///<summary>Converts the angle of a swipe on the screen into a direction for the snake (`Snake.DIRECTION_*`).
/// If a direction cannot be determined, returns -1.</summary>
public int directionForSwipe(float swipeAngle)
{
// use the onscreen angles from the center of the direction cube to the corners as boundaries for the directions
Vector2 centerScreenPoint = this.smallCamera.WorldToScreenPoint(this.center.position); // (implicit conversion from Vector3)
Vector2 posXposZScreenPoint = this.smallCamera.WorldToScreenPoint(this.posXposZ.position);
Vector2 negXposZScreenPoint = this.smallCamera.WorldToScreenPoint(this.negXposZ.position);
Vector2 negXnegZScreenPoint = this.smallCamera.WorldToScreenPoint(this.negXnegZ.position);
Vector2 posXnegZScreenPoint = this.smallCamera.WorldToScreenPoint(this.posXnegZ.position);
float posXposZAngle = Swipes.angleBetweenPoints(centerScreenPoint, posXposZScreenPoint);
float negXposZAngle = Swipes.angleBetweenPoints(centerScreenPoint, negXposZScreenPoint);
float negXnegZAngle = Swipes.angleBetweenPoints(centerScreenPoint, negXnegZScreenPoint);
float posXnegZAngle = Swipes.angleBetweenPoints(centerScreenPoint, posXnegZScreenPoint);
//Debug.Log("+x+z: " + posXposZAngle + ", -x+z: " + negXposZAngle + ", -x-z: " + negXnegZAngle + ", +x-z: " + posXnegZAngle);
if (this.angleIsInRange(swipeAngle, posXposZAngle, negXposZAngle))
{
return(Snake.DIRECTION_POS_Z);
}
else if (this.angleIsInRange(swipeAngle, negXposZAngle, negXnegZAngle))
{
return(Snake.DIRECTION_NEG_X);
}
else if (this.angleIsInRange(swipeAngle, negXnegZAngle, posXnegZAngle))
{
return(Snake.DIRECTION_NEG_Z);
}
else if (this.angleIsInRange(swipeAngle, posXnegZAngle, posXposZAngle))
{
return(Snake.DIRECTION_POS_X);
}
return(-1);
}
