​

}

​

function expoCalc(startTC, endTC, t) {

  const maxY = (1-Math.pow(Math.E, (-endTC))); //scaling factor

  if (endTC > startTC) return (1-Math.pow(Math.E, (t*-endTC)))/maxY;

  return (Math.pow(Math.E, (t*-startTC)));

}

​

function draw() {

  const screen_width = 800;

  createCanvas(screen_width, 600);

  background(220);

  //let a = exp(mouseX /screen_width)/200 -.005;

  let a = 0.01;

  //if (mouseX <= 0) a =.01;

  console.log(a);

  //let d = 0.01;

  let d = exp(mouseX /screen_width)/200 -.005;

  let s = 0.75;

  let s_count = 0; //time to sustain;

  let r = 0.0025;

  let stage = 0;

  let y = 0.0;

  let lastY = 0;

  for (i = 0; i < screen_width; i++) {

    let expo = y;

    if(stage == 0) {

      y += a;

      if (y >= 1) {

        stage = 1;

        y= 1;

      }

      expo = expoCalc(0, 2.5, y);

    } else if (stage == 1) {

      y -= d;      

      expo = (expoCalc(6, 0, 1-y) * (1-s)) + s;

      if (expo - s < .0001) stage = 2;

    } else if (stage == 2) {

      y = s;

      expo = s;

      if (s_count++ >= 10) stage = 3;

    } else if (stage == 3) {

      y -= r;

      if (y < .0001) stage = 4;

      expo = expoCalc(6, 0, 1-y/s)*s;

    }

    //point(i, ((1.1-y)*500));

    //stroke(0,0,0);

    //point(i, ((1.1-expo)*500));

    line (i-1, (1.1-lastY)*500, i, (1.1-expo)*500);

    lastY = expo;

  }

}