com.dukascopy.indicators

Class HeikinAshiIndicator

java.lang.Object

com.dukascopy.indicators.HeikinAshiIndicator

All Implemented Interfaces:

IDrawingIndicator, IIndicator, IMinMax

public class HeikinAshiIndicator
extends java.lang.Object
implements IIndicator, IDrawingIndicator, IMinMax

NOTE: The calculate logic of this indicator is implemented in JavaScript. Please, update the corresponding JS code in case of updating of this class. Created by: S.Vishnyakov Date: Jul 23, 2009 Time: 11:48:57 AM

Field Summary

Fields

Modifier and Type	Field and Description
static int	CLOSE
static int	HIGH
static int	LOW
static int	OPEN

Constructor Summary

Constructors

Constructor and Description
HeikinAshiIndicator()

Method Summary

Modifier and Type	Method and Description
IndicatorResult	calculate(int startIndex, int endIndex) Calculates values of the indicator from startIndex to endIndex of input parameter and places them in output parameters
java.awt.Point	drawOutput(java.awt.Graphics g, int outputIdx, java.lang.Object values2, java.awt.Color color, java.awt.Stroke stroke, IIndicatorDrawingSupport drawingSupport, java.util.List<java.awt.Shape> indicatorPaths, java.util.Map<java.awt.Color,java.util.List<java.awt.Point>> indicatorHandlesPoints) This method will be called once for every output marked as drawnByIndicator every time the chart surface needs to be redrawn
IndicatorInfo	getIndicatorInfo() Returns object that describes indicator, how many inputs, outputs it has, where it should be shown etc
InputParameterInfo	getInputParameterInfo(int index) Returns object that describes one of the inputs
int	getLookback() Returns number of elements needed to calculate value of the first element.
int	getLookforward() Returns number of elements after last element needed to calculate value of the last element.
double[]	getMinMax(int outputIdx, java.lang.Object values, int firstVisibleValueIndex, int lastVisibleValueIndex) This method will be called once for every output.
OptInputParameterInfo	getOptInputParameterInfo(int index) Returns object that describes optional input
OutputParameterInfo	getOutputParameterInfo(int index) Returns object that describes output
void	onStart(IIndicatorContext context) Called on indicator initialization
void	setInputParameter(int index, java.lang.Object array) Sets input parameter.
void	setOptInputParameter(int index, java.lang.Object value) Sets optional input parameter.
void	setOutputParameter(int index, java.lang.Object array) Sets output parameter.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

OPEN

public static final int OPEN

See Also:

Constant Field Values

CLOSE

public static final int CLOSE

See Also:

Constant Field Values

HIGH

public static final int HIGH

See Also:

Constant Field Values

LOW

public static final int LOW

See Also:

Constant Field Values

Constructor Detail

HeikinAshiIndicator

public HeikinAshiIndicator()

Method Detail

onStart

public void onStart(IIndicatorContext context)

Description copied from interface: IIndicator

Called on indicator initialization

Specified by:

onStart in interface IIndicator

Parameters:

context - allows access to system functionality

calculate

public IndicatorResult calculate(int startIndex,
                                 int endIndex)

Description copied from interface: IIndicator

Calculates values of the indicator from startIndex to endIndex of input parameter and places them in output parameters

Specified by:

calculate in interface IIndicator

Parameters:

startIndex - index of the first element in input parameters that needs corresponding indicator value. That doesn't mean that values before startIndex will not be read, they will be if lookback is more than 0. That also doesn't mean that value for startIndex will be calculated, it will be not if startIndex < lookback. IndicatorResult.getFirstValueIndex() returns index of the first element that has corresponding calculated value in output array(s)

endIndex - index of the last element in input parameters that needs corresponding indicator value

Returns:

object with first index in input that has calculated value and number of values calculated

getIndicatorInfo

public IndicatorInfo getIndicatorInfo()

Description copied from interface: IIndicator

Returns object that describes indicator, how many inputs, outputs it has, where it should be shown etc

Specified by:

getIndicatorInfo in interface IIndicator

Returns:

object that describes indicator

getInputParameterInfo

public InputParameterInfo getInputParameterInfo(int index)

Description copied from interface: IIndicator

Returns object that describes one of the inputs

Specified by:

getInputParameterInfo in interface IIndicator

Parameters:

index - index of the input

Returns:

object that describes input

getOptInputParameterInfo

public OptInputParameterInfo getOptInputParameterInfo(int index)

