README.md

@@ -44,3 +44,4 @@ See [Configuration Reference](https://vitejs.dev/guide/).
 - https://en.wikipedia.org/wiki/Hashlife
 - https://plato.stanford.edu/entries/cellular-automata/supplement.html
 - https://www.conwaylife.com/wiki/Cellular_automaton
+- https://conwaylife.com/

src/components/CanvasBoard.vue

@@ -25,6 +25,7 @@
     lonelinessRules,
     threebornRules,
     highLifeRules,
+    servietteRules,
     evolve2d,
   } from "../modules/automata.js";
   import { getRandomInt, sleep } from "../modules/common.js";
@@ -44,11 +45,13 @@
           loneliness: lonelinessRules,
           threeborn: threebornRules,
           highlife: highLifeRules,
+          serviette: servietteRules,
         },
       };
     },
     computed: {
       ...mapState(globalStore, {
+        loop: "loop",
         cellProperties: "cellProperties",
         ruleset: "ruleset1d",
         refreshRate: "refreshRate",
@@ -61,7 +64,6 @@
         getDraw2dPicture: "draw2dpicture",
         boardWidth: "boardWidth",
         boardHeight: "boardHeight",
-        picture: "picture",
         selected2dRules: "selected2dRules",
       }),
       ...mapWritableState(globalStore, {
@@ -69,11 +71,15 @@
         canvasWidth: "canvasWidth",
         canvasHeight: "canvasHeight",
         getReset: "reset",
+        picture: "picture",
       }),
       // used to determine the dimensions of the board
       max() {
         return Math.max(this.boardWidth, this.boardHeight);
       },
+      selectedRules() {
+        return this.available2dRules[this.selected2dRules.id];
+      },
     },
     watch: {
       getDraw1d(value) {
@@ -111,21 +117,32 @@
         "setBoardHeight",
       ]),
       // draws the board on the canvas
-      drawCanvas(board) {
-        const props = this.cellProperties;
-        board.map((row, y) => {
-          const d = props.size;
-          return row.map((cell, x) => {
-            this.ctx.fillStyle = (() => {
-              if (cell === 1) return props.liveColor;
-              return props.deadColor;
-            })();
-            if (this.drawingDirection === "x")
-              this.ctx.fillRect(y * d, x * d, d, d);
-            else this.ctx.fillRect(x * d, y * d, d, d);
-            return cell;
-          });
-        });
+      drawCanvas(board, width, height) {
+        const d = this.cellProperties.size;
+        // bool to RGBA colors
+        const img = board.flat().reduce((acc, cell, index) => {
+          const color = cell === 1 ? 0 : 255;
+          const i = index * 4;
+          acc.data[i] = color;
+          acc.data[i + 1] = color;
+          acc.data[i + 2] = color;
+          acc.data[i + 3] = 255;
+          return acc;
+        }, new ImageData(width, height));
+        // rescale and draw
+        this.ctx.save();
+        this.ctx.clearRect(0, 0, this.canvasWidth, this.canvasHeight);
+        this.workCtx.putImageData(img, 0, 0);
+        this.ctx.imageSmoothingEnabled = false;
+        if (this.getDraw2dPicture != true) this.ctx.scale(d, d);
+        this.ctx.drawImage(
+          this.workCanvas,
+          0,
+          0,
+          this.canvasWidth,
+          this.canvasHeight
+        );
+        this.ctx.restore();
       },
       // create a first state, either a single living cell
       // at the center or random ones
@@ -134,101 +151,88 @@
           return create1dStateOneCell(this.boardWidth);
         return create1dState(this.boardWidth, getRandomInt, [0, 2]);
       },
-      // draw elementary automaton on the canvas based on selected ruleset
-      draw1d() {
-        const initialState = this.compute1dInitialState();
-        const board = createBoard(initialState, this.ruleset.rules, this.max);
-        this.lastBoard = Object.freeze(board);
-        this.drawCanvas(this.lastBoard);
-        this.toggleStop();
-      },
-      // draw 2D automaton on the canvas in a loop
-      draw2d(board) {
-        if (!this.canDraw) return;
-        const draw2dNext = async (b) => {
-          if (!this.canDraw) return;
-          const newBoard = evolve2d(
-            b,
-            this.available2dRules[this.selected2dRules.id]
-          );
-          this.drawCanvas(b, this.cellProperties);
-          this.lastBoard = Object.freeze(newBoard);
-          await sleep(this.refreshRate);
-          draw2dNext(newBoard);
-        };
-        return draw2dNext(board);
-      },
-      // draw 2d automaton from a new state
-      draw2dNew() {
-        const initialState = create2dState(
+      // initialize board with random cells
+      randomInitialState() {
+        return create2dState(
           this.boardWidth,
           this.boardHeight,
           getRandomInt,
           [0, 2]
         );
-        const board = evolve2d(initialState, conwayRules);
+      },
+      // draw elementary automaton on the canvas based on selected ruleset
+      draw1d() {
+        const initialState = this.compute1dInitialState();
+        const board = createBoard(initialState, this.ruleset.rules, this.max);
         this.lastBoard = Object.freeze(board);
-        this.draw2d(board);
+        this.drawCanvas(this.lastBoard, this.boardWidth, this.boardHeight);
+        this.toggleStop();
+      },
+      // draw 2D automaton on the canvas in a loop
+      draw2d(board) {
+        const newBoard = evolve2d(board, this.selectedRules);
+        this.drawCanvas(newBoard, this.boardWidth, this.boardHeight);
+        this.lastBoard = Object.freeze(newBoard);
+      },
+      // draw 2d automaton in a loop, starting from passed state
+      async draw2dNext(board) {
+        requestAnimationFrame(() => {
+          if (!this.canDraw) return;
+          const newBoard = evolve2d(board, this.selectedRules);
+          this.draw2d(board);
+          this.lastBoard = Object.freeze(newBoard);
+          /* await sleep(this.refreshRate) */
+          return this.draw2dNext(newBoard);
+        });
+      },
+      // draw 2d automaton from a new state
+      async draw2dNew() {
+        if (!this.canDraw) return;
+        const initialState = this.randomInitialState();
+        let board = evolve2d(initialState, conwayRules);
+        if (this.loop) return this.draw2dNext(board);
+        else this.draw2d(board);
+        this.toggleStop();
       },
       // draw 2d automaton from the last known generated board
-      draw2dLast() {
-        if (this.lastBoard != undefined) this.draw2d(this.lastBoard);
+      async draw2dLast() {
+        if (!this.canDraw) return;
+        if (this.loop) return this.draw2dNext(this.lastBoard);
+        else this.draw2d(this.lastBoard);
+        this.toggleStop();
       },
       // draw 2d automaton from an uploaded picture.
       // use the picture representation as an initial state
       draw2dPicture() {
         // get image data by drawing it on a work canvas
-        this.workCtx.drawImage(
+        this.ctx.fillStyle = "black";
+        this.ctx.fillRect(0, 0, this.canvasWidth, this.canvasHeight);
+        this.ctx.drawImage(
           this.picture,
-          0,
-          0,
-          this.canvasWidth,
-          this.canvasHeight
+          Math.floor((this.canvasWidth - this.picture.width) / 2),
+          Math.floor((this.canvasHeight - this.picture.height) / 2),
+          this.picture.width,
+          this.picture.height
         );
-        const imgData = this.workCtx.getImageData(
+
+        const imgData = this.ctx.getImageData(
           0,
           0,
           this.canvasWidth,
           this.canvasHeight
         );
 
