public void TestRestrictZoom()
{
// arrange
var viewport = new Viewport {
Center = new Point(0, 0), Width = 100, Height = 100, Resolution = 1
};
// viewport.Center is (0, 0) at this point
var restrictTo = new BoundingBox(20, 40, 120, 140); // Minimal X value is 20, Minimal Y value is 40
// act
ViewportLimiter.LimitExtent(viewport, PanMode.KeepCenterWithinExtents, restrictTo, viewport.Extent);
// assert
Assert.AreEqual(viewport.Center.X, 20);
Assert.AreEqual(viewport.Center.Y, 40);
}
public void TestRestrictZoom()
{
// arrange
var viewport = new Viewport {
CenterX = 0, CenterY = 0, Width = 100, Height = 100, Resolution = 1
};
// viewport.Center is (0, 0) at this point
var limiter = new ViewportLimiter
{
PanLimits = new MRect(20, 40, 120, 140) // Minimal X value is 20, Minimal Y value is 40
};
// act
limiter.LimitExtent(viewport, viewport.Extent);
// assert
Assert.AreEqual(viewport.Center.X, 20);
Assert.AreEqual(viewport.Center.Y, 40);
}
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:
InvalidateCanvas();
_mode = TouchMode.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 = TouchMode.Zooming;
_innerRotation = _map.Viewport.Rotation;
}
else
{
_mode = TouchMode.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 = TouchMode.Zooming;
_innerRotation = _map.Viewport.Rotation;
}
else
{
_mode = TouchMode.Dragging;
_previousCenter = touchPoints.First();
}
break;
case MotionEventActions.Move:
switch (_mode)
{
case TouchMode.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);
InvalidateCanvas();
}
_previousCenter = touchPosition;
}
break;
case TouchMode.Zooming:
{
if (touchPoints.Count < 2)
{
return;
}
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;
}
break;
}
}
public override void TouchesMoved(NSSet touches, UIEvent evt)
{
base.TouchesMoved(touches, evt);
if (evt.AllTouches.Count == 1)
{
if (touches.AnyObject is UITouch touch)
{
var currentPos = touch.LocationInView(this);
var previousPos = touch.PreviousLocationInView(this);
_map.Viewport.Transform(currentPos.X, currentPos.Y, previousPos.X, previousPos.Y);
ViewportLimiter.LimitExtent(_map.Viewport, _map.PanMode, _map.PanLimits, _map.Envelope);
RefreshGraphics();
}
}
else if (evt.AllTouches.Count >= 2)
{
var prevLocations = evt.AllTouches.Select(t => ((UITouch)t).PreviousLocationInView(this))
.Select(p => new Point(p.X, p.Y)).ToList();
var locations = evt.AllTouches.Select(t => ((UITouch)t).LocationInView(this))
.Select(p => new Point(p.X, p.Y)).ToList();
var(prevCenter, prevRadius, prevAngle) = GetPinchValues(prevLocations);
var(center, radius, angle) = GetPinchValues(locations);
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);
ViewportLimiter.Limit(_map.Viewport,
_map.ZoomMode, _map.ZoomLimits, _map.Resolutions,
_map.PanMode, _map.PanLimits, _map.Envelope);
RefreshGraphics();
}
}
public void MapView_Touch(object sender, TouchEventArgs args)
{
var x = (int)args.Event.RawX;
var y = (int)args.Event.RawY;
switch (args.Event.Action)
{
case MotionEventActions.Down:
_previousMap = null;
_mode = Dragging;
break;
case MotionEventActions.Up:
_previousMap = null;
_canvas.Invalidate();
_mode = None;
_map.ViewChanged(true);
Map.InvokeInfo(GetScreenPosition(args.Event), _scale, _renderer.SymbolCache);
break;
case MotionEventActions.Pointer2Down:
_previousMap = null;
_oldDist = Spacing(args.Event);
MidPoint(_currentMid, args.Event);
_previousMid = _currentMid;
if (AllowPinchRotation)
{
_previousAngle = Angle(args.Event);
}
_mode = Zoom;
break;
case MotionEventActions.Pointer2Up:
_previousMap = null;
_previousMid = null;
_mode = Dragging;
break;
case MotionEventActions.Move:
switch (_mode)
{
case Dragging:
_currentMap = new PointF(x, y);
if (_previousMap != null)
{
_map.Viewport.Transform(
_currentMap.X / _scale,
_currentMap.Y / _scale,
_previousMap.X / _scale,
_previousMap.Y / _scale);
ViewportLimiter.LimitExtent(_map.Viewport,
_map.PanMode, _map.PanLimits, _map.Envelope);
_canvas.Invalidate();
}
_previousMap = _currentMap;
break;
case Zoom:
{
if (args.Event.PointerCount < 2)
{
return;
}
