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- §

  # Demo Canvas 053

  Display output from a Reaction-Diffusion asset

- §

  Run code

      import {
          addNativeListener,
          library as L,
          makeBlock,
          makePattern,
          makeReactionDiffusionAsset,
          makeRender,
          makeSpiral,
          makeWheel,
          makeUpdater,
      } from '../source/scrawl.js'

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

- §

  #### Scene setup

      const canvas = L.artefact.mycanvas;

- §

  Magic numbers

      const assetDimension = 80;

- §

  Make the canvas responsive canvas.set({ fit: ‘cover’, checkForResize: true, ignoreCanvasCssDimensions: true, }).setBase({ dimensions: [canvasDimension, canvasDimension], });

- §

  Build and display the reaction-diffusion asset

      const colorStops = {
        'stepped-grays': [
            [0, '#333'],
            [199, '#333'],
            [200, '#666'],
            [399, '#666'],
            [400, '#999'],
            [599, '#999'],
            [600, '#ccc'],
            [799, '#ccc'],
            [800, '#fff'],
            [999, '#fff'],
        ],
        'red-gradient': [
            [0, 'hsl(0 100% 40%)'],
            [999, 'hsl(0 100% 100%)'],
        ],
        'red-blue': [
            [0, 'rgb(255 0 0)'],
            [999, 'rgb(0 0 255)'],
        ],
        'hue-gradient': [
            [0, 'hwb(120 10% 10%)'],
            [999, 'hwb(240 10% 10%)'],
        ],
        'monochrome': [
            [0, 'black'],
            [999, 'white'],
        ],
      }

      const bespokeEasings = {

          'user-steps': (val) => {

              if (val < 0.2) return 0.1;
              if (val < 0.4) return 0.3;
              if (val < 0.6) return 0.5;
              if (val < 0.8) return 0.7;
              return 0.9;
          },
          'user-repeat': (val) => (val * 4) % 1,
      };

      const reactionAsset = makeReactionDiffusionAsset({

          name: 'reaction-diffusion-asset',
          width: assetDimension,
          height: assetDimension,

- §

  @ts-expect-error

          colors: colorStops['monochrome'],
      });

- §

  Test that the RD asset output is always tileable by displaying it via a Pattern style

      const myPattern = makePattern({

          name: 'rd-pattern',
          asset: reactionAsset,
      });

- §

  Display the RD asset output in a block

  - We could also display it in a Picture entity, or use it in a Filter object

      makeBlock({

          name: 'rd-block',
          dimensions: ['100%', '100%'],
          fillStyle: 'rd-pattern',
      });

- §

  Entitys that can be used by the RD asset for its initialization

  - Start positions and dimensions need to be in absolute coordinates/lengths because the RD asset will `simpleStamp` the entity onto a temporary canvas and populate the scene with the alpha channel values from the resulting ImageData object.

        ent.simpleStamp(cell, {
          fillStyle: 'white',
          strokeStyle: 'white',
        });

      makeBlock({
          name: 'initial-square',
          dimensions: [30, 30],
          visibility: false,
      });

      makeWheel({
          name: 'initial-circle',
          start: [4, 4],
          radius: 15,
          lineWidth: 6,
          method: 'draw',
          visibility: false,
      });

      makeSpiral({
          name: 'initial-spiral',
          loops: 5,
          loopIncrement: 8,
          drawFromLoop: 0,
          lineWidth: 3,
          method: 'draw',
          visibility: false,
      });

- §

  #### Scene animation

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

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

          const mx = myPattern.patternMatrix;

          const matrixVals = (mx) ?
              `[${mx.a}, ${mx.b}, ${mx.c}, ${mx.d}, ${mx.e}, ${mx.f}]` :
              '[]';

