Creating random colour in Java?

by

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

More Related Contents:

  1. Random shuffling of an array
  2. Creating random numbers with no duplicates
  3. refreshing background color for a row in jtable
  4. Java random numbers using a seed
  5. Java random always returns the same number when I set the seed?
  6. How to automatically generate N “distinct” colors?
  7. How to generate a random alpha-numeric string
  8. Generate a random double in a range
  9. How to convert a color integer to a hex String in Android?
  10. Convert RGB values to color name
  11. Picking a random element from a set
  12. How to generate a random BigInteger value in Java?
  13. How can I generate random number in specific range in Android? [duplicate]
  14. Generating a Random Number between 1 and 10 Java [duplicate]
  15. How good is java.util.Random?
  16. Android Color Picker [closed]
  17. How can I generate a random number within a range but exclude some?
  18. Android Color Notification Icon
  19. Algorithm to generate Poisson and binomial random numbers?
  20. Color fading algorithm?
  21. best way to pick a random subset from a collection?
  22. JFreeChart BarChart -> NO gradient
  23. Is Random class thread safe?
  24. Android: Changing Background-Color of the Activity (Main View)
  25. Generate Random Numbers in Array [duplicate]
  26. What is the best way to read pixels of a JavaFX Canvas?
  27. Why are initial random numbers similar when using similar seeds?
  28. Random element from string array [closed]
  29. How to change the background color for JPanels with Nimbus Look and Feel?
  30. SecureRandom with NativePRNG vs SHA1PRNG

Leave a Comment