From 2e0da4f44a831cb7944766cc9041d2e350eb433a Mon Sep 17 00:00:00 2001
From: Jacek Olszak <jacekolszak@gmail.com>
Date: Tue, 12 Feb 2019 21:06:37 +0100
Subject: [PATCH] #159 Another reduction of Simplify Matrix.Unproject formulas

---
 geometry.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/geometry.go b/geometry.go
index 03b2fea..4680872 100644
--- a/geometry.go
+++ b/geometry.go
@@ -405,7 +405,7 @@ func (m Matrix) Project(u Vec) Vec {
 func (m Matrix) Unproject(u Vec) Vec {
 	det := m[0]*m[3] - m[2]*m[1]
 	return Vec{
-		(m[3]*u.X - m[2]*u.Y + m[2]*m[5] - m[3]*m[4]) / det,
-		(-m[1]*u.X + m[0]*u.Y + m[1]*m[4] - m[0]*m[5]) / det,
+		(m[3]*(u.X-m[4]) - m[2]*(u.Y-m[5])) / det,
+		(-m[1]*(u.X-m[4]) + m[0]*(u.Y-m[5])) / det,
 	}
 }