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var xpos = 100;
var speed = 0.07;//la vitesse
function setup() {
createCanvas(300, 300);
}
function draw() {
background(255);
strokeWeight(3);
stroke(0);
fill(255);
rect(0, 0, 300, 300);
xpos = xpos + speed;
fill(0);
ellipse(width/2,height/2,xpos,xpos);
}