Android Question xGraph Class and b4xlib - Not siplaying line graph traces when Manual Scaling selected.

rgarnett1955 said:

Hi,

Trying to use xGraph to display Power Line Voltage and frequency, but when I select manual scaling and provide the ranges the graphs don't display the lines.

The cursors show the data points as I expect they get these from the y Value arrays.

This is my function with test data:

B4X:

Private Sub InitGraphX1
    Private i As Int
 
    xGraph1.CurveYName(0) = "Voltage RMS"
    xGraph1.SetScaleManu(0, 220, 270)
    xGraph1.CurveYName(1) = "Frequency Hz"
    xGraph1.SetScaleManu(1, 48.5, 51.5)
 
    xGraph1.CurvesToDisplay.Initialize2(Array As Int(0, 1))
 
    Private x0 = -120 * 30 As Int
    Samples = NWServ.NO_SAMPLES
    xGraph1.NbSamples = Samples + 1
    For i = 0 To Samples
        xGraph1.CurveX(i) = (i + x0) / 30
        xGraph1.CurveY(0, i) = 1 * SinD(i * 0.1) + 247
        xGraph1.CurveY(1, i) = 0.1 * CosD(i * 0.1)
    Next
 

'    xGraph1.Title = "Test"
'    xGraph1.SetZoomIndexes(5, 295)
'    xGraph1.ScaleYValues = "1!3!10"
'    xGraph1.DisplayCurveUnit = False
'    xGraph1.DisplayCurveIndex = False

    xGraph1.DrawGraph
End Sub

Works fine on auto, but I don't want auto on this data as I want a consistent scaling that does not confuse the operator.

Best regards

Rob

Click to expand...

rgarnett1955 said:

Hi,

Trying to use xGraph to display Power Line Voltage and frequency, but when I select manual scaling and provide the ranges the graphs don't display the lines.

The cursors show the data points as I expect they get these from the y Value arrays.

This is my function with test data:

B4X:

Private Sub InitGraphX1
    Private i As Int
  
    xGraph1.CurveYName(0) = "Voltage RMS"
    xGraph1.SetScaleManu(0, 220, 270)
    xGraph1.CurveYName(1) = "Frequency Hz"
    xGraph1.SetScaleManu(1, 48.5, 51.5)
  
    xGraph1.CurvesToDisplay.Initialize2(Array As Int(0, 1))
  
    Private x0 = -120 * 30 As Int
    Samples = NWServ.NO_SAMPLES
    xGraph1.NbSamples = Samples + 1
    For i = 0 To Samples
        xGraph1.CurveX(i) = (i + x0) / 30
        xGraph1.CurveY(0, i) = 1 * SinD(i * 0.1) + 247
        xGraph1.CurveY(1, i) = 0.1 * CosD(i * 0.1)
    Next
  

'    xGraph1.Title = "Test"
'    xGraph1.SetZoomIndexes(5, 295)
'    xGraph1.ScaleYValues = "1!3!10"
'    xGraph1.DisplayCurveUnit = False
'    xGraph1.DisplayCurveIndex = False

    xGraph1.DrawGraph
End Sub

Works fine on auto, but I don't want auto on this data as I want a consistent scaling that does not confuse the operator.

Best regards

Rob

Click to expand...

klaus said:

Thank you for reporting this bug.
The class and b4xlib have been updated in the first post of the xGraph thread.

Click to expand...