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let x;
let w;
let colorr;
let colorg;
let colorb;
function setup() {
createCanvas(400, 400);
w = width / 20;
}
function draw() {
background(220);
for (let i = 0; i < 20; i++) {
x = i * 20;
colorr = 0
colorg = map(i, 0, 19, 255, 0);
colorb = map(i, 0, 19, 0, 255);
if (mouseX > x && mouseX < x + w) {
fill(colorr,colorg,colorb);
} else {
fill(255);
}
rect(x, 0, w, 400);
}
}