Add Rotate(degrees, origin)

src/ImageSharp/Processing/AffineTransformBuilder.cs

@@ -35,7 +35,16 @@ namespace SixLabors.ImageSharp.Processing
             => this.Prepend(size => TransformUtils.CreateRotationMatrixRadians(radians, size));
 
         /// <summary>
-        /// Prepends a centered rotation matrix using the given rotation in radians.
+        /// Prepends a rotation matrix using the given rotation in degrees at the given origin.
+        /// </summary>
+        /// <param name="degrees">The amount of rotation, in degrees.</param>
+        /// <param name="origin">The rotation origin point.</param>
+        /// <returns>The <see cref="AffineTransformBuilder"/>.</returns>
+        public AffineTransformBuilder PrependRotationDegrees(float degrees, Vector2 origin)
+            => this.PrependRotationRadians(GeometryUtilities.DegreeToRadian(degrees), origin);
+
+        /// <summary>
+        /// Prepends a rotation matrix using the given rotation in radians at the given origin.
         /// </summary>
         /// <param name="radians">The amount of rotation, in radians.</param>
         /// <param name="origin">The rotation origin point.</param>
@@ -62,7 +71,16 @@ namespace SixLabors.ImageSharp.Processing
             => this.Append(size => TransformUtils.CreateRotationMatrixRadians(radians, size));
 
         /// <summary>
-        /// Appends a centered rotation matrix using the given rotation in radians.
+        /// Appends a rotation matrix using the given rotation in degrees at the given origin.
+        /// </summary>
+        /// <param name="degrees">The amount of rotation, in degrees.</param>
+        /// <param name="origin">The rotation origin point.</param>
+        /// <returns>The <see cref="AffineTransformBuilder"/>.</returns>
+        public AffineTransformBuilder AppendRotationDegrees(float degrees, Vector2 origin)
+            => this.AppendRotationRadians(GeometryUtilities.DegreeToRadian(degrees), origin);
+
+        /// <summary>
+        /// Appends a rotation matrix using the given rotation in radians at the given origin.
         /// </summary>
         /// <param name="radians">The amount of rotation, in radians.</param>
         /// <param name="origin">The rotation origin point.</param>

src/ImageSharp/Processing/ProjectiveTransformBuilder.cs

@@ -53,13 +53,22 @@ namespace SixLabors.ImageSharp.Processing
             => this.Prepend(size => new Matrix4x4(TransformUtils.CreateRotationMatrixRadians(radians, size)));
 
         /// <summary>
-        /// Appends a centered rotation matrix using the given rotation in radians.
+        /// Prepends a centered rotation matrix using the given rotation in degrees at the given origin.
+        /// </summary>
+        /// <param name="degrees">The amount of rotation, in radians.</param>
+        /// <param name="origin">The rotation origin point.</param>
+        /// <returns>The <see cref="ProjectiveTransformBuilder"/>.</returns>
+        internal ProjectiveTransformBuilder PrependRotationDegrees(float degrees, Vector2 origin)
+            => this.PrependRotationRadians(GeometryUtilities.DegreeToRadian(degrees), origin);
+
+        /// <summary>
+        /// Prepends a centered rotation matrix using the given rotation in radians at the given origin.
         /// </summary>
         /// <param name="radians">The amount of rotation, in radians.</param>
-        /// <param name="centerPoint">The rotation center.</param>
+        /// <param name="origin">The rotation origin point.</param>
         /// <returns>The <see cref="ProjectiveTransformBuilder"/>.</returns>
-        internal ProjectiveTransformBuilder PrependRotationRadians(float radians, Vector2 centerPoint)
-            => this.PrependMatrix(Matrix4x4.CreateRotationZ(radians, new Vector3(centerPoint, 0)));
+        internal ProjectiveTransformBuilder PrependRotationRadians(float radians, Vector2 origin)
+            => this.PrependMatrix(Matrix4x4.CreateRotationZ(radians, new Vector3(origin, 0)));
 
         /// <summary>
         /// Appends a centered rotation matrix using the given rotation in degrees.
@@ -78,13 +87,22 @@ namespace SixLabors.ImageSharp.Processing
             => this.Append(size => new Matrix4x4(TransformUtils.CreateRotationMatrixRadians(radians, size)));
 
