TGraph - setting the scale

[James Bott]

Does anyone know if it is possible to set the scales of a graph programmatically? I want to set the maximum and minimum values of the Y axis. From looking at the class code, it doesn't seem possible.

Regards,
James

[MarcoBoschi]

Dear James,
did you resolve it?
bye
marco

[James Bott]

Marco,

No, I never did. But I didn't really spend much time on it.

My version of TGraph is from 3/23/2008. If you have a newer version of FWH then you might have a newer version of TGraph.prg (in the source folder).

If not, then author's name and email address is in the PRG. You might contact him to see if there is a later version.

Regards,
James

[Silvio.Falconi]

James I not understood how want make if you explain I can try to see it ..

[James Bott]

Silvio,

Currently TGraph figures out the max and min value for each axis based on the data. This can lead to some very odd labeling of increments. For instance the graph I am currently using shows the Y-Axis from 0 to 250 (which is actually OK), but there are only 4 increments for the labels so you get labels of 0.00, 62.50, 125.00, 187.50, 250.00. This isn't actually that bad, but it would be better divided into 5 increments so the labels would read 0, 50, 100, 150, 200, 250.

So, it would seem that the easiest way to handle this would be to allow the programmer to set the min and max of the axis and the number of increments for the labeling.

I don't need this for the x-axis right now, but I am sure it would also be useful.

Of course, it would still be useful to have it operate as it does now since you often don't know the range of the data you are processing.

Since TGraph is a very complex program capable of doing some complex graphing it would probably be best if we could get the author to add these features.

For me the changes are not a pressing need, since I have been using this chart for a couple of years now. Others may need this capability though.

I wish to thank Alfredo Arteaga, the author of TGraph for writing this awesome program. One of the very first programs I wrote almost 30 years ago, was a graphing program and it was not easy.

Regards,
James

[MarcoBoschi]

James,
Thank you very much.
In Italy "just in time" means "I do not know what to do" "but tomorrow it must be on line"
I will try to adapt it to my need
marco

[Marcelo Via Giglio]

Hola

a work around can be

Code: Select all  Expand view

...
DATA nMax INIT 0
...
 

and in the paint method change ( and IF ) this lines to show like this

Code: Select all  Expand view

  // Max, Min values
      IF ::nMax != 0
      nMax := IF( ::nMaxVal <> 0 , ::nMaxVal , 0 )
      FOR nJ := 1 TO Len( ::aSeries )
          FOR nI :=1 TO Len( ::aData[nJ] )
              nMax := Max( ::aData[nJ][nI], nMax )
          NEXT nI
      NEXT nJ
   ELSE
      nMax := ::nMax
   ENDIF
 

Exactly the same for the minimums value

regards

Marcelo

[RSalazarU]

Hola:
Hace tiempo publique esto:

http://forums.fivetechsupport.com/viewtopic.php?f=6&t=19894

http://forums.fivetechsupport.com/viewtopic.php?f=6&t=20060

y ahora acabo de actualizar el archivo http://www.sauro-sys.com/Source/tgraph.rar

Atentamente,

Rolando Salazar Ureña
http://www.sauro-sys.com
email: SauroSys@sauro-sys.com
Cochabamba-Bolivia

PD. Espero que les sirva

[MarcoBoschi]

OK
MANY THANKS

[James Bott]

Marco,

Were you ever able to set the range of the Y-axis?

James

[damianodec]

hallo,
can you post a samples of tgraph use?
thanks

[James Bott]

damianodec,

>can you post a samples of tgraph use?

There is a test.prg in the TGraph file that shows a number of example graphs.

Regards,
James