private void GenerateTranslationMatrix(SpriteTranslationKey key)
{
Single RadianAngle = DegreeToRadian(key.Angle);
//TODO: Verify that these formulas are correct.
Single x = key.X + (key.Scale * (FMath.Sin(RadianAngle) - FMath.Cos(RadianAngle)));
Single y = key.Y + (key.Scale * (FMath.Cos(RadianAngle) + FMath.Sin(RadianAngle)));
Single z = 0.0f;
Vector3 transV = new Vector3(x, y, z);
Matrix4 m = Matrix4.Translation(transV);
//Add to cache
TranslationMatrixCacheIndex.Enqueue(key);
TranslationMatrixCache.Add(key, m);
//Remove extra from cache
Int32 limit = GetTranslationMatrixCacheLimit();
while(TranslationMatrixCache.Count > limit)
{
SpriteTranslationKey old = TranslationMatrixCacheIndex.Dequeue();
TranslationMatrixCache.Remove(old);
}
}
public Matrix4 GetTranslationMatrix(Single x, Single y, Single scale, Single angle)
{
SpriteTranslationKey key = new SpriteTranslationKey(x, y, scale, angle);
if(!TranslationMatrixCache.ContainsKey(key))
GenerateTranslationMatrix(key);
return TranslationMatrixCache[key];
}