转载自:http://www.iteye.com/topic/377994
- package com.humanmonth.home.component.page.signature
- {
- import flash.display.CapsStyle;
- import flash.display.JointStyle;
- import flash.display.LineScaleMode;
- import flash.events.MouseEvent;
- import mx.containers.Canvas;
- import mx.core.UIComponent;
- /**
- * 实现手写签名的白板
- * @author presses
- *
- */
- public class WriteArea extends Canvas
- {
- /**
- *笔
- */
- public var signature:UIComponent=new UIComponent();
- /**
- *颜色
- */
- public var myColor:uint=0x000000;
- /**
- *线条粗细
- */
- public var lineSize:int=1;
- /**
- *模式
- */
- public var pattern:String="圆珠笔";
- /**
- *当前的x座标
- */
- private var cX:Number;
- /**
- *当前的y座标
- */
- private var cY:Number;
- public function WriteArea()
- {
- this.addChild(signature);
- this.addEventListener(MouseEvent.MOUSE_DOWN,beginDraw);
- this.addEventListener(MouseEvent.MOUSE_UP,endDraw);
- }
- /**
- *鼠标压下时,开始画图,并添加移动鼠标画线的监听器
- */
- private function beginDraw(event:MouseEvent):void{
- this.signature.graphics.lineStyle(lineSize,myColor,1,true,LineScaleMode.NONE,CapsStyle.ROUND,JointStyle.ROUND,99);
- this.signature.graphics.beginFill(myColor);
- this.cX=event.localX;
- this.cY=event.localY;
- this.signature.graphics.moveTo(this.cX,this.cY);
- this.addEventListener(MouseEvent.MOUSE_MOVE,drawIng);
- }
- /**
- * 鼠标移动时,画线
- */
- private function drawIng(event:MouseEvent):void{
- if(this.pattern=="圆珠笔"){
- this.signature.graphics.moveTo(this.cX,this.cY);
- }
- this.signature.graphics.lineTo(event.localX,event.localY);
- this.cX=event.localX;
- this.cY=event.localY;
- }
- /**
- * 结束画图
- */
- private function endDraw(event:MouseEvent):void{
- this.removeEventListener(MouseEvent.MOUSE_MOVE,drawIng);
- }
- }
- }
效果图:http://rea.humanmonth.com/
package com.humanmonth.home.component.page.signature { import flash.display.CapsStyle; import flash.display.JointStyle; import flash.display.LineScaleMode; import flash.events.MouseEvent; import mx.containers.Canvas; import mx.core.UIComponent; /** * 实现手写签名的白板 * @author presses * */ public class WriteArea extends Canvas { /** *笔 */ public var signature:UIComponent=new UIComponent(); /** *颜色 */ public var myColor:uint=0x000000; /** *线条粗细 */ public var lineSize:int=1; /** *模式 */ public var pattern:String="圆珠笔"; /** *当前的x座标 */ private var cX:Number; /** *当前的y座标 */ private var cY:Number; public function WriteArea() { this.addChild(signature); this.addEventListener(MouseEvent.MOUSE_DOWN,beginDraw); this.addEventListener(MouseEvent.MOUSE_UP,endDraw); } /** *鼠标压下时,开始画图,并添加移动鼠标画线的监听器 */ private function beginDraw(event:MouseEvent):void{ this.signature.graphics.lineStyle(lineSize,myColor,1,true,LineScaleMode.NONE,CapsStyle.ROUND,JointStyle.ROUND,99); this.signature.graphics.beginFill(myColor); this.cX=event.localX; this.cY=event.localY; this.signature.graphics.moveTo(this.cX,this.cY); this.addEventListener(MouseEvent.MOUSE_MOVE,drawIng); } /** * 鼠标移动时,画线 */ private function drawIng(event:MouseEvent):void{ if(this.pattern=="圆珠笔"){ this.signature.graphics.moveTo(this.cX,this.cY); } this.signature.graphics.lineTo(event.localX,event.localY); this.cX=event.localX; this.cY=event.localY; } /** * 结束画图 */ private function endDraw(event:MouseEvent):void{ this.removeEventListener(MouseEvent.MOUSE_MOVE,drawIng); } } }
上传签名图片(上传到服务器或保存到本地):fp10(flash player)可以不经服务器,直接把图片保存到本地。但为了兼容fp9,这里的实现是先把图片上传到服务器,再调用下载功能。实现的思路是先把画图的组件转化为BitmapData,然后再编码成jpeg格式,并上传到服务器。最后调用客户端下载。这里要注意的一点是,fp10对下载的api作了限制,下载动作只能由用户触发。代码如下:
- package com.humanmonth.home.component.page.signature.remote
- {
- import com.humanmonth.global.Config;
- import flash.display.BitmapData;
- import flash.events.Event;
- import flash.net.FileReference;
- import flash.net.URLLoader;
- import flash.net.URLRequest;
- import flash.net.URLRequestMethod;
- import mx.controls.Alert;
- import mx.graphics.codec.JPEGEncoder;
- import mx.managers.CursorManager;
- /**
- * 图片的上传及下载
- * @author presses
- *
- */
- public class Connector
- {
- private var file:FileReference;
- private var myId:String;
- public function Connector()
- {
- }
- /**
- * 保存图片
- */
- public function savePic(myData:BitmapData,fun:Function):void{
- CursorManager.setBusyCursor();
- var url:String=Config.picLink+"rea/pic.do?action=savePic&timestamp="+new Date().getTime();
- var request:URLRequest = new URLRequest(url);
- request.method=URLRequestMethod.POST;
- request.contentType = "application/octet-stream";
