/// <summary>
/// Process GestureEndMessage, Finish Gesture, reset temporary values
/// </summary>
/// <param name="gestureEventArgs"></param>
public void ProcessGestureEnd(GestureEventArgs gestureEventArgs)
{
if (_zoomingInProgress)
{
double val = (_currentZoomValue - _initialZoomValue);
double verhaeltnis = Math.Abs(val / _initialZoomValue);
if (_currentZoomValue > _initialZoomValue)
{
// zoom in must be greater 1
val = verhaeltnis + 1;
}
else
{
// zoom out must be lower 1
val = verhaeltnis;
}
try
{
//check range exceeded
if (val > maxvalue)
{
val = maxvalue;
}
if (val < minvalue)
{
val = minvalue;
}
//perform zoom operation
_manipulator.ZoomControl(val);
}
catch (Exception e)
{
Debug.Print(e.Message + ", " + e.StackTrace);
}
_zoomingInProgress = false;
}
if (_panningInProgress)
{
_panningInProgress = false;
}
}
/// <summary>
/// Performs the zooming operation on workitems or the taskboard pane.
/// </summary>
private void PerformZoomOperation()
{
// Only perform any actions if we have a two finger touch event.
if (_firstPoint.Key == null || _secondPoint.Key == null)
{
return;
}
// If we are not the currently working multitouch manager
// do not do anything.
if (_operator != this)
{
return;
}
double delta = 0;
bool hasChanged = false;
// If the first finger has been moved save it after delta calculation.
// and finger has moved
if ((_currentTouchId == (int)_firstPoint.Key) && (!_firstPoint.Value.Equals(_currentTouchPoint)))
{
AddPositionToQueue(_fingerTwoPositions, ((TouchPoint)_firstPoint.Value).Position.X);
//remember previous position of current finger
var prev = (TouchPoint)_firstPoint.Value;
//refresh current position
_firstPoint.Value = _currentTouchPoint;
if (!QueueMismatch(_fingerOnePositions))
{
//calculate delta for position change
delta = GetTouchPositionDelta(_secondPoint.Value as TouchPoint, prev, _firstPoint.Value as TouchPoint);
//add delta to delta queue
if (delta > 0)
{
AddPositionToQueue(_deltaQueue, delta);
}
//report change
hasChanged = true;
}
}
// if the second finger has been moved save it after delta calculation.
if ((_currentTouchId == (int)_secondPoint.Key) && (!_firstPoint.Value.Equals(_currentTouchPoint)))
{
AddPositionToQueue(_fingerTwoPositions, ((TouchPoint)_secondPoint.Value).Position.X);
//remember previous position of current finger
var prev = (TouchPoint)_secondPoint.Value;
//refresh current position
_secondPoint.Value = _currentTouchPoint;
if (!QueueMismatch(_fingerTwoPositions))
{
//calculate delta for position change
delta = GetTouchPositionDelta(_firstPoint.Value as TouchPoint, prev, _secondPoint.Value as TouchPoint);
if (delta > 0)
{
AddPositionToQueue(_deltaQueue, delta);
}
//report change
hasChanged = true;
}
}
// If we have a valid delta, use it to change the scale of the workitem.
if (hasChanged && delta > 0)
{
//supress errors by using average values from delta queue
delta = GetCumulativeDelta();
if (delta > 0)
{
_manipulator.ZoomControl(delta);
}
}
}