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20
const barWidth = 20;
let lastBar = -1;
function setup() {
createCanvas(720, 400);
colorMode(HSB, height, height, height);
noStroke();
background(0);
}
function draw() {
let whichBar = mouseX / barWidth;
if (whichBar !== lastBar) {
let barX = whichBar * barWidth;
fill(mouseY, height, height);
rect(barX, 0, barWidth, height);
lastBar = whichBar;
}
}