Package com.helger.css.utils

Class CSSColorHelper

java.lang.Object

com.helger.css.utils.CSSColorHelper

@Immutable
public final class CSSColorHelper
extends Object

Provides color handling sanity methods.

Author:

Philip Helger

Field Summary

Fields

Modifier and Type	Field	Description
static int	HSL_MAX	HSL maximum value (for Hue only)
static int	HSL_MIN	HSL minimum value (for Hue only)
static int	HSL_RANGE	HSL range (max-min+1) (for Hue only)
static float	OPACITY_MAX	Maximum opacity value
static float	OPACITY_MIN	Minimum opacity value
static int	PERCENTAGE_MAX	Percentage maximum value (for HSL)
static int	PERCENTAGE_MIN	Percentage minimum value (for HSL)
static int	RGB_MAX	RGB maximum value
static int	RGB_MIN	RGB minimum value
static int	RGB_RANGE	RGB range (max-min+1)

Method Summary

Modifier and Type	Method	Description
static String	getHexColorValue(int nRed, int nGreen, int nBlue)
static String	getHSLAColorValue(float fHue, float fSaturation, float fLightness, float fOpacity)	Get the passed values as CSS HSLA color value
static String	getHSLAColorValue(int nHue, int nSaturation, int nLightness, float fOpacity)	Get the passed values as CSS HSLA color value
static int[]	getHSLAsRGBValue(float fHue, float fSaturation, float fLightness)	Get the passed RGB values as HSL values compliant for CSS in the CSS range (0-359, 0-100, 0-100)
static String	getHSLColorValue(float fHue, float fSaturation, float fLightness)	Get the passed values as CSS HSL color value
static String	getHSLColorValue(int nHue, int nSaturation, int nLightness)	Get the passed values as CSS HSL color value
static float	getHSLHueValue(float fHSLPart)	Get the passed value as a valid HSL Hue value in the range of 0-359
static int	getHSLHueValue(int nHSLPart)	Get the passed value as a valid HSL Hue value in the range of 0-359
static float	getHSLPercentageValue(float nHSLPart)	Get the passed value as a valid HSL Saturation or Lightness value in the range of PERCENTAGE_MIN-PERCENTAGE_MAX (percentage).
static int	getHSLPercentageValue(int nHSLPart)	Get the passed value as a valid HSL Saturation or Lightness value in the range of 0-100 (percentage).
static float	getOpacityToUse(float fOpacity)	Ensure that the passed opacity value is in the range OPACITY_MIN and OPACITY_MAX.
static CSSHSLA	getParsedHSLAColorValue(String sValue)
static CSSHSL	getParsedHSLColorValue(String sValue)
static CSSRGBA	getParsedRGBAColorValue(String sValue)
static CSSRGB	getParsedRGBColorValue(String sValue)	Extract the CSS RGB color value from the passed String.
static String	getRGBAColorValue(int nRed, int nGreen, int nBlue, float fOpacity)	Get the passed values as CSS RGBA color value
static float[]	getRGBAsHSLValue(int nRed, int nGreen, int nBlue)	Get the passed RGB values as HSL values compliant for CSS in the CSS range (0-359, 0-100, 0-100)
static String	getRGBColorValue(int nRed, int nGreen, int nBlue)	Get the passed values as CSS RGB color value
static int	getRGBValue(int nRGBPart)	Convert the passed value to a valid RGB value in the range 0-255.
static boolean	isColorValue(String sValue)	Check if the passed string is any color value.
static boolean	isHexColorValue(String sValue)	Check if the passed String is valid CSS hex color value.
static boolean	isHSLAColorValue(String sValue)	Check if the passed String is valid CSS HSLA color value.
static boolean	isHSLColorValue(String sValue)	Check if the passed String is valid CSS HSL color value.
static boolean	isRGBAColorValue(String sValue)	Check if the passed String is valid CSS RGBA color value.
static boolean	isRGBColorValue(String sValue)	Check if the passed String is valid CSS RGB color value.

