我们工作中经常需要将数据转化成柱状图，饼图等，以方便直观的分析数据， 这里给大家介绍一个ASP中制作饼图、柱状图的组件：csDrawGraph，csdgt.zip,因为是组件，所以我们在使用之前需要用REGSVR32.EXE 注册一下，csDrawGraph，可以在ASP中创建饼图，柱状图以及线图，其支持的格式有GIF,PNG,JPG and BMP.
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
%>
程序很简单，再些不详细说明，下面看一个将数据库中的数据转换到图表的例子：
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 %>
<%
'利用数据库中的数据生成线图。
'根据4个不同的值分别生成4条线。
'在X轴上显示星期的名称。
Response.Expires = 0
Response.Buffer = true
Response.Clear
'利用下面的语句创建chart对象，版本不同会有所差异。
'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
'关闭数据库连接
RS.Close
DBConn.Close
'下面设置组件属性
'X轴坐标从1开始而不是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
'最后图片以GIF格式发送到浏览器
Response.ContentType = "image/gif"
Response.BinaryWrite Chart.GIFLine
Response.End
%>
演示效果：
代码下载：
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