private void resetGesture()
{
isReceivingUserTouchInput = false; //The user has to lift his finger and retouch again
didFireStartGestureAction = false;
currPos = Vector2.zero;
prevPos = Vector2.zero;
_gestureState = GESTURE_STATE.STATE_STATIC;
currentDirection = DIRECTION.NULL;
}
IEnumerator updateGesture()
{
for (; ;)
{
// If the user is not touching the screen, do nothing
if (!isReceivingUserTouchInput)
{
yield return(new WaitForSeconds(maxDelay));
continue;
}
// Calculate the current touch position in screen space
Vector2 inputPos = new Vector2();
Vector2 screenPos = new Vector2();
Vector2 centerPos = new Vector2();
inputPos.x = Input.mousePosition.x;
inputPos.y = Camera.main.pixelHeight - Input.mousePosition.y;
screenPos = Camera.main.ScreenToWorldPoint(new Vector3(inputPos.x, inputPos.y, Camera.main.nearClipPlane));
// Debug.Log ("screen pos: " + screenPos);
// We need the previous screen touch position and the current one
prevPos = currPos;
currPos = screenPos;
// Get the vectors from the center of the screen
var v1 = currPos - centerPos;
var v2 = prevPos - centerPos;
// Debug.Log ("v1: [" + v1 + "] && v2: [" + v2 + "]");
// Calculate sign (Cross product) and the dot product
var sign = 0.0f;
var dot = 0.0f;
// If this was the first run, prevPos would be zero and it would give incorrect calculations,
// just set the direction to CW and the dot to greater than one just to pass the first run
// Debug.Log("prevPos: " + prevPos);
// Debug.Log("currPos: " + currPos);
if (prevPos == Vector2.zero)
{
sign = -1;
dot = 1;
}
else
{
sign = Mathf.Sign(v1.x * v2.y - v1.y * v2.x);
dot = Vector2.Dot(v1, v2);
}
// Debug.Log("dot product: " + dot + " | sign: " + sign);
//Assign direction
switch (currentDirection)
{
case DIRECTION.NULL:
break;
case DIRECTION.CW:
// If this was still CW, the user is still gesturing in the correct direction.
// Else, the user must've broken the gesture
if (sign > 0)
{
Debug.Log("Breaking gesture 1");
breakGesture();
yield return(new WaitForSeconds(maxDelay));
continue;
}
break;
case DIRECTION.CCW:
// If this was still CCW, the user is still gesturing in the correct direction.
// Else, the user must've broken the gesture
if (sign < 0)
{
Debug.Log("Breaking gesture 2");
breakGesture();
yield return(new WaitForSeconds(maxDelay));
continue;
}
break;
}
// So far, the gesture is still moving in a proper direction, check the dot product for a break in gesture
if (dot < 0.0f || dot > this.gestureRadius)
{
Debug.Log("Breaking gesture 3");
breakGesture();
yield return(new WaitForSeconds(maxDelay));
continue;
}
// If we reached here, its confirmed that we are moving with no breaks
currentDirection = sign < 0 ? DIRECTION.CW : DIRECTION.CCW;
_gestureState = GESTURE_STATE.STATE_MOVING;
if (!didFireStartGestureAction)
{
startGesture();
}
// Debug.Log("currentDirection: [" + currentDirection.ToString() + "] && gestureState: [" + gestureState.ToString() + "]");
yield return(new WaitForSeconds(maxDelay));
}
}