Example code using groups

nile · Post by **nile** » Wed Jan 21, 2009 9:18 pm

Hi,

Is there an example code of how to use chart groups? While easy enough to create from within the chart editor, getting them to display at runtime seems elusive.

nsm

Narcís · Post by **Narcís** » Thu Jan 22, 2009 8:38 am

Hi nile,

You can use series groups like this:

Code: Select all

Chart1.SeriesGroups.Add;
Chart1.SeriesGroups.Items[0].Add(point1);
Chart1.SeriesGroups.Clear;

nile · Post by **nile** » Fri Jan 23, 2009 1:31 am

Hi Narcis,

Thanks for your reply. However, this isn't quite what i had in mind. The interface I'm designing is zero code based, as all data is processed via dbchart from a virtual table. As such, using the charteditor, lets say i've got 3 groups. All, Std, Financial. Let's now add a combo box with these choices. Then ideally, if the user chooses Std, I would like my ChartListBox to display only the charts contained by the Financial group (and in order).

For this i was expecting something like:

ChartListBox->SeriesGroup = Chart->SeriesGroups->Items[0];

But when i do this, my ChartListBox is empty.

Cheers, Nile.

Narcís · Post by **Narcís** » Fri Jan 23, 2009 8:29 am

Hi Nile,

Currently TChartListBox component doesn't support series groups. I added your request to the wish-list. In the meantime, you'll have to add all series in a group to TChartListBox.

nile · Post by **nile** » Fri Jan 23, 2009 9:30 pm

Ah, okay. Would have thought this to be a natural extension of having groups with the listbox. Meanwhile is there an alternative you can suggest?

If I can cycle through the list of series available in a specific group, then I should be able to turn off the visibility that are not in the all group - or something similar?

Thanks, nile.

Narcís · Post by **Narcís** » Mon Jan 26, 2009 9:22 am

Hi nile,

Yes, you can do something like this:

Code: Select all

void __fastcall TForm4::FormCreate(TObject *Sender)
{
	Chart1->SeriesGroups->Add();
	Chart1->SeriesGroups->Items[0]->Add(Series1);
	Chart1->SeriesGroups->Items[0]->Add(Series2);

	Chart1->SeriesGroups->Add();
	Chart1->SeriesGroups->Items[1]->Add(Series3);
	Chart1->SeriesGroups->Items[1]->Add(Series4);

	for (int i = 0; i < Chart1->SeriesGroups->Items[0]->Series->Count; i++) {
		ChartListBox1->AddItem(Chart1->SeriesGroups->Items[0]->Series->Items[i]->Name,
								Chart1->SeriesGroups->Items[0]->Series->Items[i]);
	}
}

Hope this helps!

nile · Post by **nile** » Mon Jan 26, 2009 8:52 pm

Got it - looks like this will do just fine.

Many thanks,
Nile.