Description copied from interface: IIndicator

Returns object that describes optional input

Specified by:

getOptInputParameterInfo in interface IIndicator

Parameters:

index - index of the optional input

Returns:

object that describes optional input

getOutputParameterInfo

public OutputParameterInfo getOutputParameterInfo(int index)

Description copied from interface: IIndicator

Returns object that describes output

Specified by:

getOutputParameterInfo in interface IIndicator

Parameters:

index - index of the output

Returns:

object that describes output

setInputParameter

public void setInputParameter(int index,
                              java.lang.Object array)

Description copied from interface: IIndicator

Sets input parameter. Array parameter is an array of the doubles, ints or prices represented as double[][]. Prices is in following order: open, close, high, low, volume

Specified by:

setInputParameter in interface IIndicator

Parameters:

index - index of the parameter

array - array of the doubles, ints or prices represented as double[][]

setOptInputParameter

public void setOptInputParameter(int index,
                                 java.lang.Object value)

Description copied from interface: IIndicator

Sets optional input parameter. If one of the parameters not set, then default value should be used

Specified by:

setOptInputParameter in interface IIndicator

Parameters:

index - index of the parameter

value - int or double value

setOutputParameter

public void setOutputParameter(int index,
                               java.lang.Object array)

Description copied from interface: IIndicator

Sets output parameter. Size of the array should be enough to hold calculated values requested with IIndicator.calculate(int, int) call

Specified by:

setOutputParameter in interface IIndicator

Parameters:

index - index of the parameter

array - array of doubles or ints enough to hold values from startIndex to endIndex

getLookback

public int getLookback()

Description copied from interface: IIndicator

Returns number of elements needed to calculate value of the first element. Usually depends on optional parameters

Specified by:

getLookback in interface IIndicator

Returns:

number of elements needed to calculate value of the first element

getLookforward

public int getLookforward()

Description copied from interface: IIndicator

Returns number of elements after last element needed to calculate value of the last element. Usually depends on optional parameters

Specified by:

getLookforward in interface IIndicator

Returns:

number of elements needed to calculate value of the last element

drawOutput

public java.awt.Point drawOutput(java.awt.Graphics g,
                                 int outputIdx,
                                 java.lang.Object values2,
                                 java.awt.Color color,
                                 java.awt.Stroke stroke,
                                 IIndicatorDrawingSupport drawingSupport,
                                 java.util.List<java.awt.Shape> indicatorPaths,
                                 java.util.Map<java.awt.Color,java.util.List<java.awt.Point>> indicatorHandlesPoints)

Description copied from interface: IDrawingIndicator

This method will be called once for every output marked as drawnByIndicator every time the chart surface needs to be redrawn

Specified by:

drawOutput in interface IDrawingIndicator

Parameters:

g - graphical context

outputIdx - index of the output parameter

values2 - array of values (int[], double[] or Object[] depending of the type of the output). Array may be empty or null if data is not yet available.

color - color selected when the indicator was added

stroke - stroke selected when the indicator was added

drawingSupport - provides information about candle positions, indexes, etc

indicatorPaths - graphical shapes can be added to this list. This makes it possible to show correct popup when user right-clicks one of the shapes in this list on chart

indicatorHandlesPoints - coordinate points with their corresponding colors can be added to this list

Returns:

X-Y coordinates of last point drawn. This point will be used when drawing last value marker on chart. The marker will not be drawn if null is returned.

getMinMax

public double[] getMinMax(int outputIdx,
                          java.lang.Object values,
                          int firstVisibleValueIndex,
                          int lastVisibleValueIndex)

Description copied from interface: IMinMax

This method will be called once for every output. Method must return array of doubles with two elements - minimal and maximal value. This values will be used to define scale for the indicator if it's drawn on separate panel under main chart. If one of the elements is Double.NaN, then it will be ignored

Specified by:

getMinMax in interface IMinMax

Parameters:

outputIdx - index of the output parameter

values - array of the values (int[], double[] or Object[] depending of the type of the output)

firstVisibleValueIndex - index of the first value that corresponds to the candle that is visible on the screen. Will be 0 even if the values array is with the length of 0

lastVisibleValueIndex - index of the last value that corresponds to the candle that is visible on the screen. Will be -1 if the values array is with the length of 0

Returns:

returns array of doubles with minimal and maximal values. First element is minimal, second is maximal value