- §

  @ts-expect-error

          return `    Generation: ${reactionAsset.currentGeneration} of ${reactionAsset.maxGenerations}\n    Initial random seed level: ${reactionAsset.initialRandomSeedLevel}\n    Diffusion rates - A: ${reactionAsset.diffusionRateA}, B: ${reactionAsset.diffusionRateB}\n    Feed rate: ${reactionAsset.feedRate}; Kill rate: ${reactionAsset.killRate}\n    Asset dimensions - width: ${reactionAsset.width}, height: ${reactionAsset.height}\n    Pattern matrix: ${matrixVals}`;
      });

- §

  Create the Display cycle animation

      makeRender({

          name: 'demo-animation',
          target: canvas,

          commence: () => reactionAsset.update(),
          afterShow: report,
      });

- §

  #### User interaction

  Setup form observer functionality

      addNativeListener('input', (e) => {

          e.preventDefault();

          if (e && e.target) {

              const val = e.target.value;

              switch (val) {

                  case 'square':
                      reactionAsset.set({
                          initialSettingPreference: 'entity',
                          initialSettingEntity: 'initial-square',
                      });
                      break;

                  case 'circle':
                      reactionAsset.set({
                          initialSettingPreference: 'entity',
                          initialSettingEntity: 'initial-circle',
                      });
                      break;

                  case 'spiral':
                      reactionAsset.set({
                          initialSettingPreference: 'entity',
                          initialSettingEntity: 'initial-spiral',
                      });
                      break;

                  default:
                      reactionAsset.set({
                          initialSettingPreference: 'random',
                      });
              }
          }
      }, '#initialSettingPreference');

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

          e.preventDefault();

          if (e && e.target) {

              const val = e.target.value;

              reactionAsset.set({
                  colors: colorStops[val],
              })
          }
      }, '#colorStops');

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

          e.preventDefault();

          const val = e.target.value;

          if (['user-steps', 'user-repeat'].includes(val)) {
              reactionAsset.set({
                  easing: bespokeEasings[val],
              });
          }
          else {
              reactionAsset.set({
                  easing: val,
              });
          }

      }, '#easing');

      makeUpdater({

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

          target: myPattern,

          useNativeListener: true,
          preventDefault: true,

          updates: {
              matrixA: ['matrixA', 'float'],
              matrixB: ['matrixB', 'float'],
              matrixC: ['matrixC', 'float'],
              matrixD: ['matrixD', 'float'],
              matrixE: ['matrixE', 'round'],
              matrixF: ['matrixF', 'round'],
          },
      });

      makeUpdater({

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

          target: reactionAsset,

          useNativeListener: true,
          preventDefault: true,

          updates: {

              initialRandomSeedLevel: ['initialRandomSeedLevel', 'float'],
              diffusionRateA: ['diffusionRateA', 'float'],
              diffusionRateB: ['diffusionRateB', 'float'],
              feedRate: ['feedRate', 'float'],
              killRate: ['killRate', 'float'],
              drawEvery: ['drawEvery', 'round'],
              maxGenerations: ['maxGenerations', 'round'],
              canvasWidth: ['width', 'round'],
              canvasHeight: ['height', 'round'],
              randomEngineSeed: ['randomEngineSeed', 'raw'],

              paletteStart: ['paletteStart', 'round'],
              paletteEnd: ['paletteEnd', 'round'],
              precision: ['precision', 'round'],
              cyclePalette: ['cyclePalette', 'boolean'],
              colorSpace: ['colorSpace', 'raw'],
              returnColorAs: ['returnColorAs', 'raw'],
          },
      });

- §

  This listener updates the RD asset with the selected preset value. Most of the following code is to update the the Demo’s user interface

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

          e.preventDefault();

          if (e && e.target) {

              const val = e.target.value;

              reactionAsset.set({
                  preset: val,
              });

              switch (val) {

                  case 'negativeBubbles':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.098;

- §

  @ts-expect-error

                      qs_killRate.value = 0.0555;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 4000;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.05;
                      break;

                  case 'positiveBubbles':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.098;

