Class ColorUtils

java.lang.Object
gaiasky.util.color.ColorUtils
public class ColorUtils extends Object
Utility functions related to colors.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static float[]
    aOrange
     
    static com.badlogic.gdx.graphics.Color
    aOrangeC
     
    static float[][]
    colorArray
    Highlight color array for datasets
    static float[]
    ddBrown
     
    static com.badlogic.gdx.graphics.Color
    ddBrownC
     
    static float[]
    ddMagenta
     
    static com.badlogic.gdx.graphics.Color
    ddMagentaC
     
    static float[]
    gBlue
     
    static com.badlogic.gdx.graphics.Color
    gBlueC
     
    static float[]
    gGreen
     
    static com.badlogic.gdx.graphics.Color
    gGreenC
     
    static float[]
    gPink
     
    static com.badlogic.gdx.graphics.Color
    gPinkC
     
    static float[]
    gRed
     
    static com.badlogic.gdx.graphics.Color
    gRedC
     
    static float[]
    gWhite
     
    static com.badlogic.gdx.graphics.Color
    gWhiteC
     
    static float[]
    gYellow
     
    static com.badlogic.gdx.graphics.Color
    gYellowC
     
    static float[]
    oCyan
     
    static com.badlogic.gdx.graphics.Color
    oCyanC
     
    static float[]
    oDarkGray
     
    static com.badlogic.gdx.graphics.Color
    oDarkGrayC
     
    static float[]
    oLighterGray
     
    static com.badlogic.gdx.graphics.Color
    oLighterGrayC
     
    static float[]
    oLightGray
     
    static com.badlogic.gdx.graphics.Color
    oLightGrayC
     
    static float[]
    tPurple
     
    static com.badlogic.gdx.graphics.Color
    tPurpleC
     

  • Constructor Summary

    Constructors
    Constructor
    Description
    ColorUtils()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static float[]
    brighten(float[] rgb, float luminosity)
    Returns a copy of the RGB colour brightened up by the given amount
    static float[]
    BVtoRGB(double bv)
    Converts the color index B-V to RGB model.
    static void
    colormap_blue_to_magenta(float value, float[] rgba)
     
    static void
    colormap_blue_white_red(float value, float[] rgba)
    Converts a scalar normalized to the range [0:1] into a blue-white-red rgba color, with blue at 0, white at 0.5 and red at 1.
    static void
    colormap_long_rainbow(float value, float[] rgba)
    Converts a scalar in [0..1] to a long rainbow of rgba values.
    static void
    colormap_short_rainbow(float value, float[] rgba)
    Converts a scalar normalized to the range [0:1] into a short rainbow of rgba values.
    static void
    colormap_yellow_to_red(float value, float[] rgba)
    Converts a scalar in [0..1] to a yellow to red map.
    static int
    getBlue(int rgb)
     
    static float[]
    getColorFromIndex(int idx)
     
    static int
    getGreen(int rgb)
     
    static int
    getRed(int rgb)
     
    static float[]
    getRgbaComplimentary(float[] rgba)
     
    static float[]
    getRgbComplimentary(float[] rgb)
     
    static void
    grayscale(float value, float[] rgba)
    Converts a scalar value that is normalized to [0:1] into a grayscale color vector rgba.
    static float[]
    hexToRgb(String hex)
     
    static float[]
    hexToRgba(String hex)
     
    static float[]
    hsbToRgb(float[] hsb)
     
    static int
    HSBtoRGB(float hue, float saturation, float brightness)
     
    static float[]
    hslToRgb(float[] hsl)
    Converts an HSL color value to RGB.
    static boolean
    isZero(com.badlogic.gdx.graphics.Color c)
     
    static float
    normalize(float value, float min, float max)
     
    static String
    rgbaToHex(float[] color)
     
    static String
    rgbToHex(float[] color)
     
    static float[]
    rgbToHsb(float[] color)
     
    static float[]
    rgbToHsl(float[] rgb)
    Converts an RGB color value to HSL.
    static float[]
    tEffToRGB_harre(double tEff)
    Convert effective temperature to RGB using the Harre and Heller 2021 (Digital Color of Stars) method.
    static float[]
    tEffToRGB_rough(double tEff)
    Converts effective temperature in Kelvin (1000-40000) to RGB.

