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  ./demo/canvas-001.js ./demo/canvas-002.js ./demo/canvas-003.js ./demo/canvas-004.js ./demo/canvas-005.js ./demo/canvas-006.js ./demo/canvas-007.js ./demo/canvas-008.js ./demo/canvas-009.js ./demo/canvas-010.js ./demo/canvas-011.js ./demo/canvas-012.js ./demo/canvas-013.js ./demo/canvas-014.js ./demo/canvas-015.js ./demo/canvas-015a.js ./demo/canvas-016.js ./demo/canvas-017.js ./demo/canvas-018.js ./demo/canvas-019.js ./demo/canvas-019a.js ./demo/canvas-020.js ./demo/canvas-021.js ./demo/canvas-022.js ./demo/canvas-023.js ./demo/canvas-024.js ./demo/canvas-025.js ./demo/canvas-026.js ./demo/canvas-027.js ./demo/canvas-028.js ./demo/canvas-029.js ./demo/canvas-030.js ./demo/canvas-031.js ./demo/canvas-032.js ./demo/canvas-033.js ./demo/canvas-034.js ./demo/canvas-035.js ./demo/canvas-036.js ./demo/canvas-037.js ./demo/canvas-038.js ./demo/canvas-039.js ./demo/canvas-040.js ./demo/canvas-041.js ./demo/canvas-042.js ./demo/canvas-043.js ./demo/canvas-044.js ./demo/canvas-045.js ./demo/canvas-046.js ./demo/canvas-047.js ./demo/canvas-048.js ./demo/canvas-049.js ./demo/canvas-050.js ./demo/canvas-051.js ./demo/canvas-052.js ./demo/canvas-053.js ./demo/canvas-054.js ./demo/canvas-055.js ./demo/canvas-056.js ./demo/canvas-058.js ./demo/canvas-059.js ./demo/canvas-060.js ./demo/canvas-061.js ./demo/canvas-062.js ./demo/canvas-063.js ./demo/canvas-064.js ./demo/core-001.js ./demo/delaunator-001.js ./demo/delaunator-002.js ./demo/dom-001.js ./demo/dom-002.js ./demo/dom-003.js ./demo/dom-004.js ./demo/dom-005.js ./demo/dom-006.js ./demo/dom-007.js ./demo/dom-008.js ./demo/dom-009.js ./demo/dom-010.js ./demo/dom-011.js ./demo/dom-012.js ./demo/dom-013.js ./demo/dom-015.js ./demo/dom-016.js ./demo/dom-017.js ./demo/dom-018.js ./demo/filters-001.js ./demo/filters-002.js ./demo/filters-002a.js ./demo/filters-003.js ./demo/filters-004.js ./demo/filters-005.js ./demo/filters-006.js ./demo/filters-007.js ./demo/filters-008.js ./demo/filters-009.js ./demo/filters-010.js ./demo/filters-011.js ./demo/filters-012.js ./demo/filters-013.js ./demo/filters-014.js ./demo/filters-015.js ./demo/filters-016.js ./demo/filters-017.js ./demo/filters-018.js ./demo/filters-019.js ./demo/filters-020.js ./demo/filters-021.js ./demo/filters-022.js ./demo/filters-023.js ./demo/filters-024.js ./demo/filters-025.js ./demo/filters-026.js ./demo/filters-027.js ./demo/filters-028.js ./demo/filters-101.js ./demo/filters-102.js ./demo/filters-103.js ./demo/filters-104.js ./demo/filters-105.js ./demo/filters-501.js ./demo/filters-502.js ./demo/filters-503.js ./demo/filters-504.js ./demo/filters-505.js ./demo/mediapipe-001.js ./demo/mediapipe-002.js ./demo/mediapipe-003.js ./demo/modules-001.js ./demo/modules-002.js ./demo/modules-003.js ./demo/modules-004.js ./demo/modules-005.js ./demo/modules-006.js ./demo/packets-001.js ./demo/packets-002.js ./demo/particles-001.js ./demo/particles-002.js ./demo/particles-003.js ./demo/particles-004.js ./demo/particles-005.js ./demo/particles-006.js ./demo/particles-007.js ./demo/particles-008.js ./demo/particles-009.js ./demo/particles-010.js ./demo/particles-011.js ./demo/particles-012.js ./demo/particles-013.js ./demo/particles-014.js ./demo/particles-015.js ./demo/particles-016.js ./demo/rapier-001.js ./demo/snippets-001.js ./demo/snippets-002.js ./demo/snippets-003.js ./demo/snippets-004.js ./demo/snippets-005.js ./demo/snippets-006.js ./demo/tensorflow-001.js ./demo/tensorflow-002.js ./demo/utilities.js

