Processing - trabalho com animação

Código:

float x = 0.0;

float y = 0.0;

float atraso = 0.05; // de 0.0 a 1.0

void setup() {

size(500, 500);

smooth();

}

void draw() {

background(0);

noStroke();

fill(255);

rect(50,50,400,400);

fill(0);

rect(100,100,300,300);

fill(255);

rect(150,150,200,200);

fill(0);

rect(200,200,100,100);

float targetX = mouseX;

float targetY = mouseY;

x += (targetX - x) * atraso;

y += (targetY - y) * atraso;

fill(255);

rect(x, y,80,80);

fill(0);

rect(x+20, y+20,40,40);

}