private double CalculateSpeed(double speed, double acceleration, double deceleration, double maxSpeed,
GestureKeys positiveKey, GestureKeys negativeKey)
{
if (IsAcceleratingInPositiveDirection(speed, positiveKey, negativeKey))
{
speed += acceleration;
}
else if (IsAcceleratingInNegativeDirection(speed, positiveKey, negativeKey))
{
speed -= acceleration;
}
else if (speed < 0)
{
speed += CalculateDeceleration(speed, deceleration);
}
else if (speed > 0)
{
speed -= CalculateDeceleration(speed, deceleration);
}
speed = Math.Min(maxSpeed, speed);
speed = Math.Max(-maxSpeed, speed);
return(speed);
}
private bool IsAcceleratingInNegativeDirection(double speed, GestureKeys positiveKey, GestureKeys negativeKey)
{
return(_isKeyDown[(int)negativeKey] &&
!_isKeyDown[(int)positiveKey] &&
speed <= 0);
}
