org.rrd4j.graph

Class Stack

java.lang.Object

org.rrd4j.graph.PlotElement

org.rrd4j.graph.SourcedPlotElement

org.rrd4j.graph.Stack

class Stack
extends SourcedPlotElement

Represents a stacked plot element in RRD graphs. Extends SourcedPlotElement to stack values on top of a parent element for cumulative graphing. Enables creation of stacked area and line charts showing cumulative totals.

Field Summary

Fields inherited from class org.rrd4j.graph.SourcedPlotElement

parent, srcName, values

Fields inherited from class org.rrd4j.graph.PlotElement

color

Constructor Summary

Constructors

Constructor and Description
Stack(SourcedPlotElement parent, String srcName, Paint color) Creates a stacked plot element with the specified parent, source name, and color.

Method Summary

Modifier and Type	Method and Description
(package private) void	assignValues(DataProcessor dproc) Assigns values by stacking this element's data on top of parent values.
(package private) Paint	getParentColor() Gets the color of the parent element.
(package private) float	getParentLineWidth() Gets the line width of the parent element.

Methods inherited from class org.rrd4j.graph.SourcedPlotElement

getMaxValue, getMinValue, getValues, stackValues

Methods inherited from class java.lang.Object

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

Constructor Detail

Stack

Stack(SourcedPlotElement parent,
      String srcName,
      Paint color)

Creates a stacked plot element with the specified parent, source name, and color.

Parameters:

parent - the parent plot element to stack on top of

srcName - the name of the data source

color - the color for this stacked element

Method Detail

assignValues

void assignValues(DataProcessor dproc)

Assigns values by stacking this element's data on top of parent values. Handles NaN values appropriately to maintain data integrity.

Overrides:

assignValues in class SourcedPlotElement

Parameters:

dproc - the data processor containing source values

getParentColor

Paint getParentColor()

Gets the color of the parent element.

Overrides:

getParentColor in class SourcedPlotElement

Returns:

parent element's color

getParentLineWidth

float getParentLineWidth()

Gets the line width of the parent element. Returns -1 for area elements (indicating no line width).

Returns:

parent line width, or -1 for area elements