/// <summary>
/// Creates a new instance of <see cref="TangibleObject"/>.
/// </summary>
/// <param name="point1">The first point.</param>
/// <param name="point2">The second point.</param>
/// <param name="point3">The third point. This should be the direction point.</param>
internal TangibleObject(TouchPoint point1, TouchPoint point2, TouchPoint point3)
{
Check.NotNull(point1, "point1");
Check.NotNull(point2, "point2");
Check.NotNull(point3, "point3");
// Validate the points
if (point1.IsDirectionPoint || point2.IsDirectionPoint)
throw new InvalidOperationException("The first two points should not be direction points!");
if (!point3.IsDirectionPoint)
throw new InvalidOperationException("No direction point specified!");
Points = new TouchPointCollection();
Points.AddPoint(point1);
Points.AddPoint(point2);
Points.AddPoint(point3);
// Create the bottom line
_bottomLine = new TouchLine(point1, point2);
// Calculate the top line
_topLine = CalculateTopLine(_bottomLine, point3);
_topLine.Owner = this;
// Set the owner of the points.
//Points.ForEach(p => p.Owner = this);
foreach (var point in Points)
{
point.Owner = this;
point.Changed += OnPointChanged;
}
}
/// <summary>
/// Gets the min distance to a given point.
/// </summary>
/// <param name="points">The points.</param>
/// <param name="point">The point.</param>
/// <returns>a tuple with the first item - the point; and the second item - the distance.</returns>
public static Tuple<TouchPoint, double> MinDistanceTo(this IEnumerable<TouchPoint> points, TouchPoint point)
{
var result = points.Where(p => p != point)
.Select(x => new
{
Distance = MathHelper.Distance(point, x),
Point = x,
})
.MinBy(x => x.Distance);
return result != null
? new Tuple<TouchPoint, double>(result.Point, result.Distance)
: null;
}
/// <summary>
/// Creates a new instance of <see cref="TouchLine"/> by given two points.
/// </summary>
/// <param name="p1">The first point.</param>
/// <param name="p2">The second point.</param>
public TouchLine(TouchPoint p1, TouchPoint p2)
{
Point1 = p1;
Point2 = p2;
}
/// <summary>
/// Invoked when a dependent point has changed in order
/// to update the dependency.
/// </summary>
/// <param name="source">The source of the change.</param>
/// <param name="args">The event arguments.</param>
void OnDependentPointChanged(TouchPoint source, PointChangedEventArgs args)
{
Point oldPosition = this._position;
Point newPosition = new Point(oldPosition.X + args.DeltaX, oldPosition.Y + args.DeltaY);
//this.X = this.X + args.DeltaX;
//this.Y = this.Y + args.DeltaY;
this._position = newPosition;
OnPropertyChanged(() => X);
OnPropertyChanged(() => Y);
OnChanged(oldPosition, newPosition);
}
/// <summary>
/// Makes the current point dependent on a given touch point.
/// </summary>
/// <param name="touchPoint">The touch point.</param>
internal void DependsOn(TouchPoint touchPoint)
{
if (_dependentPoint != null)
{
_dependentPoint.Changed -= OnDependentPointChanged;
_dependentPoint = null;
}
if (touchPoint != null)
{
_dependentPoint = touchPoint;
_dependentPoint.Changed += OnDependentPointChanged;
}
}
/// <summary>
/// Creates a new instance of <see cref="TouchPoint"/> by given <see cref="PointerPoint"/>.
/// </summary>
/// <param name="point">The pointer point.</param>
/// <returns>new instance of <see cref="TouchPoint"/>.</returns>
public static TouchPoint Create(PointerPoint point)
{
TouchPoint touchPoint = new TouchPoint(point);
return touchPoint;
}
/// <summary>
/// Invoked when a point has changed.
/// </summary>
/// <param name="source">The source of the change.</param>
/// <param name="args">The event arguments.</param>
private void OnPointChanged(TouchPoint source, PointChangedEventArgs args)
{
// Manually update the disconnected point
var disconnectedPoint = DisconnectedPoint;
// Check whether the disconnectedPoint is not the source of the event, as the event will be raised when the point has just been disconnected.
// Furthermore, we need two touch points to update the third disconnected point.
if (disconnectedPoint != null && disconnectedPoint != source)
{
// We need to update one of the other two points that define the bottom line of the tangible object.
// One of the known touch points is the source.
