Class PercentChangePeriodRTIndicator

java.lang.Object

com.wualabs.qtsurfer.engine.indicators.core.AbstractRTIndicator

com.wualabs.qtsurfer.engine.indicators.core.AbstractIncrementalRTIndicator

com.wualabs.qtsurfer.engine.indicators.core.AbstractDecorableIncrementalRTIndicator

com.wualabs.qtsurfer.engine.indicators.helpers.PercentChangePeriodRTIndicator

All Implemented Interfaces:

ClockAware, Resettable, RTIndicator

public class PercentChangePeriodRTIndicator
extends AbstractDecorableIncrementalRTIndicator

Calculates the percent change over periods tracked by a PeriodCounter indicator.

Constructor Summary

Constructors

Modifier	Constructor	Description
	PercentChangePeriodRTIndicator(PeriodCounterRTIndicator periodCounterRTIndicator)
<T extends RTIndicator & PeriodCounter>	PercentChangePeriodRTIndicator(T indicator)

Method Summary

Modifier and Type	Method	Description
double	getInitialValue()
double	getPercentChange()
long	getPeriodCount()
double	update(double newValue)	Computes the percent change relative to the initial value at the start of the current period sequence.

Methods inherited from class AbstractDecorableIncrementalRTIndicator

getIndicator, nextValue, reset, setClockSupplier

Methods inherited from class AbstractIncrementalRTIndicator

getLastUpdateValue, getPeriodCycles, getPeriods, getPrevValue, initValue, isPeriodic, isReady, prevNextValue, setPeriods, tickValue

Methods inherited from class AbstractRTIndicator

equals, getDisplayHint, getMeta, getValue, hashCode, hide, isPoison, setValue, toString, toString, withDisplayHint, withMeta

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface RTIndicator

getId, isHidden, ro, update, update

Constructor Details

PercentChangePeriodRTIndicator

public PercentChangePeriodRTIndicator(PeriodCounterRTIndicator periodCounterRTIndicator)

PercentChangePeriodRTIndicator

public <T extends RTIndicator & PeriodCounter> PercentChangePeriodRTIndicator(T indicator)

Method Details

getPeriodCount

public long getPeriodCount()

getInitialValue

public double getInitialValue()

getPercentChange

public double getPercentChange()

update

public double update(double newValue)

Computes the percent change relative to the initial value at the start of the current period sequence. When the period counter resets to zero, captures a new initial value and returns 0. Uses a default baseline of 100 when the initial value is zero to avoid division by zero. The stored value is the fractional change (multiply by 100 for percentage).

Specified by:

update in interface RTIndicator

Overrides:

update in class AbstractDecorableIncrementalRTIndicator

Parameters:

newValue - the new input value

Returns:

the fractional change relative to the period's initial value