Steema Central

Posted: **Mon Jun 13, 2022 4:37 pm**

I have some questions about loading TChart options from previously saved *.tee files.

The tee files have been saved using a call like this:

Code: Select all

SaveChartToFile(Chart, filename, false, true);

The false flag means that the data in the graph is NOT included in the tee file (which I have checked).

When I use the function LoadChartFromFile(Chart, filename) to reinstate the graph's options, the data disappears from my chart (but the options saved in the tee file are applied as expected).

Q1. What do I have to do to redraw the graph with the new options?

Q2. What function should I call to load the graph options from a previously saved XML file?

I would prefer to save the graph options in XML format, using using a call like this:

Code: Select all

SaveChartToXMLFile(Chart, filename, false, true);

where the final true flag denotes inclusion of the XML header.

However, I cannot find a function that allows me to load the options from this XML file. There is no LoadChartFromXMLFile function, AFAIK, and the LoadChartFromFile function issues an error if it is passed an XML file.

What am I missing here?

Thanks in advance fort any help anyone can give.

Andrew

Posted: **Mon Jun 13, 2022 5:06 pm**

I have found the function LoadChartFromXMLFile but ...

After I have saved the same options to both the tee file and the xml file and then load those files, the tee file works as expected (apart form the data not being drawn) but the XML file does not. I attach three screenshots showing what I am getting:

Screenshot 1 = before saving to *.tee and *.xml files

: Screenshot1.jpg (41.83 KiB) Viewed 3607 times

Screenshot 2 = after loading *.tee and *.xml file

: Screenshot2.jpg (25.81 KiB) Viewed 3607 times

Screenshot 3 = after loading *.xml file

: Screenshot3.jpg (20.59 KiB) Viewed 3607 times

Has anyone had this problem before?

Posted: **Wed Jun 29, 2022 2:51 pm**

Hello,

I've done a test and it seems to work fine for me here both without and with data:

: withoutData.png (26.59 KiB) Viewed 3416 times

: withData.png (50.37 KiB) Viewed 3416 times

Note I'm using streams instead of files, but it shouldn't be very different:

Code: Select all

uses Chart, Series, TeeGDIPlus, TeeStore, TeeProcs;

var origChart, teeChart, xmlChart: TChart;

procedure TForm1.FormCreate(Sender: TObject);
var i: Integer;
    teeStream, xmlStream: TMemoryStream;
const withData=false;
begin
  //Create origChart
  origChart:=TChart.Create(Self);
  origChart.Parent:=Self;
  origChart.View3D:=False;
  origChart.Gradient.Visible:=False;
  origChart.Color:=clWhite;
  origChart.Walls.Back.Gradient.Visible:=False;
  origChart.Walls.Back.Color:=clWhite;
  origChart.Title.Text.Text:='Original Chart';
  origChart.Legend.CheckBoxes:=True;
  origChart.Legend.Alignment:=laBottom;

  for i:=0 to 3 do
    origChart.AddSeries(TLineSeries).FillSampleValues;

  //Export to tee stream
  teeStream:=TMemoryStream.Create;
  SaveChartToStream(origChart, teeStream, withData);

  //Load tee stream to teeChart
  teeStream.Position:=0;
  teeChart:=TChart.Create(Self);
  LoadChartFromStream(teeChart, teeStream);
  teeChart.Parent:=Self;
  teeChart.Title.Text.Text:='Chart from tee stream';
  teeChart.Top:=origChart.Height+10;

  //Export to xml stream
  xmlStream:=TMemoryStream.Create;
  SaveChartToXMLStream(origChart, xmlStream, withData);

  //Load tee stream to teeChart
  xmlStream.Position:=0;
  xmlChart:=TChart.Create(Self);
  LoadChartFromStream(xmlChart, ConvertXMLToText(xmlStream));
  xmlChart.Parent:=Self;
  xmlChart.Title.Text.Text:='Chart from xml stream';
  xmlChart.Top:=origChart.Height+10;
  xmlChart.Left:=origChart.Width+10;
end;

initialization
  RegisterTeeStandardSeries;

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