Processing 2

Código fonte:

void setup() {
size(600,400);
background(255);
smooth();
}

void draw() {
if (mousePressed == true) {
fill(0,150,250,100);
stroke(255);
rect(mouseY,mouseY,mouseX,mouseX);
fill(0,250,200,600);
stroke(255);
rect(mouseX,mouseX,mouseY,mouseY);
fill(250,0,150,50);
stroke(255);
rect(mouseX,mouseY,mouseX,mouseY);
fill(0,200,250,50);
stroke(255);
rect(mouseY,mouseX,mouseY,mouseX);
} else {
background(255);
}
}