         /// <summary>
-        /// Appends a centered rotation matrix using the given rotation in radians.
+        /// Appends a centered rotation matrix using the given rotation in degrees at the given origin.
+        /// </summary>
+        /// <param name="degrees">The amount of rotation, in radians.</param>
+        /// <param name="origin">The rotation origin point.</param>
+        /// <returns>The <see cref="ProjectiveTransformBuilder"/>.</returns>
+        internal ProjectiveTransformBuilder AppendRotationDegrees(float degrees, Vector2 origin)
+            => this.AppendRotationRadians(GeometryUtilities.DegreeToRadian(degrees), origin);
+
+        /// <summary>
+        /// Appends a centered rotation matrix using the given rotation in radians at the given origin.
         /// </summary>
         /// <param name="radians">The amount of rotation, in radians.</param>
-        /// <param name="centerPoint">The rotation center.</param>
+        /// <param name="origin">The rotation origin point.</param>
         /// <returns>The <see cref="ProjectiveTransformBuilder"/>.</returns>
-        internal ProjectiveTransformBuilder AppendRotationRadians(float radians, Vector2 centerPoint)
-            => this.AppendMatrix(Matrix4x4.CreateRotationZ(radians, new Vector3(centerPoint, 0)));
+        internal ProjectiveTransformBuilder AppendRotationRadians(float radians, Vector2 origin)
+            => this.AppendMatrix(Matrix4x4.CreateRotationZ(radians, new Vector3(origin, 0)));
 
         /// <summary>
         /// Prepends a scale matrix from the given uniform scale.

tests/ImageSharp.Tests/Processing/Transforms/AffineTransformBuilderTests.cs

@@ -15,8 +15,11 @@ namespace SixLabors.ImageSharp.Tests.Processing.Transforms
 
         protected override void AppendRotationRadians(AffineTransformBuilder builder, float radians) => builder.AppendRotationRadians(radians);
 
-        protected override void AppendRotationRadians(AffineTransformBuilder builder, float radians, Vector2 center) =>
-            builder.AppendRotationRadians(radians, center);
+        protected override void AppendRotationRadians(AffineTransformBuilder builder, float radians, Vector2 origin) => builder.AppendRotationRadians(radians, origin);
+
+        protected override void AppendRotationDegrees(AffineTransformBuilder builder, float degrees) => builder.AppendRotationDegrees(degrees);
+
+        protected override void AppendRotationDegrees(AffineTransformBuilder builder, float degrees, Vector2 origin) => builder.AppendRotationDegrees(degrees, origin);
 
         protected override void PrependTranslation(AffineTransformBuilder builder, PointF translate) => builder.PrependTranslation(translate);
 

tests/ImageSharp.Tests/Processing/Transforms/ProjectiveTransformBuilderTests.cs

@@ -17,8 +17,11 @@ namespace SixLabors.ImageSharp.Tests.Processing.Transforms
 
         protected override void AppendRotationRadians(ProjectiveTransformBuilder builder, float radians) => builder.AppendRotationRadians(radians);
 
-        protected override void AppendRotationRadians(ProjectiveTransformBuilder builder, float radians, Vector2 center) =>
-            builder.AppendRotationRadians(radians, center);
+        protected override void AppendRotationRadians(ProjectiveTransformBuilder builder, float radians, Vector2 origin) => builder.AppendRotationRadians(radians, origin);
+
+        protected override void AppendRotationDegrees(ProjectiveTransformBuilder builder, float degrees) => builder.AppendRotationDegrees(degrees);
+
+        protected override void AppendRotationDegrees(ProjectiveTransformBuilder builder, float degrees, Vector2 origin) => builder.AppendRotationDegrees(degrees, origin);
 
         protected override void PrependTranslation(ProjectiveTransformBuilder builder, PointF translate) => builder.PrependTranslation(translate);
 

tests/ImageSharp.Tests/Processing/Transforms/TransformBuilderTestBase.cs

@@ -186,7 +186,7 @@ namespace SixLabors.ImageSharp.Tests.Processing.Transforms
 
         protected abstract void AppendRotationRadians(TBuilder builder, float radians);
 
-        protected abstract void AppendRotationRadians(TBuilder builder, float radians, Vector2 center);
+        protected abstract void AppendRotationRadians(TBuilder builder, float radians, Vector2 origin);
 
         protected abstract void PrependTranslation(TBuilder builder, PointF translate);
 
@@ -196,11 +196,9 @@ namespace SixLabors.ImageSharp.Tests.Processing.Transforms
 
         protected abstract void PrependRotationRadians(TBuilder builder, float radians, Vector2 origin);
 
-        protected virtual void AppendRotationDegrees(TBuilder builder, float degrees) =>
-            this.AppendRotationRadians(builder, GeometryUtilities.DegreeToRadian(degrees));
+        protected abstract void AppendRotationDegrees(TBuilder builder, float degrees);
 
-        protected virtual void AppendRotationDegrees(TBuilder builder, float degrees, Vector2 center) =>
-            this.AppendRotationRadians(builder, GeometryUtilities.DegreeToRadian(degrees), center);
+        protected abstract void AppendRotationDegrees(TBuilder builder, float degrees, Vector2 origin);
 
         protected abstract Vector2 Execute(TBuilder builder, Rectangle rectangle, Vector2 sourcePoint);
     }