TdxChartSimpleSeries Class

A series in a simple diagram.

Declaration

TdxChartSimpleSeries = class(
    TdxChartCustomSeries
)

Remarks

Simple series display values as portions of a shape, such as a pie or doughnut. Simple series are useful when you need to compare percentage values of different point arguments in the same series.

Supported Simple Series Views

A series View determines how a simple 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.

Pie View

The Pie View displays series values as slices of a circle whose radial angles reflect shares of all series values in relation to their total.

Doughnut View

The Doughnut View is identical to the Pie View but has a hole in its center.

Main API Members

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

Appearance and Behavior Settings

Caption | Title

Specify series caption and title.

CheckableInLegend

Specifies if users can hide or display the XY series in the chart legend.

EmptyPointsDisplayMode

Specifies how the Chart control displays empty points in the series.

Index

Specifies the index of the series in its diagram.

StoredName

Specifies the custom name for saving series data to a stream.

ViewClass | ViewType

Switch between available View types.

View

Provides access to the active series View settings.

Data-Related Settings

DataBindingClass | DataBindingType

Switch between data access modes.

DataBinding

Provides access to data binding settings.

Points

Provides access to the series point collection.

SortBy | SortOrder

Sort data points by values or arguments in ascending or descending order.

TopNOptions

Specifies how the simple series determines the top N points and displays them.

General-Purpose API Members

AssignFrom

Updates all series settings from the specified source.

BeginUpdate | EndUpdate | CancelUpdate

Allow you to avoid excessive redraw operations during batch data and appearance changes.

Diagram

Specifies the diagram to which the series belongs.

Code Example

The following code example creates a simple series with the Doughnut View and populates it with data points in unbound mode:

Delphi

uses cxDataStorage;  // This unit declares the TcxStringValueType class
// ...
var
  ASimpleDiagram: TdxChartSimpleDiagram;
  ASimpleSeries: TdxChartSimpleSeries;
  ADoughnutView: TdxChartSimpleSeriesDoughnutView;
  ADataBinding: TdxChartSimpleSeriesUnboundDataBinding;
begin
  dxChartControl1.BeginUpdate;  // Initiates the following batch change
  try
    ASimpleDiagram := dxChartControl1.AddDiagram<TdxChartSimpleDiagram>('Country statistics');
    ASimpleDiagram.Title.Appearance.FontOptions.Size := 16;
    ASimpleDiagram.Legend.AlignmentHorz := TdxChartLegendAlignment.Near; // Moves the legend pane
    ASimpleSeries := ASimpleDiagram.AddSeries('Area');  // Creates a simple series
    // Displays series data point arguments on the diagram legend pane
    ASimpleSeries.ShowInLegend := TdxChartSeriesShowInLegend.Diagram;
    ASimpleSeries.ViewClass := TdxChartSimpleSeriesDoughnutView;  // Selects the Doughnut series View
    // Selects the unbound data access mode
    ASimpleSeries.DataBindingClass := TdxChartSimpleSeriesUnboundDataBinding;
    ADataBinding := ASimpleSeries.DataBinding as TdxChartSimpleSeriesUnboundDataBinding;
    ADataBinding.ArgumentField.ValueTypeClass := TcxStringValueType;  // Selects the string data type
    ASimpleSeries.Title.Text := 'Area';  // Specifies the series title
    // Populates the unbound simple series with data points
    ASimpleSeries.Points.Add('Russia', 17.0752);
    ASimpleSeries.Points.Add('Canada', 9.98467);
    ASimpleSeries.Points.Add('USA', 9.63142);
    ASimpleSeries.Points.Add('China', 9.59696);
    ASimpleSeries.Points.Add('Brazil', 8.511965);
    ASimpleSeries.Points.Add('Australia', 7.68685);
    ASimpleSeries.Points.Add('India', 3.28759);
    ASimpleSeries.Points.Add('Others', 81.2);
    // Customizes appearance of the Doughnut series View
    ADoughnutView := ASimpleSeries.View as TdxChartSimpleSeriesDoughnutView;
    ADoughnutView.HoleRadius := 50;
    ADoughnutView.ExplodedValueOptions.Mode := TdxChartExplodedValueMode.All;
  finally
    dxChartControl1.EndUpdate;  // Calls EndUpdate regardless of the batch operation's success
  end;

