ZedGraph在Asp.net中的应用

Posted on 2007-03-23 17:52 随心所欲阅读(2878) 评论(14) 编辑收藏网摘所属分类: Asp.net2.0 、其他控件

ZedGraph是一个不错的图表报表生成器，以前曾经用过，在asp.net2.0的beta版里面。

现在忽然有可能用到了，但是却一时找不着以前的资料了，方才发现写blog的伟大作用。所以赶紧先把它记下来，以备后用。

1：这是for asp.net的版本。现在win版本的例子代码很多。

2：这里提供的只是一个基本的用法。

3：详细信息：http://zedgraph.org/wiki/index.php?title=Display_Dynamic_or_Real-Time_Data

版本：4.2.1.35091

1：Asp页面上

基本上没有什么技巧，放上这个控件就可以。

Asp Control

2：连接到处理事件，

这个和Win的处理不一样。看这里传入的参数：System.Drawing.Graphics g, MasterPane pane，注意最后的更新方式：pane[0].AxisChange(g);

Event to Draw the Chart
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protected void zgw_graph_RenderGraph(System.Drawing.Graphics g, MasterPane pane)
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{
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if (Request.Params["type"] == null)
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return;
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//get params
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int courseId=0,testId=0,studentId=0;
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if (Request.Params["cid"] != null && Request.Params["cid"].ToString()!="")
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courseId = Convert.ToInt32(Request.Params["cid"]);
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if (Request.Params["tid"] != null && Request.Params["tid"].ToString() != "")
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testId = Convert.ToInt32(Request.Params["tid"]);
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if (Request.Params["sid"] != null && Request.Params["sid"].ToString() != "")
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studentId = Convert.ToInt32(Request.Params["sid"]);
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SorceStat stat = new SorceStat(pane[0]);
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switch (Request.Params["type"].ToLower())
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{
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case "all_students_score_in_one_test":
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stat.AllStudentsScore(courseId,testId);
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break;
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case "one_students_score_in_all_test":
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stat.OneStudentScore(courseId, studentId);
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break;
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case "all_students_score_in_all_test":
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stat.AllStudentsScore(courseId);
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break;
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case "scope_score_in_one_test":
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stat.ScoreScopeCompare(courseId, testId);
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break;
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case "group_avg_score_in_one_test":
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stat.GroupAvgCompare(courseId, testId);
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break;
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case "group_avg_score_in_all_test":
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//stat.GroupAvgCompare(courseId); null now
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break;
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default:
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break;
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}
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pane[0].AxisChange(g);
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}
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3：几种图的使用

Code to Draw every chart
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/// <summary>
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/// make all Stat info and put them into the GraphPane(ZedGraph)
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/// </summary>
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public class SorceStat
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{
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private GraphPane _pane;
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private BasePage _page = new BasePage();
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public SorceStat(GraphPane pane)
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{
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this._pane = pane;
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}
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/// <summary>
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/// all the test
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/// by curve line
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/// </summary>
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/// <param name="courseId"></param>
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public void GroupAvgCompare(int courseId)
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{
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}
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/// <summary>
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/// just a test
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/// by baritem
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/// </summary>
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/// <param name="courseId"></param>
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/// <param name="testId"></param>
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public void GroupAvgCompare(int courseId, int testId)
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{
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//
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//get all then get the ave of it. as it can not use sql derectly
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ObjectSet scores=_page.BizManager.GetObjectSet(typeof(EvGroupScore),"courseId='"+courseId+"' and testId='"+testId+"'");
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Hashtable group = new Hashtable();
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for (int i = 0; i < scores.Count; i++)
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{
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EvGroupScore score = scores[i] as EvGroupScore;
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if (!group.Contains(score.GroupName))
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group.Add(score.GroupName, new GroupScore(score.GroupName));
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(group[score.GroupName] as GroupScore).Count++;
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(group[score.GroupName] as GroupScore).Score += score.Score;
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}
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int index = 0;
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foreach (DictionaryEntry de in group)
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{
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GroupScore score = de.Value as GroupScore;
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this._pane.AddBar(score.GroupName, new double[] { index++ } , new double[] { score.Avg }, GetRandomColor());
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}
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}
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private class GroupScore for recode the group info