用ASP製做餅圖、柱狀圖等

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上載者:User
餅圖|柱狀圖

  我們工作中經常需要將資料轉化成柱狀圖,餅圖等,以方便直觀的分析資料, 這裡給大家介紹一個ASP中製作餅圖、柱狀圖的組件:csDrawGraph,csdgt.zip,因為是組件,所以我們在使用之前需要用REGSVR32.EXE 註冊一下,csDrawGraph,可以在ASP中建立餅圖,柱狀圖以及線圖,其支援的格式有GIF, PNG, JPG and BMP.

  看看如下的柱狀圖,餅圖如何產生的例子:


chartdemo.asp

 <%@ language=vbscript %>
<html>
<head>
<title>csDrawGraph Demonstration</title>
</head>
<body bgcolor="#FFFFFF">
<P>This simple demonstration shows two graphs using the same data. The first is
  a bar chart:</P>
<P align="center"><IMG src="chartimages.asp?Type=Bar" width="400" height="300">
</P>
<P align="left">The second is a pie chart. The background colour is set to light
  grey to show the overall size of the image.</P>
<P align="center"><IMG src="chartimages.asp?Type=Pie" width="400" height="300">
</P>
</body>
</html>

chartimages.asp

 

<%@ language=vbscript %>

<%
  Response.Expires = 0
  Response.Buffer = true
  Response.Clear 
  Response.ContentType = "Image/Gif"

  Set Chart = Server.CreateObject("csDrawGraphTrial.Draw")


  Chart.AddData "NO> 1", 17, "ff0000"
  Chart.AddData "NO> 2", 28, "00ff00"
  Chart.AddData "NO> 3", 5, "0000ff"

  If Request.QueryString("Type") = "Pie" Then
    Chart.Title = "Sample Pie Chart"
    Chart.BGColor = "eeeeee"
    Chart.LabelBGColor = "eeeeee"
    Chart.TitleBGColor = "eeeeee"
    Response.BinaryWrite Chart.GifPie
  Else
    Chart.Title = "Sample Bar Chart"
    Response.BinaryWrite Chart.GifBar
  End If

  Response.End
%>


程式很簡單,再些不詳細說明,下面看一個將資料庫中的資料轉換到圖表的例子:

lines.asp:

 <html>
<head>
<title>Line graph showing all the results</title>

</head>

<body>
<table align=center width=400>
  <tr><td colspan=4><img src="gif_lines.asp"  width=400 height=300></td></tr>
</table>
<p>Links to the other result pages:</p>
<p><a href=barsbyday.asp>Bar chart showing all results for any one day</a>.</p>
<p><a href=barsbycolour.asp>Bar charts showing results for each colour separately</a>.</p>
</body>
</html>

gif_lines.asp:

 <%@ language=vbscript %>
<%
  '利用資料庫中的資料產生線圖。
  '根據4個不同的值分別產生4條線。
  '在X軸上顯示星期的名稱。

  Response.Expires = 0
  Response.Buffer = true
  Response.Clear

  '利用下面的語句建立chart對象,版本不同會有所差異。
  'Set Chart = Server.CreateObject("csDrawGraph.Draw")
  Set Chart = Server.CreateObject("csDrawGraphTrial.Draw")

  ConnectionString = "PROVIDER=MICROSOFT.JET.OLEDB.4.0;DATA SOURCE=" & _
    Server.Mappath("data.mdb")
  Set DBConn = Server.CreateObject("ADODB.Connection")
  DBConn.Open ConnectionString
  Set RS = Server.CreateObject("ADODB.Recordset")
  SQL = "SELECT * FROM Table1 ORDER BY Day"
  RS.Open SQL, DBConn

    While Not RS.Eof
      Chart.AddPoint CInt(RS("Day")), CInt(RS("Red")), "ff0000", "Red"
      Chart.AddPoint CInt(RS("Day")), CInt(RS("Blue")), "0000ff", "Blue"
      Chart.AddPoint CInt(RS("Day")), CInt(RS("Green")), "00ff00", "Green"
      Chart.AddPoint CInt(RS("Day")), CInt(RS("Yellow")), "ffff00", "Yellow"
      Chart.AddXValue CInt(RS("Day")), RS("DayName")
      RS.MoveNext
    Wend

  '關閉資料庫連接
  RS.Close
  DBConn.Close

  '下面設定組件屬性
  'X軸座標從1開始而不是0。(XOffset = 1)

  Chart.Title = "All the combined results"
  Chart.TitleX = 100
  Chart.YAxisText = "Total for each day"
  Chart.OriginY = 220
  Chart.XOffset = 1
  Chart.XTop = 7
  Chart.XGrad = 1
  Chart.UseXAxisLabels = true
  Chart.LineWidth = 2
  Chart.PointSize = 3
  Chart.PointStyle = 1

  '最後圖片以GIF格式發送到瀏覽器
  Response.ContentType = "image/gif"
  Response.BinaryWrite Chart.GIFLine
  Response.End
%>

結果如圖所示:

csDrawGraph的下載地址:http://www.chestysoft.com/download/csdgt.zip



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