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  # Pivot mixin

  This mixin defines the attributes and functionality required by an artefact so that it can position and rotate itself using values set in another artefact.

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  #### Imports

      import { artefact, asset } from '../core/library.js';

      import { isa_boolean, mergeOver, pushUnique, removeItem, Ωempty } from '../core/utilities.js';

      import { CORNER_LABELS, PIVOT, START, T_BEZIER, T_CELL, T_LINE, T_POLYLINE, T_QUADRATIC, ZERO_STR } from '../core/shared-vars.js';

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  #### Export function

      export default function (P = Ωempty) {

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  #### Shared attributes

          const defaultAttributes = {

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  pivot - reference artefact object. Can also be set using the artefact’s name-String.

              pivot: ZERO_STR,

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  pivotCorner - Element artefacts allow other artefacts to use their corner positions as pivots, by setting this attribute to `topLeft`, `topRight`, `bottomRight` or `bottomLeft`; default is `''` to use the Element’s start coordinate.

              pivotCorner: ZERO_STR,

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  pivotPin - Polyline entitys are composed of a set of pin coordinates with the start being pin[0]; can reference other pins by setting this attribute to the appropriate index value (for example, the second pin will be pin[1]).

              pivotPin: 0,

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  addPivotHandle, addPivotOffset, addPivotRotation - Boolean flags. When set, the artifact will add its own values to the reference artefact’s values, rather than use them as replacement values.

              addPivotHandle: false,
              addPivotOffset: true,
              addPivotRotation: false,
          };
          P.defs = mergeOver(P.defs, defaultAttributes);
          mergeOver(P, defaultAttributes);

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  #### Packet management

          P.packetObjects = pushUnique(P.packetObjects, ['pivot']);

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  #### Clone management

  No additional clone functionality defined here

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  #### Kill management

  No additional kill functionality defined here

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  #### Get, Set, deltaSet

          const S = P.setters;

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  #### Prototype functions

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  pivot

          S.pivot = function (item) {

              if (isa_boolean(item) && !item) {

                  this.pivot = null;

                  if (this.lockTo[0] === PIVOT) this.lockTo[0] = START;
                  if (this.lockTo[1] === PIVOT) this.lockTo[1] = START;

                  this.dirtyStampPositions = true;
                  this.dirtyStampHandlePositions = true;
              }
              else {

                  const oldPivot = this.pivot,
                      name = this.name;

                  let newPivot = (item.substring) ? artefact[item] : item;

                  if (!newPivot) {

                      newPivot = asset[item];

                      if (newPivot && newPivot.type != T_CELL) newPivot = false;
                  }

                  if (newPivot && newPivot.name) {

                      if (oldPivot && oldPivot.name != newPivot.name) removeItem(oldPivot.pivoted, name);

                      pushUnique(newPivot.pivoted, name);

                      this.pivot = newPivot;
                      this.dirtyStampPositions = true;
                      this.dirtyStampHandlePositions = true;
                  }
              }
          };

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  pivotCorner

          S.pivotCorner = function (item) {

              if (CORNER_LABELS.includes(item)) this.pivotCorner = item;
          };

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  addPivotHandle, addPivotOffset, addPivotRotation

          S.addPivotHandle = function (item) {

              this.addPivotHandle = item;
              this.dirtyHandle = true;
          };
          S.addPivotOffset = function (item) {

              this.addPivotOffset = item;
              this.dirtyOffset = true;
          };
          S.addPivotRotation = function (item) {

              this.addPivotRotation = item;
              this.dirtyRotation = true;
          };

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  #### Prototype functions

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  `updatePivotSubscribers`

          P.updatePivotSubscribers = function () {

              let art;

              this.pivoted.forEach(name => {

                  art = artefact[name];

                  if (!art) {

                      art = asset[name];

                      if (!art || art.type !== T_CELL) art = false;
                  }

                  if (art) {

                      art.dirtyStart = true;
                      if (art.addPivotHandle) art.dirtyHandle = true;
                      if (art.addPivotOffset) art.dirtyOffset = true;
                      if (art.addPivotRotation) art.dirtyRotation = true;

                      if (art.type == T_POLYLINE) art.dirtyPins = true;
                      else if (art.type == T_LINE || art.type == T_QUADRATIC || art.type == T_BEZIER) art.dirtyPins.push(this.name);
                  }
              }, this);
          };
      }