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锁定老帖子 主题:flex实现手写在线签名
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作者 | 正文 |
发表时间:2009-05-02
最后修改:2010-01-06
在线手写签名分两部份。第一部分是画图功能的实现,第二部份是上传图片的功能(上传到服务器或保存到本地)。 画图:画图比较简单,只要用到了graphics对像的几个方法。当鼠标按下时,调用graphics的beginFill和moveTo方法。同时,还要把调用了lineTo的方法加入到鼠标的MOUSE_MOVE事件中。代码如下: 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 { 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); } } } 到这里为止,功能已经实现了。但效果不太好。主要是签名时,笔画不圆滑,在flex的api中,好像找不到在flash中设置圆滑的功能。 效果图:http://piterlin.appspot.com/ 声明:ITeye文章版权属于作者,受法律保护。没有作者书面许可不得转载。
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发表时间:2009-05-03
谢谢分享 原来10还能下载的
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发表时间:2009-06-12
我也想运行以下楼主的成果,能不能把java包给一给呢~~
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发表时间:2009-06-14
java端主要有两个方法。一个是接收客户端保存图片时的流,另一个是根据客户端的ID返回流。当前例子是运行在google app engine上的。以下是核心代码:
servlet: /** * */ package com.humanmonth.rea.pic; import java.io.IOException; import java.util.logging.Logger; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.io.IOUtils; import com.google.appengine.api.datastore.Blob; import com.humanmonth.framework.web.servlet.Action; import com.humanmonth.framework.web.servlet.AutoMapperServlet; import com.humanmonth.framework.web.servlet.ServletUtil; /** * @author presses * */ @SuppressWarnings("serial") public class PictureServlet extends AutoMapperServlet { private Logger log=Logger.getLogger(this.getClass().getName()); /** * 测试 */ @Action("sayHi") public void sayHi(HttpServletRequest req, HttpServletResponse res) throws IOException { ServletUtil.outTips(res, "hi", null); } /** * 保存图片 */ @Action("savePic") public void savePic(HttpServletRequest req, HttpServletResponse res) throws IOException { String name= ServletUtil .getStringParameterWithTrim(req, "name"); if(name==null){ name="签名.jpg"; } Picture pic = new Picture(ServletUtil.getStringParameterWithTrim(req, "module"),name, new Blob(IOUtils.toByteArray(req.getInputStream()))); new PictureService().savePic(pic); log.info("保存的文件大小:"+pic.getContent().getBytes().length); ServletUtil.outView(res, pic.getId()); } /** * 查找所有图片 */ @Action("queryAllPic") public void queryAllPic(HttpServletRequest req, HttpServletResponse res) throws IOException { String result = ""; for (Picture pic : new PictureService().queryAllPicture()) { if (pic.getContent() == null) { continue; } result += new String(pic.getContent().getBytes(), "utf-8") + ":"; } ServletUtil.outView(res, result); } /** * 以ID获取图片 */ @Action("queryPicById") public void queryPicById(HttpServletRequest req, HttpServletResponse res) throws IOException { String id = ServletUtil.getStringParameterWithTrim(req, "pid"); log.info("开始下载文件,ID为:"+id); Picture pic = new PictureService().queryPicById(Long.valueOf(id)); log.info("下载的文件大小:"+pic.getContent().getBytes().length); ServletUtil.downloadToClient(res, pic.getContent().getBytes(), pic.getName()); } } 业务类: /** * */ package com.humanmonth.rea.pic; import java.util.List; import java.util.logging.Logger; import javax.jdo.PersistenceManager; import com.humanmonth.framework.dao.JDOTemplate; /** * @author presses * */ public class PictureService { @SuppressWarnings("unused") private final Logger log=Logger.getLogger(this.getClass().getName()); /** * 保存图片 */ public void savePic(final Picture pic) { new JDOTemplate<Picture>() { @Override public void deal(PersistenceManager pm, List<Picture> result) { pm.makePersistent(pic); pm.flush(); } }.execute(); } /** * 以ID和条件获取图片 */ public Picture queryPicById(final Long id) { return new JDOTemplate<Picture>() { @Override public void deal(PersistenceManager pm, List<Picture> result) { result.add((Picture) pm.getObjectById(Picture.class,id)); } }.execute().get(0); } /** * 查找所有的图片 */ public List<Picture> queryAllPicture() { return new JDOTemplate<Picture>() { @SuppressWarnings("unchecked") @Override public void deal(PersistenceManager pm, List<Picture> result) { Object obj = pm.newQuery("select from " + Picture.class.getName()).execute(); result.addAll((List<Picture>) obj); } }.execute(); } } 域对像: package com.humanmonth.rea.pic; import java.sql.Date; import javax.jdo.annotations.IdGeneratorStrategy; import javax.jdo.annotations.IdentityType; import javax.jdo.annotations.PersistenceCapable; import javax.jdo.annotations.Persistent; import javax.jdo.annotations.PrimaryKey; import com.google.appengine.api.datastore.Blob; /** * 图片 * * @author presses * */ @PersistenceCapable(identityType = IdentityType.APPLICATION) public class Picture { /** * 主键 */ @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) private Long id; /** * 模块 */ @Persistent private String module; /** * 文件名 */ @Persistent private String name; /** * 内容 */ @Persistent private Blob content; /** * 保存时间 */ @Persistent private Date date; public Picture(String module, String name,Blob content) { this.module = module; this.name=name; this.content = content; } public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getModule() { return module; } public void setModule(String module) { this.module = module; } public Date getDate() { return date; } public void setDate(Date date) { this.date = date; } public Blob getContent() { return content; } public void setContent(Blob content) { this.content = content; } public String getName() { return name; } public void setName(String name) { this.name = name; } } |
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发表时间:2009-08-25
lz
那个 MyControlBar的代码,也分享下吧 干脆整个工程给个,我刚懂点as,flex都搞不定呵 麻烦一下 |
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发表时间:2009-08-26
<?xml version="1.0" encoding="utf-8"?> <mx:Panel xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" width="100%" height="200" title="控制栏"> <mx:Label x="10" y="11" text="模式" width="56" textAlign="right"/> <mx:ComboBox x="85" y="6" fontSize="12" fontWeight="normal" id="pattern"> <mx:dataProvider> <mx:Array> <mx:String>圆珠笔</mx:String> <mx:String>毛笔</mx:String> </mx:Array> </mx:dataProvider> </mx:ComboBox> <mx:HRule x="13" y="37" width="192" height="4"/> <mx:Label x="0" y="48" text="笔画粗细" width="66" textAlign="right"/> <mx:NumericStepper x="85" y="46" minimum="1" maximum="5" stepSize="1" id="size"/> <mx:HRule x="13" y="74" width="192" height="8"/> <mx:Label x="10" y="89" text="颜色" width="56" textAlign="right"/> <mx:ColorPicker x="85" y="89" id="color"/> <mx:HRule x="13" y="115" width="192" height="6"/> <mx:Button x="10" y="129" label="清空" id="reset"/> <mx:Button x="58" y="129" label="上传图片" id="savePic"/> <mx:Button x="124" y="129" label="下载图片" id="downloadPic" enabled="false"/> </mx:Panel> 全部类都帖上来了,以后有时间再打包上传。 |
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发表时间:2009-09-24
毛笔的 毛字好像不能写呢
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发表时间:2009-09-25
我上面就说了,效果不怎么样。呵呵。 |
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发表时间:2009-11-04
期待LZ打包
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发表时间:2009-12-09
楼主,你这个有人在你的基础上改进了
http://bbs.airia.cn/FLEX/thread-8769-1-1.aspx |
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