From 1f1c5eb31ab31bd641f11914680aed9d041952d9 Mon Sep 17 00:00:00 2001
From: Jinwoo Song <jinwoo7.song@samsung.com>
Date: Wed, 3 Jun 2015 18:33:51 +0900
Subject: [PATCH] Apply skew transformation for alpha and beta angles.

This patch is to fix #6237 in servo.
---
 Cargo.toml    | 2 +-
 src/matrix.rs | 6 ++++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 59c4482..2d49de5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "euclid"
-version = "0.1.6"
+version = "0.2.0"
 authors = ["The Servo Project Developers"]
 description = "Geometry primitives"
 documentation = "http://doc.servo.org/euclid/"
diff --git a/src/matrix.rs b/src/matrix.rs
index 6db2361..ebef7d7 100644
--- a/src/matrix.rs
+++ b/src/matrix.rs
@@ -303,8 +303,10 @@ impl Matrix4 {
         )
     }
 
-    /// Create a 2d skew matrix
-    pub fn create_skew(sx: f32, sy: f32) -> Matrix4 {
+    /// Create a 2d skew matrix.
+    /// https://drafts.csswg.org/css-transforms/#funcdef-skew
+    pub fn create_skew(alpha: f32, beta: f32) -> Matrix4 {
+        let (sx, sy) = (beta.tan(), alpha.tan());
         Matrix4::new(1.0,  sx, 0.0, 0.0,
                       sy, 1.0, 0.0, 0.0,
                      0.0, 0.0, 1.0, 0.0,