circle.js

circle.js

function circle(radius) {
  radius = radius || (-1*radius) || 1;

  const quadrant1 = [];
  const quadrant2 = [];
  const quadrant3 = [];
  const quadrant4 = [];

  const DEGREE = radius / 90;
  for(let x=0; x <= radius; x+=DEGREE) {
    let y = cosine(radius, x);
    let xNegative = x === 0 ? 0 : (-1*x);
    let yNegative = y === 0 ? 0 : (-1*y);
    
    quadrant1.push({ x, y });
    quadrant2.push({ x: xNegative, y });
    quadrant3.push({ x: xNegative, y: yNegative });
    quadrant4.push({ x, y: yNegative });
  }

  return { quadrant1, quadrant2, quadrant3, quadrant4 }
}

// Find Y (i.e. opposite/cosine) on a (X,Y) 2-dimentional graph... 
// Given the hypotenuse (i.e. radius) and the X (i.e. adjacent/sine)
function cosine(hypotenuse, adjacent) {
  let c = (hypotenuse**2);
  let a = (adjacent**2);
  let b = ((c - a)**(1/2));
  return b;
}

console.log({ radius7: circle(7), radius11: circle(11) })