Fix consistency of translated/scaled/rotated in Transform2D and Transform3D

2 files changed, 100 insertions, 15 deletions

diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/Transform2D.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/Transform2D.cs
index b8413f1e16..68d097eb4e 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/Transform2D.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/Transform2D.cs
@@ -297,7 +297,9 @@ namespace Godot
         }
 
         /// <summary>
-        /// Rotates the transform by <paramref name="angle"/> (in radians), using matrix multiplication.
+        /// Rotates the transform by <paramref name="angle"/> (in radians).
+        /// The operation is done in the parent/global frame, equivalent to
+        /// multiplying the matrix from the left.
         /// </summary>
         /// <param name="angle">The angle to rotate, in radians.</param>
         /// <returns>The rotated transformation matrix.</returns>
@@ -307,7 +309,21 @@ namespace Godot
         }
 
         /// <summary>
-        /// Scales the transform by the given scaling factor, using matrix multiplication.
+        /// Rotates the transform by <paramref name="angle"/> (in radians).
+        /// The operation is done in the local frame, equivalent to
+        /// multiplying the matrix from the right.
+        /// </summary>
+        /// <param name="angle">The angle to rotate, in radians.</param>
+        /// <returns>The rotated transformation matrix.</returns>
+        public Transform2D RotatedLocal(real_t angle)
+        {
+            return new Transform2D(angle, new Vector2()) * this;
+        }
+
+        /// <summary>
+        /// Scales the transform by the given scaling factor.
+        /// The operation is done in the parent/global frame, equivalent to
+        /// multiplying the matrix from the left.
         /// </summary>
         /// <param name="scale">The scale to introduce.</param>
         /// <returns>The scaled transformation matrix.</returns>
@@ -320,6 +336,21 @@ namespace Godot
             return copy;
         }
 
+        /// <summary>
+        /// Scales the transform by the given scaling factor.
+        /// The operation is done in the local frame, equivalent to
+        /// multiplying the matrix from the right.
+        /// </summary>
+        /// <param name="scale">The scale to introduce.</param>
+        /// <returns>The scaled transformation matrix.</returns>
+        public Transform2D ScaledLocal(Vector2 scale)
+        {
+            Transform2D copy = this;
+            copy.x *= scale;
+            copy.y *= scale;
+            return copy;
+        }
+
         private real_t Tdotx(Vector2 with)
         {
             return (this[0, 0] * with[0]) + (this[1, 0] * with[1]);
@@ -331,11 +362,23 @@ namespace Godot
         }
 
         /// <summary>
-        /// Translates the transform by the given <paramref name="offset"/>,
-        /// relative to the transform's basis vectors.
-        ///
-        /// Unlike <see cref="Rotated"/> and <see cref="Scaled"/>,
-        /// this does not use matrix multiplication.
+        /// Translates the transform by the given <paramref name="offset"/>.
+        /// The operation is done in the parent/global frame, equivalent to
+        /// multiplying the matrix from the left.
+        /// </summary>
+        /// <param name="offset">The offset to translate by.</param>
+        /// <returns>The translated matrix.</returns>
+        public Transform2D Translated(Vector2 offset)
+        {
+            Transform2D copy = this;
+            copy.origin += offset;
+            return copy;
+        }
+
+        /// <summary>
+        /// Translates the transform by the given <paramref name="offset"/>.
+        /// The operation is done in the local frame, equivalent to
+        /// multiplying the matrix from the right.
         /// </summary>
         /// <param name="offset">The offset to translate by.</param>
         /// <returns>The translated matrix.</returns>
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/Transform3D.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/Transform3D.cs
index 97b4a87713..c00b9d8e9b 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/Transform3D.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/Transform3D.cs
@@ -186,8 +186,10 @@ namespace Godot
         }
 
         /// <summary>
-        /// Rotates the transform around the given <paramref name="axis"/> by <paramref name="angle"/> (in radians),
-        /// using matrix multiplication. The axis must be a normalized vector.
+        /// Rotates the transform around the given <paramref name="axis"/> by <paramref name="angle"/> (in radians).
+        /// The axis must be a normalized vector.
+        /// The operation is done in the parent/global frame, equivalent to
+        /// multiplying the matrix from the left.
         /// </summary>
         /// <param name="axis">The axis to rotate around. Must be normalized.</param>
         /// <param name="angle">The angle to rotate, in radians.</param>
@@ -198,7 +200,24 @@ namespace Godot
         }
 
         /// <summary>
-        /// Scales the transform by the given 3D scaling factor, using matrix multiplication.
+        /// Rotates the transform around the given <paramref name="axis"/> by <paramref name="angle"/> (in radians).
+        /// The axis must be a normalized vector.
+        /// The operation is done in the local frame, equivalent to
+        /// multiplying the matrix from the right.
+        /// </summary>
+        /// <param name="axis">The axis to rotate around. Must be normalized.</param>
+        /// <param name="angle">The angle to rotate, in radians.</param>
+        /// <returns>The rotated transformation matrix.</returns>
+        public Transform3D RotatedLocal(Vector3 axis, real_t angle)
+        {
+            Basis tmpBasis = new Basis(axis, angle);
+            return new Transform3D(basis * tmpBasis, origin);
+        }
+
+        /// <summary>
+        /// Scales the transform by the given 3D <paramref name="scale"/> factor.
+        /// The operation is done in the parent/global frame, equivalent to
+        /// multiplying the matrix from the left.
         /// </summary>
         /// <param name="scale">The scale to introduce.</param>
         /// <returns>The scaled transformation matrix.</returns>
@@ -207,6 +226,19 @@ namespace Godot
             return new Transform3D(basis.Scaled(scale), origin * scale);
         }
 
+        /// <summary>
+        /// Scales the transform by the given 3D <paramref name="scale"/> factor.
+        /// The operation is done in the local frame, equivalent to
+        /// multiplying the matrix from the right.
+        /// </summary>
+        /// <param name="scale">The scale to introduce.</param>
+        /// <returns>The scaled transformation matrix.</returns>
+        public Transform3D ScaledLocal(Vector3 scale)
+        {
+            Basis tmpBasis = new Basis(new Vector3(scale.x, 0, 0), new Vector3(0, scale.y, 0), new Vector3(0, 0, scale.z));
+            return new Transform3D(basis * tmpBasis, origin);
+        }
+
         private void SetLookAt(Vector3 eye, Vector3 target, Vector3 up)
         {
             // Make rotation matrix
@@ -231,11 +263,21 @@ namespace Godot
         }
 
         /// <summary>
-        /// Translates the transform by the given <paramref name="offset"/>,
-        /// relative to the transform's basis vectors.
-        ///
-        /// Unlike <see cref="Rotated"/> and <see cref="Scaled"/>,
-        /// this does not use matrix multiplication.
+        /// Translates the transform by the given <paramref name="offset"/>.
+        /// The operation is done in the parent/global frame, equivalent to
+        /// multiplying the matrix from the left.
+        /// </summary>
+        /// <param name="offset">The offset to translate by.</param>
+        /// <returns>The translated matrix.</returns>
+        public Transform3D Translated(Vector3 offset)
+        {
+            return new Transform3D(basis, origin + offset);
+        }
+
+        /// <summary>
+        /// Translates the transform by the given <paramref name="offset"/>.
+        /// The operation is done in the local frame, equivalent to
+        /// multiplying the matrix from the right.
         /// </summary>
         /// <param name="offset">The offset to translate by.</param>
         /// <returns>The translated matrix.</returns>