org.mov.chart.graph
Class OBVGraph

java.lang.Object
  org.mov.chart.graph.AbstractGraph
      org.mov.chart.graph.OBVGraph

All Implemented Interfaces:

Graph

public class OBVGraph
extends AbstractGraph

On Balance Volume (OBV) graph. This graph is used as a precursor for stock trends. If it goes down its a possible indicator that the stock will too and vice-versa. OBV is calculated by starting with an arbitary constant. To calculate a day's OBV, get the previous day's OBV. If the stock went up that day, add the volume. If the stock went down, minus the volume.

Author:

Andrew Leppard

Field Summary

Fields inherited from interface org.mov.chart.graph.Graph

TOOL_TIP_BUFFER

Constructor Summary

OBVGraph(GraphSource open, GraphSource close, GraphSource volume)
Create a new On Balance Volume (OBV) graph.

Method Summary

static Graphable	createOBV(Graphable open, Graphable close, Graphable volume) Create OBV graphable.
double	getHighestY(java.util.List x) Return the highest Y value in the given X range.
double	getLowestY(java.util.List x) Return the loweset Y value in the given X range.
java.lang.String	getName() Return the name of this graph.
java.lang.String	getToolTipText(java.lang.Comparable x, int y, int yoffset, double verticalScale, double bottomLineValue) Get the tool tip text for the given X value and y coordinate.
boolean	isPrimary() Return whether the graph is a primary graph.
void	render(java.awt.Graphics g, java.awt.Color colour, int xoffset, int yoffset, double horizontalScale, double verticalScale, double bottomLineValue, java.util.List xRange) Draw the graph.

Methods inherited from class org.mov.chart.graph.AbstractGraph

getAcceptableMajorDeltas, getAcceptableMinorDeltas, getEndX, getSettings, getSource, getSourceName, getStartX, getUI, getXRange, getY, getYLabel, setSettings

Methods inherited from class java.lang.Object

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

Constructor Detail

OBVGraph

public OBVGraph(GraphSource open,
                GraphSource close,
                GraphSource volume)

Create a new On Balance Volume (OBV) graph.

Parameters:

open - the day open price

close - the day close price

volume - the day volume

Method Detail

render

public void render(java.awt.Graphics g,
                   java.awt.Color colour,
                   int xoffset,
                   int yoffset,
                   double horizontalScale,
                   double verticalScale,
                   double bottomLineValue,
                   java.util.List xRange)

Description copied from interface: Graph

Draw the graph.

Parameters:

g - the Graphics object to render to

colour - the colour the graph should be rendered in; override this if the graph should be drawn in a certain colour - such as a Moving Average graph

xoffset - the x offset in the graphics object where the graph starts

yoffset - the y offset in the graphics object where the graph starts

horizontalScale - horizontal scale factor; use this to convert between X value in the xRange to a cartesian coordinate x

verticalScale - vertical scale factor; use this to convert between Y value to a cartesian coordinate y

bottomLineValue - the Y value of the lowest line in the graph

xRange - a List of Comparable that contain the X values to plot

getToolTipText

public java.lang.String getToolTipText(java.lang.Comparable x,
                                       int y,
                                       int yoffset,
                                       double verticalScale,
                                       double bottomLineValue)

Description copied from class: AbstractGraph

Get the tool tip text for the given X value and y coordinate.

Specified by:

getToolTipText in interface Graph

Overrides:

getToolTipText in class AbstractGraph

Parameters:

x - the X value

y - the y coordinate

yoffset - y offset from top of graph

verticalScale - vertical scale factor

bottomLineValue - the Y value of the lowest line in the graph

Returns:

the tool tip text for the default GraphSource

getHighestY

public double getHighestY(java.util.List x)

Description copied from class: AbstractGraph

Return the highest Y value in the given X range.

Specified by:

getHighestY in interface Graph

Overrides:

getHighestY in class AbstractGraph

Parameters:

x - range of X values

Returns:

the highest Y value of the default GraphSource

getLowestY

public double getLowestY(java.util.List x)

Description copied from class: AbstractGraph

Return the loweset Y value in the given X range.

Specified by:

getLowestY in interface Graph

Overrides:

getLowestY in class AbstractGraph

Parameters:

x - range of X values

Returns:

the lowest Y value of the default GraphSource

createOBV

public static Graphable createOBV(Graphable open,
                                  Graphable close,
                                  Graphable volume)

Create OBV graphable.

Parameters:

open - the day open price

close - the day close price

volume - the day volume

Returns:

the OBV

getName

public java.lang.String getName()

Return the name of this graph.

Returns:

OBV

isPrimary

public boolean isPrimary()

Description copied from interface: Graph

Return whether the graph is a primary graph. Primary graphs will appear together in the top chart. Secondary graphs appear in their own charts which are added below. The day close graph is primary; while the day close graph is secondary.

Returns:

true if the graph is a primary graph