add negate operator

prettyvec.nimble

@@ -1,7 +1,7 @@
 [Package]
 name = "prettyvec"
 author = "prettybauble"
-version = "1.0.0"
+version = "1.0.1"
 description = "Small library for working with vectors"
 license = "MIT"
 srcDir = "src"

src/prettyvec/vec2/vec2_math.nim

@@ -26,6 +26,10 @@ func `*`*(a, b: Vec2Obj): Vec2Obj =
   vec2(a.x * b.x, a.y * b.y)
 
 
+func `-`*(a: Vec2Obj): Vec2Obj =
+  ## Negates the vector
+  vec2(-a.x, -a.y)
+
 func `-`*(a: Vec2Obj, b: float): Vec2Obj =
   vec2(a.x - b, a.y - b)
 

src/prettyvec/vec3/vec3_math.nim

@@ -26,6 +26,10 @@ func `*`*(a, b: Vec3Obj): Vec3Obj =
   vec3(a.x * b.x, a.y * b.y, a.z * b.z)
 
 
+func `-`*(a: Vec3Obj): Vec3Obj =
+  ## Negates the vector
+  vec3(-a.x, -a.y, -a.z)
+
 func `-`*(a: Vec3Obj, b: float): Vec3Obj =
   vec3(a.x - b, a.y - b, a.z - b)
 

tests/test1.nim

@@ -17,6 +17,8 @@ suite "Vec2":
     assert vec2(1) - 5 == vec2(-4)
     assert vec2(1) / 5 == vec2(0.2)
 
+    assert -vec2(1, -2) == vec2(-1, 2)
+
   test "basic math":
     assert sqrt(vec2(4)) == vec2(2)
     assert pow(vec2(2), 3) == vec2(8, 8)
@@ -42,6 +44,8 @@ suite "Vec3":
     assert vec3(1) - 5 == vec3(-4)
     assert vec3(1) / 5 == vec3(0.2)
 
+    assert -vec3(1, -2, 3) == vec3(-1, 2, -3)
+
   test "basic math":
     assert sqrt(vec3(4)) == vec3(2)
     assert pow(vec3(4), 3) == vec3(64)