TChart：获取带有系列标题的标记样式及其值

Question

我有一个条形系列，我想在其中设置包含系列标题和条形实际值的标记样式。这是我的代码：

procedure TFRDept.PopulateDeptChart;
var
    Loop ,YearIndex: integer;
    DeptKey: String;
    StartBar, TotalBar, EndBar : TBarSeries;
begin

    for Loop := 0  to FDeptList.Count -1 do
    begin
        DeptKey := FDeptList.ValueFromIndex[Loop];

        StartBar :=  GetInsertedBarSeries(DeptKey+'Start', 'Start', clGreen);
        TotalBar :=  GetInsertedBarSeries(DeptKey+'Total', 'Total', clBlue);
        EndBar   :=  GetInsertedBarSeries(DeptKey+'End', 'End', clRed);

        with Dataset do
        begin
            if Locate('o_deptaddressno',DeptKey,[]) then
            begin

                While (FieldByName('o_deptaddressno').AsString = DeptKey) and not eof do
                begin

                    StartBar.AddXY(FieldByName('o_year').AsInteger,
                                                FieldByName('o_totalstart').AsInteger,
                                                FieldByName('o_year').AsString,
                                                StartBar.Color);


                   {when adding series per year for each department - the bars are not one after the other}
                    //TotalBar := GetInsertedBarSeries(DeptKey+'Total'+FieldByName('o_year').AsString, siLang.GetTextOrDefault('IDS_TOTAL'), clBlue);

                    TotalBar.AddXY(FieldByName('o_year').AsInteger,
                                                    FieldByName('o_total').AsInteger,
                                                    FieldByName('o_year').AsString,
                                                    TotalBar.Color);

                    TotalBar.Title := FieldByName('o_total').AsString + ': '+ FDeptList.Names[Loop];
                    TotalBar.Marks.Style := smsSeriesTitle;
                    TotalBar.Marks.ArrowLength := 50;
                    TotalBar.Marks.Callout.ArrowHead := ahSolid;


                    EndBar.AddXY(FieldByName('o_year').AsInteger,
                                                FieldByName('o_totalEnd').AsInteger,
                                                FieldByName('o_year').AsString,
                                                EndBar.Color);

                    Next;
                end;
            end;
        end;
    end;

    SetSeriesLegendProperties;
end;

function TFRDept.GetInsertedBarSeries(aName, aTitle: String;
  aColor: TColor): TBarSeries;
begin
    Result := TBarSeries.Create(Self);

    with Result do
    begin
        Name := 'Series' + aName;
        Title := aTitle;
        Color := aColor;
        Marks.Style := smsValue;
    end;

    Chart1.AddSeries(Result);
end;

我的代码生成了以下条，但蓝色条的值未在标记中获得适当的值。

实际上，我的目标是在每个系列的条形图（红色、绿色和蓝色）上方显示相应的部门。我什至选择了另一种方法，尝试用 'symbols on draw' 修改图例，但事件没有触发。是否有可能在带有复选框的样式 lsSeriesGroups 的图例中显示符号？然后我还可以设置 Totalbar :

Marks.Symbol.Visible :=  True;

Answer 1

使用以下代码对我来说效果很好：

uses Series;

procedure TForm1.FormCreate(Sender: TObject);
var i: Integer;
begin
  for i := 0 to 3 do
  begin
    Chart1.AddSeries(TBarSeries.Create(Self)).FillSampleValues();
    Chart1[i].Marks.Style:=smsValue;
    Chart1[i].Title:='Series'+IntToStr(i);
    Chart1[i].OnGetMarkText := Series1GetMarkText;
  end;
end;

procedure TForm1.Series1GetMarkText(Sender: TChartSeries;
  ValueIndex: Integer; var MarkText: String);
begin
  MarkText := MarkText + ' ' + Sender.Title;
end;

I even opted for an alternative way by trying to modify the legend with 'symbols on draw' but the event didn't trigger.

是你暗杀的吗？例如：

  Chart1.Legend.Symbol.OnDraw:=LegendDraw;

在 TeeChart 程序组的功能演示中 All Features\Welcome!\Miscellanoeus\Legend\Symbol OnDraw 中有一个完整的示例。

Is there a possibility to display the symbols in the legend of style lsSeriesGroups with checkboxes? Then I could also set the Totalbar :

恐怕这不受支持。请随时在 Steema Software's bugzilla 添加您的功能请求。上面的代码片段为我生成了这张图表：

TChart：获取带有系列标题的标记样式及其值

TChart : Get mark style with series title together with its value

teechart

delphi-xe2