// Now we need to find the other touch point that has contact.
var knownPoint = Points.Single(p => p != source && p != disconnectedPoint);
Windows.Foundation.Point reconstructedPoint;
Tuple<Windows.Foundation.Point, Windows.Foundation.Point> reconstructedPoints;
if (source.IsDirectionPoint)
{
// We know the direction point (source) and one of the points from the bottom line (knownPoint).
// As both points are symmetric we only need to consider one case.
reconstructedPoints = MathHelper.GetThirdPointOfTriangle(source, knownPoint, DistanceToDirectionPoint, BottomLineLength);
}
else
{
// We have one known point from the bottom line and the direction point.
if (disconnectedPoint.IsDirectionPoint)
{
// We know the points from the bottom line (source, knownPoint).
// We search for the direction point.
reconstructedPoints = MathHelper.GetThirdPointOfTriangle(source, knownPoint, DistanceToDirectionPoint, DistanceToDirectionPoint);
}
else
{
// We know one point from the bottom line (source) and the direction point (knownPoint)
reconstructedPoints = MathHelper.GetThirdPointOfTriangle(source, knownPoint, BottomLineLength, DistanceToDirectionPoint);
}
}
// As we have two solutions, we need the one that is closer to the previous value
// of the disconnected point.
reconstructedPoint = new List<Windows.Foundation.Point>()
{
reconstructedPoints.Item1, reconstructedPoints.Item2
}.MinDistanceTo(disconnectedPoint);
// Update the disconnected point.
// NOT WORKING !!!
// disconnectedPoint.UpdateDisconnectedPoint(reconstructedPoint.X, reconstructedPoint.Y);
}
// Update the top line.
var directionPoint = Points.Single(p => p.IsDirectionPoint);
var bottomLinePoints = Points.Where(p => !p.IsDirectionPoint).ToArray();
if (bottomLinePoints.Count() > 2)
throw new InvalidOperationException("The tangible object has unsufficient points.");
var topLine = CalculateTopLine(bottomLinePoints[0], bottomLinePoints[1], directionPoint);
_topLine.Update(topLine);
}
/// <summary>
/// Calculates the position of the top line.
/// </summary>
/// <param name="p1">The first point.</param>
/// <param name="p2">The second point.</param>
/// <param name="directionPoint">The direction point.</param>
/// <returns>the top line.</returns>
private Line2D CalculateTopLine(TouchPoint p1, TouchPoint p2, TouchPoint directionPoint)
{
Line2D topLine = MathHelper.GetParallelLine(p1, p2, directionPoint, TopLineOffset);
//TODO Make the top line a little bigger than the bottom line, because we have U-form.
return topLine;
}
/// <summary>
/// Calculates the position of the top line.
/// </summary>
/// <param name="bottomLine">The bottom line.</param>
/// <param name="directionPoint">The direction point.</param>
/// <returns>the top line.</returns>
private Line2D CalculateTopLine(TouchLine bottomLine, TouchPoint directionPoint)
{
return CalculateTopLine(bottomLine.Point1, bottomLine.Point2, directionPoint);
}
void OnTouchPointReleased(TouchPoint touchPoint)
{
_points.Remove(touchPoint);
if (!_userContactsInitialized)
{
ShowContacts();
_userContactsInitialized = true;
}
// Stop the timer when the point looses contact
// TryStopTimer(touchPoint);
}
/// <summary>
/// Updates the position of an TangibleObject
/// </summary>
/// <param name="touchPoint">The touch point.</param>
void OnTouchPointMoved(TouchPoint touchPoint)
{
if (touchPoint == null)
return;
if (touchPoint.BelongsToTangibleObject && touchPoint.IsInContact && touchPoint.IsDirectionPoint)
{
var tangibleObject = touchPoint.Owner;
var controller = GetController(tangibleObject);
// Update the position of the control
var tangibleObjectControl = controller.TangibleObjectControl;
tangibleObjectControl.SetPosition(touchPoint.Position.X, touchPoint.Position.Y);
tangibleObjectControl.SetRotation(MathHelper.GetTangibleRotation(touchPoint.Owner));
// Show the filter control when we are with the tangible object over a corner
// TryShowFilterControl(touchPoint, controller);
}
}
/// <summary>
/// Raises the <see cref="TouchPointReleased"/> event.
/// </summary>
/// <param name="point">The released point.</param>
protected virtual void OnTouchPointReleased(TouchPoint point)
{
var handler = TouchPointReleased;
handler?.Invoke(point);
}
