Update vector2.lua

res/modules/vector2.lua

@@ -163,6 +163,21 @@ function vector2:dist(vector)
     return result:len()
 end
 
+-- cross product for vec2 (in 3D space)
+-- @param {vec2} v - The other vec2
+-- @return {number} -> float || integer
+-- @usage
+--     local v1 = vec2(10, 15)
+--     local v2 = vec2(15, 10)
+--     print(v1:cross(v2)) -- Output: -125
+function vector2:cross(v)
+    if type(v) == "number" then
+        print("\n(( TypeError : cross ))\nType arg cross(vec2)")
+        error("Invalid input argument. Expected a vec2 object.\n")
+    end
+    return self.x * v.y - self.y * v.x
+end
+
 -- rotate vec2
 -- @param angle {number}
 -- @param axis {string} - axis rotate around (x, y, or z)
@@ -217,6 +232,28 @@ function vector2.__add(value_1, value_2)
 end
 
 
+-- sub vec 
+function vector2.__sub(value_1, value_2)
+    if type(value_1) == "number" then 
+        if value_1 == 0 then 
+            return vector2:new(value_2.x, value_2.y)
+        else 
+            return vector2:new(value_2.x - value_1, value_2.y - value_1)
+        end
+    else
+        if type(value_2) == "number" then
+            if value_2 == 0 then
+                return vector2:new(value_1.x, value_1.y)
+            else
+                return vector2:new(value_1.x - value_2, value_1.y - value_2)
+            end
+        else
+            return vector2:new(value_1.x - value_2.x, value_1.y - value_2.y)
+        end
+    end
+end
+
+
 
 -- mul vec
 function vector2.__mul(value_1, value_2)