/// <summary>
/// Re-randomizes the stars drawn in the far area
/// </summary>
void RefreshBackground(int numStars)
{
if (numStars > Stars.Length / 4)
{
int PreviousStarNumber = Stars.Length / 4;
Array.Resize <VertexPositionColorTexture>(ref Stars, numStars * 4);
Array.Resize <int>(ref StarIndex, numStars * 6);
for (int i = PreviousStarNumber; i < numStars; i++)
{
Vector3 position = Manager.GetRandomNormal()
* (0.6f + 0.4f * (float)MyGame.random.NextDouble());
Vector2 texture = new Vector2(0.1f * MyGame.random.Next(10), 0.1f * MyGame.random.Next(10));
Stars[i * 4] = new VertexPositionColorTexture(
position
, Manager.GetRandomColor(true)
, texture);
Stars[i * 4 + 1] = new VertexPositionColorTexture(
position
, Manager.GetRandomColor(true)
, texture + Vector2.UnitX * 0.099f);
Stars[i * 4 + 2] = new VertexPositionColorTexture(
position
, Manager.GetRandomColor(true)
, texture + Vector2.UnitY * 0.099f);
Stars[i * 4 + 3] = new VertexPositionColorTexture(
position
, Manager.GetRandomColor(true)
, texture + Vector2.One * 0.099f);
StarIndex[i * 6] = i * 4;
StarIndex[i * 6 + 1] = i * 4 + 1;
StarIndex[i * 6 + 2] = i * 4 + 3;
StarIndex[i * 6 + 3] = i * 4;
StarIndex[i * 6 + 4] = i * 4 + 3;
StarIndex[i * 6 + 5] = i * 4 + 2;
}
}
else if (numStars < Stars.Length / 4)
{
Array.Resize <int>(ref StarIndex, numStars * 6);
//Randomize the order of stars a bit
int numChanges = Stars.Length / 4 - numStars;
for (int i = 0; i < numChanges; i++)
{
int OtherIndex = MyGame.random.Next(Stars.Length / 4);
VertexPositionColorTexture temp;
for (int j = 0; j < 4; j++)
{
temp = Stars[i * 4 + j];
Stars[i * 4 + j] = Stars[OtherIndex * 4 + j];
Stars[OtherIndex * 4 + j] = temp;
}
}
Array.Resize <VertexPositionColorTexture>(ref Stars, numStars * 4);
}
}