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- §

  # Demo Canvas 008

  Picture entity position; manipulate copy attributes

- §

  Run code

      import {
          importDomImage,
          library as L,
          makePicture,
          makeRender,
          makeUpdater,
      } from '../source/scrawl.js'

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

- §

  #### Scene setup

  Get a handle to the Canvas wrapper

      const canvas = L.artefact.mycanvas;

- §

  Namespacing boilerplate

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

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  Import image from DOM, and create Picture entity using it

      importDomImage('.flowers');

      const piccy = makePicture({

          name: name('myFlower'),
          asset: 'iris',

          width: 200,
          height: 200,

          startX: 300,
          startY: 200,
          handleX: 100,
          handleY: 100,

          copyWidth: 200,
          copyHeight: 200,
          copyStartX: 100,
          copyStartY: 100,

          lineWidth: 10,
          strokeStyle: 'gold',

          order: 1,
          method: 'drawAndFill',

      });

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  Create a second Picture entity, this time pulling in the image dynamically

      piccy.clone({

          name: name('myFactory'),
          imageSource: 'img/canalFactory-800.webp',

          width: 600,
          height: 400,

          startX: 0,
          startY: 0,
          handleX: 0,
          handleY: 0,

          copyWidth: 600,
          copyHeight: 400,
          copyStartX: 150,
          copyStartY: 0,

          order: 0,
          method: 'fill',
      });

- §

  #### Scene animation

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

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

- §

  Getting values using this approach allows us to see the raw, unprocessed values held by the entity.

  - Use piccy.get(‘attributeName’) to obtain the processed values being used by the entity

          const [copyW, copyH] = piccy.copyDimensions;
          const [copyX, copyY] = piccy.copyStart;
          const [pasteX, pasteY] = piccy.start;
          const [pasteW, pasteH] = piccy.dimensions;
          const [handleX, handleY] = piccy.handle;

          const {roll, scale} = piccy;

          return `    Copy - x: ${copyX}, y: ${copyY}, w: ${copyW}, h: ${copyH}
          Paste - x: ${pasteX}, y: ${pasteY}, w: ${pasteW}, h:${pasteH}
          Handle - x: ${handleX}, y: ${handleY}
          Roll: ${roll}; Scale: ${scale}`;
      });

- §

  Create the Display cycle animation

      makeRender({

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

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  #### User interaction

  Setup form observer functionality

      makeUpdater({

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

          target: piccy,

          useNativeListener: true,
          preventDefault: true,

          updates: {

              copy_start_xPercent: ['copyStartX', '%'],
              copy_start_xAbsolute: ['copyStartX', 'round'],

              copy_start_yPercent: ['copyStartY', '%'],
              copy_start_yAbsolute: ['copyStartY', 'round'],

              copy_dims_widthPercent: ['copyWidth', '%'],
              copy_dims_widthAbsolute: ['copyWidth', 'round'],

              copy_dims_heightPercent: ['copyHeight', '%'],
              copy_dims_heightAbsolute: ['copyHeight', 'round'],

              paste_dims_widthPercent: ['width', '%'],
              paste_dims_widthAbsolute: ['width', 'round'],

              paste_dims_heightPercent: ['height', '%'],
              paste_dims_heightAbsolute: ['height', 'round'],

              paste_start_xPercent: ['startX', '%'],
              paste_start_xAbsolute: ['startX', 'round'],
              paste_start_xString: ['startX', 'raw'],

              paste_start_yPercent: ['startY', '%'],
              paste_start_yAbsolute: ['startY', 'round'],
              paste_start_yString: ['startY', 'raw'],

              paste_handle_xPercent: ['handleX', '%'],
              paste_handle_xAbsolute: ['handleX', 'round'],
              paste_handle_xString: ['handleX', 'raw'],

              paste_handle_yPercent: ['handleY', '%'],
              paste_handle_yAbsolute: ['handleY', 'round'],
              paste_handle_yString: ['handleY', 'raw'],

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

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

- §

  Setup form @ts-expect-error

      document.querySelector('#copy_start_xPercent').value = 25;

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  @ts-expect-error

      document.querySelector('#copy_start_yPercent').value = 25;

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  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

      document.querySelector('#paste_dims_widthPercent').value = 33;

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  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

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

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  @ts-expect-error

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

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  #### Development and testing

      console.log(L);