public void MapView_Touch(object sender, TouchEventArgs args)
{
if (_gestureDetector.OnTouchEvent(args.Event))
{
return;
}
var touchPoints = GetMapPositions(args.Event, this);
switch (args.Event.Action)
{
case MotionEventActions.Up:
_canvas.Invalidate();
_mode = None;
_map.ViewChanged(true);
break;
case MotionEventActions.Down:
case MotionEventActions.Pointer1Down:
case MotionEventActions.Pointer2Down:
case MotionEventActions.Pointer3Down:
if (touchPoints.Count >= 2)
{
(_previousCenter, _previousRadius, _previousAngle) = GetPinchValues(touchPoints);
_mode = Zoom;
_innerRotation = _map.Viewport.Rotation;
}
else
{
_mode = Dragging;
_previousCenter = touchPoints.First();
}
break;
case MotionEventActions.Pointer1Up:
case MotionEventActions.Pointer2Up:
case MotionEventActions.Pointer3Up:
// Remove the touchPoint that was released from the locations to reset the
// starting points of the move and rotation
touchPoints.RemoveAt(args.Event.ActionIndex);
if (touchPoints.Count >= 2)
{
(_previousCenter, _previousRadius, _previousAngle) = GetPinchValues(touchPoints);
_mode = Zoom;
_innerRotation = _map.Viewport.Rotation;
}
else
{
_mode = Dragging;
_previousCenter = touchPoints.First();
}
break;
case MotionEventActions.Move:
switch (_mode)
{
case Dragging:
{
if (touchPoints.Count != 1)
{
return;
}
var touchPosition = touchPoints.First();
if (_previousCenter != null && !_previousCenter.IsEmpty())
{
_map.Viewport.Transform(touchPosition.X, touchPosition.Y, _previousCenter.X, _previousCenter.Y);
ViewportLimiter.LimitExtent(_map.Viewport, _map.PanMode, _map.PanLimits, _map.Envelope);
_canvas.Invalidate();
}
_previousCenter = touchPosition;
}
break;
case Zoom:
{
if (touchPoints.Count < 2)
{
return;
}
var(prevCenter, prevRadius, prevAngle) = (_previousCenter, _previousRadius, _previousAngle);
var(center, radius, angle) = GetPinchValues(touchPoints);
double rotationDelta = 0;
if (AllowPinchRotation)
{
_innerRotation += angle - prevAngle;
_innerRotation %= 360;
if (_innerRotation > 180)
{
_innerRotation -= 360;
}
else if (_innerRotation < -180)
{
_innerRotation += 360;
}
if (_map.Viewport.Rotation == 0 && Math.Abs(_innerRotation) >= Math.Abs(UnSnapRotationDegrees))
{
rotationDelta = _innerRotation;
}
else if (_map.Viewport.Rotation != 0)
{
if (Math.Abs(_innerRotation) <= Math.Abs(ReSnapRotationDegrees))
{
rotationDelta = -_map.Viewport.Rotation;
}
else
{
rotationDelta = _innerRotation - _map.Viewport.Rotation;
}
}
}
_map.Viewport.Transform(center.X, center.Y, prevCenter.X, prevCenter.Y, radius / prevRadius, rotationDelta);
(_previousCenter, _previousRadius, _previousAngle) = (center, radius, angle);
ViewportLimiter.Limit(_map.Viewport,
_map.ZoomMode, _map.ZoomLimits, _map.Resolutions,
_map.PanMode, _map.PanLimits, _map.Envelope);
_canvas.Invalidate();
}
break;
}
break;
}
}
/// <summary>
/// Called, when mouse/finger/pen moves over map
/// </summary>
/// <param name="touchPoints">List of all touched points</param>
private bool OnTouchMove(List <Geometries.Point> touchPoints)
{
var args = new TouchedEventArgs(touchPoints);
TouchMove?.Invoke(this, args);
if (args.Handled)
{
return(true);
}
switch (_mode)
{
case TouchMode.Dragging:
{
if (touchPoints.Count != 1)
