YOUSEFUL / DELPHI / COMPONENTS

`TAtlasFinStudies`

The collection behind TAtlasFinPane.Studies: what a pane draws, in drawing order.

Class Unit Atlas.FinChart · Inherits TOwnedCollection · Product Atlas Fin

Description

An owned collection of TAtlasFinStudy items with the usual TCollection members (Count, Clear, Delete, BeginUpdate, EndUpdate). Any change repaints the chart.

Members

Member	Kind	What it does
`Add`	method	Appends a study of the given kind and returns it.
`Items`	property	The study at `Index`, in drawing order.

Properties

`Items` property

property Items[Index: Integer]: TAtlasFinStudy read GetItem; default;

The study at Index, in drawing order. Being the default property, Pane.Studies[0] is enough.

Chart.Panes[0].Studies[0].Kind := skCloseArea;

Methods

`Add` method

function Add(Kind: TAtlasStudyKind; Period: Integer = 0): TAtlasFinStudy;

Appends a study of the given kind and returns it. A Period of 0 takes the kind's default: 20 for SMA, EMA and Bollinger, 12 (the fast period) for MACD, 14 for RSI; the price and volume kinds ignore it. Any other period is validated like the Period property: outside 1..100000, or at 26 or more for MACD, raises EAtlasFinError, and the new item is removed again.

Pane.Studies.Add(skSMA);        // SMA(20)
Pane.Studies.Add(skEMA, 9);     // EMA(9)
Pane.Studies.Add(skRSI);        // RSI(14)

Examples

List the studies of a chart

Walks every pane and study and collects the captions the headers show.

uses System.Classes, Atlas.FinChart;

procedure ListStudies(Chart: TAtlasFinChart; Target: TStrings);
var
  I, J: Integer;
begin
  for I := 0 to Chart.Panes.Count - 1 do
    for J := 0 to Chart.Panes[I].Studies.Count - 1 do
      Target.Add(Chart.Panes[I].Title + ': ' + Chart.Panes[I].Studies[J].Caption);
end;

TAtlasFinStudy · TAtlasFinPane

Also in Atlas Fin

TAtlasFinChart

TAtlasFinStudies