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let val = 0
function setup() {
createCanvas(400, 400);
background('#FFFFFC');
}
function draw() {
background('#FFFFFC');
val = round(map(mouseX,0, width, 0 ,255));
fill(255,64,0, val)
push()
noStroke()
circle(width/2,height/2,100)
pop()
}