let vertices = []

let nv = 5

let edges = [[0,1], [0,2], [0,3], [1,3], [3,4]]

let a,b

​

class vx {

  constructor(x, y, label) {

    this.pos = createVector(x, y)

    this.name = label

    this.deg = 0

    this.par = -1

  }

  show() {

    push()

    strokeWeight(5)

    translate(width/2, 20)

    point(this.pos.x, this.pos.y)

    pop()

  }

}

​

function setup() {

  createCanvas(400, 400);

  for (let i=0;i<nv;i++) {

    vertices.push(new vx(0,i*100,i))

  }

  for (let i=0;i<edges.length;i++) {

    let ct = 0

    for (let e of edges) {

      ct += e[0]==i 

      ct += e[1]==i

    }

    vertices[i].deg = ct

  }

}

​

function draw() {

  background(240);

  for (let v of vertices) {

    v.show()

  }

  for (let e of edges) {

    a = vertices[e[0]]

    b = vertices[e[1]]

    push()

    translate(width/2, 20)

    line(a.pos.x, a.pos.y, b.pos.x, b.pos.y)

    pop()

  }

}