func BasicOperationsSpec(c gospec.Context) { a := linear.Vec2{3, 4} b := linear.Vec2{5, 6} c.Specify("Make sure adding vectors works.", func() { VecExpect(c, a.Add(b), Equals, linear.Vec2{8, 10}) }) c.Specify("Make sure subtracting vectors works.", func() { VecExpect(c, a.Sub(b), Equals, linear.Vec2{-2, -2}) }) c.Specify("Make sure dotting vectors works.", func() { c.Expect(a.Dot(b), IsWithin(1e-9), 39.0) }) c.Specify("Make sure crossing vectors works.", func() { VecExpect(c, a.Cross(), Equals, linear.Vec2{-4, 3}) }) c.Specify("Make sure taking the magnitude of vectors works.", func() { c.Expect(a.Mag(), IsWithin(1e-9), 5.0) c.Expect(a.Mag2(), IsWithin(1e-9), 25.0) }) c.Specify("Make sure scaling vectors works.", func() { VecExpect(c, a.Scale(3), Equals, linear.Vec2{9, 12}) }) }
func BasicPropertiesSpec(c gospec.Context) { a := linear.Vec2{3, 4} b := linear.Vec2{5, 6} c.Specify("Check that (cross a) dot a == 0.", func() { c.Expect(a.Cross().Dot(a), Equals, 0.0) }) c.Specify("Check that a normalize vector's magnitude is 1.", func() { c.Expect(a.Norm().Mag(), IsWithin(1e-9), 1.0) }) c.Specify("Check that v.Mag2() == v.Mag()*v.Mag()", func() { c.Expect(a.Mag2(), IsWithin(1e-9), a.Mag()*a.Mag()) }) c.Specify("Check that a scaled vector's magnitude is appropriately scaled.", func() { c.Expect(a.Scale(3.5).Mag(), IsWithin(1e-9), a.Mag()*3.5) }) c.Specify("Check that a-(a-b) == b.", func() { VecExpect(c, a.Sub(a.Sub(b)), IsWithin(1e-9), b) }) }