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function setup() {
createCanvas(400, 400);
background("black");
}
function draw() {
colorMode(RGB)
if (mouseIsPressed){
var r = map(mouseX, 0, 400, 0, 255) // compress 0 - 400 into 0 - 255
var g = map(mouseY, 0, 400, 0, 255)
var b = 100
fill(r, g, b)
noStroke();
circle(mouseX, mouseY, 25)
}
}