init commit

1 files changed, 90 insertions, 0 deletions

diff --git a/game-of-life.js b/game-of-life.js
new file mode 100644
index 0000000..7cec741
--- /dev/null
+++ b/game-of-life.js
@@ -0,0 +1,90 @@
+const pr = t => process.stdout.write(t)
+
+class GameOfLife {
+  constructor(){
+    this.width = process.stdout.columns - 2
+    this.height = process.stdout.rows - 4
+    this.cells = Array.from({length: this.width * this.height}, () => Math.round(Math.random()))
+  }
+
+  printBoard() {
+    console.clear()
+    pr('╔' + '═'.repeat(this.width) + '╗')
+    pr('║' + ' '.repeat(Math.floor((this.width - 12) / 2)) + 'GAME OF LIFE' + ' '.repeat(Math.ceil((this.width - 12) / 2)) + '║')
+    pr('╠' + '═'.repeat(this.width) + '╣')
+    for (let l=0; l<this.height; l++) {
+      pr('║' + this.cells.slice(l*this.width, (l+1)*this.width).map((c, i) => (
+        c === 1
+          ? this.prevCells && this.prevCells[l*this.width+i] === 1
+            ? '#'
+            : '\x1b[32m#\x1b[0m'
+          : this.prevCells && this.prevCells[l*this.width+i] === 1
+            ? '\x1b[31m#\x1b[0m'
+            : ' '
+      )).join('') + '║')
+    }
+    pr('╚' + '═'.repeat(this.width) + '╝')
+  }
+
+  findCell(x, y) {
+    return this.cells[x + y * this.width]
+  }
+
+  computeCellNextState(x, y){
+    const st = (x, y) => {
+      if (x >= 0 && x < this.width && y >= 0 && y < this.height) {
+        return this.findCell(x, y)
+      } else {
+        return 0;
+      }
+    }
+
+    const total = st(x-1, y-1) + st(x, y-1) + st(x+1, y-1) + st(x-1, y) + st(x+1, y) + st(x-1, y+1) + st(x, y+1) + st(x+1, y+1)
+
+    if (st(x, y) === 1) {
+      if (total < 2) {
+        return 0
+      } else if (total >= 2 && total <= 3) {
+        return 1
+      } else {
+        return 0
+      }
+    } else if (total === 3) {
+      return 1
+    } else {
+      return 0
+    }
+  }
+
+  printNextGeneration(){
+    const nextState = []
+
+    for (let y = 0; y < this.height; y++) {
+      for (let x = 0; x < this.width; x++) {
+        nextState.push(this.computeCellNextState(x, y))
+      }
+    }
+
+    this.prevCells = this.cells
+    this.cells = nextState
+    this.printBoard()
+  }
+}
+
+let game = new GameOfLife()
+
+pr('\u001B[?25l')
+let animation = setInterval(() => game.printNextGeneration(), 250)
+
+process.on('SIGINT', function() {
+  clearInterval(animation)
+  pr('\u001B[?25h')
+  console.clear()
+  process.exit()
+});
+
+process.stdout.on('resize', () => {
+  clearInterval(animation)
+  game = new GameOfLife()
+  animation = setInterval(() => game.printNextGeneration(), 250)
+})