2311/091
AS3-Captcha验证码类
忽然想做个Flash版的验证码，于是就做了，先来看下Demo：
哈哈，是不是觉得最后那个验证码很变态=。=
来看下Demo部分的代码：
import org.nwhy.utils.Captcha;
var cpTypes:Array=["number","character","math","bt"];
var aryCps:Array=[];
var cpNum:uint=4;
init();
function init() {
for (var i:uint=0; i<cpnum ; i++) {
var cp:Captcha=new Captcha(cpTypes[i]);
cp.x=130;
cp.y=40*i+15;
cp.addEventListener("change",cpChange);
addChild(cp);
aryCps.push(cp);
this["txt_ipt"+i].addEventListener("change",iptChange);
}
}
function cpChange(_e:Event) {
var obj:Captcha=_e.currentTarget as Captcha;
trace(obj.captcha);
}
function iptChange(_e:Event) {
var obj:TextField=_e.currentTarget as TextField;
var num:uint=_e.currentTarget.name.substr(7);
if (obj.text==aryCps[num].captcha) {
this["txt_msg"+num].text="验证通过";
} else {
this["txt_msg"+num].text="验证失败";
}
}
Captcha类代码如下：
/*
VERSION: 1.0 DATE:2009/11/20
ACTIONSCRIPT VERSION: 3.0
AUTHOR: DFdou, k5love@foxmail.com
Copyright 2009, nwhy.org. All rights reserved.
DESCRIPTION:
Captcha is a simple class to generate Caphtcha Sprite.
PARAMETERS:
1) type:String="number": Captcha type you want to create, there are four types ["number","character","math","bt"];
2) length:uint=5: Captcha length,work with type ["number","character"];
3) noiseFlag:Boolean=true: if true Captcha will draw noise;
4) size:uint=18: textfiled's fontsize;
NOTES:
- when the Captcha was changed,will dispatch an event named "change",then you can addEventListener to capture it.
EXAMPLE:
var cp:Captcha = new Captcha(); //default Captcha as number type width noise,length=5,size=18;
var cp:Captcha = new Captcha("character", 4); //character type Captcha,length=4;
var cp:Captcha = new Captcha("bt", 0, false, 20); //bt type Captcha width no noise,and fontsize=20;
*/
package org.nwhy.utils{
import flash.display.DisplayObjectContainer;
import flash.display.Sprite;
import flash.events.MouseEvent;
import flash.events.Event;
import flash.text.TextField;
import flash.text.TextFormat;
import flash.text.TextFieldAutoSize;
public class Captcha extends Sprite {
private var __type:String;
private var __length:uint;
private var __size:uint;
private var __tft:TextFormat = new TextFormat();
private var __noiseFlag:Boolean;
private var __aryType:Array=["number","character","math","bt"];
private var __aryCharacters:Array=["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"];
private var __randCode:String="";
private const CHANGE:String="change";
private var sp_cont:Sprite=new Sprite();
private var sp_noise:Sprite=new Sprite();
public function Captcha(type:String="number",length:uint=5,noiseFlag:Boolean=true,size:uint=18):void {
__type = type;
__length = length;
__noiseFlag = noiseFlag;
__size = size;
__tft.font = "Arial";
__tft.size=__size;
__tft.bold = true;
sp_cont.x=__size/2;
addChild(sp_cont);
if (__aryType.indexOf(__type)==-1) {
__type=__aryType[3];
}
reRandCaptcha(null);
addEventListener(MouseEvent.MOUSE_DOWN,reRandCaptcha);
}
private function reRandCaptcha(_e:MouseEvent){
removeAllChild(sp_cont);
randCaptcha(__type);
drawNoise();
drawBorder();
dispatchEvent(new Event(CHANGE));
}
private function randCaptcha(type:String):void {
__randCode="";
switch (type) {
