mirror of https://github.com/ppy/osu
80 lines
2.4 KiB
C#
80 lines
2.4 KiB
C#
//Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
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//Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
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using System.Linq;
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using osu.Framework.Allocation;
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using osu.Framework.Extensions.IEnumerableExtensions;
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using osu.Framework.Graphics;
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using osu.Framework.Graphics.Containers;
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using osu.Framework.Graphics.Sprites;
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using osu.Framework.Graphics.Textures;
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using osu.Framework.MathUtils;
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using OpenTK;
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namespace osu.Game.Graphics.Backgrounds
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{
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public class Triangles : Container<Triangle>
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{
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public Triangles()
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{
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Alpha = 0.3f;
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}
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private float triangleScale = 1;
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public float TriangleScale
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{
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get { return triangleScale; }
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set
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{
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triangleScale = value;
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Children.ForEach(t => t.ScaleTo(triangleScale));
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}
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}
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private int aimTriangleCount => (int)((DrawWidth * DrawHeight) / 800 / triangleScale);
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protected override void Update()
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{
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base.Update();
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foreach (Drawable d in Children)
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{
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d.Position -= new Vector2(0, (float)(d.Scale.X * (50 / DrawHeight) * (Time.Elapsed / 880)) / triangleScale);
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if (d.DrawPosition.Y + d.DrawSize.Y * d.Scale.Y < 0)
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d.Expire();
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}
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bool useRandomX = Children.Count() < aimTriangleCount / 2;
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while (Children.Count() < aimTriangleCount)
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addTriangle(useRandomX);
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}
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protected virtual Triangle CreateTriangle()
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{
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var scale = triangleScale * RNG.NextSingle() * 0.4f + 0.2f;
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const float size = 100;
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return new Triangle
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{
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Origin = Anchor.TopCentre,
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RelativePositionAxes = Axes.Both,
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Scale = new Vector2(scale),
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// Scaling height by 0.866 results in equiangular triangles (== 60° and equal side length)
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Size = new Vector2(size, 0.866f * size),
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Alpha = RNG.NextSingle(),
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Depth = scale,
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};
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}
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private void addTriangle(bool randomX)
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{
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var sprite = CreateTriangle();
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sprite.Position = new Vector2(RNG.NextSingle(), randomX ? RNG.NextSingle() : 1);
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Add(sprite);
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}
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}
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}
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