B4J Question [xChart] Show a circle on YXChart

[angel_]

I cannot highlight a specific point on a logarithmic scale YXChart1 with a circle:

Private Sub InitYXChart1
    Private i, Nb As Int
    Private m0, n0, m1, n1, m2, n2, m3, n3 As Double
   
    YXChart1.AddYXLine("Freq0", xui.Color_Magenta, 1dip)
    YXChart1.AddYXLine("Freq1", xui.Color_Red, 1dip)
    YXChart1.AddYXLine("Freq2", xui.Color_Blue, 1dip)
    YXChart1.AddYXLine("Freq3", xui.Color_Black, 1dip)
    YXChart1.AddYXLine2("Freq4", xui.Color_Green, 20dip, True, "CIRCLE", True, xui.Color_Green)    '<--- New line
    YXChart1.ScaleYValuesLog = "1!2!3!4!5!6!7!8!9!10"
    YXChart1.ScaleXValuesLog = "1!2!3!4!5!6!7!8!9!10"
    YXChart1.XMinValue = 1
    YXChart1.XMaxValue = 100
    YXChart1.YScaleMinValue = 40
    YXChart1.YScaleMaxValue = 100
   
   
    Nb = 65
    m0 = 3
    n0 = 0.03
    m1 = 10
    n1 = 0.1
    m2 = 20
    n2 = 0.2
    m3 = 30
    n3 = 0.3
    For i = 1 To Nb
        Private x, y0, y1, y2, y3 As Double
       
        x = i + 2
        y0 = m0 / (Power(x, n0) - 1)
        y1 = m1 / (Power(x, n1) - 1)
        y2 = m2 / (Power(x, n2) - 1)
        y3 = m3 / (Power(x, n3) - 1)
        YXChart1.AddYXPoint(0, x, y0)
        YXChart1.AddYXPoint(1, x, y1)
        YXChart1.AddYXPoint(2, x, y2)
        YXChart1.AddYXPoint(3, x, y3)
    Next
    YXChart1.AddYXPoint(4, 5, 60)    '<--- New line
   
    Chart = 1
    YXChart1.DrawChart
End Sub

 

[klaus]

This functionality works currently only for lin - lin scales.

 

[angel_]

Did it work in the past? maybe I'm wrong but I think I remember that it was enabled

 

[klaus]

No, it was never implemented,

 

[klaus]

I have added this feature in version 7.8.

 

[angel_]

I can't see the point, I don't know if I'm using it correctly, should I change the code?

 

[klaus]

Did you download the new xChart.b4xlib ?
Did you set the YXChartDisplayValues property ?

Di

 

[angel_]

I was looking to mark a point on the graph, something like this:

YXChart1.AddYXPoint(4, 5, 60)
YXChart1.AddYXPoint(4.001, 5.001, 60)

 

[klaus]

Sorry, I misunderstood your request.
Moving the cursor on an xChart did not highlight any point with logarithmic scales.
This is what I added.

To your question.
The problem was not only with logarithmic scales it was also with linear scales.
The code below would be better understandable but your code works !

YXChart1.AddYXPoint(4, 5, 60)
YXChart1.AddYXPoint(4, 5.001, 60)

The first parameter is the line index and not the coordinate. Your code works also because the line index is an integer therefore the decimal part is ignored.
It would even have worked if you had added the same point twice.

I was always thinking with lines, and lines need two points.
I should have changed my mind to point sets, which could have only one point, and not lines.
I added the drawing of only one point.
Attached the new library, version 7.9.
I will not yet update it in the xChart thread, I will do it in a further update.