TDBChart with boolean fields

[Skaw]

Hello,

i have dataset with datetime,boolean and other float values and i wish to show the dataset using tdbchart.

Is there a way to intercept (via on...) the painting of the boolean values to set my own values?

for example:

if value=true then xvalue := maxvalue
else xvalue := 0

Best regards
ilde

[Narcís]

Hi ilde,

Yes, you can do something like this:

Code: Select all

  for i:=0 to NumValues - 1 do
   if YourData[i] then
      Series1.Add(maxvalue)
   else
      Series1.Add(0);

[Skaw]

ok, thank you

but, is there a way to intercept the automatic add from the dataset and where could i do that?

i would not like to use add manually every time the dataset changes.

Best regards
ilde

[Narcís]

Hi ilde,

To refresh your chart's data when the datasource changes you can call Series.CheckDataSource method. However, TeeChart won't handle boolean fields automatically. So, in that case, you'll have to loop through your dataset and manually process boolean fields.