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- §

  # Demo Particles 016

  Mesh entitys

- §

  Run code

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

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

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  #### Scene setup

      const canvas = scrawl.library.artefact.mycanvas;

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  Import image from DOM

      scrawl.importDomImage('.flowers');

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  Every Mesh uses a Net entity

      scrawl.makeNet({

          name: 'test-net',
          order: 1,

          world: scrawl.makeWorld({
              name: 'demo-world',
          }),

          start: [50, 50],

          generate: 'weak-net',

          postGenerate: function () {

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  @ts-expect-error

              this.springs.forEach(s => {

                  s.particleFromIsStatic = true;
                  s.particleToIsStatic = true;
              });
          },

          rows: 4,
          columns: 6,
          rowDistance: 100,
          columnDistance: 100,

          showSprings: true,
          showSpringsColor: 'rgb(255 255 255 / 0.3)',

          forces: [],

          engine: 'euler',

          artefact: scrawl.makeWheel({

              name: 'particle-wheel',
              radius: 7,

              handle: ['center', 'center'],

              method: 'fillThenDraw',
              fillStyle: 'rgb(200 0 0 / 0.7)',
              strokeStyle: 'white',
              lineWidth: 2,

              visibility: false,

              noUserInteraction: true,
              noPositionDependencies: true,
              noFilters: true,
              noDeltaUpdates: true,
          }),

          stampAction: function (artefact, particle, host) {

              const [ , , ...start] = particle.history[0];

              artefact.simpleStamp(host, {
                  start,
                  fillStyle: particle.fill,
                  strokeStyle: particle.stroke,
              });
          },

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  Make all of the Net entity’s Particles draggable

          particlesAreDraggable: true,
      });

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  Every Mesh also needs a source image

      const myPicture = scrawl.makePicture({

          name: 'my-flower',
          asset: 'iris',

          copyStartX: 0,
          copyStartY: 0,

          copyWidth: '100%',
          copyHeight: '100%',

          visibility: false,
      });

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  The Mesh entity definition

      scrawl.makeMesh({

          name: 'display-mesh',

          net: 'test-net',
          source: 'my-flower',

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

          method: 'fillThenDraw',

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  @ts-expect-error

          onEnter: function () { this.set({ lineWidth: 6 }) },

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  @ts-expect-error

          onLeave: function () { this.set({ lineWidth: 2 }) },
      });

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  #### Scene animation

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

      const report = reportSpeed('#reportmessage');

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  Create the Display cycle animation

      scrawl.makeRender({

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

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  #### User interaction

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  Mouse movement over and away from the Loom (emulates CSS element `hover` functionality)

      const interactions = function () { canvas.cascadeEventAction('move') };
      scrawl.addListener('move', interactions, canvas.domElement);

- §

  Create drag functionality

  - KNOWN BUG - the particles are not draggable on first user mousedown, but are draggable afterwards

      scrawl.makeGroup({

          name: 'my-draggable-group',

      }).addArtefacts('test-net');

      scrawl.makeDragZone({

          zone: canvas,
          collisionGroup: 'my-draggable-group',
          endOn: ['up', 'leave'],
          preventTouchDefaultWhenDragging: true,
      });

- §

  #### Drag-and-Drop image loading functionality

      addImageDragAndDrop(canvas, '#my-image-store', [myPicture]);

- §

  #### Development and testing

      console.log(scrawl.library);