PFont f;
String message = "click mouse to shake it up";
// An array of Letter objects
Letter[] letters;

void setup() {
	size(700, 200);
	f = createFont("Arial",56,true);
	textFont(f);
	letters = new Letter[message.length()];
	int x = 16;
	for (int i = 0; i < message.length(); i++) {
		letters[i] = new Letter(x,100,message.charAt(i)); 
		x += textWidth(message.charAt(i));
	}
}

void draw() { 
	background(255);
	for (int i = 0; i < letters.length; i++) {
		letters[i].display();
		if (mousePressed) {
			letters[i].shake();
		} else {
			letters[i].home();
 		}
	}
}

// A class to describe a single Letter
class Letter {
	char letter;
	float homex,homey;
	float x,y;
	Letter (float x_, float y_, char letter_) {
		homex = x = x_;
		homey = y = y_;
		letter = letter_; 
	}
	void display() {
		fill(0);
		textAlign(LEFT);
		text(letter,x,y);
	}
	void shake() {
		x += random(-2,2);
		y += random(-2,2);
	}
	void home() {
		x = homex;
		y = homey; 
	}
}