3.1: Introduction to Conditional Statements - p5.js Tutorial.js

function setup() {
  createCanvas(600, 400);
}

function draw() {
  background(0);
  stroke(255);
  strokeWeight(4);
  noFill();

  if (mouseX > 300) {
  fill(255, 0, 200);
  }
  ellipse(300, 200, 100, 100)
}