1 files changed, 33 insertions, 0 deletions
diff --git a/Assets/Scripts/Common/Matrix2x3.cs b/Assets/Scripts/Common/Matrix2x3.cs
new file mode 100644
index 0000000..ec2cb69
--- /dev/null
+++ b/Assets/Scripts/Common/Matrix2x3.cs
@@ -0,0 +1,33 @@
+using UnityEngine;
+
+namespace Coffee.UIEffects
+{
+    /// <summary>
+    /// Matrix2x3.
+    /// </summary>
+    public struct Matrix2x3
+    {
+        public float m00, m01, m02, m10, m11, m12;
+
+        public Matrix2x3(Rect rect, float cos, float sin)
+        {
+            const float center = 0.5f;
+            float dx = -rect.xMin / rect.width - center;
+            float dy = -rect.yMin / rect.height - center;
+            m00 = cos / rect.width;
+            m01 = -sin / rect.height;
+            m02 = dx * cos - dy * sin + center;
+            m10 = sin / rect.width;
+            m11 = cos / rect.height;
+            m12 = dx * sin + dy * cos + center;
+        }
+
+        public static Vector2 operator *(Matrix2x3 m, Vector2 v)
+        {
+            return new Vector2(
+                (m.m00 * v.x) + (m.m01 * v.y) + m.m02,
+                (m.m10 * v.x) + (m.m11 * v.y) + m.m12
+            );
+        }
+    }
+}