- §

  # Demo Canvas 022

  Grid entity - basic functionality (color, gradients)

- §

  Run code

      import * as scrawl from '../source/scrawl.js'

      import { reportSpeed } from './utilities.js';

- §

  #### Scene setup

  Get a handle to the Canvas wrapper

      const canvas = scrawl.library.artefact.mycanvas;

- §

  Namespacing boilerplate

      const namespace = 'demo';
      const name = (n) => `${namespace}-${n}`;

- §

  Create gradients

      const cellGradient = scrawl.makeGradient({
          name: name('blue-green'),
          endX: '100%',
          colors: [
              [0, 'blue'],
              [500, 'gold'],
              [999, 'green']
          ],
          colorSpace: 'OKLAB',
      });

      const gridGradient = scrawl.makeGradient({
          name: name('red-blue'),
          endX: '100%',
          endY: '100%',
          colors: [
              [0, 'red'],
              [500, 'gold'],
              [999, 'lightblue']
          ],
          colorSpace: 'OKLAB',
      });

- §

  Define Grid `tileSource` Array objects

      const blueSource = {
          type: 'color',
          source: 'aliceblue',
      };

      const redSource = {
          type: 'color',
          source: 'red',
      };

      const cellGradientSource = {
          type: 'cellGradient',
          source: cellGradient,
      };

      const gridGradientSource = {
          type: 'gridGradient',
          source: gridGradient,
      };

- §

  Create the Grid entity

      const myGrid = scrawl.makeGrid({

          name: name('test-grid'),

          startX: 'center',
          startY: 'center',

          handleX: 'center',
          handleY: 'center',

          width: 300,
          height: 200,

          columns: 6,
          rows: 6,

          tileSources: [blueSource, redSource]
      });

- §

  #### User interaction

  Function to check for mouse position hits over the Grid entity, and adapt it accordingly

      let hitReport = '';
      const checkHitTiles = () => {

          const hits = myGrid.checkHit(canvas.here);

          myGrid.setAllTilesTo(0);

          if (typeof hits !== 'boolean' && hits) {

              myGrid.setTilesTo(hits.tiles, 1);
              hitReport = `Hits - x: ${hits.x}, y: ${hits.y}, tiles: ${hits.tiles.join(', ')}`;
          }
          else hitReport = 'Hits - none reported';
      };

- §

  For this demo we will suppress touchmove functionality over the canvas

      scrawl.addNativeListener('touchmove', (e) => {

          e.preventDefault();
          e.returnValue = false;

      }, canvas.domElement);

