📄 colorblindpie.aspx
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<%@ Page Language="VB" debug="true" Description="dotnetCHARTING Component" %>
<%@ Register TagPrefix="dotnet" Namespace="dotnetCHARTING" Assembly="dotnetCHARTING"%>
<%@ Import Namespace="System.Drawing" %>
<HTML>
<HEAD>
<TITLE>Color Blind Pie</TITLE>
<script runat="server">
Sub Page_Load(sender As [Object], e As EventArgs)
Chart.Type = ChartType.Pies 'Horizontal;
Chart.Width = Unit.Parse(600)
Chart.Height = Unit.Parse(350)
Chart.TempDirectory = "temp"
' This sample demonstrates how to apply markers to the data when differences in color
' are difficult to distinguish.
' First we get our data, if you would like to get the data from a database you need to use
' the data engine. See sample: features/dataEngine.aspx. Or the dataEngine tutorial in the help file.
Dim sc As SeriesCollection = getRandomData()
' The function below takes care of modifying the series.
ModifySeries(sc)
' Add the random data.
Chart.SeriesCollection.Add(sc)
End Sub 'Page_Load
' Markers array
Private Shared defaultDotTypes As ElementMarkerType() = {ElementMarkerType.Circle, ElementMarkerType.FourPointStar, ElementMarkerType.Diamond, ElementMarkerType.FivePointStar, ElementMarkerType.Square, ElementMarkerType.SevenPointStar, ElementMarkerType.Triangle, ElementMarkerType.SixPointStar}
Sub ModifySeries(sc As SeriesCollection)
Dim s As Series
For Each s In sc
' We want the markers to always appear no matter what the chart or series type. This setting will ensure that.
s.DefaultElement.ForceMarker = True
' We also want the marker to appear in the legend so we need to set the series type of the series legend entry.
s.DefaultElement.LegendEntry.SeriesType = SeriesType.Marker
' Each element must also use this marker type and if shown in the legend it must be shown as a marker.
Dim i As Integer
For i = 0 To s.Elements.Count - 1
s.Elements(i).Marker.Type = defaultDotTypes((i Mod defaultDotTypes.Length))
s.Elements(i).LegendEntry.Marker.Type = defaultDotTypes((i Mod defaultDotTypes.Length))
Next i
Next s
End Sub 'ModifySeries
Function getRandomData() As SeriesCollection
Dim SC As New SeriesCollection()
Dim myR As New Random()
Dim a As Integer
For a = 1 To 1
Dim s As New Series()
s.Name = "Series " + a.ToString()
Dim b As Integer
For b = 1 To 4
Dim e As New Element()
e.Name = "Element " + b.ToString()
'e.YValue = -25 + myR.Next(50);
e.YValue = myR.Next(50)
s.Elements.Add(e)
Next b
SC.Add(s)
Next a
' Set Different Colors for our Series
SC(0).DefaultElement.Color = Color.FromArgb(49, 255, 49)
Return SC
End Function 'getRandomData
</script>
</HEAD>
<BODY>
<DIV align="center">
<dotnet:Chart id="Chart" runat="server" Width="568px" Height="344px">
</dotnet:Chart>
</DIV>
</BODY>
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