Class RateChangeRTIndicator

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.RateChangeRTIndicator

All Implemented Interfaces:

ClockAware, Resettable, RTIndicator

public class RateChangeRTIndicator
extends AbstractDecorableIncrementalRTIndicator

Gets the rate of change of an RTIndicator between updates

Field Summary

Fields

Modifier and Type	Field	Description
static final String	ID	Canonical catalog id, set as an explicit IndicatorMeta.ID override where getId() class-name derivation would be wrong.

Constructor Summary

Constructors

Constructor	Description
RateChangeRTIndicator(RTIndicator indicator)

Method Summary

Modifier and Type	Method	Description
protected double	getPrevValue()
protected double	initValue(double initValue)	Non periodic init value
protected double	nextValue(double prevValue, double newValue)	Computes the rate of change as (newValue - prevValue) / |prevValue|.

Methods inherited from class AbstractDecorableIncrementalRTIndicator

getIndicator, reset, setClockSupplier, update

Methods inherited from class AbstractIncrementalRTIndicator

getLastUpdateValue, getPeriodCycles, getPeriods, 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

Field Details

ID

public static final String ID

Canonical catalog id, set as an explicit IndicatorMeta.ID override where getId() class-name derivation would be wrong.

See Also:

• Constant Field Values

Constructor Details

RateChangeRTIndicator

public RateChangeRTIndicator(RTIndicator indicator)

Method Details

initValue

protected double initValue(double initValue)

Description copied from class: AbstractIncrementalRTIndicator

Non periodic init value

Overrides:

initValue in class AbstractIncrementalRTIndicator

Parameters:

initValue -

Returns:

getPrevValue

protected double getPrevValue()

Overrides:

getPrevValue in class AbstractIncrementalRTIndicator

nextValue

protected double nextValue(double prevValue,
 double newValue)

Computes the rate of change as (newValue - prevValue) / |prevValue|. Uses the absolute value of prevValue in the denominator to handle negative base values correctly. Returns 0 when prevValue is zero to avoid division by zero.

Overrides:

nextValue in class AbstractDecorableIncrementalRTIndicator

Parameters:

prevValue - the previous raw input value

newValue - the current raw input value

Returns:

the fractional rate of change