I want to draw random coloured points on a JPanel in a Java application. Is there any method to create random colours?
Use the random library:
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:
An overview of the
Color class can be read here: http://download.oracle.com/javase/6/docs/api/java/awt/Color.html