用ASP制作统计饼图、柱状图等

网络整理 - 09-05

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">
This simple demonstration shows two graphs using the same data. The first is
a bar chart:
<IMG src="chartimages.asp?Type=Bar" width="400" height="300">

The second is a pie chart. The background colour is set to light
grey to show the overall size of the image.
<IMG src="chartimages.asp?Type=Pie" width="400" height="300">

</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>
Links to the other result pages:
<a href=barsbyday.asp>Bar chart showing all results for any one day</a>.
<a href=barsbycolour.asp>Bar charts showing results for each colour separately</a>.
</body>
</html>

gif_lines.asp: