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  ./source/core/animation-loop.js ./source/core/display-cycle.js ./source/core/document-root-elements.js ./source/core/document.js ./source/core/events.js ./source/core/init.js ./source/core/library.js ./source/core/random-seed.js ./source/core/shared-vars.js ./source/core/snippets.js ./source/core/system-flags.js ./source/core/user-interaction.js ./source/core/utilities.js ./source/factory/action.js ./source/factory/anchor.js ./source/factory/animation.js ./source/factory/array-pool.js ./source/factory/bezier.js ./source/factory/block.js ./source/factory/canvas.js ./source/factory/cell-fragment.js ./source/factory/cell.js ./source/factory/cog.js ./source/factory/color.js ./source/factory/conic-gradient.js ./source/factory/coordinate.js ./source/factory/crescent.js ./source/factory/drag-zone.js ./source/factory/element.js ./source/factory/emitter.js ./source/factory/filter-engine-bluenoise-data.js ./source/factory/filter-engine.js ./source/factory/filter.js ./source/factory/font-attributes.js ./source/factory/gradient.js ./source/factory/grid.js ./source/factory/group.js ./source/factory/image-asset.js ./source/factory/keyboard-zone.js ./source/factory/line-spiral.js ./source/factory/line.js ./source/factory/loom.js ./source/factory/mesh.js ./source/factory/net.js ./source/factory/noise-asset.js ./source/factory/observe-update.js ./source/factory/oval.js ./source/factory/palette.js ./source/factory/particle-force.js ./source/factory/particle-history.js ./source/factory/particle-spring.js ./source/factory/particle-world.js ./source/factory/particle.js ./source/factory/pattern.js ./source/factory/phrase.js ./source/factory/picture.js ./source/factory/polygon.js ./source/factory/polyline.js ./source/factory/quadratic.js ./source/factory/quaternion.js ./source/factory/radial-gradient.js ./source/factory/raw-asset.js ./source/factory/reaction-diffusion-asset.js ./source/factory/rectangle.js ./source/factory/render-animation.js ./source/factory/shape.js ./source/factory/spiral.js ./source/factory/sprite-asset.js ./source/factory/stack.js ./source/factory/star.js ./source/factory/state.js ./source/factory/tetragon.js ./source/factory/ticker.js ./source/factory/tracer.js ./source/factory/tween.js ./source/factory/unstacked-element.js ./source/factory/vector.js ./source/factory/video-asset.js ./source/factory/wheel.js ./source/mixin/anchor.js ./source/mixin/asset-advanced-functionality.js ./source/mixin/asset-consumer.js ./source/mixin/asset.js ./source/mixin/base.js ./source/mixin/cascade.js ./source/mixin/cell-key-functions.js ./source/mixin/delta.js ./source/mixin/display-shape.js ./source/mixin/dom.js ./source/mixin/entity.js ./source/mixin/filter.js ./source/mixin/mimic.js ./source/mixin/path.js ./source/mixin/pattern.js ./source/mixin/pivot.js ./source/mixin/position.js ./source/mixin/shape-basic.js ./source/mixin/shape-curve.js ./source/mixin/shape-path-calculation.js ./source/mixin/styles.js ./source/mixin/tween.js

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  # Root elements

  `Exported array and function` (to modules). Root elements are the boxes whose dimensions define the dimensions and positioning of all that they contain. All <canvas> elements are root elements. Scrawl-canvas also allows other DOM elements (typically <div> elements) to be defined as root elements called stacks, whose child elements can then be positioned and dimensioned just like entity objects in a canvas.

  Stacks can be nested within each other, and canvases can also be nested inside a stack. (Nothing can nest inside a canvas element). Only the top level stack will be included in the rootElements array.

  The Scrawl-canvas Display cycle can start at the rootElements array, with each member of the array processed in turn.

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  #### Imports

      import { artefact } from "./library.js";

      import { getRootElementsSort, setRootElementsSort } from './system-flags.js';

      import { pushUnique, removeItem } from './utilities.js';

      import { releaseArray, requestArray } from '../factory/array-pool.js';

      import { _floor } from './shared-vars.js';

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  #### Local variables

      const rootElements = [];
      const rootElements_sorted = [];

      export const rootElementsAdd = (val) => {
          pushUnique(rootElements, val);
          setRootElementsSort(true);
      };

      export const rootElementsRemove = (val) => {
          removeItem(rootElements, val);
          setRootElementsSort(true);
      };

      export const rootElementsIncludes = (val) => rootElements.includes(val);

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  #### Functionality

      export const getSortedRootElements = () => {

          if (getRootElementsSort()) sortRootElements();
          return rootElements_sorted;
      };

      const sortRootElements = function () {

          setRootElementsSort(false);

          const buckets = requestArray();

          let obj, order, i, iz;

          for (i = 0, iz = rootElements.length; i < iz; i++) {

              obj = artefact[rootElements[i]];

              if (obj) {

                  order = _floor(obj.order) || 0;

                  if (!buckets[order]) buckets[order] = requestArray();

                  buckets[order].push(obj.name);
              }
          }
          rootElements_sorted.length = 0;

          for (i = 0, iz = buckets.length; i < iz; i++) {

              obj = buckets[i];

              if (obj) {

                  rootElements_sorted.push(...obj);
                  releaseArray(obj);
              }
          }
          releaseArray(buckets);
      };