var d2;//= createVector(300,200);

var c;

var r = 10;

​

function setup() {

  createCanvas(400, 400);

  d1 = createVector(200,500);

  d2 = createVector(300,200);

}

​

function draw() {

  c = createVector(mouseX,mouseY);

  intersection(d1,d2,c,r);

  background(220);

  line(d1.x,d1.y,d2.x,d2.y)

  noFill();

  circle(c.x,c.y,r);

}

​

function intersection(d1,d2,ct,r){

  let x0 = ct.x;

  let y0 = ct.y;

  let x1 = d1.x;

  let y1 = d1.y;

  let x2 = d2.x;

  let y2 = d2.y;

  let ra = r/2;

  let nom = abs((y1 - y2) * x0 + (x2 - x1) * y0 + x1 * y2 - x2 * y1);

  let dem = sqrt((x2 - x1)**2 + (y2 - y1)**2);

  let dis = nom/dem;

  console.log(dis,ra,x0,x1)

  if(dis <= ra && (x0 > x1 && x0 < x2 || y0 > y1 && y0 < y2)){

      console.log("Inside")

  }else{

    console.log("outside")

  }

}