/// <summary>Updates the currently displayed background</summary>
/// <param name="TimeElapsed">The time elapsed since the previous call to this function</param>
/// <param name="GamePaused">Whether the game is currently paused</param>
public void UpdateBackground(double TimeElapsed, bool GamePaused)
{
if (GamePaused)
{
//Don't update the transition whilst paused
TimeElapsed = 0.0;
}
const float scale = 0.5f;
// fog
const float fogDistance = 600.0f;
if (CurrentFog.Start < CurrentFog.End & CurrentFog.Start < fogDistance)
{
float ratio = (float)CurrentBackground.BackgroundImageDistance / fogDistance;
renderer.OptionFog = true;
renderer.Fog.Start = CurrentFog.Start * ratio * scale;
renderer.Fog.End = CurrentFog.End * ratio * scale;
renderer.Fog.Color = CurrentFog.Color;
renderer.SetFogForImmediateMode();
}
else
{
renderer.OptionFog = false;
}
//Update the currently displayed background
CurrentBackground.UpdateBackground(SecondsSinceMidnight, TimeElapsed, false);
if (TargetBackground == null || TargetBackground == CurrentBackground)
{
//No target background, so call the render function
renderer.Background.Render(CurrentBackground, scale);
return;
}
//Update the target background
if (TargetBackground is StaticBackground)
{
TargetBackground.Countdown += TimeElapsed;
}
TargetBackground.UpdateBackground(SecondsSinceMidnight, TimeElapsed, true);
switch (TargetBackground.Mode)
{
//Render, switching on the transition mode
case BackgroundTransitionMode.FadeIn:
renderer.Background.Render(CurrentBackground, 1.0f, scale);
renderer.Background.Render(TargetBackground, TargetBackground.CurrentAlpha, scale);
break;
case BackgroundTransitionMode.FadeOut:
renderer.Background.Render(TargetBackground, 1.0f, scale);
renderer.Background.Render(CurrentBackground, TargetBackground.CurrentAlpha, scale);
break;
}
//If our target alpha is greater than or equal to 1.0f, the background is fully displayed
if (TargetBackground.CurrentAlpha >= 1.0f)
{
//Set the current background to the target & reset target to null
CurrentBackground = TargetBackground;
TargetBackground = null;
}
}
