[FEAT] Matrix add transpose

raytracing/src/matrix.cpp

@@ -173,6 +173,23 @@ const Tuple Matrix::operator*(const Tuple &a_tuple) const
 
 /* ------------------------------------------------------------------------- */
 
+bool Matrix::transpose(void)
+{
+    std::vector<std::vector<double>> the_copy = m_data;
+
+    for (int the_row = 0; the_row < m_rows; the_row++)
+    {
+        for (int the_col = 0; the_col < m_cols; the_col++)
+        {
+            m_data[the_col][the_row] = the_copy[the_row][the_col];
+        }
+    }
+
+    return true;
+}
+
+/* ------------------------------------------------------------------------- */
+
 Matrix Matrix::identity(void)
 {
     Matrix the_identity = {

raytracing/src/matrix.h

@@ -57,6 +57,8 @@ namespace Raytracer
         const Matrix operator*(const Matrix &a_matrix) const;
         const Tuple operator*(const Tuple &a_tuple) const;
 
+        bool transpose(void);
+
         static Matrix identity(void);
 
     private:

tests/03_matrix.cpp

@@ -194,3 +194,25 @@ TEST_CASE("[Matrix] Multiplying the identity matrix by a tuple", "[Matrix]")
 
     REQUIRE((Matrix::identity() * a) == a);
 }
+
+/* ------------------------------------------------------------------------- */
+
+TEST_CASE("[Matrix] Transposing a matrix", "[Matrix]")
+{
+    Matrix a = {
+        {0, 9, 3, 0},
+        {9, 8, 0, 8},
+        {1, 8, 5, 3},
+        {0, 0, 5, 8}
+    };
+    Matrix transposed = {
+        {0, 9, 1, 0},
+        {9, 8, 8, 0},
+        {3, 0, 5, 5},
+        {0, 8, 3, 8}
+    };
+
+    a.transpose();
+
+    REQUIRE(a == transposed);
+}