NSurvey - Pie Charts

NSurvey already provides general charts displaying the results, but it uses a bar chart and I had to output pie charts as well. So, I implemented them as well.

First, I created a new page, called PieChartReport.aspx, which was empty. After this I used the same code as the BarChartReport and filled up a ChartPointCollection, which I then used to create a new PieChart, render it and send it back to the client

[csharp] ChartEngine engine = new ChartEngine(); ChartCollection charts = new ChartCollection(engine);

engine.Size = new Size(350, 400); engine.Charts = charts; engine.Title = new ChartText();

if (questions.Questions[0].IsParentQuestionIdNull()) { engine.Title.Text = Server.HtmlDecode( Regex.Replace(questions.Questions[0].QuestionText, "<[^>]>", " ")); } else { String questionText = String.Format("{0} - {1}", questions.Questions[0]["ParentQuestionText"].ToString(), questions.Questions[0].QuestionText); questionText = questionText.Replace(Environment.NewLine, ""); questionText = questionText.Replace("\t", ""); questionText = questionText.Replace("

", ""); questionText = questionText.Replace("

", ""); engine.Title.Text = Server.HtmlDecode( Regex.Replace(questionText, "<[^>]>", " ")); }

PieChart pie = new PieChart(data); engine.Charts.Add(pie); ChartLegend legend = new ChartLegend(); legend.Position = LegendPosition.Bottom; engine.HasChartLegend = true; engine.Legend = legend; engine.GridLines = GridLines.None; [/csharp]

Update: I used the following control by the way (which was already in NSurvey): http://www.carlosag.net/Tools/WebChart/Default.aspx

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