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osu-lazer/osu.Game/Screens/Play/HUD/FailingLayer.cs

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// 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.
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#nullable disable
using System;
using osu.Framework.Allocation;
using osu.Framework.Bindables;
using osu.Framework.Extensions.Color4Extensions;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Colour;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Shapes;
using osu.Framework.Utils;
using osu.Game.Configuration;
using osu.Game.Graphics;
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using osu.Game.Rulesets.Scoring;
using osuTK.Graphics;
namespace osu.Game.Screens.Play.HUD
{
/// <summary>
/// An overlay layer on top of the playfield which fades to red when the current player health falls below a certain threshold defined by <see cref="low_health_threshold"/>.
/// </summary>
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public partial class FailingLayer : HealthDisplay
{
/// <summary>
/// Whether the current player health should be shown on screen.
/// </summary>
public readonly Bindable<bool> ShowHealth = new Bindable<bool>();
protected override bool PlayInitialIncreaseAnimation => false;
private const float max_alpha = 0.4f;
private const int fade_time = 400;
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private const float gradient_size = 0.2f;
/// <summary>
/// The threshold under which the current player life should be considered low and the layer should start fading in.
/// </summary>
private const double low_health_threshold = 0.20f;
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private readonly Container boxes;
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private Bindable<bool> fadePlayfieldWhenHealthLow;
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public FailingLayer()
{
RelativeSizeAxes = Axes.Both;
InternalChildren = new Drawable[]
{
boxes = new Container
{
Alpha = 0,
Blending = BlendingParameters.Additive,
RelativeSizeAxes = Axes.Both,
Children = new Drawable[]
{
new Box
{
RelativeSizeAxes = Axes.Both,
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Colour = ColourInfo.GradientHorizontal(Color4.White, Color4.White.Opacity(0)),
Width = gradient_size,
},
new Box
{
RelativeSizeAxes = Axes.Both,
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Width = gradient_size,
Colour = ColourInfo.GradientHorizontal(Color4.White.Opacity(0), Color4.White),
Anchor = Anchor.TopRight,
Origin = Anchor.TopRight,
},
}
},
};
}
[BackgroundDependencyLoader]
private void load(OsuColour color, OsuConfigManager config)
{
boxes.Colour = color.Red;
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fadePlayfieldWhenHealthLow = config.GetBindable<bool>(OsuSetting.FadePlayfieldWhenHealthLow);
fadePlayfieldWhenHealthLow.BindValueChanged(_ => updateState());
ShowHealth.BindValueChanged(_ => updateState());
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}
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protected override void LoadComplete()
{
base.LoadComplete();
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updateState();
}
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private void updateState()
{
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// Don't display ever if the ruleset is not using a draining health display.
bool showLayer = HealthProcessor is DrainingHealthProcessor && fadePlayfieldWhenHealthLow.Value && ShowHealth.Value;
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this.FadeTo(showLayer ? 1 : 0, fade_time, Easing.OutQuint);
}
protected override void Update()
{
base.Update();
double target = Math.Clamp(max_alpha * (1 - Current.Value / low_health_threshold), 0, max_alpha);
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boxes.Alpha = (float)Interpolation.Lerp(boxes.Alpha, target, Clock.ElapsedFrameTime * 0.01f);
}
}
}