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107 lines
4.0 KiB
107 lines
4.0 KiB
using System;
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using SkiaSharp;
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namespace TheGameExtreme.view
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{
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public class TouchManipulationManager
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{
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public TouchManipulationMode Mode { set; get; }
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//float Magnitude(SKPoint point)
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//{
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// return (float)Math.Sqrt(Math.Pow(point.X, 2) + Math.Pow(point.Y, 2));
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//}
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public SKMatrix OneFingerManipulate(SKPoint prevPoint, SKPoint newPoint, SKPoint pivotPoint)
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{
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if (Mode == TouchManipulationMode.None)
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{
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return SKMatrix.MakeIdentity();
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}
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SKMatrix touchMatrix = SKMatrix.MakeIdentity();
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SKPoint delta = newPoint - prevPoint;
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//if (Mode == TouchManipulationMode.ScaleDualRotate) // One-finger rotation
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//{
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// SKPoint oldVector = prevPoint - pivotPoint;
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// SKPoint newVector = newPoint - pivotPoint;
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// // Avoid rotation if fingers are too close to center
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// if (Magnitude(newVector) > 25 && Magnitude(oldVector) > 25)
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// {
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// float prevAngle = (float)Math.Atan2(oldVector.Y, oldVector.X);
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// float newAngle = (float)Math.Atan2(newVector.Y, newVector.X);
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// // Calculate rotation matrix
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// float angle = newAngle - prevAngle;
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// touchMatrix = SKMatrix.MakeRotation(angle, pivotPoint.X, pivotPoint.Y);
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// // Effectively rotate the old vector
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// float magnitudeRatio = Magnitude(oldVector) / Magnitude(newVector);
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// oldVector.X = magnitudeRatio * newVector.X;
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// oldVector.Y = magnitudeRatio * newVector.Y;
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// // Recalculate delta
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// delta = newVector - oldVector;
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// }
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//}
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// Multiply the rotation matrix by a translation matrix
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SKMatrix.PostConcat(ref touchMatrix, SKMatrix.MakeTranslation(delta.X, delta.Y));
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return touchMatrix;
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}
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public SKMatrix TwoFingerManipulate(SKPoint prevPoint, SKPoint newPoint, SKPoint pivotPoint)
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{
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SKMatrix touchMatrix = SKMatrix.MakeIdentity();
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//SKPoint oldVector = prevPoint - pivotPoint;
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//SKPoint newVector = newPoint - pivotPoint;
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//if (Mode == TouchManipulationMode.ScaleRotate ||
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// Mode == TouchManipulationMode.ScaleDualRotate)
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//{
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// // Find angles from pivot point to touch points
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// float oldAngle = (float)Math.Atan2(oldVector.Y, oldVector.X);
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// float newAngle = (float)Math.Atan2(newVector.Y, newVector.X);
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// // Calculate rotation matrix
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// float angle = newAngle - oldAngle;
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// touchMatrix = SKMatrix.MakeRotation(angle, pivotPoint.X, pivotPoint.Y);
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// // Effectively rotate the old vector
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// float magnitudeRatio = Magnitude(oldVector) / Magnitude(newVector);
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// oldVector.X = magnitudeRatio * newVector.X;
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// oldVector.Y = magnitudeRatio * newVector.Y;
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//}
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float scaleX = 1;
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float scaleY = 1;
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//if (Mode == TouchManipulationMode.AnisotropicScale)
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//{
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// scaleX = newVector.X / oldVector.X;
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// scaleY = newVector.Y / oldVector.Y;
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//}
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//else if (Mode == TouchManipulationMode.IsotropicScale ||
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// Mode == TouchManipulationMode.ScaleRotate ||
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// Mode == TouchManipulationMode.ScaleDualRotate)
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//{
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// scaleX = scaleY = Magnitude(newVector) / Magnitude(oldVector);
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//}
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if (!float.IsNaN(scaleX) && !float.IsInfinity(scaleX) &&
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!float.IsNaN(scaleY) && !float.IsInfinity(scaleY))
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{
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SKMatrix.PostConcat(ref touchMatrix,
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SKMatrix.MakeScale(scaleX, scaleY, pivotPoint.X, pivotPoint.Y));
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}
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return touchMatrix;
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}
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}
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} |