    Methods inherited from class Object

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

  • Field Details

    • gGreen

      public static float[] gGreen

    • gGreenC

      public static com.badlogic.gdx.graphics.Color gGreenC

    • gBlue

      public static float[] gBlue

    • gBlueC

      public static com.badlogic.gdx.graphics.Color gBlueC

    • gRed

      public static float[] gRed

    • gRedC

      public static com.badlogic.gdx.graphics.Color gRedC

    • gYellow

      public static float[] gYellow

    • gYellowC

      public static com.badlogic.gdx.graphics.Color gYellowC

    • gWhite

      public static float[] gWhite

    • gWhiteC

      public static com.badlogic.gdx.graphics.Color gWhiteC

    • gPink

      public static float[] gPink

    • gPinkC

      public static com.badlogic.gdx.graphics.Color gPinkC

    • aOrange

      public static float[] aOrange

    • aOrangeC

      public static com.badlogic.gdx.graphics.Color aOrangeC

    • tPurple

      public static float[] tPurple

    • tPurpleC

      public static com.badlogic.gdx.graphics.Color tPurpleC

    • ddMagenta

      public static float[] ddMagenta

    • ddMagentaC

      public static com.badlogic.gdx.graphics.Color ddMagentaC

    • ddBrown

      public static float[] ddBrown

    • ddBrownC

      public static com.badlogic.gdx.graphics.Color ddBrownC

    • oLighterGray

      public static float[] oLighterGray

    • oLighterGrayC

      public static com.badlogic.gdx.graphics.Color oLighterGrayC

    • oLightGray

      public static float[] oLightGray

    • oLightGrayC

      public static com.badlogic.gdx.graphics.Color oLightGrayC

    • oDarkGray

      public static float[] oDarkGray

    • oDarkGrayC

      public static com.badlogic.gdx.graphics.Color oDarkGrayC

    • oCyan

      public static float[] oCyan

    • oCyanC

      public static com.badlogic.gdx.graphics.Color oCyanC

    • colorArray

      public static float[][] colorArray
      Highlight color array for datasets

  • Constructor Details

    • ColorUtils

      public ColorUtils()

  • Method Details

    • getColorFromIndex

      public static float[] getColorFromIndex(int idx)

    • getRgbaComplimentary

      public static float[] getRgbaComplimentary(float[] rgba)

    • getRgbComplimentary

      public static float[] getRgbComplimentary(float[] rgb)

    • rgbToHsb

      public static float[] rgbToHsb(float[] color)

    • hsbToRgb

      public static float[] hsbToRgb(float[] hsb)

    • rgbaToHex

      public static String rgbaToHex(float[] color)

    • rgbToHex

      public static String rgbToHex(float[] color)

    • hexToRgba

      public static float[] hexToRgba(String hex)

    • hexToRgb

      public static float[] hexToRgb(String hex)

    • normalize

      public static float normalize(float value, float min, float max)

    • grayscale

      public static void grayscale(float value, float[] rgba)
      Converts a scalar value that is normalized to [0:1] into a grayscale color vector rgba. See: .
      Parameters:
      value - The grayscale value to set to the color.
      rgba - The out parameter containing the color.

    • colormap_blue_white_red

      public static void colormap_blue_white_red(float value, float[] rgba)
      Converts a scalar normalized to the range [0:1] into a blue-white-red rgba color, with blue at 0, white at 0.5 and red at 1.
      Parameters:
      value - The value.
      rgba - The out parameter containing the color.

    • colormap_short_rainbow

      public static void colormap_short_rainbow(float value, float[] rgba)
      Converts a scalar normalized to the range [0:1] into a short rainbow of rgba values. See: .
      Parameters:
      value - The value.
      rgba - The out parameter containing the color.

    • colormap_long_rainbow

      public static void colormap_long_rainbow(float value, float[] rgba)
      Converts a scalar in [0..1] to a long rainbow of rgba values. See here.
      Parameters:
      value - The value in [0..1].
      rgba - The out parameter containing the color.

    • colormap_yellow_to_red

      public static void colormap_yellow_to_red(float value, float[] rgba)
      Converts a scalar in [0..1] to a yellow to red map. See here.
      Parameters:
      value - The value to convert.
      rgba - The out parameter containing the color.

    • colormap_blue_to_magenta

      public static void colormap_blue_to_magenta(float value, float[] rgba)

    • tEffToRGB_harre

      public static float[] tEffToRGB_harre(double tEff)
      Convert effective temperature to RGB using the Harre and Heller 2021 (Digital Color of Stars) method.
      Parameters:
      tEff - The effective temperature of the star.
      Returns:
      The RGB color in a float array.
      See Also:

    • tEffToRGB_rough

      public static float[] tEffToRGB_rough(double tEff)
      Converts effective temperature in Kelvin (1000-40000) to RGB.
      Parameters:
      tEff - Effective temperature.
      Returns:
      The RGB color in a float array.
      See Also:

    • BVtoRGB

      public static float[] BVtoRGB(double bv)
      Converts the color index B-V to RGB model. See here
      Parameters:
      bv - The B-V color index
      Returns:
      The RGB as a float array in [0..1]

    • brighten

      public static float[] brighten(float[] rgb, float luminosity)
      Returns a copy of the RGB colour brightened up by the given amount
      Parameters:
      rgb - The RGB color
      luminosity - The new luminosity amount in [0..1]
      Returns:
      The new RGB array

    • rgbToHsl

      public static float[] rgbToHsl(float[] rgb)
      Converts an RGB color value to HSL. Conversion formula adapted from here. Assumes r, g, and b are contained in the set [0..255] and returns h, s, and l in the set [0..1]
      Parameters:
      rgb - Float array with the RGB values
      Returns:
      Array The HSL representation

    • hslToRgb

      public static float[] hslToRgb(float[] hsl)
      Converts an HSL color value to RGB. Conversion formula adapted from here. Assumes h, s, and l are contained in the set [0..1] and returns r, g, and b in the set [0..255].
      Parameters:
      hsl - Float array with the HSL values
      Returns:
      Array The RGB representation

    • HSBtoRGB

      public static int HSBtoRGB(float hue, float saturation, float brightness)

    • getRed

      public static int getRed(int rgb)

    • getGreen

      public static int getGreen(int rgb)

    • getBlue

      public static int getBlue(int rgb)

    • isZero

      public static boolean isZero(com.badlogic.gdx.graphics.Color c)