use HAXE_PATH in makefile

Makefile

@@ -18,7 +18,7 @@ debug: HAXE_FLAGS += -D webconsole --debug
 debug: build
 
 $(HAXE_PATH): $(shell find src -name '*.hx')
-	haxe build.hxml $(HAXE_FLAGS)
+	haxe build.hxml $(HAXE_FLAGS) --cmd "cp build/haxe.lua $(HAXE_PATH)"
 
 $(MIN_PATH): $(POLYFILL_PATH)
 	node minify.js $(POLYFILL_PATH) $@

src/util/Pos.hx

@@ -0,0 +1,26 @@
+package util;
+
+import util.Vec.Vec2;
+
+@:forward(x,y)
+abstract Pos(Vec2<Int>) from Vec2<Int> to Vec2<Int>{
+	inline public function new(i:Vec2<Int>) {
+		this = i;
+	}
+
+	@:op(A + B)
+	public function add(rhs: Vec2<Int>):Pos {
+		return new Pos({
+			y: this.y + rhs.y,
+			x: this.x + rhs.x,
+		});
+	}
+
+	@:op(A - B)
+	public function sub(rhs: Vec2<Int>):Pos {
+		return new Pos({
+			y: this.y - rhs.y,
+			x: this.x - rhs.x,
+		});
+	}
+}