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Add IScrollAlgorithm.TimeAt()

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This commit is contained in:
smoogipoo
2018-11-09 19:55:48 +09:00
parent aee7a80e71
commit b9b20607af
7 changed files with 256 additions and 0 deletions
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28
osu.Game/Rulesets/UI/Scrolling/Algorithms/OverlappingScrollAlgorithm.cs
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@ -3,6 +3,7 @@
using osu.Framework.Lists;
using osu.Game.Rulesets.Timing;
using OpenTK;
namespace osu.Game.Rulesets.UI.Scrolling.Algorithms
{
@ -36,6 +37,33 @@ namespace osu.Game.Rulesets.UI.Scrolling.Algorithms
public float PositionAt(double time, double currentTime, double timeRange, float scrollLength)
=> (float)((time - currentTime) / timeRange * controlPointAt(time).Multiplier * scrollLength);
public double TimeAt(float position, double currentTime, double timeRange, float scrollLength)
{
// Find the control point relating to the position.
// Note: Due to velocity adjustments, overlapping control points will provide multiple valid time values for a single position
// As such, this operation provides unexpected results by using the latter of the control points.
int i = 0;
float pos = 0;
for (; i < controlPoints.Count; i++)
{
float lastPos = pos;
pos = PositionAt(controlPoints[i].StartTime, currentTime, timeRange, scrollLength);
if (pos > position)
{
i--;
pos = lastPos;
break;
}
}
i = MathHelper.Clamp(i, 0, controlPoints.Count - 1);
return controlPoints[i].StartTime + (position - pos) * timeRange / controlPoints[i].Multiplier / scrollLength;
}
public void Reset()
{
}