- §

  @ts-expect-error

                      qs_killRate.value = 0.057;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 4000;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.1;
                      break;

                  case 'precriticalBubbles':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.082;

- §

  @ts-expect-error

                      qs_killRate.value = 0.059;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 4000;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.08;
                      break;

                  case 'wormsAndLoops':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.082;

- §

  @ts-expect-error

                      qs_killRate.value = 0.06;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 4000;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.08;
                      break;

                  case 'stableSolitons':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.074;

- §

  @ts-expect-error

                      qs_killRate.value = 0.064;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 4000;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.15;
                      break;

                  case 'uSkateWorld':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.062;

- §

  @ts-expect-error

                      qs_killRate.value = 0.0609;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 4000;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.0045;
                      break;

                  case 'worms':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.058;

- §

  @ts-expect-error

                      qs_killRate.value = 0.065;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 4000;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.1;
                      break;

                  case 'wormsJoinIntoMazes':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.046;

- §

  @ts-expect-error

                      qs_killRate.value = 0.063;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 4000;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.0045;
                      break;

                  case 'negatons':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.046;

- §

  @ts-expect-error

                      qs_killRate.value = 0.0594;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 4000;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.0045;
                      break;

                  case 'turingPatterns':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.042;

- §

  @ts-expect-error

                      qs_killRate.value = 0.059;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 4000;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.0045;
                      break;

                  case 'chaosToTuringNegatons':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.039;

- §

  @ts-expect-error

                      qs_killRate.value = 0.058;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 4000;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.0045;
                      break;

                  case 'fingerprints':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.037;

- §

  @ts-expect-error

                      qs_killRate.value = 0.06;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 4000;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.0045;
                      break;

                  case 'chaosWithNegatons':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.0353;

- §

  @ts-expect-error

                      qs_killRate.value = 0.0566;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 0;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.0045;
                      break;

                  case 'spotsAndWorms':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.034;

- §

  @ts-expect-error

                      qs_killRate.value = 0.0618;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 4000;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.0045;
                      break;

                  case 'selfReplicatingSpots':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.03;

- §

  @ts-expect-error

                      qs_killRate.value = 0.063;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 4000;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.0045;
                      break;

                  case 'superResonantMazes':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.03;

- §

  @ts-expect-error

                      qs_killRate.value = 0.0565;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 4000;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.0045;
                      break;

                  case 'mazes':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.029;

- §

  @ts-expect-error

                      qs_killRate.value = 0.057;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 4000;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.0045;
                      break;

                  case 'mazesWithSomeChaos':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.026;

- §

  @ts-expect-error

                      qs_killRate.value = 0.055;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 0;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.0045;
                      break;

                  case 'chaos':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.026;

- §

  @ts-expect-error

                      qs_killRate.value = 0.051;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 0;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.009;
                      break;

                  case 'warringMicrobes':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.022;

- §

  @ts-expect-error

                      qs_killRate.value = 0.059;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 0;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.0045;
                      break;

                  case 'spotsAndLoops':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.018;

- §

  @ts-expect-error

                      qs_killRate.value = 0.051;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 0;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.0045;
                      break;

                  case 'movingSpots':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.014;

- §

  @ts-expect-error

                      qs_killRate.value = 0.054;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 0;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.0045;
                      break;

                  case 'waves':

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.014;

- §

  @ts-expect-error

                      qs_killRate.value = 0.045;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 0;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.0045;
                      break;

                  default:

- §

  @ts-expect-error

                      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

                      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

                      qs_feedRate.value = 0.054;

- §

  @ts-expect-error

                      qs_killRate.value = 0.062;

- §

  @ts-expect-error

                      qs_maxGenerations.value = 4000;

- §

  @ts-expect-error

                      qs_initialRandomSeedLevel.value = 0.0045;
              }
          }
      }, '#presets');

