Steema Central

Hi all,

I run TeeChart Pro V 8.06 on Delphi 7. I have an application, that requires logarithmic scaling on the Y-Axis. As long as I use scalings like Minimum = 0 and Maximum = 100 it works. However, I need scaling in very small numbers, e.g. Minimum := 0.000001; Maxiumum := 0.001; I get no Y-Axis labels at all. The Series is drawing all right, but there are no labels.

What am I missing?

Thank you! Michael

Hello all,

I am a bit further, I get some scaling now. However, as soon as I move the chart with the right mouse button, the scaling and the graphic are gone. I have prepared a sample project with some manual data. What am I missing?

Thank you, Michael

Hi Michael,

What about setting bottom axis Increment? For example:
If scrolling logarithmic series out of axis range you may not see any label. Unzooming the chart will display labels again.

Hello Narcis,

I tried the increments you suggested (on bottom axis and on Left axis - you suggested both). However, my main problem now is the scolling (and zooming). Have a look at my sample and try to move (scroll) the chart with the right mouse-button - the graph is not simply moving, but gets deformed or vanishes. You can scroll very carefully a littlebit, if you click as close as possible to the bottom axis into the chart.
A linear chart moves nice around, but the logarithmic chart behaves 'unexpected'.

Best regards, Michael

Hi Michael,

Yes, I'm afraid this is just because of logarithmic axis scaling. Scroll and zoom use axes scales for their calculations instead of screen pixels.