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function setup() {
createCanvas(windowWidth, windowHeight);
background(100);
// angleMode(DEGREES)
}
var x=200
var y=200
function draw() {
clear()
let angle = Math.atan2(mouseY-y, mouseX-x);
push()
translate(200,200)
rotate(angle)
line(0, 0, 50, 0);
pop()
}