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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 062

  Group and ungroup entitys; create a bespoke drag-drop UX

- §

  Run code

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

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

- §

  #### Scene setup

      const canvas = scrawl.library.canvas.mycanvas;

      const [w, h] = canvas.get('dimensions');

      const colorEngine = scrawl.makeColor({

          name: 'color-engine',
          minimumColor: 'red',
          maximumColor: 'blue',
      });

      const boxGroup = scrawl.makeGroup({
          name: 'box-group',
          host: canvas.base.name,
      });

      for (let i = 0; i < 100; i++) {

          scrawl.makeBlock({

              name: `b-${i}`,
              group: 'box-group',
              dimensions: [30, 30],
              startX: (w * 0.1) + (Math.random() * (w * 0.8)),
              startY: (h * 0.1) + (Math.random() * (h * 0.8)),
              handle: ['center', 'center'],
              roll: Math.random() * 360,
              fillStyle: colorEngine.getRangeColor(Math.random()),
              globalAlpha: 0.25,
              delta: {
                  roll: 0.8,
              },
              noDeltaUpdates: true,
          });
      }

      const referenceGroup = scrawl.makeGroup({
          name: 'reference-group',
          host: canvas.base.name,
      });

      const referenceBlock = scrawl.makeBlock({

          name: 'reference-block',
          group: 'reference-group',
          dimensions: [0, 0],
          method: 'draw',
          lineDash: [4, 2],
          delta: {
              lineDashOffset: 0.2,
          },

          onEnter: function () {

              canvas.set({
                  css: {
                      cursor: 'grab',
                  },
              });

- §

  @ts-expect-error

              this.set({
                  lineDash: [16, 2],
                  lineWidth: 2,
              });
          },

          onLeave: function () {

              canvas.set({
                  css: {
                      cursor: 'auto',
                  },
              });

- §

  @ts-expect-error

              this.set({
                  lineDash: [4, 2],
                  lineWidth: 1,
              });
          },
      });

      const gatherGroup = scrawl.makeGroup({
          name: 'gather-group',
      });

      let isGathering = false,
          isMoving = false;

      let startX = 0,
          startY = 0;

      const downAction = () => {

          const { here } = canvas;

          if (here) {

              const hit = referenceGroup.getArtefactAt(here);

              if (typeof hit !== 'boolean' && hit.artefact) {

                  isMoving = true;
                  isGathering = false;
              }
              else {

                  boxGroup.setArtefacts({
                      globalAlpha: 0.25,
                      noDeltaUpdates: true,
                  });

                  const {x, y} = here;

                  startX = x;
                  startY = y;

                  referenceBlock.set({
                      start: [x, y],
                      dimensions: [0, 0],
                  });

                  isGathering = true;
                  isMoving = false;
              }
          }
      }

      const moveAction = (e) => {

          if (isGathering) doGathering();
          else if (isMoving) doMoving(e);
      };

      const doGathering = () => {

          const { here } = canvas;

          if (here) {

              const {x, y} = here;

              let width = 0,
                  height = 0,
                  revStartX = 0,
                  revStartY = 0;

              if (x < startX) {

                  width = startX - x;
                  revStartX = x;
              }
              else width = x - startX;

              if (y < startY) {

                  height = startY - y;
                  revStartY = y;
              }
              else height = y - startY;

              referenceBlock.set({
                  startX: revStartX || startX,
                  startY: revStartY || startY,
                  width,
                  height,
              });

              gatherGroup.setArtefacts({
                  globalAlpha: 0.25,
                  noDeltaUpdates: true,
              });

              gatherGroup.clearArtefacts();

              const boxes = boxGroup.get('artefacts');

              boxes.forEach(b => {

                  const box = boxGroup.getArtefact(b);

                  if (box) {

                      const hit = referenceGroup.getArtefactAt([box.get('position')]);

                      if (typeof hit !== 'boolean' && hit.artefact) {

                          gatherGroup.addArtefacts(box);
                      }
                  }
              });

              gatherGroup.setArtefacts({
                  globalAlpha: 1,
                  noDeltaUpdates: false,
              });
          }
      };

      const doMoving = (e) => {

          if (e) {

              e.preventDefault();

              const { movementX, movementY } = e;

              gatherGroup.updateArtefacts({
                  startX: movementX,
                  startY: movementY,
              });

              referenceGroup.updateArtefacts({
                  startX: movementX,
                  startY: movementY,
              });
          }
      }

      const upAction = () => {

          isGathering = false;
          isMoving = false;
          startX = 0;
          startY = 0;
      };

      scrawl.addListener('down', downAction, canvas.domElement);
      scrawl.addListener('move', moveAction, canvas.domElement);
      scrawl.addListener(['up', 'leave'], upAction, canvas.domElement);

      scrawl.addListener('move', () => canvas.cascadeEventAction('move'), canvas.domElement);

- §

  #### 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,
      });

- §

  #### Development and testing

      console.log(scrawl.library);