TdxChartXYSeries Class

A series in an XY diagram.

Declaration

TdxChartXYSeries = class(
    TdxChartCustomSeries
)

Remarks

An XY series is a set of data points displayed in a diagram using the axis of arguments (X-axis) and the axis of values (Y-axis) that form a two-dimensional Cartesian coordinate system.

Supported XY Series Views

A series View determines how an XY diagram displays series.^[1] A diagram can display multiple series with different Views and individual View appearance settings. You can use the ViewType or ViewClass property to switch between compatible Views in any existing series and display the same data in a different manner at any time.

Area Views

Area Views display series as filled areas on a diagram. Heights of peaks and hollows of filled areas reflect series point values. Area Views support the same line appearance settings for filled area borders as Line Views.

Simple Area View

The Simple Area View displays series as filled overlapping areas on a diagram. Use this View when you display only one series or when you need to compare multiple series.

Stacked Area View

The Stacked (Aggregated) Area View displays series as stacked areas on a diagram. Use this View when you display multiple series and you need to emphasize the total.

Full-Stacked Area View

The Full-Stacked (100% Stacked) Area View displays series as stacked areas on a diagram. Unlike the Stacked Area View, stacked areas always occupy an entire diagram area by height, and the axis of values displays percentage values. Use this View when you display multiple series and you need to emphasize percentage contribution of each series.

Bar Views

Bar Views display series as sets of vertical or horizontal bars depending on axes positions. Bar lengths reflect series point values. Bar Views are often used to compare values in different categories.

Simple Bar View

The Simple Bar View displays series values as colored bars grouped by argument values (categories). Use this View when you display only one series or when you need to compare multiple series.

Stacked Bar View

The Stacked Bar View displays all points from all series as colored bars stacked at argument values. Use this View when you display multiple series and you need to emphasize the total.

Full-Stacked Bar View

The Full-Stacked (100% Stacked) Bar View displays all series as colored bars stacked at argument values. Use this View when you display multiple series and you need to emphasize percentage contribution of each series.

Line Views

Line Views display series values as lines and/or points in any combination. Line Views are often used to show and compare multiple trends on the same diagram.

Simple Line View

The Simple Line View displays series as colored lines on a diagram. Use this View when you display only one series or when you need to compare multiple series.

Stacked Line View

The Stacked (Aggregated) Line View forms stacked empty areas from series lines on a diagram. Use this View when you display multiple series and you need to emphasize the total.

Full-Stacked Line View

The Full-Stacked (100% Stacked) Line View divides an entire diagram area by height with series lines so all values of a series are stacked with the corresponding values of other series on the same diagram. Use this View when you display multiple series and you need to emphasize percentage contribution of each series.

Main API Members

The list below outlines key members of the TdxChartXYSeries class that allow you to configure series.

• Specify the series caption and title (Caption and Title).
• Switch between data access modes (DataBindingClass and DataBindingType).
• Configure the connection between the series and its data source in any data access mode (DataBinding).
• Move the series between XY diagrams (Diagram).
• Specify if users can click the corresponding legend item check box to hide or display the series (CheckableInLegend).
• Determine how the Chart control displays empty data points in the series (EmptyPointsDisplayMode).
• Sort data points by values or arguments in ascending or descending order (SortBy and SortOrder).
• Change the Z-order of the series (Index).
• Access and manage series points (Points).
• Specify the custom name for saving series points to a stream (StoredName).
• Copy settings between XY series (AssignFrom).
• Avoid excessive redraw operations during batch data and appearance changes (BeginUpdate, CancelUpdate, and EndUpdate).
• Switch between available View types (ViewClass and ViewType).
• Customize appearance settings for the selected series View (View).