Methods inherited from class java.lang.Object

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

Field Detail

RGB_MIN

public static final int RGB_MIN

RGB minimum value

See Also:

Constant Field Values

RGB_MAX

public static final int RGB_MAX

RGB maximum value

See Also:

Constant Field Values

RGB_RANGE

public static final int RGB_RANGE

RGB range (max-min+1)

See Also:

Constant Field Values

HSL_MIN

public static final int HSL_MIN

HSL minimum value (for Hue only)

See Also:

Constant Field Values

HSL_MAX

public static final int HSL_MAX

HSL maximum value (for Hue only)

See Also:

Constant Field Values

HSL_RANGE

public static final int HSL_RANGE

HSL range (max-min+1) (for Hue only)

See Also:

Constant Field Values

PERCENTAGE_MIN

public static final int PERCENTAGE_MIN

Percentage minimum value (for HSL)

See Also:

Constant Field Values

PERCENTAGE_MAX

public static final int PERCENTAGE_MAX

Percentage maximum value (for HSL)

See Also:

Constant Field Values

OPACITY_MIN

public static final float OPACITY_MIN

Minimum opacity value

See Also:

Constant Field Values

OPACITY_MAX

public static final float OPACITY_MAX

Maximum opacity value

See Also:

Constant Field Values

Method Detail

isColorValue

public static boolean isColorValue(@Nullable
                                   String sValue)

Check if the passed string is any color value.

Parameters:

sValue - The value to check. May be null.

Returns:

true if the passed value is not null, not empty and a valid CSS color value.

See Also:

isRGBColorValue(String), isRGBAColorValue(String), isHSLColorValue(String), isHSLAColorValue(String), isHexColorValue(String), ECSSColor.isDefaultColorName(String), ECSSColorName.isDefaultColorName(String), CCSSValue.CURRENTCOLOR, CCSSValue.TRANSPARENT

isRGBColorValue

public static boolean isRGBColorValue(@Nullable
                                      String sValue)

Check if the passed String is valid CSS RGB color value. Example value: rgb(255,0,0)

Parameters:

sValue - The value to check. May be null.

Returns:

true if it is a CSS RGB color value, false if not

getParsedRGBColorValue

@Nullable
public static CSSRGB getParsedRGBColorValue(@Nullable
                                            String sValue)

Extract the CSS RGB color value from the passed String. Example value: rgb(255,0,0)

Parameters:

sValue - The value to extract the value from. May be null.

Returns:

null if the passed value is not a valid CSS RGB color value.

isRGBAColorValue

public static boolean isRGBAColorValue(@Nullable
                                       String sValue)

Check if the passed String is valid CSS RGBA color value. Example value: rgba(255,0,0, 0.1)

Parameters:

sValue - The value to check. May be null.

Returns:

true if it is a CSS RGBA color value, false if not

getParsedRGBAColorValue

@Nullable
public static CSSRGBA getParsedRGBAColorValue(@Nullable
                                              String sValue)

isHSLColorValue

public static boolean isHSLColorValue(@Nullable
                                      String sValue)

Check if the passed String is valid CSS HSL color value. Example value: hsl(255,0%,0%)

Parameters:

sValue - The value to check. May be null.

Returns:

true if it is a CSS HSL color value, false if not

getParsedHSLColorValue

@Nullable
public static CSSHSL getParsedHSLColorValue(@Nullable
                                            String sValue)

isHSLAColorValue

public static boolean isHSLAColorValue(@Nullable
                                       String sValue)

Check if the passed String is valid CSS HSLA color value. Example value: hsla(255,0%,0%, 0.1)

Parameters:

sValue - The value to check. May be null.

Returns:

true if it is a CSS HSLA color value, false if not

getParsedHSLAColorValue

@Nullable
public static CSSHSLA getParsedHSLAColorValue(@Nullable
                                              String sValue)

isHexColorValue

public static boolean isHexColorValue(@Nullable
                                      String sValue)

Check if the passed String is valid CSS hex color value. Example value: #ff0000

Parameters:

sValue - The value to check. May be null.

Returns:

true if it is a CSS hex color value, false if not

getRGBValue

@Nonnegative
public static int getRGBValue(int nRGBPart)

Convert the passed value to a valid RGB value in the range 0-255.

Parameters:

nRGBPart - The original value

Returns:

The value between 0 and 255.

getOpacityToUse

@Nonnegative
public static float getOpacityToUse(float fOpacity)

Ensure that the passed opacity value is in the range OPACITY_MIN and OPACITY_MAX.

Parameters:

fOpacity - The original opacity

Returns:

The opacity in the correct range between 0 and 1.

getRGBColorValue

@Nonnull
@Nonempty
public static String getRGBColorValue(int nRed,
                                      int nGreen,
                                      int nBlue)

Get the passed values as CSS RGB color value

Parameters:

nRed - Red - is scaled to 0-255

nGreen - Green - is scaled to 0-255

nBlue - Blue - is scaled to 0-255

Returns:

The CSS string to use

getRGBAColorValue

@Nonnull
@Nonempty
public static String getRGBAColorValue(int nRed,
                                       int nGreen,
                                       int nBlue,
                                       float fOpacity)

Get the passed values as CSS RGBA color value

Parameters:

nRed - Red - is scaled to 0-255

nGreen - Green - is scaled to 0-255

nBlue - Blue - is scaled to 0-255

fOpacity - Opacity to use - is scaled to 0-1.