- §

  Setup form

      const qs_presets = document.querySelector('#presets'),
          qs_initialRandomSeedLevel = document.querySelector('#initialRandomSeedLevel'),
          qs_diffusionRateA = document.querySelector('#diffusionRateA'),
          qs_diffusionRateB = document.querySelector('#diffusionRateB'),
          qs_feedRate = document.querySelector('#feedRate'),
          qs_killRate = document.querySelector('#killRate'),
          qs_drawEvery = document.querySelector('#drawEvery'),
          qs_maxGenerations = document.querySelector('#maxGenerations'),
          qs_canvasWidth = document.querySelector('#canvasWidth'),
          qs_canvasHeight = document.querySelector('#canvasHeight'),
          qs_matrixA = document.querySelector('#matrixA'),
          qs_matrixB = document.querySelector('#matrixB'),
          qs_matrixC = document.querySelector('#matrixC'),
          qs_matrixD = document.querySelector('#matrixD'),
          qs_matrixE = document.querySelector('#matrixE'),
          qs_matrixF = document.querySelector('#matrixF'),
          qs_initialSettingPreference = document.querySelector('#initialSettingPreference'),
          qs_randomEngineSeed = document.querySelector('#randomEngineSeed'),
          qs_paletteStart = document.querySelector('#paletteStart'),
          qs_paletteEnd = document.querySelector('#paletteEnd'),
          qs_precision = document.querySelector('#precision'),
          qs_easing = document.querySelector('#easing'),
          qs_colorStops = document.querySelector('#colorStops'),
          qs_cyclePalette = document.querySelector('#cyclePalette'),
          qs_colorSpace = document.querySelector('#colorSpace'),
          qs_returnColorAs = document.querySelector('#returnColorAs');

- §

  @ts-expect-error

      qs_presets.options.selectedIndex = 0;

- §

  @ts-expect-error

      qs_initialRandomSeedLevel.value = 0.1;

- §

  @ts-expect-error

      qs_diffusionRateA.value = 0.2097;

- §

  @ts-expect-error

      qs_diffusionRateB.value = 0.105;

- §

  @ts-expect-error

      qs_feedRate.value = 0.054;

- §

  @ts-expect-error

      qs_killRate.value = 0.062;

- §

  @ts-expect-error

      qs_drawEvery.value = 10;

- §

  @ts-expect-error

      qs_maxGenerations.value = 4000;

- §

  @ts-expect-error

      qs_canvasWidth.value = assetDimension;

- §

  @ts-expect-error

      qs_canvasHeight.value = assetDimension;

- §

  @ts-expect-error

      qs_matrixA.value = 1;

- §

  @ts-expect-error

      qs_matrixB.value = 0;

- §

  @ts-expect-error

      qs_matrixC.value = 0;

- §

  @ts-expect-error

      qs_matrixD.value = 1;

- §

  @ts-expect-error

      qs_matrixE.value = 0;

- §

  @ts-expect-error

      qs_matrixF.value = 0;

- §

  @ts-expect-error

      qs_initialSettingPreference.selectedIndex = 0;

- §

  @ts-expect-error

      qs_randomEngineSeed.value = reactionAsset.get('randomEngineSeed');

- §

  @ts-expect-error

      qs_paletteStart.value = 0;

- §

  @ts-expect-error

      qs_paletteEnd.value = 999;

- §

  @ts-expect-error

      qs_precision.value = 1;

- §

  @ts-expect-error

      qs_colorStops.options.selectedIndex = 0;

- §

  @ts-expect-error

      qs_easing.options.selectedIndex = 0;

- §

  @ts-expect-error

      qs_cyclePalette.options.selectedIndex = 0;

- §

  @ts-expect-error

      qs_colorSpace.options.selectedIndex = 0;

- §

  @ts-expect-error

      qs_returnColorAs.options.selectedIndex = 0;

- §

  #### Development and testing

      console.log(L);