background(26, 28, 18);
stroke(0, 0, 0, 40);
var lastX = mouseX;
var lastY = mouseY;

var draw = function() {
    var speedX = abs(mouseX - lastX);
    var speedY = abs(mouseY - lastY);
    var speedAve = (speedX + speedY) / 2;
    if (mouseIsPressed) {
        fill(lastX, lastY, 0);
    } else {
        fill(lastX, lastY, 0, 40);
    }
    ellipse(mouseX, mouseY, speedAve, speedAve);
    lastX = mouseX;
    lastY = mouseY;
    
    fill(26, 28, 18, 1);
    rect(0,0,500,500);
};