{
return(false);
}
var touchPosition = touchPoints.First();
if (!Map.PanLock && _previousCenter != null && !_previousCenter.IsEmpty())
{
_viewport.Transform(touchPosition, _previousCenter);
RefreshGraphics();
}
_previousCenter = touchPosition;
}
break;
case TouchMode.Zooming:
{
if (touchPoints.Count != 2)
{
return(false);
}
var(prevCenter, prevRadius, prevAngle) = (_previousCenter, _previousRadius, _previousAngle);
var(center, radius, angle) = GetPinchValues(touchPoints);
double rotationDelta = 0;
if (!Map.RotationLock)
{
_innerRotation += angle - prevAngle;
_innerRotation %= 360;
if (_innerRotation > 180)
{
_innerRotation -= 360;
}
else if (_innerRotation < -180)
{
_innerRotation += 360;
}
if (Viewport.Rotation == 0 && Math.Abs(_innerRotation) >= Math.Abs(UnSnapRotationDegrees))
{
rotationDelta = _innerRotation;
}
else if (Viewport.Rotation != 0)
{
if (Math.Abs(_innerRotation) <= Math.Abs(ReSnapRotationDegrees))
{
rotationDelta = -Viewport.Rotation;
}
else
{
rotationDelta = _innerRotation - Viewport.Rotation;
}
}
}
_viewport.Transform(center, prevCenter, Map.ZoomLock ? 1 : radius / prevRadius, rotationDelta);
(_previousCenter, _previousRadius, _previousAngle) = (center, radius, angle);
RefreshGraphics();
}
break;
}
return(true);
}
/// <summary>
/// Called, when mouse/finger/pen moves over map
/// </summary>
/// <param name="touchPoints">List of all touched points</param>
private bool OnTouchMove(List <Geometries.Point> touchPoints)
{
var args = new TouchedEventArgs(touchPoints);
TouchMove?.Invoke(this, args);
if (args.Handled)
{
return(true);
}
switch (_mode)
{
case TouchMode.Dragging:
{
if (touchPoints.Count != 1)
{
return(false);
}
var touchPosition = touchPoints.First();
if (_previousCenter != null && !_previousCenter.IsEmpty())
{
_map.Viewport.Transform(touchPosition.X, touchPosition.Y, _previousCenter.X, _previousCenter.Y);
ViewportLimiter.LimitExtent(_map.Viewport, _map.PanMode, _map.PanLimits, _map.Envelope);
InvalidateCanvas();
}
_previousCenter = touchPosition;
}
break;
case TouchMode.Zooming:
{
if (touchPoints.Count < 2)
{
return(false);
}
var(prevCenter, prevRadius, prevAngle) = (_previousCenter, _previousRadius, _previousAngle);
var(center, radius, angle) = GetPinchValues(touchPoints);
double rotationDelta = 0;
if (RotationLock)
{
_innerRotation += angle - prevAngle;
_innerRotation %= 360;
if (_innerRotation > 180)
{
_innerRotation -= 360;
}
else if (_innerRotation < -180)
{
_innerRotation += 360;
}
if (_map.Viewport.Rotation == 0 && Math.Abs(_innerRotation) >= Math.Abs(UnSnapRotationDegrees))
{
rotationDelta = _innerRotation;
}
else if (_map.Viewport.Rotation != 0)
{
if (Math.Abs(_innerRotation) <= Math.Abs(ReSnapRotationDegrees))
{
rotationDelta = -_map.Viewport.Rotation;
}
else
{
rotationDelta = _innerRotation - _map.Viewport.Rotation;
}
}
}
_map.Viewport.Transform(center.X, center.Y, prevCenter.X, prevCenter.Y, radius / prevRadius, rotationDelta);
(_previousCenter, _previousRadius, _previousAngle) = (center, radius, angle);
ViewportLimiter.Limit(_map.Viewport,
_map.ZoomMode, _map.ZoomLimits, _map.Resolutions,
_map.PanMode, _map.PanLimits, _map.Envelope);
InvalidateCanvas();
}
break;
}
return(true);
}