模仿了CSDN的饼图源代码
看了http://dev.csdn.net/里右侧的投票饼图,觉得挺有趣的,
所以就自己也模仿了一个..演示页面:http://www.conanlwl.net/bbspic/TestVote.aspx
具体步骤如下..(C#)
本例子中利用XML文件来保存投票数据.XML文件格式如下,文件名称为Vote.XML
<?xml version="1.0" encoding="utf-8"?><Vote> <VoteInfo> <ID>1</ID> <VoteTitle>以下三国人物你喜欢谁?</VoteTitle> <Item> <VoteID>1</VoteID> <Title>曹操</Title> <Count>2</Count> </Item> <Item> <VoteID>2</VoteID> <Title>刘备</Title> <Count>2</Count> </Item> <Item> <VoteID>3</VoteID> <Title>孙权</Title> <Count>2</Count> </Item> <Item> <VoteID>4</VoteID> <Title>司马懿</Title> <Count>2</Count> </Item> <Item> <VoteID>5</VoteID> <Title>诸葛亮</Title> <Count>1</Count> </Item> <Item> <VoteID>6</VoteID> <Title>陆逊</Title> <Count>1</Count> </Item> <Item> <VoteID>7</VoteID> <Title>吕布</Title> <Count>1</Count> </Item> <Item> <VoteID>8</VoteID> <Title>姜维</Title> <Count>1</Count> </Item> <Item> <VoteID>9</VoteID> <Title>其它</Title> <Count>2</Count> </Item> </VoteInfo></Vote>第一步,就是投票页面了,我们就通过这个页面来进行对选项的投票.新建一个WebForm,并命名为TestVote.aspx
<HTML> <HEAD> <title>模仿CSDN的投票结果</title> <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1"> <meta name="CODE_LANGUAGE" Content="C#"> <meta name="vs_defaultClientScript" content="JavaScript"> <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5"> </HEAD> <body> <form id="Form1" method="post" runat="server"> <fieldset style="WIDTH:20%;float:left"> <legend accesskey="F" style="FONT-WEIGHT:bold;COLOR:#000000;font-size:12px" align=center> <%=VoteTitle%></legend> <ul style="list-style-type:none;margin-left:50px">
<%for(int i=0;i<xnl.Count;i++)
{
System.Xml.XmlNode xn = xnl.Item(i);%> <li> <input type=checkbox name="vote" value="<%=xn.SelectSingleNode("VoteID").InnerText%>" /><%=xn.SelectSingleNode("Title").InnerText%> <%}%> </li> </ul> <div align=center><asp:Button id="Button1" runat="server" Text="投票"></asp:Button> <input type=button value="查看结果" onclick="javascript:var url='ShowVote.aspx?i=0&voteid=<%=Request.QueryString["VoteID"]%>';window.open(url,'_blank','left=10,top=20,width=675,height=360');return false;" /></div> </fieldset> </form> </body></HTML>以下是testvote.aspx.cs的代码
using System;using System.Collections;using System.ComponentModel;using System.Data;using System.Drawing;using System.Web;using System.Web.SessionState;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.HtmlControls;using System.Xml;namespace BbsPic{
/// <summary> /// TestVote 的摘要说明。
/// </summary> public class TestVote : System.Web.UI.Page { protected XmlNodeList xnl; protected string VoteTitle = ""; protected System.Web.UI.WebControls.Button Button1; private XmlDocument myDoc = new XmlDocument(); private void Page_Load(object sender, System.EventArgs e) { // 在此处放置用户代码以初始化页面 if(!IsPostBack) BindXML("1"); }
