Creating random colour in Java

Question

I want to draw random coloured points on a JPanel in a Java application  Is there any method to create random colours

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package com adil util         The Class RandomColor       author Adil OUIDAD    URL   http   kizana fr    public class RandomColor                       Gets the random color               return the random color            public static String getRandomColor              String   letters     0   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F             String color                 for  int i   0  i  lt  6  i                   color    letters  int  Math round Math random     15                        return color

User · Answer

Sure  Just generate a color using random RGB values  Like   public Color randomColor       Random random new Random       Probably really put this somewhere where it gets executed only once   int red random nextInt 256     int green random nextInt 256     int blue random nextInt 256     return new Color red  green  blue       You might want to vary up the generation of the random numbers if you don t like the colors it comes up with  I d guess these will tend to be fairly dark

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If you don t want it to look horrible I d suggest defining a list of colours in an array and then using a random number generator to pick one   If you want a truly random colour you can just generate 3 random numbers from 0 to 255 and then use the Color int int int  constructor to create a new Color instance   Random randomGenerator   new Random    int red   randomGenerator nextInt 256   int green   randomGenerator nextInt 256   int blue   randomGenerator nextInt 256    Color randomColour   new Color red green blue

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You can instantiate a color with three floats  r  g  b   each between 0 0 and 1 0  http   download oracle com javase 6 docs api java awt Color html Color float  20float  20float    Using Java s Random class you can easily instantiate a new random color as such   Random r   new Random    Color randomColor   new Color r nextFloat    r nextFloat    r nextFloat       I can t guarantee they ll all be pretty  but they ll be random

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I know it s a bit late for this answer  but I ve not seen anyone else put this   Like Greg said  you want to use the Random class  Random rand   new Random      but the difference I m going to say is simple do this   Color color   new Color rand nextInt 0xFFFFFF      And it s as simple as that  no need to generate lots of different floats

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import android graphics Color   import java util Random   public class ColorDiagram          Member variables  properties about the object      public String   mColors                   39add1      light blue               3079ab      dark blue               c25975      mauve               e15258      red               f9845b      orange               838cc7      lavender               7d669e      purple               53bbb4      aqua               51b46d      green               e0ab18      mustard               637a91      dark gray               f092b0      pink               b7c0c7      light gray                Method  abilities  things the object can do      public int getColor             String color                   Randomly select a fact         Random randomGenerator   new Random       Construct a new Random number generator         int randomNumber   randomGenerator nextInt mColors length            color   mColors randomNumber           int colorAsInt   Color parseColor color            return colorAsInt

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You seem to want light random colors  Not sure what you mean exactly with light  But if you want random  rainbow colors   try this  Random r   new Random    Color c   Color getHSBColor r nextFloat     random hue  color                 1 0   full saturation  1 0 for  colorful  colors  0 0 for grey                 1 0   1 0 for bright  0 0 for black                      Search for HSB color model for more information

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Copy paste this for bright pastel rainbow colors   int R    int  Math random   256   int G    int  Math random   256   int B   int  Math random   256   Color color   new Color R  G  B     random color  but can be bright or dull    to get rainbow  pastel colors Random random   new Random    final float hue   random nextFloat    final float saturation   0 9f   1 0 for brilliant  0 0 for dull final float luminance   1 0f    1 0 for brighter  0 0 for black color   Color getHSBColor hue  saturation  luminance

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Here is a method for getting a random color   private static Random sRandom   public static synchronized int randomColor         if  sRandom    null            sRandom   new Random              return 0xff000000   256   256   sRandom nextInt 256    256   sRandom nextInt 256                sRandom nextInt 256       Benefits    Get the integer representation which can be used with java awt Color or android graphics Color Keep a static reference to Random

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Use the random library   import java util Random    Then create a random generator   Random rand   new Random      As colours are separated into red green and blue  you can create a new random colour by creating random primary colours      Java  Color  class takes 3 floats  from 0 to 1  float r   rand nextFloat    float g   rand nextFloat    float b   rand nextFloat      Then to finally create the colour  pass the primary colours into the constructor   Color randomColor   new Color r  g  b       You can also create different random effects using this method  such as creating random colours with more emphasis on certain colours     pass in less green and blue to produce a  pinker  random colour      Will produce a random colour with more red in it  usually  pink-ish   float r   rand nextFloat    float g   rand nextFloat     2f  float b   rand nextFloat     2f    Or to ensure that only  light  colours are generated  you can generate colours that are always   0 5 of each colour element      Will produce only bright   light colours  float r   rand nextFloat     2f   0 5  float g   rand nextFloat     2f   0 5  float b   rand nextFloat     2f   0 5    There are various other colour functions that can be used with the Color class  such as making the colour brighter   randomColor brighter      An overview of the Color class can be read here  http   download oracle com javase 6 docs api java awt Color html

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A one-liner for random RGB values   new Color  int  Math random     0x1000000

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If you want pleasing  pastel colors  it is best to use the HLS system   final float hue   random nextFloat       Saturation between 0 1 and 0 3 final float saturation    random nextInt 2000    1000    10000f  final float luminance   0 9f  final Color color   Color getHSBColor hue  saturation  luminance

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I have used this simple and clever way for creating random color in Java   Random random   new Random            System out println String format    06x   random nextInt 256 256 256       Where   06x gives you zero-padded hex  always 6 characters long

[java] Creating random colour in Java?

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