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feat: views tpuchscreen zoom and pan

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amkovkov
2026-02-09 12:50:55 +03:00
parent 6a6cf2e78a
commit 83186538ee
3 changed files with 172 additions and 29 deletions
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GSS2.UI.Core/OpenCvImage.cs
+81 -14
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@@ -7,6 +7,8 @@ using Avalonia.Media.Imaging;
using Mat = OpenCvSharp.Mat;
using Cv2 = OpenCvSharp.Cv2;
using GSS2.Core.Extentions;
namespace GSS2.UI.Core;
public class OpenCvImage : Control
@@ -25,7 +27,8 @@ public class OpenCvImage : Control
{ }
}
private Point? _lastPosition = null;
private Point? _lastmousePosition = null;
private Dictionary<int, Point>? _lastTouchPositions = null;
private float _zoom = 1;
private float _panX = 0;
private float _panY = 0;
@@ -58,7 +61,14 @@ public class OpenCvImage : Control
public OpenCvImage()
: base()
{ }
{
DoubleTapped += (_, _) =>
{
_zoom = 1f;
_panX = 0f;
_panY = 0f;
};
}
protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)
{
@@ -124,10 +134,6 @@ public class OpenCvImage : Control
_panY = 0f;
}
}
else if (ea.Pointer.Type == PointerType.Touch)
{
Console.WriteLine(string.Format("PointerWheelChanged Type Touch {} {}", ea.GetPosition(this), ea.Delta));
}
base.OnPointerWheelChanged(ea);
InvalidateVisual();
}
@@ -144,12 +150,18 @@ public class OpenCvImage : Control
_panY = 0f;
}
else
_lastPosition = ea.GetPosition(this);
_lastmousePosition = ea.GetPosition(this);
}
}
else if (ea.Pointer.Type == PointerType.Touch)
{
if (_lastTouchPositions is null)
_lastTouchPositions = new Dictionary<int, Point>();
if (!_lastTouchPositions.ContainsKey(ea.Pointer.Id) && _lastTouchPositions.Count() < 2)
_lastTouchPositions.Add(ea.Pointer.Id, ea.GetPosition(this));
else if (_lastTouchPositions.ContainsKey(ea.Pointer.Id))
_lastTouchPositions[ea.Pointer.Id] = ea.GetPosition(this);
}
base.OnPointerPressed(ea);
InvalidateVisual();
@@ -159,11 +171,12 @@ public class OpenCvImage : Control
if (ea.Pointer.Type == PointerType.Mouse)
{
if (!ea.Properties.IsLeftButtonPressed)
_lastPosition = null;
_lastmousePosition = null;
}
else if (ea.Pointer.Type == PointerType.Touch)
{
if (_lastTouchPositions is not null && _lastTouchPositions.ContainsKey(ea.Pointer.Id))
_lastTouchPositions.Remove(ea.Pointer.Id);
}
base.OnPointerReleased(ea);
InvalidateVisual();
@@ -172,21 +185,75 @@ public class OpenCvImage : Control
{
if (ea.Pointer.Type == PointerType.Mouse)
{
if (_lastPosition is null || _zoom == 1) // Если кнопка не нажата или зум == 1, то ничего не делаем
if (_lastmousePosition is null || _zoom == 1) // Если кнопка не нажата или зум == 1, то ничего не делаем
{
base.OnPointerMoved(ea);
return;
}
var position = ea.GetPosition(this);
_panX -= (float)(_lastPosition.Value.X - position.X);
_panY -= (float)(_lastPosition.Value.Y - position.Y);
_lastPosition = position;
base.OnPointerMoved(ea);
_panX -= (float)(_lastmousePosition.Value.X - position.X);
_panY -= (float)(_lastmousePosition.Value.Y - position.Y);
_lastmousePosition = position;
}
else if (ea.Pointer.Type == PointerType.Touch)
{
if (_lastTouchPositions is null)
{
base.OnPointerMoved(ea);
return;
}
if (!_lastTouchPositions.ContainsKey(ea.Pointer.Id) && _lastTouchPositions.Count() < 2)
{
_lastTouchPositions.Add(ea.Pointer.Id, ea.GetPosition(this));
base.OnPointerMoved(ea);
return;
}
if (_lastTouchPositions.Count() == 1 && _zoom != 1) // Если есть только одно прикосновение и зум != 1, то токлько перемещение
{
var position = ea.GetPosition(this);
_panX -= (float)(_lastTouchPositions[ea.Pointer.Id].X - position.X);
_panY -= (float)(_lastTouchPositions[ea.Pointer.Id].Y - position.Y); // Ось Y инвертированна
_lastTouchPositions[ea.Pointer.Id] = position;
}
else if (_lastTouchPositions.Count() == 2) // Если два прикосновения, то перемещение с приближением
{
var lastPosition1 = _lastTouchPositions.Skip(0).First().Value;
var lastPosition2 = _lastTouchPositions.Skip(1).First().Value;
var lastDistance = Point.Distance(lastPosition1, lastPosition2);
var lastCenter = PointHelper.Center(lastPosition1, lastPosition2);
_lastTouchPositions[ea.Pointer.Id] = ea.GetPosition(this);
var newPosition1 = _lastTouchPositions.Skip(0).First().Value;
var newPosition2 = _lastTouchPositions.Skip(1).First().Value;
var newDistance = Point.Distance(newPosition1, newPosition2);
var newCenter = PointHelper.Center(newPosition1, newPosition2);
var zoomFactor = newDistance / lastDistance;
var newZoom = (float)(_zoom * zoomFactor);
newZoom = (float)Math.Clamp(newZoom, 1f, 10f);
var imageX = (newCenter.X - Bounds.Width / 2 - _panX) / _zoom;
var imageY = (newCenter.Y - Bounds.Height / 2 - _panY) / _zoom;
_zoom = newZoom;
if (_zoom > 1f)
{
_panX = (float)(newCenter.X - Bounds.Width / 2 - imageX * _zoom);
_panY = (float)(newCenter.Y - Bounds.Height / 2 - imageY * _zoom);
}
else
{
_zoom = 1f;
_panX = 0f;
_panY = 0f;
}
}
}
base.OnPointerMoved(ea);
InvalidateVisual();
}