Method UpdateTransform

Source/Engine/UI/GUI/Control.Bounds.cs:525–602

Updates the control cached transformation matrix (based on bounds).

()

        /// Updates the control cached transformation matrix (based on bounds).
        /// </summary>
        [NoAnimate]
        public void UpdateTransform()
        {
            // Actual pivot and negative pivot
            //Float2.Multiply(ref _pivot, ref _bounds.Size, out var v1);
            //Float2.Negate(ref v1, out var v2);
            //Float2.Add(ref v1, ref _bounds.Location, out v1);
            var v1 = _pivot * _bounds.Size;
            var v2 = -v1;
            v1 += _bounds.Location;

            // ------ Matrix3x3 based version:

            /*
            // Negative pivot
            Matrix3x3 m1, m2;
            Matrix3x3.Translation2D(ref v2, out m1);

            // Scale
            Matrix3x3.Scaling(_scale.X, _scale.Y, 1, out m2);
            Matrix3x3.Multiply(ref m1, ref m2, out m1);

            // Shear
            Matrix3x3.Shear(ref _shear, out m2);
            Matrix3x3.Multiply(ref m1, ref m2, out m1);

            // Rotation
            Matrix3x3.RotationZ(_rotation * Mathf.DegreesToRadians, out m2);
            Matrix3x3.Multiply(ref m1, ref m2, out m1);

            // Pivot + Location
            Matrix3x3.Translation2D(ref v1, out m2);
            Matrix3x3.Multiply(ref m1, ref m2, out _cachedTransform);
            */

            // ------ Matrix2x2 based version:

            // 2D transformation

            //Matrix2x2.Scale(ref _scale, out Matrix2x2 m1);
            //Matrix2x2.Shear(ref _shear, out Matrix2x2 m2);
            //Matrix2x2.Multiply(ref m1, ref m2, out m1);

            // Scale and Shear
            Matrix3x3 m1 = new Matrix3x3
                (
                _scale.X,
                _scale.X * (_shear.Y == 0 ? 0 : (1.0f / Mathf.Tan(Mathf.DegreesToRadians * (90 - Mathf.Clamp(_shear.Y, -89.0f, 89.0f))))),
                0,
                _scale.Y * (_shear.X == 0 ? 0 : (1.0f / Mathf.Tan(Mathf.DegreesToRadians * (90 - Mathf.Clamp(_shear.X, -89.0f, 89.0f))))),
                _scale.Y,
                0, 0, 0, 1
                );

            
            //Matrix2x2.Rotation(Mathf.DegreesToRadians * _rotation, out m2);
            float sin = Mathf.Sin(Mathf.DegreesToRadians * _rotation);
            float cos = Mathf.Cos(Mathf.DegreesToRadians * _rotation);