Returns:

The CSS string to use

getHSLHueValue

@Nonnegative
public static int getHSLHueValue(int nHSLPart)

Get the passed value as a valid HSL Hue value in the range of 0-359

Parameters:

nHSLPart - Source Hue

Returns:

Hue value in the range of 0-359

getHSLHueValue

@Nonnegative
public static float getHSLHueValue(float fHSLPart)

Get the passed value as a valid HSL Hue value in the range of 0-359

Parameters:

fHSLPart - Source Hue

Returns:

Hue value in the range of 0-359

getHSLPercentageValue

@Nonnegative
public static int getHSLPercentageValue(int nHSLPart)

Get the passed value as a valid HSL Saturation or Lightness value in the range of 0-100 (percentage).

Parameters:

nHSLPart - Source value

Returns:

Target value in the range of 0- 100

getHSLPercentageValue

@Nonnegative
public static float getHSLPercentageValue(float nHSLPart)

Get the passed value as a valid HSL Saturation or Lightness value in the range of PERCENTAGE_MIN-PERCENTAGE_MAX (percentage).

Parameters:

nHSLPart - Source value

Returns:

Target value in the range of 0- 100

getHSLColorValue

@Nonnull
@Nonempty
public static String getHSLColorValue(int nHue,
                                      int nSaturation,
                                      int nLightness)

Get the passed values as CSS HSL color value

Parameters:

nHue - Hue - is scaled to 0-359

nSaturation - Saturation - is scaled to 0-100

nLightness - Lightness - is scaled to 0-100

Returns:

The CSS string to use

getHSLColorValue

@Nonnull
@Nonempty
public static String getHSLColorValue(float fHue,
                                      float fSaturation,
                                      float fLightness)

Get the passed values as CSS HSL color value

Parameters:

fHue - Hue - is scaled to 0-359

fSaturation - Saturation - is scaled to 0-100

fLightness - Lightness - is scaled to 0-100

Returns:

The CSS string to use

getHSLAColorValue

@Nonnull
@Nonempty
public static String getHSLAColorValue(int nHue,
                                       int nSaturation,
                                       int nLightness,
                                       float fOpacity)

Get the passed values as CSS HSLA color value

Parameters:

nHue - Hue - is scaled to 0-359

nSaturation - Saturation - is scaled to 0-100

nLightness - Lightness - is scaled to 0-100

fOpacity - Opacity - is scaled to 0-1

Returns:

The CSS string to use

getHSLAColorValue

@Nonnull
@Nonempty
public static String getHSLAColorValue(float fHue,
                                       float fSaturation,
                                       float fLightness,
                                       float fOpacity)

Get the passed values as CSS HSLA color value

Parameters:

fHue - Hue - is scaled to 0-359

fSaturation - Saturation - is scaled to 0-100

fLightness - Lightness - is scaled to 0-100

fOpacity - Opacity - is scaled to 0-1

Returns:

The CSS string to use

getHexColorValue

@Nonnull
@Nonempty
public static String getHexColorValue(int nRed,
                                      int nGreen,
                                      int nBlue)

getRGBAsHSLValue

@Nonnull
@Nonempty
public static float[] getRGBAsHSLValue(int nRed,
                                       int nGreen,
                                       int nBlue)

Get the passed RGB values as HSL values compliant for CSS in the CSS range (0-359, 0-100, 0-100)

Parameters:

nRed - red value

nGreen - green value

nBlue - blue value

Returns:

An array of 3 floats, containing hue, saturation and lightness (in this order). The first value is in the range 0-359, and the remaining two values are in the range 0-100 (percentage).

getHSLAsRGBValue

@Nonnull
@Nonempty
public static int[] getHSLAsRGBValue(float fHue,
                                     float fSaturation,
                                     float fLightness)

Get the passed RGB values as HSL values compliant for CSS in the CSS range (0-359, 0-100, 0-100)

Parameters:

fHue - the hue component of the color - in the range 0-359

fSaturation - the saturation of the color - in the range 0-100

fLightness - the lightness of the color - in the range 0-100

Returns:

An array of 3 ints, containing red, green and blue (in this order). All values are in the range 0-255.