Candlestick Patterns
Three Line Strike
Introduction
Create a new Three Line Strike candlestick pattern to indicate the pattern's presence.
To view the implementation of this candlestick pattern, see the LEAN GitHub repository.
Using ThreeLineStrike Indicator
To create an automatic indicators for ThreeLineStrike
, call the ThreeLineStrike
helper method from the QCAlgorithm
class. The ThreeLineStrike
method creates a ThreeLineStrike
object, hooks it up for automatic updates, and returns it so you can used it in your algorithm. In most cases, you should call the helper method in the Initialize
initialize
method.
public class ThreeLineStrikeAlgorithm : QCAlgorithm { private Symbol _symbol; private ThreeLineStrike _threelinestrike; public override void Initialize() { _symbol = AddEquity("SPY", Resolution.Daily).Symbol; _threelinestrike = CandlestickPatterns.ThreeLineStrike(_symbol); } public override void OnData(Slice data) { if (_threelinestrike.IsReady) { // The current value of _threelinestrike is represented by itself (_threelinestrike) // or _threelinestrike.Current.Value Plot("ThreeLineStrike", "threelinestrike", _threelinestrike); } } }
class ThreeLineStrikeAlgorithm(QCAlgorithm): def initialize(self) -> None: self._symbol = self.add_equity("SPY", Resolution.DAILY).symbol self._three_line_strike = self.CandlestickPatterns.three_line_strike(self._symbol) def on_data(self, slice: Slice) -> None: if self._three_line_strike.is_ready: # The current value of self._three_line_strike is represented by self._three_line_strike.current.value self.plot("ThreeLineStrike", "three_line_strike", self._three_line_strike.current.value)
The following reference table describes the ThreeLineStrike
method:
three_line_strike(symbol, resolution=None, selector=None)
Creates a new ThreeLineStrike pattern indicator. The indicator will be automatically updated on the given resolution.
- symbol (Symbol)
- resolution (Resolution, optional)
- selector (Callable[IBaseData, IBaseDataBar], optional)
ThreeLineStrike(symbol, resolution=None, selector=None)
Creates a new ThreeLineStrike pattern indicator. The indicator will be automatically updated on the given resolution.
- symbol (Symbol)
- resolution (Resolution, optional)
- selector (Func<IBaseData, IBaseDataBar>, optional)
If you don't provide a resolution, it defaults to the security resolution. If you provide a resolution, it must be greater than or equal to the resolution of the security. For instance, if you subscribe to hourly data for a security, you should update its indicator with data that spans 1 hour or longer.
For more information about the selector argument, see Alternative Price Fields.
For more information about plotting indicators, see Plotting Indicators.
You can manually create a ThreeLineStrike
indicator, so it doesn't automatically update. Manual indicators let you update their values with any data you choose.
Updating your indicator manually enables you to control when the indicator is updated and what data you use to update it. To manually update the indicator, call the Update
update
method with a TradeBar
. The indicator will only be ready after you prime it with enough data.
public class ThreeLineStrikeAlgorithm : QCAlgorithm { private Symbol _symbol; private ThreeLineStrike _threelinestrike; public override void Initialize() { _symbol = AddEquity("SPY", Resolution.Daily).Symbol; _threelinestrike = new ThreeLineStrike(); } public override void OnData(Slice data) { if (data.Bars.TryGetValue(_symbol, out var bar)) { _threelinestrike.Update(bar); } if (_threelinestrike.IsReady) { // The current value of _threelinestrike is represented by itself (_threelinestrike) // or _threelinestrike.Current.Value Plot("ThreeLineStrike", "threelinestrike", _threelinestrike); } } }
class ThreeLineStrikeAlgorithm(QCAlgorithm): def initialize(self) -> None: self._symbol = self.add_equity("SPY", Resolution.DAILY).symbol self._three_line_strike = ThreeLineStrike() def on_data(self, slice: Slice) -> None: bar = slice.bars.get(self._symbol) if bar: self._three_line_strike.update(bar) if self._three_line_strike.is_ready: # The current value of self._three_line_strike is represented by self._three_line_strike.current.value self.plot("ThreeLineStrike", "three_line_strike", self._three_line_strike.current.value)
To register a manual indicator for automatic updates with the security data, call the RegisterIndicator
register_indicator
method.
