let m1 = 10, m2 = 10;

let a1 = 0, a2 = 0;

let a1_v = 0, a2_v = 0;

let a1_a = 0, a2_a = 0;

let g = 0.9;

let cx, cy;

let buffer, px2 = -1, py2 = -1;

​

function setup() {

  createCanvas(800, 600);

  pixelDensity(1);

  a1 = PI / 2;

  a2 = PI / 2;

  cx = width / 2;

  cy = height / 2;

  buffer = createGraphics(width, height);

  buffer.background(255);

  buffer.translate(cx, cy);

}

​

function draw() {

  formula();

  background(255);

  imageMode(CORNER);

  image(buffer, 0, 0, width, height);

  translate(cx, cy);

  stroke(0);

  strokeWeight(1);

  render();

}