Animated Pattern

void setup(){

size(600,600);

smooth ();

background(0);

}

void draw(){

fill(0,0,0,5);

rect(0,0,width, height);

for (int y=0; y<= height; y+=40) {

for (int x=0; x<=width; x+=40) {

stroke(random(255), random(255), random(255),(20));

line(x,y, mouseX,mouseY);

}

}

}