Web 窗体设计器生成的代码 private void BindXML(string VoteID) { myDoc.Load(Server.MapPath("Vote.xml")); XmlNode xn = myDoc.SelectSingleNode("//VoteInfo[ID='" + VoteID + "']"); VoteTitle = xn.SelectSingleNode("VoteTitle").InnerText; xnl = xn.SelectNodes("Item"); } private void Button1_Click(object sender, System.EventArgs e) { //string VoteID = Request.QueryString["VoteID"]; string VoteID = "1"; if(Request.Cookies["IsVote"]!=null) { Response.Write("<script>alert('对不起,你已投过票!');document.location=document.location;</script>"); } else { if(Request.Form["Vote"] != null && Request.Form["Vote"] != "") { string[] votes = Request.Form["Vote"].Split(','); myDoc.Load(Server.MapPath("Vote.xml")); XmlNode xn = myDoc.SelectSingleNode("//VoteInfo[ID='" + VoteID + "']"); for(int i=0;i<votes.Length;i++) { XmlNode xn0 = xn.SelectSingleNode("Item[VoteID='" + votes[i] + "']"); xn0.SelectSingleNode("Count").InnerText = Convert.ToString(Convert.ToInt32(xn0.SelectSingleNode("Count").InnerText) + 1); } myDoc.Save(Server.MapPath("Vote.xml")); } Response.Cookies["IsVote"].Value = "true"; Response.Cookies["IsVote"].Expires.AddHours(1); Response.Write("<script>window.open('ShowVote.aspx?i=0&voteid=" + VoteID + "','_blank','left=10,top=20,width=675,height=360');document.location='TestVote.aspx?voteid=" + VoteID + "';</script>"); } Response.End(); } }}第二步,就是我们的饼图图片页面,最后以二进制流的方式显示出来..本饼图有两种状态,一是没被点中时的全圆饼图,第二就是当某个选项被点中时分离出来的饼图.新建一WebForm窗体,命名为Vote.aspx
在Vote.aspx里把除了<%page ....%>以外的HTML代码全部删掉.
接着是Vote.aspx.cs的代码
using System;using System.Collections;using System.ComponentModel;using System.Data;using System.Drawing;using System.Web;using System.Web.SessionState;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.HtmlControls;using System.Xml;namespace BbsPic{ /// <summary> /// Vote 的摘要说明。 /// </summary> public class Vote : System.Web.UI.Page { private void Page_Load(object sender, System.EventArgs e) { DrawPic(Convert.ToInt32(Request.QueryString["i"]==""?"0":Request.QueryString["i"]),1); } Web 窗体设计器生成的代码 private void DrawPic(int iSelect,int VoteID) { XmlDocument myDoc = new XmlDocument(); myDoc.Load(Server.MapPath("Vote.xml")); XmlNode xn = myDoc.SelectSingleNode("//VoteInfo[ID='" + VoteID + "']"); XmlNodeList xnl = xn.SelectNodes("Item"); float[] angle = new float[xnl.Count]; string[] sTxt = new string[xnl.Count]; float AllCount = 0; for(int i=0;i<xnl.Count;i++) { AllCount += Convert.ToSingle(xnl.Item(i).SelectSingleNode("Count").InnerText); } for(int i=0;i<xnl.Count;i++) { XmlNode xn0 = xnl.Item(i); angle[i] = Convert.ToSingle(xn0.SelectSingleNode("Count").InnerText) * 360.0f / AllCount; sTxt[i] = xn0.SelectSingleNode("Title").InnerText; }//// float[] angle = new float[]{32,58,40,40,28,27,33,72,30};// string[] sTxt = new string[]{"一","二","三三三三三","四四四四四四","五五","六六","七七七","八八八八","九九九九"}; float x=120.0f,y=80.0f,d=200.0f,offset=15.0f,x1=0.0f,y1=0.0f;//圆形x,y坐标，半径，偏移距离，x,y方向的偏移值 float curangle=0.0f;//当前已转的角度 int ox=0,oy=0;//圆心坐标 int px1=0,py1=0,px2=0,py2=0;//直线的端点 System.Drawing.Image bitmap = new Bitmap(675,360,System.Drawing.Imaging.PixelFormat.Format32bppPArgb); Graphics g = Graphics.FromImage(bitmap); g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; g.SmoothingMode= System.Drawing.Drawing2D.SmoothingMode.HighQuality; //20项颜色。 