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var xpos = 100;
var speed = 1;
function setup() {
createCanvas(300, 300);
}
function draw() {
background(255);
strokeWeight(3);
stroke(0);
fill(255);
rect(0, 0, 300, 300);
ellipseMode(CENTER);
xpos = xpos + speed;
if ((xpos > width-100) || (xpos < 100)) {
speed = speed * -1;
}
fill(0);
//rotate
translate(150, 150);
rotate(radians(frameCount));
ellipse(0,0,100,100);
fill(255);
rect(0,0,80,80);
}