PFont fontA; 

void setup() 
{
  size(200, 200);
  smooth();

  fontA = loadFont("Courier-48.vlw");
  textAlign(CENTER);
  textFont(fontA, 24);
} 

//global variable
float x=width;

void draw() 
{
  background(0);
  fill(202, 202, 0);
  text("Hello World", --x,100);  
  if (x<0) x=width;
}