osu/osu.Game.Rulesets.Catch/UI/HitExplosion.cs

// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.

using osu.Framework.Extensions.Color4Extensions;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Effects;
using osu.Framework.Utils;
using osu.Game.Rulesets.Catch.Objects.Drawables;
using osuTK;
using osuTK.Graphics;

namespace osu.Game.Rulesets.Catch.UI
{
    public class HitExplosion : CompositeDrawable
    {
        private readonly CircularContainer largeFaint;

        public HitExplosion(DrawableCatchHitObject fruit)
        {
            Size = new Vector2(20);
            Anchor = Anchor.TopCentre;
            Origin = Anchor.BottomCentre;

            Color4 objectColour = fruit.AccentColour.Value;

            // scale roughly in-line with visual appearance of notes

            const float angle_variangle = 15; // should be less than 45

            const float roundness = 100;

            const float initial_height = 10;

            var colour = Interpolation.ValueAt(0.4f, objectColour, Color4.White, 0, 1);

            InternalChildren = new Drawable[]
            {
                largeFaint = new CircularContainer
                {
                    Anchor = Anchor.Centre,
                    Origin = Anchor.Centre,
                    RelativeSizeAxes = Axes.Both,
                    Masking = true,
                    // we want our size to be very small so the glow dominates it.
                    Size = new Vector2(0.8f),
                    Blending = BlendingParameters.Additive,
                    EdgeEffect = new EdgeEffectParameters
                    {
                        Type = EdgeEffectType.Glow,
                        Colour = Interpolation.ValueAt(0.1f, objectColour, Color4.White, 0, 1).Opacity(0.3f),
                        Roundness = 160,
                        Radius = 200,
                    },
                },
                new CircularContainer
                {
                    Anchor = Anchor.Centre,
                    Origin = Anchor.Centre,
                    RelativeSizeAxes = Axes.Both,
                    Masking = true,
                    Blending = BlendingParameters.Additive,
                    EdgeEffect = new EdgeEffectParameters
                    {
                        Type = EdgeEffectType.Glow,
                        Colour = Interpolation.ValueAt(0.6f, objectColour, Color4.White, 0, 1),
                        Roundness = 20,
                        Radius = 50,
                    },
                },
                new CircularContainer
                {
                    Anchor = Anchor.Centre,
                    Origin = Anchor.Centre,
                    RelativeSizeAxes = Axes.Both,
                    Masking = true,
                    Size = new Vector2(0.01f, initial_height),
                    Blending = BlendingParameters.Additive,
                    Rotation = RNG.NextSingle(-angle_variangle, angle_variangle),
                    EdgeEffect = new EdgeEffectParameters
                    {
                        Type = EdgeEffectType.Glow,
                        Colour = colour,
                        Roundness = roundness,
                        Radius = 40,
                    },
                },
                new CircularContainer
                {
                    Anchor = Anchor.Centre,
                    Origin = Anchor.Centre,
                    RelativeSizeAxes = Axes.Both,
                    Masking = true,
                    Size = new Vector2(0.01f, initial_height),
                    Blending = BlendingParameters.Additive,
                    Rotation = RNG.NextSingle(-angle_variangle, angle_variangle),
                    EdgeEffect = new EdgeEffectParameters
                    {
                        Type = EdgeEffectType.Glow,
                        Colour = colour,
                        Roundness = roundness,
                        Radius = 40,
                    },
                }
            };
        }

        protected override void LoadComplete()
        {
            base.LoadComplete();

            const double duration = 400;

            largeFaint
                .ResizeTo(largeFaint.Size * new Vector2(5, 1), duration, Easing.OutQuint)
                .FadeOut(duration * 2);

            this.FadeInFromZero(50).Then().FadeOut(duration, Easing.Out);
            Expire(true);
        }
    }
}