To define custom point style condition the user must set Selection property of PointStyle to PointStyleSelectionEnum.Custom and provide event handler for the Select event. The following code creates a custom point style:
To write code in Visual Basic
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Copy Code
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Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)_ Handles Button1.Click
' create point style
Dim ps As C1.Win.C1Chart.PointStyle = New C1.Win.C1Chart.PointStyle()
' custom point style
ps.Selection = C1.Win.C1Chart.PointStyleSelectionEnum.Custom
AddHandler ps.Select, AddressOf PS_Select
' add point style
c1Chart1.ChartGroups(0).ChartData.PointStylesList.Add(ps)
End Sub
Private Sub PS_Select(ByVal sender As Object, ByVal e As _ C1.Win.C1Chart.PointStyleSelectEventArgs)
Dim ps As C1.Win.C1Chart.PointStyle = CType(sender, C1.Win.C1Chart.PointStyle)
' set visual appearance depending on y value
Dim ds As C1.Win.C1Chart.ChartDataSeries = _ c1Chart1.ChartGroups(0).ChartData(e.SeriesIndex)
Dim y As Double = Convert.ToDouble(ds.Y(e.PointIndex))
If (y < 0) Then
ps.LineStyle.Color = Color.Blue
Else
ps.LineStyle.Color = Color.Red
End If
' apply to all points
e.Selected = True
End Sub
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To write code in C#
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Copy Code
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private void button1_Click(object sender, System.EventArgs e)
{
// create point style
C1.Win.C1Chart.PointStyle ps = new C1.Win.C1Chart.PointStyle();
// custom point style
ps.Selection = C1.Win.C1Chart.PointStyleSelectionEnum.Custom;
ps.Select += new C1.Win.C1Chart.PointStyleSelectEventHandler(PS_Select);
// add point style
c1Chart1.ChartGroups[0].ChartData.PointStylesList.Add( ps);
}
private void PS_Select( object sender, C1.Win.C1Chart.PointStyleSelectEventArgs e)
{
C1.Win.C1Chart.PointStyle ps = sender as C1.Win.C1Chart.PointStyle;
// set visual appearance depending on y value
C1.Win.C1Chart.ChartDataSeries ds = c1Chart1.ChartGroups[0].ChartData[e.SeriesIndex];
double y = Convert.ToDouble( ds.Y[e.PointIndex]);
if( y<0)
ps.LineStyle.Color = Color.Blue;
else
ps.LineStyle.Color = Color.Red;
// apply to all points
e.Selected = true;
}
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A custom blue point style is created for Y values less than zero and a custom red point style is created for y values greater than zero.