- §

  #### Scene animation

  Function to display frames-per-second data, and other information relevant to the demo

      const report = reportSpeed('#reportmessage', function () {

          const [startX, startY] = myGrid.start;
          const [handleX, handleY] = myGrid.handle;
          const [offsetX, offsetY] = myGrid.offset;
          const [width, height] = myGrid.dimensions;

          const here = canvas.here;

          const {roll, scale, columns, rows, columnGutterWidth, rowGutterWidth} = myGrid;

          return `    Grid - columns: ${columns.toFixed(0)}; rows: ${rows.toFixed(0)}
          Grid dimensions - width: ${width}; height: ${height}
          Grid gutter widths - column: ${columnGutterWidth.toFixed(0)}; row: ${rowGutterWidth.toFixed(0)}
          Start - x: ${startX}, y: ${startY}
          Handle - x: ${handleX}, y: ${handleY}
          Offset - x: ${offsetX}, y: ${offsetY}
          Roll: ${roll}; Scale: ${scale}
          canvas.here - x: ${here.x.toFixed(0)}, y: ${here.y.toFixed(0)}; ${hitReport}`;
      });

- §

  Create the Display cycle animation

      scrawl.makeRender({

          name: name('animation'),
          target: canvas,
          commence: checkHitTiles,
          afterShow: report,
      });

- §

  #### More user interaction

  Setup form observer functionality

      scrawl.makeUpdater({

          event: ['input', 'change'],
          origin: '.controlItem',

          target: myGrid,

          useNativeListener: true,
          preventDefault: true,

          updates: {

              columns: ['columns', 'round'],
              rows: ['rows', 'round'],

              relativeWidth: ['width', '%'],
              absoluteWidth: ['width', 'round'],

              relativeHeight: ['height', '%'],
              absoluteHeight: ['height', 'round'],

              columnGutter: ['columnGutterWidth', 'float'],
              rowGutter: ['rowGutterWidth', 'float'],

              start_xPercent: ['startX', '%'],
              start_xAbsolute: ['startX', 'round'],
              start_xString: ['startX', 'raw'],

              start_yPercent: ['startY', '%'],
              start_yAbsolute: ['startY', 'round'],
              start_yString: ['startY', 'raw'],

              handle_xPercent: ['handleX', '%'],
              handle_xAbsolute: ['handleX', 'round'],
              handle_xString: ['handleX', 'raw'],

              handle_yPercent: ['handleY', '%'],
              handle_yAbsolute: ['handleY', 'round'],
              handle_yString: ['handleY', 'raw'],

              offset_xPercent: ['offsetX', '%'],
              offset_xAbsolute: ['offsetX', 'round'],

              offset_yPercent: ['offsetY', '%'],
              offset_yAbsolute: ['offsetY', 'round'],

              roll: ['roll', 'float'],
              scale: ['scale', 'float'],

              upend: ['flipUpend', 'boolean'],
              reverse: ['flipReverse', 'boolean'],
          },
      });

      const updateBaseFill = (e) => {

          e.preventDefault();
          e.returnValue = false;

          const val = e.target.value;

          switch (val) {

              case 'blueSource' :
                  myGrid.setTileSourceTo(0, blueSource);
                  break;

              case 'redSource' :
                  myGrid.setTileSourceTo(0, redSource);
                  break;

              case 'cellGradientSource' :
                  myGrid.setTileSourceTo(0, cellGradientSource);
                  break;

              case 'gridGradientSource' :
                  myGrid.setTileSourceTo(0, gridGradientSource);
                  break;
          }
      };
      scrawl.addNativeListener(['input', 'change'], updateBaseFill, '#baseFill');

      const updateHighlightFill = (e) => {

          e.preventDefault();
          e.returnValue = false;

          const val = e.target.value;

          switch (val) {

              case 'blueSource' :
                  myGrid.setTileSourceTo(1, blueSource);
                  break;

              case 'redSource' :
                  myGrid.setTileSourceTo(1, redSource);
                  break;

              case 'cellGradientSource' :
                  myGrid.setTileSourceTo(1, cellGradientSource);
                  break;

              case 'gridGradientSource' :
                  myGrid.setTileSourceTo(1, gridGradientSource);
                  break;
          }
      };
      scrawl.addNativeListener(['input', 'change'], updateHighlightFill, '#highlightFill');

      const updateGridStroke = (e) => {

          e.preventDefault();
          e.returnValue = false;

          const val = e.target.value;

