public virtual void Update(double total_seconds_elapsed, CollisionGrid grid)
{
if (total_seconds_elapsed == 0.0)
return;
Vector2 new_velocity = _velocity;
new_velocity += (_accelleration * (float)total_seconds_elapsed);
new_velocity.Y += _gravitationalAccelleration * (float)total_seconds_elapsed;
new_velocity = Vector2.Clamp(new_velocity, Vector2.Negate(_maxVelocity), _maxVelocity);
Vector2 distance_to_travel = (new_velocity * (float)total_seconds_elapsed) + _positionCarryOver;
Vector2 distance_traveled = grid.CheckCollision(BoundingBox, distance_to_travel, _fallThrough);
//Check to see if we moved as expected, if not we hit a block, so set the new velocity to 0.
if (distance_traveled.X != distance_to_travel.X)
new_velocity.X = 0;
if (distance_traveled.Y != distance_to_travel.Y)
{
new_velocity.Y = 0;
}
Velocity = new_velocity;
int original_y_position = _boundingBox.Y;
AddToPositionAndCarry(distance_traveled);
//If we were stopped from traveling downward, set the isAirborn flag to false
if (distance_to_travel.Y > distance_traveled.Y)
{
_isAirborn = false;
}
//Otherwise if we moved in the Y direction, set us as airborn
else if (original_y_position != _boundingBox.Y)
{
_isAirborn = true;
}
}
