Initial Commit

lib/App.dart

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+import 'dart:html' as html;
+
+import 'package:rules_of_living/Cell.dart';
+import 'package:rules_of_living/Grid.dart';
+
+class App {
+  // Elapsed Time Counter - useful for Safety Timeout
+  Stopwatch _elapsed = new Stopwatch();
+
+  // Game Tick Rate - *does* impact game speed
+  final int _MS_PER_STEP = 1000 ~/ 1;
+
+  // Max Frame (i.e. Rendering) rate - does *not* impact game speed
+  final int _MS_PER_FRAME = 1000 ~/ 1;
+
+  // ms stuck in updateloop after which game will declare itself unresponsive
+  final int SAFETY_TIMEOUT = 1000;
+
+  num _updateLag = 0.0;
+  num _drawLag = 0.0;
+
+
+  final html.CanvasElement canvas;
+  final Grid grid = new Grid(20,20);
+  final List<List<Cell>> map = new Grid(20, 20).map;
+
+  App(this.canvas);
+
+  void process(num now) {
+    _drawLag = now;
+    _updateLag += _drawLag;
+    _elapsed.reset();
+
+    while (_updateLag >= _MS_PER_STEP) {
+      if (_elapsed.elapsedMilliseconds > SAFETY_TIMEOUT) {
+        // TODO stub - give warning etc when this occurs
+        break;
+      }
+      update();
+      _updateLag -= _MS_PER_STEP;
+    }
+
+    if (_drawLag >= _MS_PER_FRAME) {
+      render(_updateLag / _MS_PER_STEP);
+      _drawLag = 0;
+    }
+  }
+
+  void update() {
+    grid.update();
+  }
+
+
+  void render([num interp]) {
+    html.CanvasRenderingContext2D ctx = canvas.getContext('2d');
+    int brickW = (canvas.width ~/ map[0].length);
+    int brickH = (canvas.height ~/ map.length);
+    ctx.clearRect(0, 0, canvas.width, canvas.height);
+    for (int y = 0; y < map.length; y++) {
+      for (int x = 0; x < map[y].length; x++) {
+        Cell c = map[y][x];
+        if (c.state == true)
+          ctx.setFillColorRgb(155, 155, 255);
+        else
+          ctx.setFillColorRgb(0, 0, 0);
+        ctx.fillRect(x * brickW, y * brickH, brickW, brickH);
+      }
+    }
+  }
+}

lib/Cell.dart

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+import 'package:rules_of_living/Rule.dart';
+
+class Cell {
+  bool state;
+  List<Rule> surviveRules = new List<Rule>();
+  List<Rule> birthRules = new List<Rule>();
+
+  Cell([bool state = false]) : this.state = state;
+
+  void update(int neighbors) {
+    bool newState = false;
+    if (state == true) {
+      surviveRules.forEach((Rule rule) {
+        if (rule.evaluate(neighbors) == true) newState = true;
+      });
+    } else {
+      birthRules.forEach((Rule rule) {
+        if (rule.evaluate(neighbors) == true) newState = true;
+      });
+    }
+    state = newState;
+  }
+}

lib/Grid.dart

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+import 'package:rules_of_living/Cell.dart';
+import 'package:rules_of_living/Rule.dart';
+
+class Grid {
+  final int w;
+  final int h;
+  final List<List<Cell>> map;
+
+  Grid(int w, int h)
+      : this.w = w,
+        this.h = h,
+        this.map = new List() {
+    map.addAll(_buildGrid(w, h));
+
+    map[5][5].state = true;
+  }
+
+  List<List<Cell>> _buildGrid(int w, int h) {
+    List<List<Cell>> grid = new List(h);
+    Rule threeTrue = new Rule((int n) {
+      if(n==3) return true;
+      else return false;
+    });
+    Rule twoTrue = new Rule((int n) {
+      if(n==2) return true;
+      else return false;
+    });
+
+    for (int y = 0; y < h; y++) {
+      grid[y] = new List(w);
+      for (int x = 0; x < w; x++) {
+        // GIVES RULES FOR CONWAY GAME OF LIFE BY DEFAULT S23/B3
+        Cell cell = new Cell();
+        cell.surviveRules.add(twoTrue);
+        cell.surviveRules.add(threeTrue);
+        cell.birthRules.add(twoTrue);
+
+        grid[y][x] = new Cell();
+      }
+    }
+    return grid;
+  }
+
+  void update() {
+    for (int y = 0; y < h; y++) {
+      for (int x = 0; x < w; x++) {
+        // DEFAULTS TO CONWAY GAME OF LIFE RANGE OF ONE
+        map[y][x].update( getNeighbors(x, y, 1) );
+      }
+    }
+  }
+
+  int getNeighbors(int x, int y, int range) {
+    int count = 0;
+    for (int iy = y - range ~/ 2; iy < iy + range / 2; iy++) {
+      for (int ix = x - range ~/ 2; ix < ix + range / 2; ix++) {
+          if (iy > 0 && iy < map.length && ix > 0 && ix < map[iy].length &&
+            map[iy][ix].state == true) count++;
+      }
+    }
+    return count;
+  }
+}

lib/Rule.dart

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+class Rule {
+  final Function evaluate;
+
+  Rule(this.evaluate);
+}