Category: .NET Trend

The following two (2) examples are for WinForm and WPF applications on how to add pens to a trend window during runtime programmatically.


WinForm:

Dim NewPen As OPCTrendControl.ClassPen

Dim NewPens As OPCTrendControl.ClassPen()

ReDim NewPens(2)

If NetworkPath = “””” Then

NewPen = New OPCTrendControl.ClassPen(NetworkPath + “”Ramp.Value””, “”localhost””)

Else

NewPen = New OPCTrendControl.ClassPen(NetworkPath + “”Ramp.Value””, NetworkNode)

End If

NewPen.LineBorderColor = Color.Blue

NewPen.LineFillColor = Color.Blue

NewPen.Description = “Ramp”

NewPen.LineStyle = OPCTrendControl.ClassPen.LineStyleTypes.Ellipsoid

NewPens(0) = NewPen



If NetworkPath = “” Then

NewPen = New OPCTrendControl.ClassPen(NetworkPath + “”Sine.Value””, “”localhost””)

Else

NewPen = New OPCTrendControl.ClassPen(NetworkPath + “”Sine.Value””, NetworkNode)

End If



NewPen.LineBorderColor = Color.Red

NewPen.LineFillColor = Color.Red

NewPen.Description = “Sine”

NewPen.YAxisRangeHigh = 1

NewPen.YAxisRangeLow = -1

NewPen.LineStyle = OPCTrendControl.ClassPen.LineStyleTypes.Tube

NewPens(1) = NewPen



If NetworkPath = “” Then

NewPen = New OPCTrendControl.ClassPen(NetworkPath + “”Random.Value””, “”localhost””)

Else

NewPen = New OPCTrendControl.ClassPen(NetworkPath + “”Random.Value””, NetworkNode)

End If



NewPen.LineBorderColor = Color.Green

NewPen.LineFillColor = Color.Green

NewPen.Description = “Random”

NewPen.MarkerFillColor = Color.Green

NewPen.MarkerStyle = OPCTrendControl.ClassPen.MarkerStyleTypes.Sphere

NewPen.MarkerSize = 20

NewPens(2) = NewPen



frmTrend.OpcTrendControl1.Pens = NewPens



WPF:



VB

Dim Pens As New OPCWPFDashboard.PensList

Dim NewPen As New OPCTrendControl.ClassPen



‘Add Ramp Pen

NewPen = New OPCTrendControl.ClassPen(“Ramp.Value”, “localhost”)

NewPen.Units = “”MGD””

NewPen.YAxisRangeHigh = 2

NewPen.LineStyle = OPCTrendControl.ClassPen.LineStyleTypes.Line

NewPen.Description = “Ramp Value”

Pens.Add(NewPen)



‘Add Random

NewPen = New OPCTrendControl.ClassPen(“Random.Value”, “localhost”)

NewPen.Units = “NTU”

NewPen.Description = “Random Pen”

Pens.Add(NewPen)

OPCWPFTrend1.Pens = Pens



C#

OPCWPFDashboard.PensList Pens = new OPCWPFDashboard.PensList();

OPCTrendControl.ClassPen NewPen = new OPCTrendControl.ClassPen();



//Add Ramp Pen

NewPen = new OPCTrendControl.ClassPen(“Ramp.Value”, “localhost”);

NewPen.Units = “MGD”;

NewPen.YAxisRangeHigh = 2;

NewPen.LineStyle = OPCTrendControl.ClassPen.LineStyleTypes.Line;

NewPen.Description = “Ramp Value”;

Pens.Add(NewPen);



//Add Random

NewPen = new OPCTrendControl.ClassPen(“Random.Value”, “localhost”);

NewPen.Units = “NTU”;

NewPen.Description = “Random Pen”;

Pens.Add(NewPen);

OPCWPFTrend1.Pens = Pens

Create a String Tag with the Trend Point property enabled. Add the String Tag to the Trend Window as a new Pen. In one of the other existing pens where you want the annotation to appear on set the property Pen.LabelAnnotationTag to the String Tag. Set the Data Logging Group to the String Tag to a String field you will be updating directly from your application.

Set YAxis-ScaleMode to one of the Stacked chart types. Set each Pen’s StackedChartNumber to the desired stacked chart to display the pen.

No, OPCTrend.NET is a client/server architecture that does not require DCOM and the communications uses the built in networking to the .NET Framework. This makes it possible for trend clients to view real-time data and historical data with OPCDatabase.NET from anywhere in the world over the Internet.

The OAS Service can bring in data values from Data Access OPC Servers, Data Access OPC Clients, databases like SQL Server, Oracle, Access, and mySQL, Microsoft Excel, and .NET applications (web, WinForm, WCF, WPF, and Windows Services).

The values can then be cached for unlimited trend clients and logged to databases with OPCDatabase.NET. Trend clients can be running on both Windows Operating systems and non Windows Operating systems like smart phones and the iPads.

Visit the Trend .Net Product page for more information and to run a live example.

Make sure the date and time span is defined to return a subset of data instead of all of the data. You can also reindex the database in SQL Server to run faster. Reorganizing and Rebuilding Indexes https://msdn.microsoft.com/en-us/library/ms189858.aspx