Steema Central

Posted: **Fri Sep 04, 2015 1:35 pm**

My situation is complicated. We are using TChart to populate it with patterns on a circuit board. The patterns each are series. The circuit board is an image. See attachment.

We have countless series based on the number of patterns. What we are adding is grip handles on the patterns. These will be point series.

I wish to create the grip handle point series at design time since they are a constant number (being 4). The problem is that with them being created first they are behind the patterns and circuit board.

How can i bring the grip handle point series to the front. I have read about zorder and exchange. However, with us having a varied number of other series how can I set the grip handle point series to the front?

The only alternative it to create the grip handle point series after the other series are created to ensure that they reside on the top. However, this could cause problems with pattern changes, etc.

Posted: **Mon Sep 07, 2015 7:55 am**

Hello,

So resuming, you have a set of known series you want to be on the front, and you want to check it several times or at least at runtime.
We could take this simple example then, where I create some bars and lines. As you'll see, at the start some bars overlap some lines.
But the TLineSeries have been added to SeriesOnFront TChartSeriesList and if you click on the Button the series on that list are moved to the front.

Code: Select all

uses Series;

var SeriesOnFront: TChartSeriesList;

procedure TForm1.FormCreate(Sender: TObject);

  procedure CreateLine;
  begin
    SeriesOnFront.Add(Chart1.AddSeries(TLineSeries));
    with Chart1[Chart1.SeriesCount-1] as TLineSeries do
    begin
     FillSampleValues;
     Pen.Width:=2;
     Title:='Line' + IntToStr(Chart1.SeriesCount);
    end;
  end;

  procedure CreateBar;
  begin
    with Chart1.AddSeries(TBarSeries) as TBarSeries do
    begin
     FillSampleValues;
     Marks.Visible:=false;
     Title:='Bar' + IntToStr(Chart1.SeriesCount);
    end;
  end;

begin
  Chart1.View3D:=false;

  SeriesOnFront:=TChartSeriesList.Create;

  CreateBar;
  CreateLine;
  CreateBar;
  CreateLine;
  CreateBar;
  CreateLine;
end;

procedure TForm1.Button1Click(Sender: TObject);
var i, j: Integer;
begin
  for i:=Chart1.SeriesCount-1 downto 1 do
    if SeriesOnFront.IndexOf(Chart1[i]) = -1 then
      for j:=i-1 downto 0 do
        if SeriesOnFront.IndexOf(Chart1[j]) > -1 then
        begin
          Chart1.ExchangeSeries(i, j);
          Break;
        end;
end;

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