Enable Sequential Coloring

lib/game/Game.dart

@@ -1,5 +1,4 @@
 import 'dart:html';
-
 import 'dart:math';
 
 typedef void gridIterator(int x, int y);
@@ -24,16 +23,18 @@ class Game {
   // In-World Logic Updates
   void update([num dt]) {
     Point next = isRandom ? nextPosRandom() : nextPosOrdered(_curPos);
-    grid[next.y][next.x] =
+    if (_curPos.x < 0) _curPos = Point(0, _curPos.y);
-        new Color(rng.nextInt(255), rng.nextInt(255), rng.nextInt(255));
+    Color newColor = isRandom ? randomColor() : nextColor(
+        grid[_curPos.y][_curPos.x]);
+    grid[next.y][next.x] = newColor;
     _curPos = next;
   }
 
   Point nextPosOrdered(Point curPos) {
     Point pos = Point(curPos.x, curPos.y);
-    if (pos.x >= grid[pos.y].length - 1) pos = Point(-1, pos.y + 1);
-    if (pos.y >= grid.length) pos = Point(-1, 0);
     pos = Point(pos.x + 1, pos.y);
+    if (pos.x >= grid[pos.y].length) pos = Point(0, pos.y + 1);
+    if (pos.y >= grid.length) pos = Point(0, 0);
     return pos;
   }
 
@@ -42,6 +43,20 @@ class Game {
     return Point(rng.nextInt(grid[ry].length), ry);
   }
 
+  Color randomColor([int max = 255]) {
+    return new Color(rng.nextInt(max), rng.nextInt(max), rng.nextInt(max));
+  }
+
+  Color nextColor(Color col) {
+    if (col.r > 254 || col.g > 254 || col.b > 254) return randomColor(100);
+    if (col.r > col.g && col.r > col.b)
+      return Color(col.r + 1, col.g, col.b);
+    else if (col.b > col.r && col.b > col.g)
+      return Color(col.r, col.g, col.b + 1);
+    else
+      return Color(col.r, col.g + 1, col.b);
+  }
+
   // Render Pipeline
   void draw([num interp]) {
     CanvasRenderingContext2D ctx = this.canvas.context2D;
@@ -119,4 +134,9 @@ class Color {
   final int b;
 
   const Color(this.r, this.g, this.b);
+
+  @override
+  String toString() {
+    return "Color: (r:$r, g:$g, b:$b)";
+  }
 }