mirror of https://github.com/ppy/osu
38 lines
1.4 KiB
C#
38 lines
1.4 KiB
C#
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// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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using System.Collections.Generic;
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using osu.Framework.Utils;
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using osuTK.Graphics;
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namespace osu.Game.Utils
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{
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public static class ColourUtils
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{
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/// <summary>
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/// Samples from a given linear gradient at a certain specified point.
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/// </summary>
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/// <param name="gradient">The gradient, defining the colour stops and their positions (in [0-1] range) in the gradient.</param>
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/// <param name="point">The point to sample the colour at.</param>
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/// <returns>A <see cref="Color4"/> sampled from the linear gradient.</returns>
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public static Color4 SampleFromLinearGradient(IReadOnlyList<(float position, Color4 colour)> gradient, float point)
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{
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if (point < gradient[0].position)
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return gradient[0].colour;
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for (int i = 0; i < gradient.Count - 1; i++)
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{
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var startStop = gradient[i];
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var endStop = gradient[i + 1];
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if (point >= endStop.position)
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continue;
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return Interpolation.ValueAt(point, startStop.colour, endStop.colour, startStop.position, endStop.position);
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}
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return gradient[^1].colour;
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}
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}
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}
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