mirror of https://github.com/ppy/osu
32 lines
1.3 KiB
C#
32 lines
1.3 KiB
C#
// 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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namespace osu.Game.Rulesets.UI.Scrolling.Algorithms
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{
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public class ConstantScrollAlgorithm : IScrollAlgorithm
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{
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public double GetDisplayStartTime(double originTime, float offset, double timeRange, float scrollLength)
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{
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var adjustedTime = TimeAt(-offset, originTime, timeRange, scrollLength);
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return adjustedTime - timeRange;
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}
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public float GetLength(double startTime, double endTime, double timeRange, float scrollLength)
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{
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// At the hitobject's end time, the hitobject will be positioned such that its end rests at the origin.
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// This results in a negative-position value, and the absolute of it indicates the length of the hitobject.
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return -PositionAt(startTime, endTime, timeRange, scrollLength);
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}
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public float PositionAt(double time, double currentTime, double timeRange, float scrollLength)
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=> (float)((time - currentTime) / timeRange * scrollLength);
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public double TimeAt(float position, double currentTime, double timeRange, float scrollLength)
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=> position * timeRange / scrollLength + currentTime;
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public void Reset()
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{
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}
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}
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}
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