Code Examples

Bound Mode

The following code example creates three line series with identical appearance settings in bound mode:

Delphi

var
  AXYDiagram: TdxChartXYDiagram;
  AXYSeriesAmericas, AXYSeriesEurope, AXYSeriesAfrica: TdxChartXYSeries;
  ALineView: TdxChartXYSeriesLineView;
  ADataBinding: TdxChartXYSeriesDBDataBinding;
begin
  dxChartControl1.BeginUpdate;  // Initiates the following batch change
  try
    dxChartControl1.Titles.Add.Text := 'Historic, Current, and Future Population Projection';
    AXYDiagram := dxChartControl1.AddDiagram<TdxChartXYDiagram>;
    AXYDiagram.Axes.AxisY.Title.Text := 'Population mid-year, millions';
    AXYDiagram.Axes.AxisX.Interlaced := True;
    AXYSeriesEurope := AXYDiagram.AddSeries('Europe');  // Creates a new series with the caption "Europe"
    AXYSeriesEurope.ShowInLegend := TdxChartSeriesShowInLegend.Diagram;
    ADataBinding := AXYSeriesEurope.DataBinding as TdxChartXYSeriesDBDataBinding;
    ADataBinding.DataSource := dsPopulation;  // Assigns a data source
    ADataBinding.DataSource.DataSet := mdPopulation;  // Assigns a dataset
    ADataBinding.DataSource.DataSet.Active := True;  // Enables the assigned dataset
    ADataBinding.ArgumentField.FieldName := 'Year';  // Specifies the source dataset field for arguments
    ADataBinding.ValueField.FieldName := 'Europe';  // Specifies the source dataset field for values
    AXYSeriesEurope.ViewType := 'Line';  // Selects the Line series View
    ALineView := TdxChartXYSeriesLineView(AXYSeriesEurope.View);
    ALineView.Markers.Visible := True;  // Displays value markers
    ALineView.ValueLabels.Visible := True;  // Displays value labels
    ALineView.Appearance.StrokeOptions.Width := 2;  // Increases line width
    AXYSeriesAmericas := AXYDiagram.AddSeries;  // Creates a new series with the default settings
    AXYSeriesAmericas.AssignFrom(AXYSeriesEurope);  // Copies all settings from the "Europe" series
    AXYSeriesAmericas.Caption := 'Americas';  // Defines a different series caption
    // Specifies a different source dataset field for values
    TdxChartXYSeriesDBDataBinding(AXYSeriesAmericas).ValueField.FieldName := 'Americas';
    AXYSeriesAfrica := AXYDiagram.AddSeries;  // Creates a new series with the default settings
    AXYSeriesAfrica.AssignFrom(AXYSeriesEurope);  // Copies all settings from the "Europe" series
    AXYSeriesAfrica.Caption := 'Africa';  // Defines a different series caption
    // Specifies a different source dataset field for values
    TdxChartXYSeriesDBDataBinding(AXYSeriesAfrica).ValueField.FieldName := 'Africa';
  finally
    dxChartControl1.EndUpdate;  // Calls EndUpdate regardless of the batch operation's success
  end;
end;

C++

  TdxChartXYDiagram *AXYDiagram;
  TdxChartXYSeries *AXYSeriesEurope, *AXSeriesAmericas, *AXYSeriesAfrica;
  TdxChartXYSeriesLineView *ALineView;
  TdxChartXYSeriesDBDataBinding *ADataBinding;
  // ...
  dxChartControl1->BeginUpdate();  // Initiates the following batch change
  try
  {
    dxChartControl1->Titles->Add()->Text = "Historic, Current, and Future Population Projection";
    AXYDiagram = dxChartControl1->AddDiagram<TdxChartXYDiagram>();
    AXYDiagram->Axes->AxisY->Title->Text = "Population mid-year, millions";
    AXYDiagram->Axes->AxisX->Interlaced = true;
    AXYSeriesEurope = AXYDiagram->AddSeries("Europe"); // Creates a new series with the caption "Europe"
    AXYSeriesEurope->ShowInLegend = TdxChartSeriesShowInLegend::Diagram;
    ADataBinding = dynamic_cast<TdxChartXYSeriesDBDataBinding*>(AXYSeriesEurope->DataBinding);
    ADataBinding->DataSource = dsPopulation;  // Assigns a data source
    ADataBinding->DataSource->DataSet = mdPopulation; // Assigns a dataset
    ADataBinding->DataSource->DataSet->Active = true; // Enables the assigned dataset
    ADataBinding->ArgumentField->FieldName = "Year";  // Specifies the source dataset field for arguments
    ADataBinding->ValueField->FieldName = "Europe";  // Specifies the source dataset field for values
    AXYSeriesEurope->ViewType = "Line";  // Selects the Line series View
    ALineView := dynamic_cast<TdxChartXYSeriesLineView*>(AXYSeriesEurope->View);
    ALineView->Markers->Visible := true;  // Displays value markers
    ALineView->ValueLabels->Visible = true;  // Displays value labels
    ALineView->Appearance->StrokeOptions->Width = 2; // Increases line width
    AXYSeriesAmericas = AXYDiagram->AddSeries();  // Creates a new series with the default settings
    AXYSeriesAmericas->AssignFrom(AXYSeriesEurope);  // Copies all settings from the "Europe" series
    ADataBinding = dynamic_cast<TdxChartXYSeriesDBDataBinding*>(AXYSeriesAmericas->DataBinding);
    ADataBinding->ValueField->FieldName = "Americas"; // Specifies a different source dataset field for values
    AXYSeriesAmericas->Caption = "Americas";  // Defines a different series caption
    AXYSeriesAfrica = AXYDiagram->AddSeries();  // Creates a new series with the default settings
    AXYSeriesAfrica->AssignFrom(AXYSeriesEurope);  // Copies all settings from the "Europe" series
    ADataBinding = dynamic_cast<TdxChartXYSeriesDBDataBinding*>(AXYSeriesAfrica->DataBinding);
    ADataBinding->ValueField->FieldName = "Africa";  // Specifies a different source dataset field for values
    AXYSeriesAfrica->Caption = "Africa";  // Defines a different series caption
  }
  __finally
    dxChartControl1->EndUpdate(); // Calls EndUpdate regardless of the batch operation's success
  // ...

