを描く
//
this._log.text = String(this._snow.length);
if(_snow.length == 0){
this.init();
}
}
}
}
class SnowParticle {
public var x:Number;
public var y:Number;
public var vx:Number;
public var vy:Number;
public var ax:Number;
public var ay:Number;
public var c:int;
public function SnowParticle(x:Number, y:Number, color:uint, vx:Number, vy:Number) {
this.x = x;
this.y = y;
this.vx = vx;
this.vy = vy;
this.ax = 0;
this.ay = 0;
this.c = color;
}
}