Logarithmic scale with base 10 issue

[PoLabs]

Hi,

I am using logarithmic scale with base of 10 on bottom axis. I have data which index goes from 1 to 1000000 in (on bottom axis) and I would like to represent this as logarithmic scale. On first attached image (Image1) I don't set AxisValuesFormat and I get values for labels on bottom axis from 1 to 1000000 when I set AxisValuesFormat to 00e-0 I get 10^0 10^1 etc but regarding previous scale it is wrong. Take a look at second attached image (Image2). If you compare you will see that in first case scale goes from 1 to 1000000 in second case it goes from 10^-1 to 10^5 which is by factor 10 less. Where there is 1 it should be 10^0 etc...

Is something wrong with my approach or maybe I have wrong format 00e-0? Thanks for help.

Image1

AxisValuesFormat not set. Bottom axis is logarithmic.

Slika1.jpg (129.63 KiB) Viewed 5651 times

Image2

AxisValuesFormat set to 00e-0. Bottom axis is logarithmic.

slika2.jpg (128.41 KiB) Viewed 5625 times

Br,
Po

[Yeray]

Hi Po,

This is a known problem already in the defect list to be fixed in future releases (TV52014469).

As a workaround, you can use OnGetAxisLabels and multiply the labels by 10:

Code: Select all

procedure TForm1.Chart1GetAxisLabel(Sender: TChartAxis;
  Series: TChartSeries; ValueIndex: Integer; var LabelText: String);
begin
  if Sender = Chart1.Axes.Bottom then
    LabelText := FormatFloat('00e-0', StrToFloat(LabelText) * 10);
end;

[PoLabs]

Hi,

Thanks for answer and solution.

Br

[PoLabs]

Hi,

I wonder if bug TV52014469 has been already fixed?

Thanks for answer.

[Yeray]

Hello,

I'm afraid not yet. I recommend you to be aware at this Support forums, to subsribe to our RSS news feed, or to follow us on Twitter or Facebook for new release announcements and what's implemented on them.