forked from: Aqua Typography
/**
* Copyright chenjinglin.xidian ( http://wonderfl.net/user/chenjinglin.xidian )
* MIT License ( http://www.opensource.org/licenses/mit-license.php )
* Downloaded from: http://wonderfl.net/c/imJ3
*/
// forked from uwi's Aqua Typography
package {
import flash.display.*;
import flash.events.*;
import flash.filters.BlurFilter;
import flash.geom.*;
import flash.text.*;
import net.wonderfl.utils.FontLoader;
import com.bit101.components.*;
[SWF(frameRate="60")]
public class Typography extends Sprite {
private const W : Number = stage.stageWidth;
private const H : Number = stage.stageHeight;
private var _tf : TextField; // BitmapData製作用に文字を書くTextField
private var font : String = "Aqua"; // font name
private var _it : TextField;
private var _submit : PushButton;
private var _particles : Array;
private var _tlim : Number; // 終了時刻
private var _canvas : BitmapData; // ここにかく
private var _t : Number; // 経過時間
private var _offset : Number; // 色位相のオフセット
public function Typography() {
Wonderfl.capture_delay(4);
_canvas = new BitmapData(W, H, false, 0x000000);
addChild(new Bitmap(_canvas));
_it = new TextField();
_it.type = "input";
_it.x = 10;
_it.y = 10;
_it.textColor = 0xffffff;
_it.border = true;
_it.borderColor = 0x7f7f7f;
_it.width = 100;
_it.height = 20;
addChild(_it);
_it.text = "wonderfl";
_submit = new PushButton(this, 120, 10, "go!", onSubmit);
_submit.width = 40;
_submit.height = 21;
_submit.enabled = false;
var fl : FontLoader = new FontLoader();
fl.load(font);
fl.addEventListener(Event.COMPLETE, onFontLoaded);
}
// fontがロードされた
private function onFontLoaded(e : Event) : void
{
_tf = new TextField();
_tf.defaultTextFormat = new TextFormat(font, 100);
_tf.autoSize = "left";
_tf.embedFonts = true;
_submit.enabled = true;
stage.addEventListener(MouseEvent.CLICK, onClick);
init();
}
private function onSubmit(e : MouseEvent) : void
{
if(_it.text.length == 0)return;
init();
}
private function onClick(e : MouseEvent) : void
{
if(e.target is TextField || e.target is PushButton)return;
start();
}
// 文字列からパーティクルの経路を作成する
private function init() : void
{
if(_it.text == "")return;
// 白抜き作成
var bmds : Array = [];
for each(var c : String in _it.text.split('')){
if(c == " " || c == " ")continue; // スペースはノーカウント
_tf.text = c;
var bmd : BitmapData = textFieldToBitmap(_tf, 4);
var blurred : BitmapData = new BitmapData(W, H, false, 0xffffff);
// 元のBitmapDataにblurをかけ、さらに元のBitmapDataを描く、というのの繰り返しで
// 文字の周囲を濃くする
bmd.lock();
blurred.lock();
for(var i : uint = 0;i < 10;i++){
blurred.applyFilter(blurred, blurred.rect, new Point(), new BlurFilter(100, 100, 1));
blurred.draw(bmd);
}
// んノックアウトォ！
blurred.draw(bmd, null, null, "invert");
bmd.dispose();
bmds.push(blurred);
}
// パーティクルの経路をつくる
// できた白抜きの黒い部分を経由するように
_particles = [];
for(i = 0;i < 2000;i++){
var xs : Array = [];
var ys : Array = [];
var r : Number = (W + H) / 2;
var theta : Number = Math.random() * 2 * Math.PI;
