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using Microsoft.Xna.Framework;
namespace V3
{
/// <summary>
/// A class for telling when to do an update for events with a constant frequency.
/// </summary>
public sealed class UpdatesPerSecond
{
private double mTimeBetweenUpdates;
private double mTimeSinceLastUpdate;
/// <summary>
/// Initializes class.
/// </summary>
/// <param name="frequency">How many updates should be done per second.</param>
public UpdatesPerSecond(double frequency)
{
ChangeFrequency(frequency);
}
/// <summary>
/// Change update frequency.
/// </summary>
/// <param name="frequency">How many updates should be done per second.</param>
private void ChangeFrequency(double frequency)
{
mTimeBetweenUpdates = 1d / frequency;
}
/// <summary>
/// Tells if it is time to do an update.
/// </summary>
/// <param name="gameTime">Current game time.</param>
/// <returns></returns>
public bool IsItTime(GameTime gameTime)
{
mTimeSinceLastUpdate += gameTime.ElapsedGameTime.TotalSeconds;
if (mTimeSinceLastUpdate >= mTimeBetweenUpdates)
{
Reset();
return true;
}
return false;
}
/// <summary>
/// Reset internal timer for checking if update should be done.
/// </summary>
private void Reset()
{
mTimeSinceLastUpdate = 0;
}
}
}
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