mirror of
https://github.com/ppy/osu.git
synced 2024-09-24 08:07:26 +08:00
75 lines
4.1 KiB
C#
75 lines
4.1 KiB
C#
// 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.
|
|
|
|
#nullable disable
|
|
|
|
namespace osu.Game.Rulesets.UI.Scrolling.Algorithms
|
|
{
|
|
public interface IScrollAlgorithm
|
|
{
|
|
/// <summary>
|
|
/// Given a point in time associated with an object's origin
|
|
/// and the spatial distance between the edge and the origin of the object along the scrolling axis,
|
|
/// computes the time at which the object initially enters the time range.
|
|
/// </summary>
|
|
/// <example>
|
|
/// Let's assume the following parameters:
|
|
/// <list type="bullet">
|
|
/// <item><paramref name="originTime"/> = 7000ms,</item>
|
|
/// <item><paramref name="offset"/> = 100px,</item>
|
|
/// <item><paramref name="timeRange"/> = 5000ms,</item>
|
|
/// <item><paramref name="scrollLength"/> = 1000px</item>
|
|
/// </list>
|
|
/// and a constant scrolling rate.
|
|
/// To arrive at the end of the scrolling container, the object's origin has to cover
|
|
/// <code>1000 + 100 = 1100px</code>
|
|
/// so that the edge starts at the end of the scrolling container.
|
|
/// One scroll length of 1000px covers 5000ms of time, so the time required to cover 1100px is equal to
|
|
/// <code>5000 * (1100 / 1000) = 5500ms,</code>
|
|
/// and therefore the object should start being visible at
|
|
/// <code>7000 - 5500 = 1500ms.</code>
|
|
/// </example>
|
|
/// <param name="originTime">The time point at which the object origin should enter the time range.</param>
|
|
/// <param name="offset">The spatial distance between the object's edge and its origin along the scrolling axis.</param>
|
|
/// <param name="timeRange">The amount of visible time.</param>
|
|
/// <param name="scrollLength">The absolute spatial length through <paramref name="timeRange"/>.</param>
|
|
/// <returns>The time at which the object should enter the time range.</returns>
|
|
double GetDisplayStartTime(double originTime, float offset, double timeRange, float scrollLength);
|
|
|
|
/// <summary>
|
|
/// Computes the spatial length within a start and end time.
|
|
/// </summary>
|
|
/// <param name="startTime">The start time.</param>
|
|
/// <param name="endTime">The end time.</param>
|
|
/// <param name="timeRange">The amount of visible time.</param>
|
|
/// <param name="scrollLength">The absolute spatial length through <paramref name="timeRange"/>.</param>
|
|
/// <returns>The absolute spatial length.</returns>
|
|
float GetLength(double startTime, double endTime, double timeRange, float scrollLength);
|
|
|
|
/// <summary>
|
|
/// Given the current time, computes the spatial position of a point in time.
|
|
/// </summary>
|
|
/// <param name="time">The time to compute the spatial position of.</param>
|
|
/// <param name="currentTime">The current time.</param>
|
|
/// <param name="timeRange">The amount of visible time.</param>
|
|
/// <param name="scrollLength">The absolute spatial length through <paramref name="timeRange"/>.</param>
|
|
/// <returns>The absolute spatial position.</returns>
|
|
float PositionAt(double time, double currentTime, double timeRange, float scrollLength);
|
|
|
|
/// <summary>
|
|
/// Computes the time which brings a point to a provided spatial position given the current time.
|
|
/// </summary>
|
|
/// <param name="position">The absolute spatial position.</param>
|
|
/// <param name="currentTime">The current time.</param>
|
|
/// <param name="timeRange">The amount of visible time.</param>
|
|
/// <param name="scrollLength">The absolute spatial length through <paramref name="timeRange"/>.</param>
|
|
/// <returns>The time at which <see cref="PositionAt(double,double,double,float)"/> == <paramref name="position"/>.</returns>
|
|
double TimeAt(float position, double currentTime, double timeRange, float scrollLength);
|
|
|
|
/// <summary>
|
|
/// Resets this <see cref="IScrollAlgorithm"/> to a default state.
|
|
/// </summary>
|
|
void Reset();
|
|
}
|
|
}
|