org.serversass.ast

Class Color

java.lang.Object

org.serversass.ast.Color

All Implemented Interfaces:

Expression

public class Color
extends Object
implements Expression

Represents a color like #565656.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	Color.HSL Value class to represent a hue, saturation, lightness triple.

Field Summary

Fields

Modifier and Type	Field and Description
static double	EPSILON Used to determine "equality" for floating point numbers

Constructor Summary

Constructors

Constructor and Description
Color(int hue, double saturation, double lightness, double transparency) Creates a color based on the given HSL values.
Color(int r, int g, int b) Creates a new RGB color based on the given values for red, green and blue.
Color(int r, int g, int b, double a) Creates a new RGB color withl alpha channel (transparency)
Color(String hexString) Creates a new RGB color based on the given hex string

Method Summary

Modifier and Type	Method and Description
Expression	eval(Scope scope, Generator gen) If possible the expression is evaluated and a simplified expression is returned.
Color.HSL	getHSL() Computes the HSL value form the stored RGB values.
boolean	isConstant() Determines if this expression is constant or if it depends on variables.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

EPSILON

public static final double EPSILON

Used to determine "equality" for floating point numbers

See Also:

Constant Field Values

Constructor Detail

Color

public Color(String hexString)

Creates a new RGB color based on the given hex string

Parameters:

hexString - a hex representation like #ff00ff

Color

public Color(int r,
             int g,
             int b)

Creates a new RGB color based on the given values for red, green and blue.

Parameters:

r - the value for red 0..255

g - the value for green 0..255

b - the value for blue 0..255

Color

public Color(int r,
             int g,
             int b,
             double a)

Creates a new RGB color withl alpha channel (transparency)

Parameters:

r - the value for red 0..255

g - the value for green 0..255

b - the value for blue 0..255

a - the transparency (opacity) 0..1

Color

public Color(int hue,
             double saturation,
             double lightness,
             double transparency)

Creates a color based on the given HSL values.

Parameters:

hue - the hue 0..360 degrees

saturation - the saturation of the color 0..1

lightness - the lightness of the color 0..1

transparency - the transparency of the color 0..1

Method Detail

isConstant

public boolean isConstant()

Description copied from interface: Expression

Determines if this expression is constant or if it depends on variables.

Specified by:

isConstant in interface Expression

Returns:

true if the expression is constant, false otherwise

eval

public Expression eval(Scope scope,
                       Generator gen)

Description copied from interface: Expression

If possible the expression is evaluated and a simplified expression is returned.

Specified by:

eval in interface Expression

Parameters:

scope - the scope used to resolve variables.

gen - the generator used to evaluate functions

Returns:

a possibly simplified version of the expression

getHSL

public Color.HSL getHSL()

Computes the HSL value form the stored RGB values.

Returns:

a triple containing the hue, saturation and lightness

toString

public String toString()

Overrides:

toString in class Object