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  # Mimic mixin

  This mixin defines additional attributes and functions to allow an artefact to use a range of attribute 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 { MIMIC, START, T_CELL, 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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  mimic - reference artefact object. Can also be set using the artefact’s name-String.

              mimic: ZERO_STR,

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  useMimic… - a set of Boolean flags determining which attributes should be taken from the mimic reference artefact. By default, the artefact will use its own attribute values; setting any of these flags changes the behaviour for that attribute.

              useMimicDimensions: false,
              useMimicScale: false,
              useMimicStart: false,
              useMimicHandle: false,
              useMimicOffset: false,
              useMimicRotation: false,
              useMimicFlip: false,

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  addOwn…ToMimic - a set of Boolean flags determining which mimic attributes should be added to this artefact’s own attribute values. By default, none are added; setting any of these flags changes the behaviour for that attribute.

              addOwnDimensionsToMimic: false,
              addOwnScaleToMimic: false,
              addOwnStartToMimic: false,
              addOwnHandleToMimic: false,
              addOwnOffsetToMimic: false,
              addOwnRotationToMimic: false,
          };
          P.defs = mergeOver(P.defs, defaultAttributes);
          mergeOver(P, defaultAttributes);

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  #### Packet management

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

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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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  mimic

          S.mimic = function (item) {

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

                  this.mimic = null;

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

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

                  const oldMimic = this.mimic,
                      name = this.name;

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

                  if (!newMimic) {

                      newMimic = asset[item];

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

                  if (newMimic && newMimic.name) {

                      if (oldMimic && oldMimic.name != newMimic.name) removeItem(oldMimic.mimicked, name);

                      pushUnique(newMimic.mimicked, name);

                      this.mimic = newMimic;

                      if (this.useMimicDimensions) this.dirtyDimensions = true;
                      if (this.useMimicScale) this.dirtyScale = true;
                      if (this.useMimicStart) this.dirtyStart = true;
                      if (this.useMimicHandle) this.dirtyHandle = true;
                      if (this.useMimicOffset) this.dirtyOffset = true;
                      if (this.useMimicRotation) this.dirtyRotation = true;
                  }
              }
          };

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  useMimicDimensions, useMimicScale, useMimicStart, useMimicHandle, useMimicOffset, useMimicRotation

          S.useMimicDimensions = function (item) {

              this.useMimicDimensions = item;
              this.dirtyDimensions = true;
          };
          S.useMimicScale = function (item) {

              this.useMimicScale = item;
              this.dirtyScale = true;
          };
          S.useMimicStart = function (item) {

              this.useMimicStart = item;
              this.dirtyStart = true;
          };
          S.useMimicHandle = function (item) {

              this.useMimicHandle = item;
              this.dirtyHandle = true;
          };
          S.useMimicOffset = function (item) {

              this.useMimicOffset = item;
              this.dirtyOffset = true;
          };
          S.useMimicRotation = function (item) {

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

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  addOwnDimensionsToMimic, addOwnScaleToMimic, addOwnStartToMimic, addOwnHandleToMimic, addOwnOffsetToMimic, addOwnRotationToMimic

          S.addOwnDimensionsToMimic = function (item) {

              this.addOwnDimensionsToMimic = item;
              this.dirtyDimensions = true;
          };
          S.addOwnScaleToMimic = function (item) {

              this.addOwnScaleToMimic = item;
              this.dirtyScale = true;
          };
          S.addOwnStartToMimic = function (item) {

              this.addOwnStartToMimic = item;
              this.dirtyStart = true;
          };
          S.addOwnHandleToMimic = function (item) {

              this.addOwnHandleToMimic = item;
              this.dirtyHandle = true;
          };
          S.addOwnOffsetToMimic = function (item) {

              this.addOwnOffsetToMimic = item;
              this.dirtyOffset = true;
          };
          S.addOwnRotationToMimic = function (item) {

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

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  #### Prototype functions

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  `updateMimicSubscribers`

          P.updateMimicSubscribers = function () {

              const DMH = this.dirtyMimicHandle,
                  DMO = this.dirtyMimicOffset,
                  DMR = this.dirtyMimicRotation,
                  DMS = this.dirtyMimicScale,
                  DMD = this.dirtyMimicDimensions;

              let m;

              this.mimicked.forEach(name => {

                  m = artefact[name];

                  if (!m) {

                      m = asset[name];

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

                  if (m) {

                      if (m.useMimicStart) m.dirtyStart = true;
                      if (DMH && m.useMimicHandle) m.dirtyHandle = true;
                      if (DMO && m.useMimicOffset) m.dirtyOffset = true;
                      if (DMR && m.useMimicRotation) m.dirtyRotation = true;
                      if (DMS && m.useMimicScale) m.dirtyScale = true;
                      if (DMD && m.useMimicDimensions) m.dirtyDimensions = true;
                  }
              });

              this.dirtyMimicHandle = false;
              this.dirtyMimicOffset = false;
              this.dirtyMimicRotation = false;
              this.dirtyMimicScale = false;
              this.dirtyMimicDimensions = false;
          };
      }