var newDist = Spacing(args.Event);
var scale = newDist / _oldDist;
_oldDist = Spacing(args.Event);
_previousMid = new PointF(_currentMid.X, _currentMid.Y);
MidPoint(_currentMid, args.Event);
_map.Viewport.Transform(
_currentMid.X / _scale,
_currentMid.Y / _scale,
_previousMid.X / _scale,
_previousMid.Y / _scale,
scale);
if (AllowPinchRotation)
{
var angle = Angle(args.Event);
_map.Viewport.Rotation += angle - _previousAngle;
_previousAngle = angle;
}
ViewportLimiter.Limit(_map.Viewport,
_map.ZoomMode, _map.ZoomLimits, _map.Resolutions,
_map.PanMode, _map.PanLimits, _map.Envelope);
_canvas.Invalidate();
}
break;
}
break;
}
}
public void MapView_Touch(object sender, TouchEventArgs args)
{
var x = (int)args.Event.GetX(0);
var y = (int)args.Event.GetY(0);
switch (args.Event.Action)
{
case MotionEventActions.Down:
_previousTouchPosition = null;
_touchDownPosition = new PointF(x, y);
_mode = Dragging;
break;
case MotionEventActions.Up:
_canvas.Invalidate();
_mode = None;
_map.ViewChanged(true);
var position = GetScreenPosition(args.Event);
Map.InvokeInfo(position, _touchDownPosition.ToMapsui(), _scale, _renderer.SymbolCache, WidgetTouch);
break;
case MotionEventActions.Pointer2Down:
_previousTouchPosition = null;
_oldDist = Spacing(args.Event);
_touchCenter = GetTouchCenter(args.Event);
_previousTouchCenter = _touchCenter;
if (AllowPinchRotation)
{
_previousAngle = Angle(args.Event);
}
_touchDownPosition = _touchCenter;
_mode = Zoom;
break;
case MotionEventActions.Pointer2Up:
_previousTouchPosition = null;
_previousTouchCenter = null;
_mode = Dragging;
break;
case MotionEventActions.Move:
switch (_mode)
{
case Dragging:
_touchPosition = new PointF(x, y);
if (_previousTouchPosition != null)
{
_map.Viewport.Transform(
_touchPosition.X / _scale,
_touchPosition.Y / _scale,
_previousTouchPosition.X / _scale,
_previousTouchPosition.Y / _scale);
ViewportLimiter.LimitExtent(_map.Viewport,
_map.PanMode, _map.PanLimits, _map.Envelope);
_canvas.Invalidate();
}
_previousTouchPosition = _touchPosition;
break;
case Zoom:
{
if (args.Event.PointerCount < 2)
{
return;
}
var newDist = Spacing(args.Event);
var scale = newDist / _oldDist;
_oldDist = Spacing(args.Event);
_previousTouchCenter = new PointF(_touchCenter.X, _touchCenter.Y);
_touchCenter = GetTouchCenter(args.Event);
_map.Viewport.Transform(
_touchCenter.X / _scale,
_touchCenter.Y / _scale,
_previousTouchCenter.X / _scale,
_previousTouchCenter.Y / _scale,
scale);
if (AllowPinchRotation)
{
var angle = Angle(args.Event);
_map.Viewport.Rotation += angle - _previousAngle;
_previousAngle = angle;
}
ViewportLimiter.Limit(_map.Viewport,
_map.ZoomMode, _map.ZoomLimits, _map.Resolutions,
_map.PanMode, _map.PanLimits, _map.Envelope);
_canvas.Invalidate();
}
break;
}
break;
}
}
public void MapView_Touch(object sender, TouchEventArgs args)
{
switch (args.Event.Action)
{
case MotionEventActions.Down:
_previousTouchPosition = null;
_touchDownPosition = GetScreenPosition(args.Event, this);
_mode = Dragging;
break;
case MotionEventActions.Up:
_canvas.Invalidate();
_mode = None;
_map.ViewChanged(true);
var position = GetScreenPosition(args.Event, this);
Map.InvokeInfo(position, _touchDownPosition, _scale, _renderer.SymbolCache, WidgetTouch);
break;
case MotionEventActions.Pointer2Down:
_previousTouchPosition = null;
_previousDistance = DistanceBetweenTouches(args.Event);
_touchCenter = GetTouchCenter(args.Event, this);
_previousTouchCenter = _touchCenter;
if (AllowPinchRotation)
{
_previousAngle = Angle(args.Event);
_innerRotation = _map.Viewport.Rotation;
}
_touchDownPosition = _touchCenter;
_mode = Zoom;
break;
case MotionEventActions.Pointer2Up:
_previousTouchPosition = null;
_previousTouchCenter = null;
_mode = Dragging;
break;
case MotionEventActions.Move:
switch (_mode)
{
case Dragging:
_touchPosition = GetScreenPosition(args.Event, this);
if (_previousTouchPosition != null)
{
_map.Viewport.Transform(
_touchPosition.X / _scale,
_touchPosition.Y / _scale,
_previousTouchPosition.X / _scale,
_previousTouchPosition.Y / _scale);
