org.conqat.lib.commons.color

Class RandomColorProvider<T>

java.lang.Object

org.conqat.lib.commons.color.RandomColorProvider<T>

All Implemented Interfaces:

IColorProvider<T>

public class RandomColorProvider<T>
extends java.lang.Object
implements IColorProvider<T>

Color provider returning a random color.

Constructor Summary

Constructors

Constructor and Description
RandomColorProvider()

Method Summary

Modifier and Type	Method and Description
protected java.awt.Color	generateColor() Generates a new color.
java.awt.Color	getColor(T t) Returns the color to be used for a given element.
protected java.lang.Object	getKey(T t) Returns the key which is used for color generation.

Methods inherited from class java.lang.Object

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

Constructor Detail

RandomColorProvider

public RandomColorProvider()

Method Detail

getColor

public java.awt.Color getColor(T t)

Returns the color to be used for a given element.

Specified by:

getColor in interface IColorProvider<T>

generateColor

protected java.awt.Color generateColor()

Generates a new color. This is based on the hue/saturation/brightness model (http://en.wikipedia.org/wiki/HSL_and_HSV). The overall idea is to always use full saturation (to get nice colors) and two levels of brightness. For each brightness level we determine the hue value (360 degree color wheel) by first using 3 different values, next using the 3 between each of these, then the 6 between the previous 6 (3+3), then 12 between those, and so on. For brightness we alternate as follows: 3 initial color bright, 3 initial color non-bright, 3 second step colors bright, 3 second step colors non-bright, 6 third step colors bright, etc.

getKey

protected java.lang.Object getKey(T t)

Returns the key which is used for color generation. This key must support Object.equals(Object) and Object.hashCode() as this key is used for color caching as well. The default implementation just uses the element from getColor(Object) (i.e. identity).