From a7fdbd618e3eafc8df39dbd6d6cf279d8b810db8 Mon Sep 17 00:00:00 2001
From: faiface <faiface@ksp.sk>
Date: Wed, 1 Mar 2017 23:12:48 +0100
Subject: [PATCH] add Vec.Apply
---
geometry.go | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/geometry.go b/geometry.go
index b426686..d89217f 100644
--- a/geometry.go
+++ b/geometry.go
@@ -97,6 +97,15 @@ func (u Vec) Cross(v Vec) float64 {
return u.X()*v.Y() - v.X()*u.Y()
}
+// Apply applies the function f to both x and y components of the vector u and returns the modified
+// vector.
+func (u Vec) Apply(f func(float64) float64) Vec {
+ return V(
+ f(u.X()),
+ f(u.Y()),
+ )
+}
+
// Rect is a 2D rectangle aligned with the axes of the coordinate system. It has a position
// and a size.
//
--
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