-        // convert the image to black and white
-        const black = picToBlackAndWhite(
-          imgData.data,
-          this.canvasWidth,
-          this.canvasHeight
-        );
-
-        // draw it back on the canvas
-        this.ctx.putImageData(black, 0, 0);
-
-        // draw the image back on the work canvas with the dimensions of the board
-        this.workCtx.drawImage(
-          this.picture,
-          0,
-          0,
-          this.boardWidth,
-          this.boardHeight
-        );
-
-        const resized = this.workCtx.getImageData(
-          0,
-          0,
-          this.boardWidth,
-          this.boardHeight
-        );
-
-        // convert the resized image into a 2D board of boolean based on pixel value
+        // convert the image into a 2D board of boolean based on pixel value
         this.lastBoard = Object.freeze(
-          picToBoard(resized.data, this.boardWidth, this.boardHeight)
+          picToBoard(imgData.data, this.canvasWidth, this.canvasHeight)
         );
-
         this.toggleStop();
       },
       // stop drawing routines and clear the canvas
       reset() {
         this.toggleStop();
-        this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
+        this.lastBoard = {};
+        this.ctx.clearRect(0, 0, this.canvasWidth, this.canvasHeight);
         this.getReset = 0;
       },
     },

src/components/Menu2dCA.vue

@@ -67,7 +67,6 @@
       preparePicture(event) {
         const files = event.target.files;
         this.picture = new Image();
-        this.picture.width = this.canvasWidth;
         if (FileReader && files && files.length) {
           const reader = new FileReader();
 

src/modules/automata.js

@@ -91,6 +91,15 @@ function conwayRules(cell, neighbors) {
   return cell;
 }
 
+// Get the next evolution of a cell according to
+// Conway's game of life rules
+function servietteRules(cell, neighbors) {
+  // loneliness rule
+  if (cell === 0 && [2, 3, 4].find((x) => x == neighbors)) return 1;
+  // the cell remains the same if none apply
+  return 0;
+}
+
 // variation of the game of life where a
 // cell comes to live if 6 neigbor cells are alive
 function highLifeRules(cell, neighbors) {
@@ -200,6 +209,7 @@ export {
   lonelinessRules,
   threebornRules,
   highLifeRules,
+  servietteRules,
   evolve1d,
   evolve2d,
 };

src/modules/picture.js

@@ -31,7 +31,7 @@ export function picToBoard(pixels, width, height) {
     if (index % 4 == 0) {
       const count = pixels[index] + pixels[index + 1] + pixels[index + 2];
       const value = count >= 255 ? 1 : 0;
-      acc.push(value);
+      acc[index] = value;
     }
     return acc;
   }, []);

src/modules/preset.js

@@ -77,6 +77,19 @@ const presetRuleset = [
       "000": 1,
     },
   },
+  {
+    name: "unknown rule 2",
+    rules: {
+      100: 1,
+      101: 0,
+      110: 1,
+      111: 0,
+      "011": 0,
+      "010": 0,
+      "001": 0,
+      "000": 1,
+    },
+  },
 ];
 
 const initialStates = [
@@ -122,6 +135,11 @@ const preset2dRules = [
     description:
       "Variation on Conway's Game of Life where a cell live if the six neighbor cells are alive",
   },
+  {
+    id: "serviette",
+    name: "Serviette variation",
+    description: "bla",
+  },
 ];
 
 export { presetRuleset, initialStates, preset2dRules };

src/stores/index.js

@@ -33,7 +33,7 @@ export const globalStore = defineStore("globalStore", {
       refreshRate: 300,
       initial1dState: "onecell",
       drawingDirection: "y",
-      lastBoard: {},
+      lastBoard: null,
       draw1d: false,
       draw2d: false,
       draw2dLast: false,
@@ -43,6 +43,7 @@ export const globalStore = defineStore("globalStore", {
       picture: null,
       mainMenu: false,
       activeSubMenu: "",
+      loop: true,
     };
   },
   actions: {