          switch (val) {

              case 'base' :
                  myGrid.set({
                      gutterColor: 0
                  });
                  break;

              case 'highlight' :
                  myGrid.set({
                      gutterColor: 1
                  });
                  break;

              case 'blueSource' :
                  myGrid.set({
                      gutterColor: blueSource
                  });
                  break;

              case 'redSource' :
                  myGrid.set({
                      gutterColor: redSource
                  });
                  break;

              case 'cellGradientSource' :
                  myGrid.set({
                      gutterColor: cellGradientSource
                  });
                  break;

              case 'gridGradientSource' :
                  myGrid.set({
                      gutterColor: gridGradientSource
                  });
                  break;

              default :
                  myGrid.set({
                      gutterColor: '#808080'
                  });
          }
          console.log(myGrid.saveAsPacket());
      };
      scrawl.addNativeListener(['input', 'change'], updateGridStroke, '#gridStroke');

- §

  Setup form @ts-expect-error

      document.querySelector('#columns').value = 6;

- §

  @ts-expect-error

      document.querySelector('#rows').value = 6;

- §

  @ts-expect-error

      document.querySelector('#columnGutter').value = 1;

- §

  @ts-expect-error

      document.querySelector('#rowGutter').value = 1;

- §

  @ts-expect-error

      document.querySelector('#relativeWidth').value = 50;

- §

  @ts-expect-error

      document.querySelector('#absoluteWidth').value = 300;

- §

  @ts-expect-error

      document.querySelector('#relativeHeight').value = 50;

- §

  @ts-expect-error

      document.querySelector('#absoluteHeight').value = 200;

- §

  @ts-expect-error

      document.querySelector('#baseFill').options.selectedIndex = 0;

- §

  @ts-expect-error

      document.querySelector('#highlightFill').options.selectedIndex = 1;

- §

  @ts-expect-error

      document.querySelector('#gridStroke').options.selectedIndex = 0;

- §

  @ts-expect-error

      document.querySelector('#start_xPercent').value = 50;

- §

  @ts-expect-error

      document.querySelector('#start_yPercent').value = 50;

- §

  @ts-expect-error

      document.querySelector('#handle_xPercent').value = 50;

- §

  @ts-expect-error

      document.querySelector('#handle_yPercent').value = 50;

- §

  @ts-expect-error

      document.querySelector('#start_xAbsolute').value = 300;

- §

  @ts-expect-error

      document.querySelector('#start_yAbsolute').value = 200;

- §

  @ts-expect-error

      document.querySelector('#handle_xAbsolute').value = 150;

- §

  @ts-expect-error

      document.querySelector('#handle_yAbsolute').value = 100;

- §

  @ts-expect-error

      document.querySelector('#start_xString').options.selectedIndex = 1;

- §

  @ts-expect-error

      document.querySelector('#start_yString').options.selectedIndex = 1;

- §

  @ts-expect-error

      document.querySelector('#handle_xString').options.selectedIndex = 1;

- §

  @ts-expect-error

      document.querySelector('#handle_yString').options.selectedIndex = 1;

- §

  @ts-expect-error

      document.querySelector('#offset_xPercent').value = 0;

- §

  @ts-expect-error

      document.querySelector('#offset_yPercent').value = 0;

- §

  @ts-expect-error

      document.querySelector('#offset_xAbsolute').value = 0;

- §

  @ts-expect-error

      document.querySelector('#offset_yAbsolute').value = 0;

- §

  @ts-expect-error

      document.querySelector('#roll').value = 0;

- §

  @ts-expect-error

      document.querySelector('#scale').value = 1;

- §

  @ts-expect-error

      document.querySelector('#upend').options.selectedIndex = 0;

- §

  @ts-expect-error

      document.querySelector('#reverse').options.selectedIndex = 0;

- §

  #### Development and testing

  TODO: need to develop a test for killing and resurrecting the Grid entity

      console.log(scrawl.library);