//using System;
//using SkiaSharp;

//namespace TheGameExtreme.view
//{
//    public class TouchManipulationManager
//    {

//        public TouchManipulationMode Mode { set; get; }

//        //float Magnitude(SKPoint point)
//        //{
//        //    return (float)Math.Sqrt(Math.Pow(point.X, 2) + Math.Pow(point.Y, 2));
//        //}

//        public SKMatrix OneFingerManipulate(SKPoint prevPoint, SKPoint newPoint, SKPoint pivotPoint)
//        {
//            if (Mode == TouchManipulationMode.None)
//            {
//                return SKMatrix.MakeIdentity();
//            }

//            SKMatrix touchMatrix = SKMatrix.MakeIdentity();
//            SKPoint delta = newPoint - prevPoint;

//            //if (Mode == TouchManipulationMode.ScaleDualRotate)  // One-finger rotation
//            //{
//            //    SKPoint oldVector = prevPoint - pivotPoint;
//            //    SKPoint newVector = newPoint - pivotPoint;

//            //    // Avoid rotation if fingers are too close to center
//            //    if (Magnitude(newVector) > 25 && Magnitude(oldVector) > 25)
//            //    {
//            //        float prevAngle = (float)Math.Atan2(oldVector.Y, oldVector.X);
//            //        float newAngle = (float)Math.Atan2(newVector.Y, newVector.X);

//            //        // Calculate rotation matrix
//            //        float angle = newAngle - prevAngle;
//            //        touchMatrix = SKMatrix.MakeRotation(angle, pivotPoint.X, pivotPoint.Y);

//            //        // Effectively rotate the old vector
//            //        float magnitudeRatio = Magnitude(oldVector) / Magnitude(newVector);
//            //        oldVector.X = magnitudeRatio * newVector.X;
//            //        oldVector.Y = magnitudeRatio * newVector.Y;

//            //        // Recalculate delta
//            //        delta = newVector - oldVector;
//            //    }
//            //}

//            // Multiply the rotation matrix by a translation matrix
//            SKMatrix.PostConcat(ref touchMatrix, SKMatrix.MakeTranslation(delta.X, delta.Y));

//            return touchMatrix;
//        }

//        public SKMatrix TwoFingerManipulate(SKPoint prevPoint, SKPoint newPoint, SKPoint pivotPoint)
//        {
//            SKMatrix touchMatrix = SKMatrix.MakeIdentity();
//            //SKPoint oldVector = prevPoint - pivotPoint;
//            //SKPoint newVector = newPoint - pivotPoint;

//            //if (Mode == TouchManipulationMode.ScaleRotate ||
//            //    Mode == TouchManipulationMode.ScaleDualRotate)
//            //{
//            //    // Find angles from pivot point to touch points
//            //    float oldAngle = (float)Math.Atan2(oldVector.Y, oldVector.X);
//            //    float newAngle = (float)Math.Atan2(newVector.Y, newVector.X);

//            //    // Calculate rotation matrix
//            //    float angle = newAngle - oldAngle;
//            //    touchMatrix = SKMatrix.MakeRotation(angle, pivotPoint.X, pivotPoint.Y);

//            //    // Effectively rotate the old vector
//            //    float magnitudeRatio = Magnitude(oldVector) / Magnitude(newVector);
//            //    oldVector.X = magnitudeRatio * newVector.X;
//            //    oldVector.Y = magnitudeRatio * newVector.Y;
//            //}

//            float scaleX = 1;
//            float scaleY = 1;

//            //if (Mode == TouchManipulationMode.AnisotropicScale)
//            //{
//            //    scaleX = newVector.X / oldVector.X;
//            //    scaleY = newVector.Y / oldVector.Y;

//            //}
//            //else if (Mode == TouchManipulationMode.IsotropicScale ||
//            //         Mode == TouchManipulationMode.ScaleRotate ||
//            //         Mode == TouchManipulationMode.ScaleDualRotate)
//            //{
//            //    scaleX = scaleY = Magnitude(newVector) / Magnitude(oldVector);
//            //}

//            if (!float.IsNaN(scaleX) && !float.IsInfinity(scaleX) &&
//                !float.IsNaN(scaleY) && !float.IsInfinity(scaleY))
//            {
//                SKMatrix.PostConcat(ref touchMatrix,
//                SKMatrix.MakeScale(scaleX, scaleY, pivotPoint.X, pivotPoint.Y));
//            }

//            return touchMatrix;
//        }

//    }
//}