Unbound Mode

The following code example creates three stacked bar series with identical appearance settings in unbound data access mode:

Delphi

var
  AXYDiagram: TdxChartXYDiagram;
  AXY2018Series, AXY2019Series, AXY2020Series: TdxChartXYSeries;
  AStackedBarView: TdxChartXYSeriesStackedBarView;
begin
  dxChartControl1.BeginUpdate;  // Initiates the following batch change
  try
    AXYDiagram := dxChartControl1.AddDiagram<TdxChartXYDiagram>('DevAV Sales By Region');
    AXYDiagram.Title.Appearance.FontOptions.Size := 20;
    AXYDiagram.Axes.AxisY.Title.Text := 'Millions of Dollars';
    AXYDiagram.Axes.AxisY.Title.Appearance.FontOptions.Size := 14;
    AXY2018Series := AXYDiagram.AddSeries('2018');  // Creates a new series with the caption "2018"
    AXY2018Series.DataBindingType := 'Unbound';  // Selects the unbound data access mode
    // Changes the argument field type to "string"
    TdxChartXYSeriesUnboundDataBinding(AXY2018Series.DataBinding).ArgumentField.ValueType := 'string';
    AXY2018Series.ViewType := 'StackedBar';  // Selects the Stacked Bar series View
    AStackedBarView := AXY2018Series.View as TdxChartXYSeriesStackedBarView;
    AStackedBarView.ValueLabels.Visible := True;  // Displays value labels on bars
    AStackedBarView.ValueLabels.NumberFormat := '0.000';  // Changes the number display format
    AStackedBarView.ValueLabels.Appearance.FontOptions.Bold := True;
    AXY2018Series.Points.Add('Asia', 4.2372);
    AXY2018Series.Points.Add('Australia', 1.7871);
    AXY2018Series.Points.Add('Europe', 3.0884);
    AXY2018Series.Points.Add('North America', 3.4855);
    AXY2018Series.Points.Add('South America', 1.6027);
    AXY2019Series := AXYDiagram.AddSeries;  // Creates a new series with the default settings
    AXY2019Series.AssignFrom(AXY2018Series);  // Copies all settings from the "2018" series
    AXY2019Series.Caption := '2019';  // Defines a different series caption
    AXY2019Series.Points.Add('Asia', 4.7685);
    AXY2019Series.Points.Add('Australia', 1.9576);
    AXY2019Series.Points.Add('Europe', 3.3579);
    AXY2019Series.Points.Add('North America', 3.7477);
    AXY2019Series.Points.Add('South America', 1.8237);
    AXY2020Series := AXYDiagram.AddSeries('2020');  // Creates a new series with the default settings
    AXY2020Series.AssignFrom(AXY2018Series);  // Copies all settings from the "2018" series
    AXY2020Series.Caption := '2020';  // Defines a different series caption
    AXY2020Series.Points.Add('Asia', 5.289);
    AXY2020Series.Points.Add('Australia', 2.2727);
    AXY2020Series.Points.Add('Europe', 3.7257);
    AXY2020Series.Points.Add('North America', 4.1825);
    AXY2020Series.Points.Add('South America', 2.1172);
  finally
    dxChartControl1.EndUpdate;  // Calls EndUpdate regardless of the batch operation's success
  end;
end;

