Venice 0.751beta

nz.org.venice.chart.graph
Class OBVGraph

java.lang.Object
  extended bynz.org.venice.chart.graph.AbstractGraph
      extended bynz.org.venice.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 nz.org.venice.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 topLineValue, double bottomLineValue, java.util.List xRange, boolean vertOrientation)
          Draw the graph.
 
Methods inherited from class nz.org.venice.chart.graph.AbstractGraph
dataAvailable, getAcceptableMajorDeltas, getAcceptableMinorDeltas, getEndX, getSettings, getSource, getSourceName, getSourceType, 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 topLineValue,
                   double bottomLineValue,
                   java.util.List xRange,
                   boolean vertOrientation)
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
topLineValue - the Y value of the lowest line in the graph
bottomLineValue - the Y value of the lowest line in the graph
xRange - a List of Comparable that contain the X values to plot
vertOrientation - true if increasing y values mean decreasing Y values

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

Venice 0.751beta