Strip Chart for the CUWIN

[Mike]

This Visual Studio project demonstrates a strip chart control. The project is a .Net Compact Framework 3.5 project for the CUWIN 5000/6000 series, but the code can be copied without modification into a .Net Compact Framework 2.0 project for use on the CUWIN 3000/4000 series.

Screenshot

screenshot.jpg (40.82 KiB) Viewed 2359 times

How to use it.

1. Create one or more StripChart.Line objects. The last parameter is actually a function that the StripChart control will call every StripChart.UpdateInterval milliseconds.
C#

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_sine = new StripChart.Line(Color.FromArgb(0xFF, 0x00, 0x00), ComputeSine);
_cosine = new StripChart.Line(Color.FromArgb(0x00, 0x00, 0xFF), ComputeCosine);

private StripChart.Line.DataPoint ComputeSine()
{
    double t = (double)GetTickCount() / 1000.0d - _t0;
    double amplitude = (_stripChart.YMaximum - _stripChart.YMinimum) / 2.0d;
    return new StripChart.Line.DataPoint(t, amplitude * Math.Sin(Frequency * t));
}

private StripChart.Line.DataPoint ComputeCosine()
{
    double t = (double)GetTickCount() / 1000.0d - _t0;
    double amplitude = (_stripChart.YMaximum - _stripChart.YMinimum) / 2.0d;
    return new StripChart.Line.DataPoint(t, amplitude * Math.Cos(Frequency * t));
}

VB

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_sine = New StripChart.Line(Color.FromArgb(&HFF, &H0, &H0), AddressOf ComputeSine)
_cosine = New StripChart.Line(Color.FromArgb(&H0, &H0, &HFF), AddressOf ComputeCosine)

Private Function ComputeSine() As StripChart.Line.DataPoint
    Dim t As Double = CDbl(GetTickCount()) / 1000.0 - _t0
    Dim amplitude As Double = (_stripChart.YMaximum - _stripChart.YMinimum) / 2.0
    Return New StripChart.Line.DataPoint(t, amplitude * Math.Sin(Frequency * t))
End Function

Private Function ComputeCosine() As StripChart.Line.DataPoint
    Dim t As Double = CDbl(GetTickCount()) / 1000.0 - _t0
    Dim amplitude As Double = (_stripChart.YMaximum - _stripChart.YMinimum) / 2.0
    Return New StripChart.Line.DataPoint(t, amplitude * Math.Cos(Frequency * t))
End Function

2. Add the Lines to the StripChart control.
C#

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_stripChart.AddLine(_sine);
_stripChart.AddLine(_cosine);

VB

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_stripChart.AddLine(_sine)
_stripChart.AddLine(_cosine)

3. Specify how often the StripChart control should update.
C#

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_stripChart.UpdateInterval = 100;

VB

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_stripChart.UpdateInterval = 100

4. Specify the minimum and maximum values for the Y Axis using StripChart.YMinimum and StripChart.YMaximum.

5. Specify the amount of time one full screen should be with StripChart.Range. Be sure StripChart.Range, StripChart.XAxisGridLines.OnEvery, and DataPoint.X all use the same units (i.e. minutes, seconds, milliseconds, etc...)

6. (Optional) Add grid lines. Example: If StripChart.YMinimum is -100.0 and StripChart.YMaximum is +100.0 and YAxisGridLines.OnEvery = 20.0, then there will be one grid line for every 20.0 units between -100 and 100, for a total of 10 divisions.
C#

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_xAxisGridLines = new StripChart.GridLines(Color.FromArgb(0x99, 0x99, 0x99), 1.0d);
_yAxisGridLines = new StripChart.GridLines(Color.FromArgb(0x99, 0x99, 0x99), 20.0d);

_stripChart.XAxisGridLines = _xAxisGridLines;
_stripChart.YAxisGridLines = _yAxisGridLines;

VB

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_xAxisGridLines = New StripChart.GridLines(Color.FromArgb(&H99, &H99, &H99), 1.0)
_yAxisGridLines = New StripChart.GridLines(Color.FromArgb(&H99, &H99, &H99), 20.0)

_stripChart.XAxisGridLines = _xAxisGridLines
_stripChart.YAxisGridLines = _yAxisGridLines

This code can be optimized to provide better performance, but it will make it quite a bit more complicated. I hope, at least, this can serve as a model from which you can make your own implementation.