Function drag_start

js/src/ScatterBase.ts:646–661

(d, i, dragged_node)

  reset_drag_style(d, i, dragged_node) {}

  drag_start(d, i, dragged_node) {
    // d[0] and d[1] will contain the previous position (in pixels)
    // of the dragged point, for the length of the drag event
    const x_scale = this.scales.x,
      y_scale = this.scales.y;
    d[0] = x_scale.scale(d.x) + x_scale.offset;
    d[1] = y_scale.scale(d.y) + y_scale.offset;

    this.set_drag_style(d, i, dragged_node);

    this.send({
      event: 'drag_start',
      point: { x: d.x, y: d.y },
      index: i,
    });
  }

  on_drag(d, i, dragged_node) {
    const x_scale = this.scales.x,