/// <summary>
/// Updates the position of the specified <see cref="TouchObject"/> to match that represented by the <see cref="GestureEvent"/> coordinates.
/// </summary>
/// <param name="touchObject">The <see cref="TouchObject"/> to rotate.</param>
/// <param name="gesture">The <see cref="GestureEvent"/> containing the new position data.</param>
private void HandleRotate(TouchObject touchObject, GestureEvent gesture)
{
//Since GestureWorks uses degrees, we have to convert to radians for XNA usage
float theta = MathHelper.ToRadians(gesture.Values["rotate_dtheta"]);
//Specify the rotation value of the GO
touchObject.Rotation += theta;
//Only update the position if there are two or more TouchPoints associated with the gesture
if (gesture.N > 1)
{
//Rotate the TouchObject around the center of the Gesture, not the object
touchObject.Position = RotateAboutCenter(touchObject.Position.X, touchObject.Position.Y, gesture.X, gesture.Y, theta);
}
}
/// <summary>
/// Returns a value indicating whether the specified TouchPoint lies within the specified TouchObject's bounding box.
/// </summary>
/// <param name="touchPoint">TouchPoint to test for TouchObject collision.</param>
/// <param name="touchObject">TouchObject to test for TouchPoint collision.</param>
/// <returns><c>true</c> if the TouchPoint is within the TouchObject's bounding box, otherwise <c>false</c></returns>
private bool Collision(TouchPoint touchPoint, TouchObject touchObject)
{
//Setup a bounding box for the touch point
Rectangle touchPointBox = new Rectangle((int)touchPoint.X - 10,
(int)touchPoint.Y - 10,
20,
20);
//Test to see if the touch point's bounding box intersects with the TouchObject
if (touchPointBox.Intersects(touchObject.BoundingBox))
return true;
else
return false;
}
