Random numbers are often used in programming, everywhere from encrypting data to generative design. Processing offers simple function to get a random number:
random([lower Limit],[upper Limit])
void setup()
{
size(300,300);
background(0);
noLoop();
}
void draw()
{
stroke(random(100,200));
fill(random(50,100),random(50,100),random(150,255));
strokeWeight(random(1,5));
ellipse(random(0,width),random(0,height),random(10,100),random(10,100));
}
void mousePressed()
{
redraw();
}