利用office web component打造精品图表(一)
大家在编写ASP程序的时候，可能要对各种指标以图形的方式显示出来。如果仅仅是柱状图，可以采用画表格的方法。许多投票程序多采用这种方法。如果是饼状图或从数据库中检索数据后再显示，就有些困难了.办法也有，自己可以封装excel来完成上述功能，或者用deiphi做一个activeform传入参数,或者用php来写,java也可以。当然，用一个比较成熟的图形组件来完成更好一些。microsoft office web compoent非常不错。我在开发一个项目的时候，用到了这个组件。
CHART.ASP程序。
<% Option Explicit %>
<!--#include file="adovbs.inc"-->
<HTML>
<HEAD>
<TITLE>柱状图的例子</TITLE>
<%
Function ExportChartToGIF(objCSpace, strAbsFilePath, strRelFilePath)
Dim strFileName
Randomize
strFileName = Timer & Rnd & ".gif"
objCSpace.ExportPicture strAbsFilePath & "\" & strFileName, "gif", 650, 400
ExportChartToGIF = strRelFilePath & "/" & strFileName
End Function
Sub CleanUpGIF(GIFpath)
Dim objFS
Dim objFolder
Dim gif
set objFS = Server.CreateObject("Scripting.FileSystemObject")
set objFolder = objFS.GetFolder(GIFpath)
for each gif in objFolder.Files
if instr(gif.Name, ".gif") > 0 and
DateDiff("n", gif.DateLastModified, now) > 10 then
objFS.DeleteFile GIFpath & "\" & gif.Name, True
end if
next
set objFolder = nothing
set objFS = nothing
End Sub
%>
</HEAD>
<BODY BGCOLOR="#FFFFFF">
<div align="center">
<br>
<br>
<%
dim sj1,sj2
sj1=Request.QueryString("s1")
sj2=Request.QueryString("s2")
dim objChartSpace
dim objChart
dim objSeries
dim objConn
dim objRS
dim c
dim series
dim strChartAbsPath
dim strChartRelPath
dim strChartFile
dim axis
strChartAbsPath = Server.MapPath("/xjsi-web/dcss/chart")
strChartRelPath = "/xjsi-web/dcss/chart"
'设置组件
set objChartSpace = Server.CreateObject("OWC.Chart")
set objChart = objChartSpace.Charts.Add
set c = objChartSpace.Constants
||||||objChartSpace.Border.Color="red"
'以柱状图显示
objchart.type=1
objChart.HasLegend = True'是否显示图例
objChartSpace.HasChartSpaceTitle=true '显示标题
objChartSpace.ChartSpaceTitle.Caption ="柱状图的例子使用office web组件--www.ourfly.com中文技术网站"
set objConn = Server.CreateObject("ADODB.Connection")
objConn.Open application("strconn")
set objRS = Server.CreateObject("ADODB.Recordset")
set objRS.ActiveConnection = objConn
objRS.CursorType = adOpenStatic
objRS.CursorLocation = adUseClient
objRS.Open "select dwsj,sum(jfrs) as jfrs
from dcss_do_jfgcfxb where dwsj>='"&sj1&"' and dwsj<'"&sj2&"'
group by dwsj order by dwsj asc"
set objChartSpace.DataSource = objRS
'显示图例内容
objChart.SetData c.chDimSeriesNames, 0, "jfrs"
for each objSeries in objChart.SeriesCollection
objSeries.SetData c.chDimCategories, 0, "dwsj"
objSeries.SetData c.chDimValues, 0, "jfrs"
next
for each axis in objChart.Axes
axis.HasTitle = True
if axis.Type = c.chCategoryAxis then
axis.Title.Caption = "月份"
else
axis.Title.Caption = "人数"
end if
next
strChartFile = ExportChartToGIF(objChartSpace, strChartAbsPath, strChartRelPath)
Response.Write "<IMG SRC=""" & strChartFile & """>" & "<P>"
CleanUpGIF strChartAbsPath
objRS.Close
set objRS = nothing
set objConn = nothing
set objSeries = nothing
set objChart = nothing
set objChartSpace = nothing
%>
</div>
</BODY>
</HTML>
使用这个组件的注意事项：
1。在office2000的光盘上，有一个msowc.msi的可执行文件.OK
2。建议大家用visual interdev6.0开发，代码的自动提示功能此时会发挥出极大的作用。
