Adds some helper utilities.

lib/utils/Vector2.dart

@@ -0,0 +1,151 @@
+class Vector2d {
+  static final Vector2d ZERO = Vector2d(X: 0, Z: 0);
+  double X = 0.0;
+  double Z = 0.0;
+
+  Vector2d({this.X = 0.0, this.Z = 0.0});
+
+  @override
+  bool operator ==(Object otherz) {
+    if (otherz is Vector2d) {
+      Vector2d other = otherz as Vector2d;
+      return X == other.X && Z == other.Z;
+    }
+    return false;
+  }
+
+  Vector2d operator +(Vector2d other) {
+    Vector2d n = Clone();
+    n.X += other.X;
+    n.Z += other.Z;
+
+    return n;
+  }
+
+  Vector2d operator -(Vector2d other) {
+    Vector2d n = Clone();
+    n.X -= other.X;
+    n.Z -= other.Z;
+
+    return n;
+  }
+
+  Vector2d operator *(Vector2d other) {
+    Vector2d n = Clone();
+    n.X *= other.X;
+    n.Z *= other.Z;
+
+    return n;
+  }
+
+  Vector2d operator /(Vector2d other) {
+    Vector2d n = Clone();
+    n.X /= other.X;
+    n.Z /= other.Z;
+
+    return n;
+  }
+
+  bool operator >(Vector2d other) {
+    return (X > other.X) || (X > other.Z);
+  }
+
+  bool operator <(Vector2d other) {
+    return (X < other.X) || (X < other.Z);
+  }
+
+  Vector2d Clone() {
+    return Vector2d(X: X, Z: Z);
+  }
+
+  @override
+  String toString() {
+    return "<${X}, ${Z}>";
+  }
+
+  bool inside(Vector2d min, Vector2d max) {
+    if (min.X <= X && max.X >= X) {
+      if (min.Z <= Z && max.Z >= Z) {
+        return true;
+      }
+    }
+
+    return false;
+  }
+}
+
+class Vector2i {
+  static final Vector2i ZERO = Vector2i(X: 0, Z: 0);
+  int X = 0;
+  int Z = 0;
+
+  Vector2i({this.X = 0, this.Z = 0});
+
+  @override
+  bool operator ==(Object otherz) {
+    if (otherz is Vector2i) {
+      Vector2i other = otherz as Vector2i;
+      return X == other.X && Z == other.Z;
+    }
+    return false;
+  }
+
+  Vector2i operator +(Vector2i other) {
+    Vector2i n = Clone();
+    n.X += other.X;
+    n.Z += other.Z;
+
+    return n;
+  }
+
+  Vector2i operator -(Vector2i other) {
+    Vector2i n = Clone();
+    n.X -= other.X;
+    n.Z -= other.Z;
+
+    return n;
+  }
+
+  Vector2i operator *(Vector2i other) {
+    Vector2i n = Clone();
+    n.X *= other.X;
+    n.Z *= other.Z;
+
+    return n;
+  }
+
+  Vector2i operator /(Vector2i other) {
+    Vector2i n = Clone();
+    n.X = (n.X / other.X).round();
+    n.Z = (n.Z / other.Z).round();
+
+    return n;
+  }
+
+  bool operator >(Vector2i other) {
+    return (X > other.X) || (X > other.Z);
+  }
+
+  bool operator <(Vector2i other) {
+    return (X < other.X) || (X < other.Z);
+  }
+
+  Vector2i Clone() {
+    return Vector2i(X: X, Z: Z);
+  }
+
+  @override
+  String toString() {
+    return "<${X}, ${Z}>";
+  }
+
+  bool inside(Vector2i min, Vector2i max) {
+    if (min.X <= X && max.X >= X) {
+      if (min.Z <= Z && max.Z >= Z) {
+        return true;
+      }
+    }
+
+    return false;
+  }
+}