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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 DOM 002

  Element mouse, pivot and mimic functionality

- §

  Run code

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

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

- §

  #### Scene setup

  Create some useful variables for use elsewhere in the script

      const artefact = scrawl.library.artefact,
          stack = artefact.mystack,
          element = artefact.myelement,
          mimic = artefact.mymimic,
          pivot = artefact.mypivot;

- §

  Give the stack element some depth

      stack.set({
          perspectiveZ: 1200
      });

- §

  Setup the main element

      element.set({
          startX: 250,
          startY: 250,
          handleX: 125,
          handleY: 125,
          width: 250,
          height: 250,
          roll: 10,
          pitch: 20,
          yaw: 30
      });

- §

  Setup the mimic element

      mimic.set({
          width: 20,
          height: 20,
          offsetX: 60,

          roll: 15,
          pitch: 15,
          yaw: 15,

          mimic: 'myelement',
          lockTo: 'mimic',

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

          addOwnDimensionsToMimic: true,
          addOwnScaleToMimic: false,
          addOwnStartToMimic: false,
          addOwnHandleToMimic: false,
          addOwnOffsetToMimic: true,
          addOwnRotationToMimic: false,
      });

- §

  Setup the pivot element

      pivot.set({
          pivot: 'myelement',
          lockTo: 'pivot',
      });

- §

  #### Scene animation

  Function to check whether mouse cursor is over stack, and lock the element artefact accordingly

      const stackCheck = function () {

          let active = false;

          return function () {

              if (stack.here.active !== active) {

                  active = stack.here.active;

                  element.set({
                      lockTo: (active) ? 'mouse' : 'start'
                  });
              }
          };
      }();

- §

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

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

          const [width, height] = element.dimensions;
          const [startX, startY] = element.start;
          const [handleX, handleY] = element.handle;

          const lockTo = element.lockTo.join(', ');

          const {roll, pitch, yaw, scale} = element;

          return `    lock to: «${lockTo}»
          dimensions - width: ${width}, height: ${height}
          start - x: ${startX}, y: ${startY}
          handle - x: ${handleX}, y: ${handleY}
          scale: ${scale}
          roll: ${roll}°, pitch: ${pitch}°, yaw: ${yaw}°`;
      });

- §

  Create the Display cycle animation

      scrawl.makeRender({

          name: 'demo-animation',
          target: stack,
          commence: stackCheck,
          afterShow: report,
      });

- §

  #### User interaction

  For this demo we will suppress touchmove functionality over the canvas; we also need to disable Android magnification gesture - this is done in CSS with `touch-action: none;` - note: dragging issue does not affect Demo DOM-008

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

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

      }, stack.domElement);

- §

  Setup form observer functionality

      scrawl.makeUpdater({

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

          target: element,

          useNativeListener: true,
          preventDefault: true,

          updates: {

              dims_widthPercent: ['width', '%'],
              dims_widthAbsolute: ['width', 'round'],

              dims_heightPercent: ['height', '%'],
              dims_heightAbsolute: ['height', 'round'],

              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'],

              roll: ['roll', 'float'],
              pitch: ['pitch', 'float'],
              yaw: ['yaw', 'float'],
              scale: ['scale', 'float'],
          },
      });

- §

  `target` doesn’t have to be a Scrawl-canvas object. We can use the object’s name, though we also have to tell the function where the object lives in the Scrawl-canvas library (usually this will be ‘artefact’)

      scrawl.makeUpdater({

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

          target: 'mypivot',
          targetLibrarySection: 'artefact',

          useNativeListener: true,
          preventDefault: true,

          updates: {

              pivot_handle: ['addPivotHandle', 'boolean'],
              pivot_rotation: ['addPivotRotation', 'boolean'],
          },
      });

- §

  Using the Scrawl-canvas listener functions directly, in this case because we want to update more than one attribute in a single set action, which the makeUpdater function cannot do (because: too much of an edge case to handle)

      const events = (e) => {

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

          switch (e.target.id) {

              case 'mimic_dims':
                  mimic.set({
                      width: parseFloat(e.target.value),
                      height: parseFloat(e.target.value),
                  });
                  break;

              case 'mimic_rotation':
                  mimic.set({
                      addOwnRotationToMimic: (e.target.value === '1') ? true : false,
                  });
                  break;
          }
      };
      scrawl.addNativeListener(['input', 'change'], events, '.controlItem');

- §

  Housekeeping - set the DOM input values to their starting values on each page reload @ts-expect-error

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

- §

  @ts-expect-error

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

- §

  @ts-expect-error

      document.querySelector('#dims_widthAbsolute').value = 250;

- §

  @ts-expect-error

      document.querySelector('#dims_heightAbsolute').value = 250;

- §

  @ts-expect-error

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

- §

  @ts-expect-error

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

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  @ts-expect-error

      document.querySelector('#start_xAbsolute').value = 250;

- §

  @ts-expect-error

      document.querySelector('#start_yAbsolute').value = 250;

- §

  @ts-expect-error

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

- §

  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

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

- §

  @ts-expect-error

      document.querySelector('#handle_xAbsolute').value = 125;

- §

  @ts-expect-error

      document.querySelector('#handle_yAbsolute').value = 125;

- §

  @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('#roll').value = 10;

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  @ts-expect-error

      document.querySelector('#pitch').value = 20;

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  @ts-expect-error

      document.querySelector('#yaw').value = 30;

- §

  @ts-expect-error

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

- §

  @ts-expect-error

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

- §

  @ts-expect-error

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

- §

  @ts-expect-error

      document.querySelector('#mimic_dims').value = 10;

- §

  @ts-expect-error

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

- §

  #### Development and testing

      console.log(scrawl.library);