C++

  TdxChartXYDiagram *AXYDiagram;
  TdxChartXYSeries *AXY2018Series, *AXY2019Series, *AXY2020Series;
  TdxChartXYSeriesStackedBarView *AStackedBarView;
  TdxChartXYSeriesUnboundDataBinding *ADataBinding;
  // ...
  dxChartControl1->BeginUpdate();  // Initiates the following batch change
  try
  {
    AXYDiagram = dxChartControl1->AddDiagram<TdxChartXYDiagram>("DevAV Sales by Region");
    AXYDiagram->Title->Appearance->FontOptions->Size = 20;
    AXYDiagram->Axes->AxisY->Title->Text = "Millions of Dollars";
    AXYDiagram->Axes->AxisY->Title->Appearance->FontOptions->Size = 14;
    AXYSeries = AXYDiagram->AddSeries("2018"); // Creates a new series with the caption "2018"
    AXYSeries->DataBindingType = "Unbound";  // Selects the unbound data access mode
    ADataBinding = dynamic_cast<TdxChartXYSeriesUnboundDataBinding*>(AXY2018Series->DataBinding);
    ADataBinding->ArgumentField->ValueType = "string"; // Changes the argument field type to "string"
    AXYSeries->ViewType = "StackedBar";  // Selects the Stacked Bar series View
    AStackedBarView = dynamic_cast<TdxChartXYSeriesStackedBarView*>(AXY2018Series->View);
    AStackedBarView->ValueLabels->Visible = true; // Displays value labels on bars
    AStackedBarView->ValueLabels->NumberFormat = "0.000"; // Changes the number display format
    AStackedBarView->ValueLabels->Appearance->FontOptions->Bold = true;
    AXY2018Series->Points->Add("Asia", 4.2372);
    AXY2018Series->Points->Add("Australia", 1.7871);
    AXY2018Series->Points->Add("Europe", 3.0884);
    AXY2018Series->Points->Add("North America", 3.4855);
    AXY2018Series->Points->Add("South America", 1.6027);
    AXY2019Series = AXYDiagram->AddSeries();  // Creates a new series with the default settings
    AXY2019Series->AssignFrom(AXY2018Series); // Copies all settings from the "2018" series
    AXY2019Series->Caption = "2019"; // Defines a different series caption
    AXY2019Series->Points->Add("Asia", 4.7685);
    AXY2019Series->Points->Add("Australia", 1.9576);
    AXY2019Series->Points->Add("Europe", 3.3579);
    AXY2019Series->Points->Add("North America", 3.7477);
    AXY2019Series->Points->Add("South America", 1.8237);
    AXY2020Series = AXYDiagram->AddSeries();  // Creates a new series with the default settings
    AXY2020Series->AssignFrom(XY2018Series); // Copies all settings from the "2018" series
    AXY2020Series->Caption = "2020";  // Defines a different series caption
    AXY2020Series->Points->Add("Asia", 5.289);
    AXY2020Series->Points->Add("Australia", 2.2727);
    AXY2020Series->Points->Add("Europe", 3.7257);
    AXY2020Series->Points->Add("North America", 4.1825);
    AXY2020Series->Points->Add("South America", 2.1172);
  }
  __finally
    dxChartControl1->EndUpdate(); // Calls EndUpdate regardless of the batch operation's success
  // ...

Delete a Series

To delete all series in a diagram, call its DeleteAllSeries procedure. To delete an individual series, release it directly in code (call the Free procedure in Delphi or use the delete keyword in C++Builder).

Direct TdxChartXYSeries Class References

An XY diagram’s Series property references a TdxChartXYSeries object.

Inheritance

TObject

TPersistent

TComponent

TcxLockableComponent

TdxChartCustomSeries

TdxChartXYSeries

Footnotes

1. All example images in this topic section demonstrate the same series when different Views are active for comparison.