public class ThreeLineStrikeAlgorithm : QCAlgorithm { private Symbol _symbol; private ThreeLineStrike _threelinestrike; public override void Initialize() { _symbol = AddEquity("SPY", Resolution.Daily).Symbol; _threelinestrike = new ThreeLineStrike(); RegisterIndicator(_symbol, _threelinestrike, Resolution.Daily); } public override void OnData(Slice data) { if (_threelinestrike.IsReady) { // The current value of _threelinestrike is represented by itself (_threelinestrike) // or _threelinestrike.Current.Value Plot("ThreeLineStrike", "threelinestrike", _threelinestrike); } } }
class ThreeLineStrikeAlgorithm(QCAlgorithm): def initialize(self) -> None: self._symbol = self.add_equity("SPY", Resolution.DAILY).symbol self._three_line_strike = ThreeLineStrike() self.register_indicator(self._symbol, self._three_line_strike, Resolution.DAILY) def on_data(self, slice: Slice) -> None: if self._three_line_strike.is_ready: # The current value of self._three_line_strike is represented by self._three_line_strike.current.value self.plot("ThreeLineStrike", "three_line_strike", self._three_line_strike.current.value)
The following reference table describes the ThreeLineStrike
constructor:
ThreeLineStrike
Three Line Strike candlestick pattern
get_enumerator()
Returns an enumerator that iterates through the history window.
IEnumerator[IndicatorDataPoint]
reset()
Resets this indicator to its initial state
to_detailed_string()
Provides a more detailed string of this indicator in the form of {Name} - {Value}
str
update(time, value)
Updates the state of this indicator with the given value and returns true if this indicator is ready, false otherwise
- time (datetime)
- value (float)
bool
update(input)
Updates the state of this indicator with the given value and returns true if this indicator is ready, false otherwise
- input (IBaseData)
bool
consolidators
The data consolidators associated with this indicator if any
The data consolidators associated with this indicator if any
ISet[IDataConsolidator]
current
Gets the current state of this indicator. If the state has not been updated then the time on the value will equal DateTime.MinValue.
Gets the current state of this indicator. If the state has not been updated then the time on the value will equal DateTime.MinValue.
IndicatorDataPoint
is_ready
Gets a flag indicating when this indicator is ready and fully initialized
Gets a flag indicating when this indicator is ready and fully initialized
bool
item
Indexes the history windows, where index 0 is the most recent indicator value. If index is greater or equal than the current count, it returns null. If the index is greater or equal than the window size, it returns null and resizes the windows to i + 1.
Indexes the history windows, where index 0 is the most recent indicator value. If index is greater or equal than the current count, it returns null. If the index is greater or equal than the window size, it returns null and resizes the windows to i + 1.
IndicatorDataPoint
name
Gets a name for this indicator
Gets a name for this indicator
str
period
Gets the period of this window indicator
Gets the period of this window indicator
int
previous
Gets the previous state of this indicator. If the state has not been updated then the time on the value will equal DateTime.MinValue.
Gets the previous state of this indicator. If the state has not been updated then the time on the value will equal DateTime.MinValue.
IndicatorDataPoint
samples
Gets the number of samples processed by this indicator
Gets the number of samples processed by this indicator
int
warm_up_period
Required period, in data points, to the indicator to be ready and fully initialized
Required period, in data points, to the indicator to be ready and fully initialized
int
window
A rolling window keeping a history of the indicator values of a given period
A rolling window keeping a history of the indicator values of a given period
RollingWindow[IndicatorDataPoint]
ThreeLineStrike
Three Line Strike candlestick pattern
GetEnumerator()
Returns an enumerator that iterates through the history window.
IEnumerator[IndicatorDataPoint]
Reset()
Resets this indicator to its initial state
ToDetailedString()
Provides a more detailed string of this indicator in the form of {Name} - {Value}
String
Update(time, value)
Updates the state of this indicator with the given value and returns true if this indicator is ready, false otherwise
- time (DateTime)
- value (decimal)
Boolean
Update(input)
Updates the state of this indicator with the given value and returns true if this indicator is ready, false otherwise
- input (IBaseData)
Boolean
Consolidators
The data consolidators associated with this indicator if any
The data consolidators associated with this indicator if any
ISet<IDataConsolidator>
Current
Gets the current state of this indicator. If the state has not been updated then the time on the value will equal DateTime.MinValue.