Color[] color=new Color[]{Color.Black,Color.Blue,Color.Coral,Color.DarkGoldenrod,Color.Firebrick,Color.Gold,Color.Honeydew,Color.Indigo,Color.Khaki,Color.LemonChiffon,Color.Maroon,Color.Navy, Color.Orange,Color.PapayaWhip,Color.Red,Color.Salmon,Color.Thistle,Color.Violet,Color.Wheat,Color.YellowGreen}; g.Clear(Color.FromArgb(255,228,181));//清屏 StringFormat sf = new StringFormat(); sf.Alignment = StringAlignment.Center; g.DrawString(xn.SelectSingleNode("VoteTitle").InnerText,new Font(FontFamily.GenericSansSerif,12),new SolidBrush(Color.Black),new RectangleF(0.0f,10.0f,675.0f,20.0f),sf); g.DrawString("Power By Http://www.conanlwl.net/",new Font(FontFamily.GenericSansSerif,12),new SolidBrush(Color.Black),new RectangleF(300.0f,300.0f,375.0f,20.0f),sf); //画右侧的大矩形 g.FillRectangle(new SolidBrush(Color.FromArgb(128,128,128)),482,122,80,(angle.Length+1) * 12);//阴影 g.FillRectangle(new SolidBrush(Color.FromArgb(253,245,230)),480,120,80,(angle.Length+1) * 12);//前景 g.DrawRectangle(new Pen(Color.FromArgb(128,128,128),1),480,120,80,(angle.Length+1) * 12);//轮廓 ///////////////////////////////////////////// for(int i=0;i< angle.Length;i++) { sf.Alignment = StringAlignment.Near; if(i == iSelect-1) { x1 = Convert.ToSingle(offset * Math.Cos((curangle + angle[i]/2)*Math.PI/180.0f)); y1 = Convert.ToSingle(offset * Math.Sin((curangle + angle[i]/2)*Math.PI/180.0f)); ox = Convert.ToInt32(x + d/2 + x1); oy = Convert.ToInt32(y + d/2 + y1); px1 = Convert.ToInt32((d/2 + 20) * Math.Cos((curangle + angle[i]/2)*Math.PI/180.0f)) + ox; py2 = py1 = Convert.ToInt32((d/2 + 20) * Math.Sin((curangle + angle[i]/2)*Math.PI/180.0f)) + oy; if((curangle + angle[i]/2)>=270 || (curangle + angle[i]/2)<90) px2=px1 + 20; else px2=px1 - 20; g.DrawLine(new Pen(Color.FromArgb(120,120,120),1),new Point(ox,oy),new Point(px1,py1));//画直线-标释用。 g.DrawLine(new Pen(Color.FromArgb(120,120,120),1),new Point(px1,py1),new Point(px2,py2));//直线 if((curangle + angle[i]/2)>=270 || (curangle + angle[i]/2)<90) //写文字 { g.DrawString(sTxt[i],new Font(FontFamily.GenericSansSerif,8),new SolidBrush(Color.FromArgb(120,120,120)),px2 ,py2 - 4,sf); } else { g.DrawString(sTxt[i],new Font(FontFamily.GenericSansSerif,8),new SolidBrush(Color.FromArgb(120,120,120)),px2 - sTxt[i].Length * 12-2 ,py2 - 4,sf); } g.FillPie(new SolidBrush(Color.FromArgb(128,128,128)),x + x1 + 2,y + y1 + 2,d,d,curangle,angle[i]);//画饼图的阴影 g.FillPie(new SolidBrush(color[i]),x + x1,y + y1,d,d,curangle,angle[i]); //画饼图 g.DrawPie(new