case __aryType[0] :
randCaptchaWithNumber();
break;
case __aryType[1] :
randCaptchaWithCharacter();
break;
case __aryType[2] :
randCaptchaWithMath();
break;
case __aryType[3] :
randCaptchaWithBt();
break;
default:
randCaptchaWithNumber();
}
}
private function randCaptchaWithNumber():void {
for (var i:uint=0; i<__length; i++) {
var tf:TextField=new TextField();
tf.text = String(randInt(0,9));
__randCode+=tf.text;
tf.selectable = false;
tf.x = int(__tft.size) * i;
tf.textColor = randInt(0,0x888888);
tf.autoSize = TextFieldAutoSize.LEFT;
tf.setTextFormat(__tft);
sp_cont.addChild(tf);
}
}
private function randCaptchaWithCharacter():void {
for (var i:uint=0; i<__length; i++) {
var tf:TextField=new TextField();
tf.text = __aryCharacters[randInt(0,51)];
__randCode+=tf.text;
tf.selectable = false;
tf.x = int(__tft.size) * i;
tf.textColor = randInt(0,0x888888);
tf.autoSize = TextFieldAutoSize.LEFT;
tf.setTextFormat(__tft);
sp_cont.addChild(tf);
}
__randCode = __randCode.toLowerCase();
}
private function randCaptchaWithMath():void {
var rand1:uint=randInt(0,5);
var rand2:uint=randInt(0,10);
var rand3:uint=randInt(0,5);
var rand4:uint=randInt(0,10);
var tf:TextField=new TextField();
tf.text = "(" + rand1 + "+" + rand2 + ")" + "*(" + rand3 + "+" + rand4 + ")";
tf.selectable = false;
tf.textColor = randInt(0,0x888888);
tf.autoSize = TextFieldAutoSize.LEFT;
tf.setTextFormat(__tft);
sp_cont.addChild(tf);
__randCode = String((rand1+rand2)*(rand3+rand4));
}
private function randCaptchaWithBt():void {
var rand1:Number = Number(randNumber(0,Math.PI).toFixed(2));
var rand2:Number = Number(randNumber(0,Math.PI).toFixed(2));
var tf:TextField = new TextField();
tf.text = "Math.pow(" + rand1 + ",Math.log(" + rand2 + "))";
tf.selectable = false;
tf.textColor = randInt(0,0x888888);
tf.autoSize = TextFieldAutoSize.LEFT;
tf.setTextFormat(__tft);
sp_cont.addChild(tf);
__randCode = Math.pow(rand1,Math.log(rand2)).toFixed(3);
}
private function drawNoise():void{
if(__noiseFlag){
sp_noise.graphics.clear();
for(var i=0;i<25;i++){
var ptx = randInt(1,width);
var pty = randInt(1,height);
var ex=ptx+randInt(-width,width);
var ey=pty+randInt(-height,height);
ex=(ex<=1)?1:((ex>=(width))?(width):ex);
ey=(ey< =1)?1:((ey>=height-1)?height-1:ey);
sp_noise.graphics.lineStyle(1,randInt(0,0xFFFFFF),0.25);
sp_noise.graphics.moveTo(ptx,pty);
sp_noise.graphics.lineTo(ex,ey);
}
sp_noise.width= sp_cont.width + __size;
sp_noise.height= sp_cont.height;
addChild(sp_noise);
}
return;
}
private function drawBorder():void{
graphics.clear();
graphics.lineStyle(1,0x006699);
graphics.drawRect(0,0,sp_cont.width+__size,height);
graphics.beginFill(0);
}
private function removeAllChild(container:DisplayObjectContainer){
while(container.numChildren>0){
container.removeChildAt(0);
}
}
private function randInt(min:int,max:int):int {
return Math.random() * (max - min) + min;
}
private function randNumber(min:Number,max:Number):Number {
return Math.random() * (max - min) + min;
}
public function get captcha():String{
return __randCode;
}
}
}
文档说明的已经很清楚了，这里就不再介绍咯。
November 20th, 2009 - 21:59
哈哈，想来想去，这个bt type设计的真是太有才了，我真是个天才～
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