anchor.diff:            constructor() {
                 this.particle = new Konva.Circle({
                     x: 150,
  -                  y: 350,
  +                  y: 250,
                     radius: 12,
                     fill: 'red',
                     draggable: true
  
positive.code:       let part = new Particle();
        part.draw();
  
        let puntos = [part.getPart().x(), part.getPart().y()];
        let line = new Konva.Line({
            points: puntos,
            stroke: 'darkred',
            strokeWidth: 2,
            lineJoin: 'round',
            lineCap: 'round',
            tension: 1
        });
        layer.add(line);
  
  
        /* ANIMACIN PARTICULA */
  
negative.code:               return this.velocity;
            }
  
            //Dibujar
            draw() {
                layer.add(this.particle);
  