ViewportLimiter.LimitExtent(_map.Viewport,
_map.PanMode, _map.PanLimits, _map.Envelope);
_canvas.Invalidate();
}
_previousTouchPosition = _touchPosition;
break;
case Zoom:
{
if (args.Event.PointerCount < 2)
{
return;
}
var distance = DistanceBetweenTouches(args.Event);
var scale = distance / _previousDistance;
_previousDistance = distance;
_previousTouchCenter = _touchCenter;
_touchCenter = GetTouchCenter(args.Event, this);
_map.Viewport.Transform(
_touchCenter.X / _scale,
_touchCenter.Y / _scale,
_previousTouchCenter.X / _scale,
_previousTouchCenter.Y / _scale,
scale);
if (AllowPinchRotation)
{
var angle = Angle(args.Event);
_innerRotation += angle - _previousAngle;
_innerRotation %= 360;
if (_innerRotation > 180)
{
_innerRotation -= 360;
}
else if (_innerRotation < -180)
{
_innerRotation += 360;
}
if (_map.Viewport.Rotation == 0 && Math.Abs(_innerRotation) >= Math.Abs(UnSnapRotationDegrees))
{
_map.Viewport.Rotation = _innerRotation;
}
else if (_map.Viewport.Rotation != 0)
{
if (Math.Abs(_innerRotation) <= Math.Abs(ReSnapRotationDegrees))
{
_map.Viewport.Rotation = 0;
}
else
{
_map.Viewport.Rotation = _innerRotation;
}
}
_previousAngle = 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 (_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);
}
public void MapView_Touch(object sender, TouchEventArgs args)
{
try
{
if (_gestureDetector.OnTouchEvent(args.Event))
{
return;
}
}
catch (ObjectDisposedException e)
{
System.Diagnostics.Debug.WriteLine(e.Message);
_gestureDetector = new GestureDetector(Context, new GestureDetector.SimpleOnGestureListener());
_gestureDetector.SingleTapConfirmed += OnSingleTapped;
_gestureDetector.DoubleTap += OnDoubleTapped;
Invalidate();
}
var touchPoints = GetScreenPositions(args.Event, this);
switch (args.Event.Action)
{
case MotionEventActions.Up:
if (_mode == TouchMode.FeatureDrag)
{
StopFeatureDrag(args.Event);
}
RefreshGraphics();
_mode = TouchMode.None;
RefreshData();
break;
case MotionEventActions.Down:
case MotionEventActions.Pointer1Down:
case MotionEventActions.Pointer2Down:
case MotionEventActions.Pointer3Down:
if (_mode != TouchMode.FeatureDrag)
{
if (touchPoints.Count >= 2)
{
(_previousCenter, _previousRadius, _previousAngle) = GetPinchValues(touchPoints);
_mode = TouchMode.Zooming;
_innerRotation = Viewport.Rotation;
}
else
{
var mapInfoArgs = CheckStartDragHandled(args.Event);
if (mapInfoArgs.Handled)
{
System.Diagnostics.Debug.WriteLine("Drag consumed!!");
_draggedFeature = mapInfoArgs.MapInfo.Feature;
_mode = TouchMode.FeatureDrag;
}
else
{
_mode = TouchMode.Dragging;
_previousCenter = touchPoints.First();
}
}
}
break;
case MotionEventActions.Pointer1Up:
case MotionEventActions.Pointer2Up:
case MotionEventActions.Pointer3Up:
if (_mode != TouchMode.FeatureDrag)
{
// 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 = TouchMode.Zooming;
_innerRotation = Viewport.Rotation;
}
else
{
_mode = TouchMode.Dragging;
_previousCenter = touchPoints.First();
}
}
break;
case MotionEventActions.Move:
switch (_mode)
{
case TouchMode.FeatureDrag:
DragFeatureTo(args.Event);
break;
case TouchMode.Dragging:
{
if (touchPoints.Count != 1)
{
return;
}
var touchPosition = touchPoints.First();
if (_previousCenter != null && !_previousCenter.IsEmpty())
{
_viewport.Transform(touchPosition.X, touchPosition.Y, _previousCenter.X, _previousCenter.Y);
ViewportLimiter.LimitExtent(_viewport, _map.Limits.PanMode, _map.Limits.PanLimits, _map.Envelope);
RefreshGraphics();
}
_previousCenter = touchPosition;
}
break;
case TouchMode.Zooming:
{
if (touchPoints.Count < 2)
{
return;
}
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 (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.X, center.Y, prevCenter.X, prevCenter.Y, radius / prevRadius, rotationDelta);
(_previousCenter, _previousRadius, _previousAngle) = (center, radius, angle);
ViewportLimiter.Limit(_viewport,
_map.Limits.ZoomMode, _map.Limits.ZoomLimits, _map.Resolutions,
_map.Limits.PanMode, _map.Limits.PanLimits, _map.Envelope);
RefreshGraphics();
}
break;
}
break;
}
}