osu/osu.Game/Storyboards/StoryboardExtensions.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.
using osu.Framework.Extensions.EnumExtensions;
using osu.Framework.Graphics;
using osuTK;
namespace osu.Game.Storyboards
{
public static class StoryboardExtensions
{
/// <summary>
/// Given an origin and a set of properties, adjust the origin to display the sprite/animation correctly.
/// </summary>
/// <param name="origin">The current origin.</param>
/// <param name="vectorScale">The vector scale.</param>
/// <param name="flipH">Whether the element is flipped horizontally.</param>
/// <param name="flipV">Whether the element is flipped vertically.</param>
/// <returns>The adjusted origin.</returns>
public static Anchor AdjustOrigin(Anchor origin, Vector2 vectorScale, bool flipH, bool flipV)
{
// Either flip horizontally or negative X scale, but not both.
if (flipH ^ (vectorScale.X < 0))
{
if (origin.HasFlagFast(Anchor.x0))
origin = Anchor.x2 | (origin & (Anchor.y0 | Anchor.y1 | Anchor.y2));
else if (origin.HasFlagFast(Anchor.x2))
origin = Anchor.x0 | (origin & (Anchor.y0 | Anchor.y1 | Anchor.y2));
}
// Either flip vertically or negative Y scale, but not both.
if (flipV ^ (vectorScale.Y < 0))
{
if (origin.HasFlagFast(Anchor.y0))
origin = Anchor.y2 | (origin & (Anchor.x0 | Anchor.x1 | Anchor.x2));
else if (origin.HasFlagFast(Anchor.y2))
origin = Anchor.y0 | (origin & (Anchor.x0 | Anchor.x1 | Anchor.x2));
}
return origin;
}
}
}