public FlickDirections DetectFlickDirection(StrokeInfo strokeInfo)
{
//Find the first points as A(X1, Y1) and last points as B(X2, Y2) in the current stroke
StylusPoint pointA = strokeInfo.CurrentStroke.StylusPoints[0];
StylusPoint pointB = strokeInfo.CurrentStroke.StylusPoints[strokeInfo.CurrentStroke.StylusPoints.Count - 1];
double pointAx = pointA.X;
double pointAy = pointA.Y;
double pointBx = pointB.X;
double pointBy = pointB.Y;
double deltaX = Math.Abs(pointAx - pointBx);
double deltaY = Math.Abs(pointAy - pointBy);
double radians = Math.Atan2(deltaY, deltaX);
double angle = radians * (180 / Math.PI);
if (pointBy < pointAy)
{
//up direction
if (pointBx < pointAx && angle < 60)
{
strokeInfo.StrokeFlickDirection = FlickDirections.UpLeft;
return FlickDirections.UpLeft;
}
else if (pointBx > pointAx && angle < 60)
{
strokeInfo.StrokeFlickDirection = FlickDirections.UpRight;
return FlickDirections.UpRight;
}
else
{
strokeInfo.StrokeFlickDirection = FlickDirections.Up;
return FlickDirections.Up;
}
}
else
{
//down direction
if (pointBx < pointAx && angle < 60)
{
strokeInfo.StrokeFlickDirection = FlickDirections.DownLeft;
return FlickDirections.DownLeft;
}
else if (pointBx > pointAx && angle < 60)
{
strokeInfo.StrokeFlickDirection = FlickDirections.DownRight;
return FlickDirections.DownRight;
}
else
{
strokeInfo.StrokeFlickDirection = FlickDirections.Down;
return FlickDirections.Down;
}
}
}
public bool IsFlick(StrokeInfo strokeInfo)
{
//Feature 1: speed > SpeedRatio
//Feature 2: first 5 points pressure average > last 5 points pressure average
//Feature 3: distance between first point and last point < distanceRatio
//Feature 4: TimeSpan total milliseconds < 400
if (strokeInfo.Span.TotalMilliseconds < TimeThreshold)
{
//if (strokeInfo.Speed > SpeedMin)
//{
if (strokeInfo.StrokeLength < DistanceMax && DistanceMin < strokeInfo.StrokeLength)
{
if (strokeInfo.PressureRatio > PressureRatioThreshold)
{
strokeInfo.IsFlickGesture = true;
return true;
}
}
//}
}
strokeInfo.IsFlickGesture = false;
return false;
}
public void circuitInkCanvas_StrokeCollected(object sender, InkCanvasStrokeCollectedEventArgs e)
{
CurrentStroke = e.Stroke;
if (!circuitInkCanvas.Strokes.Contains(e.Stroke))
{
circuitInkCanvas.Strokes.Add(e.Stroke);
}
#region Flick Detection
//Flick Gesture
TimeSpan timespan = DateTime.Now - _stylusDownTime;
StrokeInfo stroke = new StrokeInfo(CurrentStroke, timespan);
//Real Analysis
if (StrokeAnalyzer.Instance.IsFlick(stroke) && 1 == 0)
{
FlickDirections direction = StrokeAnalyzer.Instance.DetectFlickDirection(stroke);
StylusPoint PointA = stroke.StartPoint;
StylusPoint PointB = stroke.EndPoint;
AnimateArrowInFlickDirection(PointA.X, PointA.Y, PointB.X, PointB.Y);
//Throw one gate xaml on the canvas
Gate newGate = null;
switch (direction)
{
case FlickDirections.UpLeft:
newGate = new UserOutput();
break;
case FlickDirections.DownLeft:
newGate = new Xor();
//OR
break;
case FlickDirections.Down:
newGate = new And();
//AND
break;
case FlickDirections.DownRight:
//NOT
newGate = new Not();
break;
case FlickDirections.Up:
//INPUT
newGate = new Or();
break;
case FlickDirections.UpRight:
//OUTPUT
newGate = new UserInput();
break;
}
//GateLocation location = new GateLocation();
//Heuristic
//BO KANG??
Point temp = new Point(PointA.X - 30, PointA.Y - 30);
this.AddGate(newGate, new GateLocation(this.GetNearestSnapTo(this.TranslateScrolledPoint(temp))));
//this.AddGate(newGate, location);
this.circuitInkCanvas.UpdateLayout();
this.circuitInkCanvas.Strokes.Remove(CurrentStroke);
}
#endregion
/* check for drag Gate Stroke*/
if (onGateStroke)
{
circuitInkCanvas.Strokes.Remove(e.Stroke);
return;
}
/*check for draw wire stroke*/
if(onWireStroke)
{
circuitInkCanvas.Strokes.Remove(e.Stroke);
onWireStroke = false;
return;
}else
{
if(onWireMoveStroke)
{
circuitInkCanvas.Strokes.Remove(e.Stroke);
onWireMoveStroke = false;
return;
}
}
//Debug.WriteLine("Stroke Bound Percentage is " + stroke.BoundPercentage);
/* Test if the current stroke is wire connect stroke */
if (stroke.BoundPercentage > 10)
{
return;
}
//Debug.WriteLine("Stroke BoundPercentage is " + stroke.BoundPercentage.ToString());
/* check for scribble delete */
if (ScribbleDelete(e.Stroke)) return;
}