Gets the current state of this indicator. If the state has not been updated then the time on the value will equal DateTime.MinValue.
IndicatorDataPoint
IsReady
Gets a flag indicating when this indicator is ready and fully initialized
Gets a flag indicating when this indicator is ready and fully initialized
bool
Name
Gets a name for this indicator
Gets a name for this indicator
string
Period
Gets the period of this window indicator
Gets the period of this window indicator
Int32
Previous
Gets the previous state of this indicator. If the state has not been updated then the time on the value will equal DateTime.MinValue.
Gets the previous state of this indicator. If the state has not been updated then the time on the value will equal DateTime.MinValue.
IndicatorDataPoint
Samples
Gets the number of samples processed by this indicator
Gets the number of samples processed by this indicator
int
WarmUpPeriod
Required period, in data points, to the indicator to be ready and fully initialized
Required period, in data points, to the indicator to be ready and fully initialized
Int32
Window
A rolling window keeping a history of the indicator values of a given period
A rolling window keeping a history of the indicator values of a given period
RollingWindow<IndicatorDataPoint>
[System.Int32]
Indexes the history windows, where index 0 is the most recent indicator value. If index is greater or equal than the current count, it returns null. If the index is greater or equal than the window size, it returns null and resizes the windows to i + 1.
Indexes the history windows, where index 0 is the most recent indicator value. If index is greater or equal than the current count, it returns null. If the index is greater or equal than the window size, it returns null and resizes the windows to i + 1.
IndicatorDataPoint
Indicator History
To get the historical data of the ThreeLineStrike
indicator, call the IndicatorHistory
self.indicator_history
method.
This method resets your indicator, makes a history request, and updates the indicator with the historical data.
Just like with regular history requests, the IndicatorHistory
indicator_history
method supports time periods based on a trailing number of bars, a trailing period of time, or a defined period of time.
If you don't provide a resolution
argument, it defaults to match the resolution of the security subscription.
public class ThreeLineStrikeAlgorithm : QCAlgorithm { private Symbol _symbol; public override void Initialize() { _symbol = AddEquity("SPY", Resolution.Daily).Symbol; var threelinestrike = CandlestickPatterns.ThreeLineStrike(_symbol); var countIndicatorHistory = IndicatorHistory(threelinestrike, _symbol, 100, Resolution.Minute); var timeSpanIndicatorHistory = IndicatorHistory(threelinestrike, _symbol, TimeSpan.FromDays(10), Resolution.Minute); var timePeriodIndicatorHistory = IndicatorHistory(threelinestrike, _symbol, new DateTime(2024, 7, 1), new DateTime(2024, 7, 5), Resolution.Minute); } }
class ThreeLineStrikeAlgorithm(QCAlgorithm): def initialize(self) -> None: self._symbol = self.add_equity("SPY", Resolution.DAILY).symbol three_line_strike = self.CandlestickPatterns.three_line_strike(self._symbol) count_indicator_history = self.indicator_history(three_line_strike, self._symbol, 100, Resolution.MINUTE) timedelta_indicator_history = self.indicator_history(three_line_strike, self._symbol, timedelta(days=10), Resolution.MINUTE) time_period_indicator_history = self.indicator_history(three_line_strike, self._symbol, datetime(2024, 7, 1), datetime(2024, 7, 5), Resolution.MINUTE)
To make the IndicatorHistory
indicator_history
method update the indicator with an alternative price field instead of the close (or mid-price) of each bar, pass a selector
argument.
var indicatorHistory = IndicatorHistory(threelinestrike, 100, Resolution.Minute, (bar) => ((TradeBar)bar).High);
indicator_history = self.indicator_history(three_line_strike, 100, Resolution.MINUTE, lambda bar: bar.high) indicator_history_df = indicator_history.data_frame
If you already have a list of Slice objects, you can pass them to the IndicatorHistory
indicator_history
method to avoid the internal history request.
var history = History(_symbol, 100, Resolution.Minute); var historyIndicatorHistory = IndicatorHistory(threelinestrike, history);