///<summary>Restores the light sources that were temporarily removed when UpdateBeforeOpacityChange was called.
/// (UpdateBeforeOpacityChange MUST be called immediately before changing the opacity.)</summary>
public void UpdateAfterOpacityChange()
{
if (!midOpacityUpdate)
{
throw new InvalidOperationException("This method can only be called to finish an opacity update");
}
midOpacityUpdate = false;
foreach (KeyValuePair <Point, int> pair in tempRemovedLights.GetAllKeyValuePairs())
{
UpdateBrightnessWithinRadius(pair.Key, pair.Value, 1);
}
tempRemovedLights.Clear();
}
///<summary>Temporarily removes light sources around the given cell so that that cell's opacity can be changed.
/// (Immediately after changing the opacity, UpdateAfterOpacityChange MUST be called.)</summary>
public void UpdateBeforeOpacityChange(Point cell)
{
if (midOpacityUpdate)
{
throw new InvalidOperationException("Already in the middle of an opacity update");
}
// (A pair of methods to update the opacity of multiple cells at once could also be useful here...)
midOpacityUpdate = true;
foreach (KeyValuePair <Point, int> pair in lightSources.GetAllKeyValuePairs())
{
int dist = cell.ChebyshevDistanceFrom(pair.Key);
if (pair.Value >= dist)
{
tempRemovedLights.Add(pair.Key, pair.Value);
UpdateBrightnessWithinRadius(pair.Key, pair.Value, -1);
}
}
}