com.approximatrix.charting.render.colorscale
Class IndexedColorScale

java.lang.Object
  com.approximatrix.charting.render.colorscale.AbstractColorScale
      com.approximatrix.charting.render.colorscale.IndexedColorScale

All Implemented Interfaces:

ColorScale

public class IndexedColorScale
extends AbstractColorScale

Provides a color scale object that looks up colors based on an index passed. The index/Color pairs must be assigned prior to calling a conversion method. Returns FAILED_LOOKUP when the index does not exist in the Map.

Author:

armstrong

Field Summary

protected static java.awt.Color	FAILED_LOOKUP The color to return if the index does not exist
protected java.util.Map<java.lang.Integer,java.awt.Color>	map Maps integers to Colors

Constructor Summary

IndexedColorScale()
Constructs the IndexedColorScale object and initializes an empty color map.

IndexedColorScale(java.util.Map<java.lang.Integer,java.awt.Color> map)
Constructs the IndexedColorScale object based on the passed map of index/Color pairs.

Method Summary

java.awt.Color	getColor(double value) Retrieves the color by converting the value by rounding to an integer before requesting the Color of the rounded index.
java.awt.Color	getColor(int value) Returns a color based on an integer data value
void	setColor(int i, java.awt.Color val) Assigns the specified Color to the specified index in the map.

Methods inherited from class com.approximatrix.charting.render.colorscale.AbstractColorScale

getColors, getColors

Methods inherited from class java.lang.Object

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

Field Detail

FAILED_LOOKUP

protected static final java.awt.Color FAILED_LOOKUP

The color to return if the index does not exist

map

protected java.util.Map<java.lang.Integer,java.awt.Color> map

Maps integers to Colors

Constructor Detail

IndexedColorScale

public IndexedColorScale()

Constructs the IndexedColorScale object and initializes an empty color map.

IndexedColorScale

public IndexedColorScale(java.util.Map<java.lang.Integer,java.awt.Color> map)

Constructs the IndexedColorScale object based on the passed map of index/Color pairs.

Parameters:

map - a Map with Integer keys and Color values

Method Detail

setColor

public void setColor(int i,
                     java.awt.Color val)

Assigns the specified Color to the specified index in the map. Overwrites existing matching indices.

Parameters:

i - index of the added color

val - the Color value

getColor

public java.awt.Color getColor(double value)

Retrieves the color by converting the value by rounding to an integer before requesting the Color of the rounded index.

Parameters:

value - the data space value

Returns:

a valid Color object

getColor

public java.awt.Color getColor(int value)

Description copied from interface: ColorScale

Returns a color based on an integer data value

Parameters:

value - the data space value

Returns:

a valid Color object