TAChart static axis values

[Leledumbo]

I need to have static axis values for TAChart. I want the left axis always and only shows 1,2,3, and 4 (inverted) and the bottom always and only shows 1,2,3 up to 7 regardless either window size or the plotted data. How can I achieve it?

[lightningchaser]

see this topic, you will need a recent build
http://forum.lazarus.freepascal.org/index.php/topic,8887.0.html

[Leledumbo]

I know, you see I also post there. The problem is: how? what properties should be modified in object inspector? I try to use Extent, but when maximized the graph has 1.5, 2.5, and 3.5 as well. I only want the integers.

[lightningchaser]

I know, you see I also post there. The problem is: how? what properties should be modified in object inspector? I try to use Extent, but when maximized the graph has 1.5, 2.5, and 3.5 as well. I only want the integers.

you should use "ListChartSource1.DataPoints.Add", the items seem seperated by a pipe symbol.

make sure the source of the marks point to the listchartsource1 and style is set to smsLabel.

I did use this code to show the date on the axis:

Code: [Select]

 dateaxis:=encodedatetime(yearof(now),1,1,0,0,0,0);

  for i:=1 to DaysInYear(dateaxis) do begin

    //show first day of the month
    if DayOfTheMonth(dateaxis)=1 then begin
      ListChartSource1.DataPoints.Add(inttostr(i)+'|'+inttostr(i)+'|?|'+formatdatetime('yyyymmdd',dateaxis)+'');
    end else begin
      //show first day of the week
      if (dayoftheweek(dateaxis)=1) then
        ListChartSource1.DataPoints.Add(inttostr(i)+'|'+inttostr(i)+'|?|'+formatdatetime('yyyymmdd',dateaxis));
    end;

    dateaxis:=incday(dateaxis,1);
  end;    


[Ask]

The problem is: how? what properties should be modified in object inspector?

First, is you do not already, you have to use recent svn version.
Using it, you can look at components/tachart/demo/axis folder for a sample project.

You should use "ListChartSource1.DataPoints.Add", the items seem seperated by a pipe symbol.

Well, I really should write some documentation sometime...
Anyway, DataPoints property is mainly intended to allow design-time editing of
list source data.
If you are adding data at run-time, it is more efficient and convenient to
use TListChartSource.Add method:

Code: [Select]

ListChartSource1.Add(i, i, clTAChart, formatdatetime('yyyymmdd',dateaxis));
Also, if you have many data points and want to generate them on-the-fly instead of
storing inside of the source, you can use TUserDefinedChartSource.

[Leledumbo]

I found it. The axis also has Source property, which I can use to assign different values for left and bottom axis.