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Avoid rapid triangle repositioning during editor slider placement

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This commit is contained in:
Dean Herbert
2020-10-02 01:48:41 +09:00
parent e2934dff0e
commit dde7f706aa
3 changed files with 21 additions and 8 deletions
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21
osu.Game/Graphics/Backgrounds/Triangles.cs
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@ -86,13 +86,24 @@ namespace osu.Game.Graphics.Backgrounds
/// </summary>
public float Velocity = 1;
private readonly Random stableRandom;
private float nextRandom() => (float)(stableRandom?.NextDouble() ?? RNG.NextSingle());
private readonly SortedList<TriangleParticle> parts = new SortedList<TriangleParticle>(Comparer<TriangleParticle>.Default);
private IShader shader;
private readonly Texture texture;
public Triangles()
/// <summary>
/// Construct a new triangle visualisation.
/// </summary>
/// <param name="seed">An optional seed to stabilise random positions / attributes. Note that this does not guarantee stable playback when seeking in time.</param>
public Triangles(int? seed = null)
{
if (seed != null)
stableRandom = new Random(seed.Value);
texture = Texture.WhitePixel;
}
@ -175,8 +186,8 @@ namespace osu.Game.Graphics.Backgrounds
{
TriangleParticle particle = CreateTriangle();
particle.Position = new Vector2(RNG.NextSingle(), randomY ? RNG.NextSingle() : 1);
particle.ColourShade = RNG.NextSingle();
particle.Position = new Vector2(nextRandom(), randomY ? nextRandom() : 1);
particle.ColourShade = nextRandom();
particle.Colour = CreateTriangleShade(particle.ColourShade);
return particle;
@ -191,8 +202,8 @@ namespace osu.Game.Graphics.Backgrounds
const float std_dev = 0.16f;
const float mean = 0.5f;
float u1 = 1 - RNG.NextSingle(); //uniform(0,1] random floats
float u2 = 1 - RNG.NextSingle();
float u1 = 1 - nextRandom(); //uniform(0,1] random floats
float u2 = 1 - nextRandom();
float randStdNormal = (float)(Math.Sqrt(-2.0 * Math.Log(u1)) * Math.Sin(2.0 * Math.PI * u2)); // random normal(0,1)
var scale = Math.Max(triangleScale * (mean + std_dev * randStdNormal), 0.1f); // random normal(mean,stdDev^2)