// 初期値はstageの外
xs.push(W / 2 + r * Math.cos(theta));
ys.push(H / 2 + r * Math.sin(theta));
// 各BitmapDataに対して座標をひとつきめる
for each(bmd in bmds){
while(true){
var x : Number = Math.random() * W;
var y : Number = Math.random() * H;
var pc : uint = bmd.getPixel(x, y) & 0xff;
// 黒いほど採用しやすい
if(Math.random() < 1 - pc / 210)break;
}
xs.push(x);
ys.push(y);
}
// 最後もstageの外
xs.push(W / 2 + r * Math.cos(theta));
ys.push(H / 2 + r * Math.sin(theta));
// スプラインの係数を計算して格納
var xCoes : Object = Spline.calcCoordinate(xs);
var yCoes : Object = Spline.calcCoordinate(ys);
_particles.push(new Particle(xCoes, yCoes));
}
_tlim = bmds.length + 2;
// _bmdsは用済み
for each(bmd in bmds){
bmd.dispose();
}
start();
}
private function start() : void
{
_t = 0;
removeEventListener(Event.ENTER_FRAME, onEnterFrame);
addEventListener(Event.ENTER_FRAME, onEnterFrame);
_offset = Math.random() * 2 * Math.PI;
}
private function onEnterFrame(e : Event) : void
{
_canvas.lock();
// パーティクルの描画
for each(var p : Particle in _particles){
var px : Number = Spline.calc(p.xCoes, _t);
var py : Number = Spline.calc(p.yCoes, _t);
_canvas.setPixel(px, py, 0xffffff);
}
// 色減衰
// 減衰度をまわすことによって色調を変える
_canvas.colorTransform(_canvas.rect,
new ColorTransform(
0.96 + 0.02 * Math.sin(_t + _offset),
0.96 + 0.02 * Math.sin(_t + Math.PI * 2 / 3 + _offset),
0.96 + 0.02 * Math.sin(_t + Math.PI * 4 / 3 + _offset)
));
_canvas.unlock();
_t += 0.009;
if(_t >= _tlim)removeEventListener(Event.ENTER_FRAME, onEnterFrame);
}
// tfを画面の中央に置いてscale倍してBitmapDataに転写
private function textFieldToBitmap(tf : TextField, scale : Number = 1) : BitmapData
{
var bmd : BitmapData = new BitmapData(W, H, true, 0x00ffffff);
var mat : Matrix = new Matrix();
mat.scale(scale, scale);
mat.translate(W / 2 - tf.width * scale / 2, H / 2 - tf.height * scale / 2);
bmd.draw(tf, mat);
return bmd;
}
}
}
class Particle
{
public var xCoes : Object;
public var yCoes : Object;
public function Particle(xCoes : Object, yCoes : Object) : void
{
this.xCoes = xCoes; this.yCoes = yCoes;
}
}
// @see http://www5d.biglobe.ne.jp/~stssk/maze/spline.html
class Spline {
public static function calc(cs : Object, t : Number) : Number
{
var p : int = int(t);
if(p >= cs.a.length)p--;
if(p < 0)p = 0;
var dt : Number = t - p;
return cs.a[p] + (cs.b[p] + (cs.c[p] + cs.d[p] * dt) * dt) * dt;
}
public static function calcCoordinate(a : Array) : Object
{
var n : int = a.length;
var b : Array = [];
var c : Array = [];
var d : Array = [];
var w : Array = [];
var i : int;
c.push(0);
for(i = 1;i < n - 1;i++){
c.push(3 * (a[i + 1] - 2 * a[i] + a[i - 1]));
}
c.push(0);
w.push(0);
for(i = 1;i < n - 1;i++){
var l : Number = 4.0 - w[i - 1];
c[i] = (c[i] - c[i - 1]) / l;
w.push(1.0 / l);
}
for(i = n - 2;i > 0;i--){
c[i] -= c[i + 1] * w[i];
}
for(i = 0;i < n - 1;i++){
d.push((c[i + 1] - c[i]) / 3.0);
b.push(a[i + 1] - a[i] - c[i] - d[i]);
}
b.push(0);
d.push(0);
return {a : a, b : b, c : c, d : d};
}
}