Pen(Color.FromArgb(128,128,128),1),x + x1,y + y1,d,d,curangle,angle[i]); //画轮廓 } else { ox = Convert.ToInt32(x + d/2); oy = Convert.ToInt32(y + d/2); px1 = Convert.ToInt32((d/2 + 20) * Math.Cos((curangle + angle[i]/2)*Math.PI/180.0f)) + ox; py2 = py1 = Convert.ToInt32((d/2 + 20) * Math.Sin((curangle + angle[i]/2)*Math.PI/180.0f)) + oy; if((curangle + angle[i]/2)>=270 || (curangle + angle[i]/2)<90) px2=px1 + 20; else px2=px1 - 20; g.DrawLine(new Pen(Color.FromArgb(120,120,120),1),new Point(ox,oy),new Point(px1,py1)); g.DrawLine(new Pen(Color.FromArgb(120,120,120),1),new Point(px1,py1),new Point(px2,py2)); if((curangle + angle[i]/2)>=270 || (curangle + angle[i]/2)<90) { g.DrawString(sTxt[i],new Font(FontFamily.GenericSansSerif,8),new SolidBrush(Color.FromArgb(120,120,120)),px2 ,py2 - 4,sf); } else { g.DrawString(sTxt[i] ,new Font(FontFamily.GenericSansSerif,8),new SolidBrush(Color.FromArgb(120,120,120)),px2 - sTxt[i].Length * 12-2 ,py2 - 4,sf); } g.FillPie(new SolidBrush(Color.FromArgb(128,128,128)),x+2,y+2,d,d,curangle,angle[i]); g.FillPie(new SolidBrush(color[i]),x,y,d,d,curangle,angle[i]); g.DrawPie(new Pen(Color.FromArgb(128,128,128),1),x,y,d,d,curangle,angle[i]); } curangle += angle[i]; //画右侧的小矩形,与文字 g.FillRectangle(new SolidBrush(Color.FromArgb(128,128,128)),492,i*12 + 6 + 120 + 2,20,8);//阴影 g.FillRectangle(new SolidBrush(color[i]),490,i*12 + 6 + 120,20,8);//前景 g.DrawRectangle(new Pen(Color.FromArgb(120,120,120),1),490,i*12+6+120,20,8);//轮廓 g.DrawString(sTxt[i],new Font(FontFamily.GenericSansSerif,7),new SolidBrush(Color.FromArgb(80,80,80)),515,i*12 + 6+ 120,sf); } System.IO.MemoryStream ms = new System.IO.MemoryStream(); bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Png); Response.ClearContent(); Response.ContentType = "image/Png"; Response.BinaryWrite(ms.ToArray()); } }}第三步,因为要使图片里的饼图的某个选项能够点击,就必须要由另外一个页面来装载这个图片,并在图片上描绘热点.所以就必须新建一个窗体,这个窗体也是"显示投票结果"的显示页面.
新建一个WebForm窗体,并命名为ShowVote.aspx
以下是ShowVote.aspx的HTML代码:
<HTML> <HEAD> <title>查看投票结果</title> <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1"> <meta name="CODE_LANGUAGE" Content="C#"> <meta name="vs_defaultClientScript" content="JavaScript"> <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5"> </HEAD> <body topmargin=0 leftmargin=0> <img src="Vote.Aspx?i=<%=Request.QueryString["i"]%>&voteid=<%=Request.QueryString["voteid"]%>" USEMAP="#Map" border=0> <MAP NAME="Map"> <%=Map%> </map> </body></HTML>以下是ShowVote.aspx.cs的代码:
using System;using System.Collections;using System.ComponentModel;using System.Data;using System.Drawing;using System.Web;using System.Web.SessionState;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.HtmlControls;using System.Xml;namespace BbsPic{ /// <summary> /// ShowVote 的摘要说明。 /// </summary> public class ShowVote : System.Web.UI.Page { protected string Map = ""; private void Page_Load(object sender, System.EventArgs e) { if(Request.QueryString["i"]!="" && Request.QueryString["i"] != null) Map = DrawMap(Convert.ToInt32(Request.QueryString["i"]),1); } Web 窗体设计器生成的代码 private string DrawMap(int iSelect,int VoteID) { string str = ""; //float[] angle = new float[]{32,58,40,40,28,27,33,72,30}; //string[] sTxt = new string[]{"一","二","三三三三三","四四四四四四","五五","六六","七七七","八八八八","九九九九"}; XmlDocument myDoc = new XmlDocument(); myDoc.Load(Server.MapPath("Vote.xml")); XmlNode xn = myDoc.SelectSingleNode("//VoteInfo[ID='" + VoteID + "']"); XmlNodeList xnl = xn.SelectNodes("Item"); float[] angle = new float[xnl.Count]; string[] sTxt = new string[xnl.Count]; float AllCount = 0; for(int i=0;i<xnl.Count;i++) { AllCount += Convert.ToSingle(xnl.Item(i).SelectSingleNode("Count").InnerText); } for(int i=0;i<xnl.Count;i++) { XmlNode xn0 = xnl.Item(i); angle[i] = Convert.ToSingle(xn0.SelectSingleNode("Count").InnerText) * 360.0f / AllCount; sTxt[i] = xn0.SelectSingleNode("Title").InnerText; } float x=120.0f,y=80.0f,d=200.0f,offset=15.0f,x1=0.0f,y1=0.0f;//圆形x,y坐标，半径，偏移距离，x,y方向的偏移值 float curangle=0.0f;//当前已转的角度 int oAngle = 4;//描点偏移的度数，越小，圆弧就越圆滑。 int ox=0,oy=0;//圆心坐标 for(int i=0;i< angle.Length;i++) { if(i == iSelect-1) { x1 = Convert.ToSingle(offset * Math.Cos((curangle + angle[i]/2)*Math.PI/180.0f)); y1 = Convert.ToSingle(offset * Math.Sin((curangle + angle[i]/2)*Math.PI/180.0f)); ox = Convert.ToInt32(x + d/2 + x1); oy = Convert.ToInt32(y + d/2 + y1); } else { ox=Convert.ToInt32(x + d/2); oy=Convert.ToInt32(y + d/2); } str += "<AREA SHAPE="poly" HREF="?i=" + (i+1) + "&VoteID=" + VoteID + "" TITLE="" + sTxt[i] + ";票数：" + xnl.Item(i).SelectSingleNode("Count").InnerText + "" COORDS=""; str += ox + "," + oy; //圆心 str += "," + (Convert.ToInt32(d/2 * Math.Cos(curangle * Math.PI/180.0f)) + ox) + "," + (Convert.ToInt32(d/2 * Math.Sin(curangle * Math.PI/180.0f)) + oy);//圆弧的第一个端点的坐标 float MaxAngle = curangle + angle[i]; while(true) { curangle += oAngle; if(curangle >= MaxAngle)//圆弧上的另一个端点,也即最后一个点 { curangle = MaxAngle; str += "," + (Convert.ToInt32(d/2 * Math.Cos(curangle * Math.PI/180.0f)) + ox) + "," + (Convert.ToInt32(d/2 * Math.Sin(curangle * Math.PI/180.0f)) + oy); break; } else //圆弧上的点 { str += "," + (Convert.ToInt32(d/2 * Math.Cos(curangle * Math.PI/180.0f)) + ox) + "," + (Convert.ToInt32(d/2 * Math.Sin(curangle * Math.PI/180.0f)) + oy); } } str += ""> "; //490,i*12 + 6 + 120,20,8 } for(int i=0;i< angle.Length;i++)//描右侧小方形的点 { str += "<AREA SHAPE="rect" HREF="?i=" + (i+1) + "&voteid=" + VoteID + "" TITLE="" + Convert.ToSingle(Convert.ToSingle(xnl.Item(i).SelectSingleNode("Count").InnerText)*100.0f/AllCount).ToString("F") + "%" COORDS=""; str += "490," + (i*12+6+120) + "," + (490+20) + "," + (i*12+6+120+8); str += ""> "; } return str; } }}
