Merge branch '53-encapsulate-ruleset-patterns-in-separate-data-structure' into 'master'

Resolve "Encapsulate Ruleset, Patterns in separate Data Structure"

Closes #53

See merge request marty.oehme/cellular-automata!14

lib/src/Cell.dart

@@ -1,6 +0,0 @@
-import 'package:rules_of_living/src/Rule.dart';
-
-class Cell {
-  /// For determining if render updates are necessary in [Grid].render() function
-  bool dirty = false;
-}

lib/src/Engine.dart

@@ -32,11 +32,11 @@ class Engine {
   /// Grid Size
   ///
   /// Number of cells on x coordinate and y coordinate. Can be set individually.
-  Point get gridSize => Point<int>(_grid.w, _grid.h);
+  Point get gridSize => Point<int>(_simulation.w, _simulation.h);
   void set gridSize(Point<int> value) {
     if (value.x <= 0 || value.y <= 0)
       throw ArgumentError("grid size must not be smaller than 1");
-    _grid = Simulation(value.x, value.y);
+    _simulation = Simulation(value.x, value.y);
   }
 
   num _updateLag = 0.0;
@@ -48,14 +48,14 @@ class Engine {
   /// be used if no canvas was defined at engine creation and it should be
   /// rendered later.
   html.CanvasElement canvas;
-  Simulation _grid;
+  Simulation _simulation;
   bool running = false;
 
   Engine([x = 100, y = 100, this.canvas]) {
-    _grid = Simulation(x, y);
+    _simulation = Simulation(x, y);
 
     _elapsed.start();
-    _grid.addPattern(amount: 15, dispersal: 5);
+    _simulation.addRandomPattern(amount: 15, dispersal: 5);
     html.window.animationFrame.then(animFrame);
   }
 
@@ -65,12 +65,12 @@ class Engine {
   }
 
   void reset() {
-    _grid.reset();
+    _simulation.reset();
     running = false;
   }
 
   void clear() {
-    _grid = new Simulation(gridSize.x, gridSize.y);
+    _simulation = new Simulation(gridSize.x, gridSize.y);
     running = false;
   }
 
@@ -101,8 +101,10 @@ class Engine {
   /// directly, since it is automatically taken care of by the processing function.
   /// If simulation should be advanced manually one time, prefer using step().
   void update() {
-    // TODO: create hasUpdated/hasAdvanced method in simulation to abstract actual updating away
-    if (_grid.update().length == 0) running = false;
+    Map<int, bool> simulationUpdate = _simulation.update();
+    _simulation.mergeStateChanges(simulationUpdate);
+
+    if (simulationUpdate.length == 0) running = false;
   }
 
   /// Advances Logic One Update
@@ -111,8 +113,8 @@ class Engine {
   /// simulation. Does not automatically re-render the new state
   /// (though this should usually not pose a problem).
   void step() {
+    update();
     running = false;
-    _grid.update();
   }
 
   /// Renders the Current Simulation State
@@ -121,26 +123,16 @@ class Engine {
   /// the internal engine processing. Does not do anything if no canvas is
   /// defined.
   void render([num interp]) {
-    if (canvas != null) _grid.render(canvas, interp);
+    if (canvas == null) return;
+
+    _simulation.render(canvas, interp);
   }
 
-  void addPattern(
-      {CellPattern pattern,
-      int x,
-      int y,
-      int amount,
-      int dispersal,
-      int seed}) {
-    _grid.addPattern(
-        pattern: pattern,
-        x: x,
-        y: y,
-        amount: amount,
-        dispersal: dispersal,
-        seed: seed);
+  void addPattern({int amount, int dispersal}) {
+    _simulation.addRandomPattern(amount: amount, dispersal: dispersal);
   }
 
   void toggleEdgeRendering() {
-    _grid.renderEdges = !_grid.renderEdges;
+    _simulation.renderEdges = !_simulation.renderEdges;
   }
 }

lib/src/Rule.dart

@@ -1,5 +0,0 @@
-class Rule {
-  final Function evaluate;
-
-  Rule(this.evaluate);
-}

lib/src/Simulation.dart

@@ -2,21 +2,20 @@ import 'dart:html' as html;
 import 'dart:math' as math;
 
 import 'package:rules_of_living/src/Grid.dart';
+import 'package:rules_of_living/src/rules/GameOfLife.dart';
+import 'package:rules_of_living/src/rules/RuleSet.dart';
 
 enum CellPattern { SpaceShip, Blinker }
 
 class Simulation {
   final Grid<bool> map;
+  RuleSet rules = GameOfLife();
 
   bool _dirty = true;
   bool _renderEdges = true;
 
-  int _startingSeed;
-  int _x;
-  int _y;
   int _amount;
   int _dispersal;
-  CellPattern _pattern;
 
   int get w => map.width;
   int get h => map.height;
@@ -28,71 +27,27 @@ class Simulation {
 
   void reset() {
     map.setAll(0, List.filled(map.length, false));
-    if (_startingSeed != null)
-      addPattern(
-          pattern: _pattern,
-          dispersal: _dispersal,
-          amount: _amount,
-          seed: _startingSeed,
-          x: _x,
-          y: _y);
     _dirty = true;
   }
 
-  void addPattern(
-      {CellPattern pattern,
-      int x,
-      int y,
-      int amount,
-      int dispersal,
-      int seed}) {
-    _startingSeed = seed ?? DateTime.now().millisecondsSinceEpoch;
+  void addRandomPattern({int amount, int dispersal}) {
+    int _startingSeed = DateTime.now().millisecondsSinceEpoch;
     math.Random rng = new math.Random(_startingSeed);
-    _x = x;
-    _y = y;
     _amount = amount ?? rng.nextInt(20);
     _dispersal = dispersal ?? 10;
-    _pattern = pattern;
-    int cx = x ?? rng.nextInt(map.width ~/ 3) + (map.width ~/ 3);
-    int cy = y ?? rng.nextInt(map.height ~/ 3) + (map.height ~/ 3);
-    switch (pattern) {
-      // Two blocks, offset
-      // ##
-      //   ##
-      case CellPattern.Blinker:
-        setCellState(cx, cy, true);
-        setCellState(cx + 1, cy, true);
-        setCellState(cx, cy + 1, true);
-        setCellState(cx + 1, cy + 1, true);
+    int cx = rng.nextInt(map.width ~/ 3) + (map.width ~/ 3);
+    int cy = rng.nextInt(map.height ~/ 3) + (map.height ~/ 3);
 
-        setCellState(cx + 2, cy + 2, true);
-        setCellState(cx + 3, cy + 2, true);
-        setCellState(cx + 2, cy + 3, true);
-        setCellState(cx + 3, cy + 3, true);
-        break;
-      // A 'gliding' Spaceship
-      //   #
-      //    #
-      //  ###
-      case CellPattern.SpaceShip:
-        setCellState(1 + cx, 0 + cy, true);
-        setCellState(2 + cx, 1 + cy, true);
-        setCellState(2 + cx, 2 + cy, true);
-        setCellState(1 + cx, 2 + cy, true);
-        setCellState(0 + cx, 2 + cy, true);
-        break;
-      default:
-        int sanityCheck = 0;
-        for (var i = 0; i < (_amount); i++) {
-          sanityCheck++;
-          getCellState(cx, cy)
-              ? i--
-              : setCellState(cx + rng.nextInt(_dispersal),
-                  cy + rng.nextInt(_dispersal), true);
-          if (sanityCheck > 100 && sanityCheck > i * 3) break;
-        }
-        break;
+    int sanityCheck = 0;
+    for (var i = 0; i < (_amount); i++) {
+      sanityCheck++;
+      getCellState(cx, cy)
+          ? i--
+          : setCellState(
+              cx + rng.nextInt(_dispersal), cy + rng.nextInt(_dispersal), true);
+      if (sanityCheck > 100 && sanityCheck > i * 3) break;
     }
+
     _dirty = true;
   }
 
@@ -118,29 +73,31 @@ class Simulation {
 
   Map<int, bool> update() {
     Map<int, bool> stateChanges = calculateNextState(map);
-
-    stateChanges.forEach((i, el) => map[i] = el);
-    stateChanges.length != 0 ? _dirty = true : false;
     return stateChanges;
   }
 
+  void mergeStateChanges(Map<int, bool> stateChanges) {
+    stateChanges.forEach((i, el) => map[i] = el);
+    if (stateChanges.length != 0) _dirty = true;
+  }
+
   Map<int, bool> calculateNextState(Grid<bool> oldState) {
     Map<int, bool> stateChanges = Map();
 
     for (int i = 0; i < map.length; i++) {
       math.Point p = map.toCoordinates(i);
       bool cell = map[i];
-      int neighbors = getSurroundingNeighbors(p.x, p.y, 1);
-      if (cell == false && neighbors == 3) {
+      int neighbors = getNeighbors(p.x, p.y, rules.range);
+      if (cell == false && rules.checkBirth(neighbors) == true) {
         stateChanges[i] = true;
-      } else if (cell == true && neighbors != 2 && neighbors != 3) {
+      } else if (cell == true && rules.checkSurvival(neighbors) == false) {
         stateChanges[i] = false;
       }
     }
     return stateChanges;
   }
 
-  int getSurroundingNeighbors(int x, int y, int range) {
+  int getNeighbors(int x, int y, int range) {
     int count = 0;
     for (int ix = -range + x; ix <= range + x; ix++) {
       for (int iy = -range + y; iy <= range + y; iy++) {

lib/src/rules/CellPattern.dart

@@ -0,0 +1,10 @@
+import 'package:collection/collection.dart';
+
+class CellPattern<Point> extends DelegatingList<Point> {
+  final String _name;
+  CellPattern(String name, List base)
+      : _name = name,
+        super(base);
+
+  String get name => _name;
+}

lib/src/rules/GameOfLife.dart

@@ -0,0 +1,38 @@
+import 'dart:math';
+
+import 'package:rules_of_living/src/rules/RuleSet.dart';
+import 'package:rules_of_living/src/rules/CellPattern.dart';
+
+class GameOfLife implements RuleSet {
+  int range = 1;
+  List<CellPattern> patterns = <CellPattern>[
+    // Two blocks, offset
+    // ##
+    //   ##
+    CellPattern("Blinker", [
+      Point(0, 0),
+      Point(1, 0),
+      Point(0, 1),
+      Point(1, 1),
+      Point(2, 2),
+      Point(3, 2),
+      Point(2, 3),
+      Point(3, 3)
+    ]),
+    // A 'gliding' Spaceship
+    //   #
+    //    #
+    //  ###
+    CellPattern("SpaceShip", [
+      Point(1, 0),
+      Point(2, 1),
+      Point(2, 2),
+      Point(1, 2),
+      Point(0, 2),
+    ])
+  ];
+
+  bool checkSurvival(int neighbors) =>
+      neighbors == 2 || neighbors == 3 ? true : false;
+  bool checkBirth(int neighbors) => neighbors == 3 ? true : false;
+}

lib/src/rules/RuleSet.dart

@@ -0,0 +1,9 @@
+import 'package:rules_of_living/src/rules/CellPattern.dart';
+
+abstract class RuleSet {
+  int range;
+  List<CellPattern> patterns;
+
+  bool checkSurvival(int neighbors);
+  bool checkBirth(int neighbors);
+}