- request.data=new JPEGEncoder(80).encode(myData);
- var loader:URLLoader = new URLLoader();
- loader.load(request) ;
- loader.addEventListener(Event.COMPLETE, fun) ;
- loader.addEventListener(Event.COMPLETE,initMyId);
- Alert.show("正在上传图片,等待数秒后,即可下载图片");
- }
- private function initMyId(event:Event):void{
- CursorManager.removeBusyCursor();
- var loader:URLLoader=URLLoader(event.target);
- this.myId=loader.data;
- Alert.show("上传图片成功,现在可以点击‘下载图片’按钮,保存图片到本地。");
- }
- /**
- * 下载图片
- */
- public function downloadFile(event:Event):void{
- var url2:String=Config.picLink+"rea/pic.do?action=queryPicById&pid="+myId+"&timestamp="+new Date().getTime();
- var req:URLRequest=new URLRequest(url2);
- file=new FileReference();
- file.download(req,"humanmonth.jpg");
- }
- }
- }
package com.humanmonth.home.component.page.signature.remote { import com.humanmonth.global.Config; import flash.display.BitmapData; import flash.events.Event; import flash.net.FileReference; import flash.net.URLLoader; import flash.net.URLRequest; import flash.net.URLRequestMethod; import mx.controls.Alert; import mx.graphics.codec.JPEGEncoder; import mx.managers.CursorManager; /** * 图片的上传及下载 * @author presses * */ public class Connector { private var file:FileReference; private var myId:String; public function Connector() { } /** * 保存图片 */ public function savePic(myData:BitmapData,fun:Function):void{ CursorManager.setBusyCursor(); var url:String=Config.picLink+"rea/pic.do?action=savePic&timestamp="+new Date().getTime(); var request:URLRequest = new URLRequest(url); request.method=URLRequestMethod.POST; request.contentType = "application/octet-stream"; request.data=new JPEGEncoder(80).encode(myData); var loader:URLLoader = new URLLoader(); loader.load(request) ; loader.addEventListener(Event.COMPLETE, fun) ; loader.addEventListener(Event.COMPLETE,initMyId); Alert.show("正在上传图片,等待数秒后,即可下载图片"); } private function initMyId(event:Event):void{ CursorManager.removeBusyCursor(); var loader:URLLoader=URLLoader(event.target); this.myId=loader.data; Alert.show("上传图片成功,现在可以点击‘下载图片’按钮,保存图片到本地。"); } /** * 下载图片 */ public function downloadFile(event:Event):void{ var url2:String=Config.picLink+"rea/pic.do?action=queryPicById&pid="+myId+"&timestamp="+new Date().getTime(); var req:URLRequest=new URLRequest(url2); file=new FileReference(); file.download(req,"humanmonth.jpg"); } } }
- package com.humanmonth.home.component.page.signature
- {
- import com.humanmonth.home.component.page.signature.remote.Connector;
- import flash.display.BitmapData;
- import flash.events.Event;
- import flash.events.MouseEvent;
- import mx.core.Application;
- import mx.events.ColorPickerEvent;
- import mx.events.FlexEvent;
- import mx.events.ListEvent;
- import mx.events.NumericStepperEvent;
- /**
- * 控制面版
- * @author presses
- *
- */
- public class MyControlBarAs extends MyControlBar
- {
- public var writearea:WriteArea;
- private var connector:Connector=new Connector();
- public function MyControlBarAs()
- {
- super();
- this.addEventListener(FlexEvent.CREATION_COMPLETE,myInit);
- }
- private function myInit(event:Event):void{
- this.writearea=Application.application.signature.writearea;
- this.reset.addEventListener(MouseEvent.CLICK,cleanArea);
- this.size.addEventListener(NumericStepperEvent.CHANGE,setLineSize);
- this.color.addEventListener(ColorPickerEvent.CHANGE,setColor);
- this.pattern.addEventListener(ListEvent.CHANGE,setPattern);
- this.savePic.addEventListener(MouseEvent.CLICK,savePicture);
- this.downloadPic.addEventListener(MouseEvent.CLICK,connector.downloadFile)
- }
- /**
- * 保存图片
- */
- private function savePicture(event:Event):void{
- var myData:BitmapData=new BitmapData(this.writearea.width,this.writearea.height);
- myData.draw(this.writearea);
- connector.savePic(myData,enableDownload);
- }
- private function enableDownload(event:Event):void{
- this.downloadPic.enabled=true;
- }
- /**
- * 设置模式
- */
- private function setPattern(event:Event):void{
- this.writearea.pattern=String(this.pattern.value);
- }
- /**
- * 清空写字区
- */
- private function cleanArea(event:Event):void{
- this.writearea.signature.graphics.clear();
- }
- /**
- * 设置线条粗细
- */
- public function setLineSize(event:Event):void{
- this.writearea.lineSize=this.size.value;
- }
- /**
- * 设置颜色
- */
- public function setColor(event:Event):void{
- this.writearea.myColor=uint(this.color.value);
- }
- }
- }