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function setup() {
createCanvas(windowWidth, windowHeight);
background(0);
rectMode(CENTER);
noStroke();
frameRate(10);
}
var trans = 0;
var rot = 0;
var scl = 1;
var flag = 0;
function draw() {
translate(width/2,height/2);
rotate(rot);
scale(scl*0.01);
for(var i=0; i < width; i += 30){
for (var j=0; j < height; j += 20){
if(flag == 0){
fill(255);
flag = 1;
}else if(flag == 1){
fill(0);
flag = 0;
}
rect(0,0,width-i,height-j);
}
}
scl += 1;
rot += 0.1;
//noLoop();
}