p5 로 trail effect 만들기

/* sketch.js */

let mousePositions  = []
const MAX_POS       = 100

function setup() {

  createCanvas(500, 500)

}

function draw() {

    background('tomato')

    ellipse(mouseX, mouseY, 50, 50)

    mousePositions.push({x: mouseX, y: mouseY})
    
    if (mousePositions.length > MAX_POS) mousePositions.shift()

    for (let i = 0; i < mousePositions.length; ++i) {

        ellipse(mousePositions[i].x, mousePositions[i].y, i, i)
        
    }

}