let xMax = 200;

let yMin = -200;

let yMax = 200;

let xScale = 1;

let yScale = 1;

​

function setup() {

  createCanvas(400, 400);

  xScale = width / ()

}

​

function draw() {

  background(220);

  strokeWeight(3);

  translate(width/2, height/2);

  scale(1, -1);

  stroke(0);

  point(0, 0);

  stroke('red');

  point(100, 100);

  stroke('blue');

  point(-100, -100);

  // axes

  stroke(0);

  strokeWeight(1);

  line(-width/2, 0, width/2, 0);  //x-axis

  line(0, height/2, 0, -height/2);  //y-axis

  graphF();

}

​

// f(x) = ???

function graphF() {

  for(let x = -width/2; x <= width/2; x += 0.01) {

    let y = x*x;  //f(x) = x^2

    point(x, y);

  }

}