//Used to update the length visualisation and displys the bounding circle (using length as the radius)
private void updateViews(TouchDevice callee)
{
// just want to know how WPF handles multi touches and events simulatenously(Observation: This states it is executed by Main: that means other threads just add the event to Main thread's queue :) )
//Console.WriteLine("Calling Thread: " + Thread.CurrentThread + " Is background Thread? : " + Thread.CurrentThread.IsBackground);
//update the booleans if there are no blobs/tags
if (noOfBlobs == 0)
{
blobDetected = false;
}
else
{
blobDetected = true;
}
if (noOfTags == 0)
{
tagDetected = false;
}
else
{
tagDetected = true;
}
Double distance = 0;
//Drag the length displayer closer to the calling canvas's point
lengthDisplayer.SetValue(Canvas.LeftProperty, (Double)callee.GetCenterPosition(this).X + 200);
lengthDisplayer.SetValue(Canvas.TopProperty, (Double)callee.GetCenterPosition(this).Y + 10);
//update length
if (blobDetected)
{
TouchDevice blob = blobTouchDevices.FirstOrDefault();
//Console.WriteLine( "Blob List SIze" + blobTouchDevices.Count + " TAG List Size : " + tagTouchDevices.Count);
if (noOfBlobs == 1 && noOfTags == 1)
{
distance = getDistance(blobTouchDevices[0].GetCenterPosition(this), tagTouchDevices[0].GetCenterPosition(this));
lengthDisplayer.Text = "Blob to Tag Distance: " + distance;
if (!blob.Equals(callee))
{
displayBoundingEllipse(distance, blob.GetCenterPosition(this));
}
}
else if (noOfBlobs == 2)
{
distance = getDistance(blobTouchDevices[0].GetCenterPosition(this), blobTouchDevices[1].GetCenterPosition(this));
lengthDisplayer.Text = "Blobs Distance: " + distance;
displayBoundingEllipse(distance, blobTouchDevices[0].GetCenterPosition(this));
}
}
else if (tagDetected)
{//no blobs detected
if (noOfTags == 2)
{
distance = getDistance(tagTouchDevices[0].GetCenterPosition(this), tagTouchDevices[1].GetCenterPosition(this));
lengthDisplayer.Text = "Tags Distance: " + distance;
TouchDevice bigTag;
//We are not interested in the moving part's tag. As we use the bigger tag for updating center of the bounding circle
if (tagTouchDevices[0] != callee)
{
bigTag = tagTouchDevices[0];
}
else
{
bigTag = tagTouchDevices[1];
}
displayBoundingEllipse(distance, bigTag.GetCenterPosition(this));
}
}
else
{
lengthDisplayer.Text = "Input not supported.\n OR \nToo few/many inputs. ";
}
}