C++

#include "cxDataStorage.hpp"  // This header declares the TcxStringValueType class
// ...
  TdxChartSimpleDiagram *ASimpleDiagram;
  TdxChartSimpleSeries *ASimpleSeries;
  TdxChartSimpleSeriesDoughnutView *ADoughnutView;
  TdxChartSimpleSeriesUnboundDataBinding *ADataBinding;
  // ...
  dxChartControl1->BeginUpdate();  // Initiates the following batch change
  try
  {
    ASimpleDiagram = new TdxChartSimpleDiagram(dxChartControl1->Owner);
    ASimpleDiagram->SetParentComponent(dxChartControl1);
    ASimpleDiagram->Title->Text = "Country Statistics";
    ASimpleDiagram->Title->Appearance->FontOptions->Size = 16;
    ASimpleDiagram->Legend->AlignmentHorz = TdxChartLegendAlignment::Near; // Moves the legend pane
    ASimpleSeries = ASimpleDiagram->AddSeries("Area");  // Creates a simple series
    // Displays series data point arguments on the diagram legend pane
    ASimpleSeries->ShowInLegend = TdxChartSeriesShowInLegend::Diagram;
    // Selects the Doughnut series View
    ASimpleSeries->ViewClass = __classid(TdxChartSimpleSeriesDoughnutView);
    // Selects the unbound data access mode
    ASimpleSeries->DataBindingClass = __classid(TdxChartSimpleSeriesUnboundDataBinding);
    ADataBinding = dynamic_cast<TdxChartSimpleSeriesUnboundDataBinding*>(ASimpleSeries->DataBinding);
    ADataBinding->ArgumentField->ValueTypeClass = TcxStringValueType;  // Selects the string data type
    ASimpleSeries->Title->Text = "Area";  // Specifies the series title
    // Populates the unbound simple series with data points
    ASimpleSeries->Points->Add("Russia", 17.0752);
    ASimpleSeries->Points->Add("Canada", 9.98467);
    ASimpleSeries->Points->Add("USA", 9.63142);
    ASimpleSeries->Points->Add("China", 9.59696);
    ASimpleSeries->Points->Add("Brazil", 8.511965);
    ASimpleSeries->Points->Add("Australia", 7.68685);
    ASimpleSeries->Points->Add("India", 3.28759);
    ASimpleSeries->Points->Add("Others", 81.2);
    // Customizes appearance of the Doughnut series View
    ADoughnutView = dynamic_cast<TdxChartSimpleSeriesDoughnutView*>(ASimpleSeries->View);
    ADoughnutView->HoleRadius = 50;
    ADoughnutView->ExplodedValueOptions->Mode = TdxChartExplodedValueMode::All;
  }
  __finally
    dxChartControl1->EndUpdate(); // Calls EndUpdate regardless of the batch operation's success
  // ...

Related Compiled Demo

To see a simple series in action, run the Chart Control demo in the VCL Demo Center installed with compiled VCL DevExpress demos. Select Pie or Doughnut in the left sidebar.

Download: Compiled VCL Demos

Tip

You can find full source code for the installed compiled Chart control demo in the following folder:

%PUBLIC%\Documents\DevExpress VCL Demos\MegaDemos\Product Demos\ExpressChart

Direct TdxChartSimpleSeries Class References

A simple diagram’s Series and VisibleSeries properties reference a TdxChartSimpleSeries object.

Inheritance

TObject

TPersistent

TComponent

TcxLockableComponent

TdxChartCustomSeries

TdxChartSimpleSeries

Footnotes

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