From 789895b4b9f99668b8b772f271d07d1ce3115742 Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Fri, 5 Oct 2018 15:40:31 +0800
Subject: *update

---
 src/libjin/Math/Matrix.cpp | 17 +++++++++++++++++
 src/libjin/Math/Matrix.h   |  6 ++++++
 2 files changed, 23 insertions(+)

(limited to 'src/libjin/Math')

diff --git a/src/libjin/Math/Matrix.cpp b/src/libjin/Math/Matrix.cpp
index 39042f0..a80f37a 100644
--- a/src/libjin/Math/Matrix.cpp
+++ b/src/libjin/Math/Matrix.cpp
@@ -8,6 +8,8 @@ namespace jin
 namespace math
 {
 
+	const Matrix Matrix::Identity;
+
     // | e0 e4 e8  e12 |
     // | e1 e5 e9  e13 |
     // | e2 e6 e10 e14 |
@@ -22,6 +24,21 @@ namespace math
     {
     }
 
+    void Matrix::setOrtho(float l, float r, float b, float t, float n, float f)
+    {
+		float w = r - l; 
+		float h = t - b;
+		float z = f - n;
+        setIdentity();
+        e[0] = 2 / w;
+        e[5] = 2 / h;
+        e[10] = -2 / z;
+        e[12] = -(r + l) / w;
+        e[13] = -(t + b) / h;
+        e[14] = -(f + n) / z;
+		e[15] = 1;
+    }
+
     //                 | e0 e4 e8  e12 |
     //                 | e1 e5 e9  e13 |
     //                 | e2 e6 e10 e14 |
diff --git a/src/libjin/Math/Matrix.h b/src/libjin/Math/Matrix.h
index b9a55d4..52fc9c8 100644
--- a/src/libjin/Math/Matrix.h
+++ b/src/libjin/Math/Matrix.h
@@ -16,6 +16,8 @@ namespace math
     * This class is the basis for all transformations in LOVE. Althought not
     * really needed for 2D, it contains 4x4 elements to be compatible with
     * OpenGL without conversions.
+    * 不需要转置的矩阵
+    * https://blog.csdn.net/candycat1992/article/details/8830894
     **/
     class Matrix
     {
@@ -31,6 +33,8 @@ namespace math
 
     public:
 
+		static const Matrix Identity;
+
         /**
         * Creates a new identity matrix.
         **/
@@ -41,6 +45,8 @@ namespace math
         **/
         ~Matrix();
 
+        void setOrtho(float _left, float _right, float _bottom, float _top, float _near, float _far);
+
         /**
         * Multiplies this Matrix with another Matrix, changing neither.
         * @param m The Matrix to multiply with this Matrix.
-- 
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