code: function GraphNode() {
          this.position = new Float32Array(2);
  
          this.force = vec2.create();
          this.forcePrev = vec2.create();
  
          // If repulsionByDegree is true
          //  mass = inDegree + outDegree + 1
          // Else
          //  mass is manually set
          this.mass = 1;
  
          this.inDegree = 0;
          this.outDegree = 0;
  
          // Optional
          // this.size = 1;
      }
docs: **************************
  Class: Graph Node
  *************************