high life rule

src/components/CanvasBoard.vue

@@ -24,6 +24,7 @@
     overpopulationRules,
     lonelinessRules,
     threebornRules,
+    highLifeRules,
     evolve2d,
   } from "../modules/automata.js";
   import { getRandomInt, sleep } from "../modules/common.js";
@@ -42,6 +43,7 @@
           overpopulation: overpopulationRules,
           loneliness: lonelinessRules,
           threeborn: threebornRules,
+          highlife: highLifeRules,
         },
       };
     },

src/modules/automata.js

@@ -91,6 +91,21 @@ function conwayRules(cell, neighbors) {
   return cell;
 }
 
+// variation of the game of life where a
+// cell comes to live if 6 neigbor cells are alive
+function highLifeRules(cell, neighbors) {
+  // loneliness rule
+  if (cell === 1 && neighbors < 2) return 0;
+  // overpopulation rule
+  if (cell === 1 && neighbors > 3) return 0;
+  // born when three live neighbors rule
+  if (cell === 0 && neighbors === 2) return 1;
+  // highlife rules
+  if ((cell === 0 && neighbors === 3) || neighbors === 6) return 1;
+  // the cell remains the same if none apply
+  return cell;
+}
+
 // variation on the game of life's rules,
 // where the "three live neighbors" rule is ignored
 function threebornRules(cell, neighbors) {
@@ -184,6 +199,7 @@ export {
   overpopulationRules,
   lonelinessRules,
   threebornRules,
+  highLifeRules,
   evolve1d,
   evolve2d,
 };

src/modules/preset.js

@@ -116,6 +116,12 @@ const preset2dRules = [
     description:
       "Variation on Conway's Game of Life *without* the 'three live neighbors' rule",
   },
+  {
+    id: "highlife",
+    name: "HighLife variation",
+    description:
+      "Variation on Conway's Game of Life where a cell live if the six neighbor cells are alive",
+  },
 ];
 
 export { presetRuleset, initialStates, preset2dRules };