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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 050

  Manipulate artefact delta animation values

- §

  Run code

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

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

- §

  #### Scene setup

      const canvas = scrawl.library.artefact.mycanvas;

- §

  Create a wheel entity which we can then bounce around the canvas

      const myWheel = scrawl.makeWheel({

          name: 'ball',

          start: [300, '50%'],
          handle: ['center', 'center'],

          radius: 60,
          startAngle: 35,
          endAngle: -35,

          fillStyle: '#f2aafe',
          strokeStyle: 'gold',
          lineWidth: 6,
          lineJoin: 'round',

          method: 'fillAndDraw',
          globalAlpha: 0.8,

          delta: {
              startX: 4,
              startY: '0.25%',
              roll: -0.5,
              globalAlpha: 0.006,
          },

- §

  We will check for bounds violations using Scrawl-canvas delta checking functionality

  - We supply an array for each delta attribute we want to check in the deltaConstraints Object
  - The Array holds three items: `[minimum-value, maximum-value, action-to-take]`
  - When the attribute updated by the delta value falls outside our boundaries, Scrawl-canvas takes the appropriate action
  - The reverse action will reverse the numerical sign of the affected delta object attribute value
  - The loop action will loop the artefact’s attribute value from the maximum to the minimum value, or vice-versa as appropriate

          deltaConstraints: {
              startX: [50, 550, 'reverse'],
              startY: ['10%', '90%', 'reverse'],
              scale: [0.5, 2, 'reverse'],
              globalAlpha: [0.2, 1, 'reverse'],
          },
          checkDeltaConstraints: true,
      });

      scrawl.makeOval({
          name: 'base-oval',
          start: ['center', 'center'],
          handle: ['center', 'center'],
          radiusX: 150,
          radiusY: 150,
          method: 'draw',
          lineWidth: 2,
          strokeStyle: 'red',
          lineDash: [4, 3],
          useAsPath: true,
          delta: {
              roll: 0.1,
          },
          shadowColor: 'black',
          shadowOffsetX: 4,
          shadowOffsetY: 4,
          shadowBlur: 4,
      });

      const pins = scrawl.makeGroup({
          name: 'pins',
          host: canvas.base.name,
      });

      const angle = 3 / 7;

      scrawl.makeBlock({
          name: 'pin-1',
          group: 'pins',
          dimensions: [7, 7],
          handle: ['center', 'center'],
          path: 'base-oval',
          pathPosition: (angle * 1) % 1,
          lockTo: 'path',
          fillStyle: 'blue',
          shadowColor: 'black',
          shadowOffsetX: 4,
          shadowOffsetY: 4,
          shadowBlur: 4,
      }).clone({
          name: 'pin-2',
          pathPosition: (angle * 2) % 1,
      }).clone({
          name: 'pin-3',
          pathPosition: (angle * 3) % 1,
      }).clone({
          name: 'pin-4',
          pathPosition: (angle * 4) % 1,
      }).clone({
          name: 'pin-5',
          pathPosition: (angle * 5) % 1,
      }).clone({
          name: 'pin-6',
          pathPosition: (angle * 6) % 1,
      }).clone({
          name: 'pin-7',
          pathPosition: (angle * 7) % 1,
      });

      scrawl.makePolyline({
          name: 'polly',
          pins: pins.get('artefacts'),
          tension: 0,
          closed: true,
          mapToPins: true,

          strokeStyle: 'orange',
          lineWidth: 2,
          lineCap: 'round',
          lineJoin: 'round',

          shadowColor: 'black',
          shadowOffsetX: 4,
          shadowOffsetY: 4,
          shadowBlur: 4,
          method: 'draw',

          delta: {
              tension: 0.005,
          },
          deltaConstraints: {
              tension: [-3.5, 3, 'reverse'],
          },
          checkDeltaConstraints: true,
      });

- §

  #### Scene animation

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

      const report = reportSpeed('#reportmessage');

- §

  Create the Display cycle animation

      scrawl.makeRender({

          name: 'demo-animation',
          target: canvas,
          afterShow: report,
      });

- §

  #### User interaction

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

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

          switch (e.target.value) {

              case 'reverse' :
                  myWheel.set({
                      deltaConstraints: {
                          startX: [50, 550, 'reverse'],
                          startY: ['10%', '90%', 'reverse'],
                          scale: [0.5, 2, 'reverse'],
                          globalAlpha: [0.2, 1, 'reverse'],
                      },
                  });
                  break;

              case 'loop' :
                  myWheel.set({
                      deltaConstraints: {
                          startX: [50, 550, 'loop'],
                          startY: ['10%', '90%', 'loop'],
                          scale: [0.5, 2, 'loop'],
                          globalAlpha: [0.2, 1, 'loop'],
                      },
                  });
                  break;
          }
      }, '#constraintAction');

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

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

          const target = e.target;

          if (target) {

              if (parseInt(target.value, 10)) {

                  target.value = '0';
                  target.innerHTML = 'Add scaling';

                  myWheel.setDeltaValues({
                      scale: 'remove',
                  });
              }
              else {

                  target.value = '1';
                  target.innerHTML = 'Remove scaling';

                  myWheel.setDeltaValues({
                      scale: 'newNumber:0.01',
                  });
              }
          }

      }, '#scaling');

- §

  @ts-expect-error

      document.querySelector('#scaling').value = '0';
      document.querySelector('#scaling').innerHTML = 'Add scaling';

- §

  @ts-expect-error

      document.querySelector('#constraintAction').value = 'reverse';

- §

  #### Development and testing

      console.log(scrawl.library);