osu/osu.Game/Utils/GeometryUtils.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 System;
using System.Collections.Generic;
using System.Linq;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Primitives;
using osu.Game.Rulesets.Objects.Types;
using osuTK;
namespace osu.Game.Utils
{
public static class GeometryUtils
{
/// <summary>
/// Rotate a point around an arbitrary origin.
/// </summary>
/// <param name="point">The point.</param>
/// <param name="origin">The centre origin to rotate around.</param>
/// <param name="angle">The angle to rotate (in degrees).</param>
public static Vector2 RotatePointAroundOrigin(Vector2 point, Vector2 origin, float angle)
{
angle = -angle;
point.X -= origin.X;
point.Y -= origin.Y;
Vector2 ret;
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ret.X = point.X * MathF.Cos(float.DegreesToRadians(angle)) + point.Y * MathF.Sin(float.DegreesToRadians(angle));
ret.Y = point.X * -MathF.Sin(float.DegreesToRadians(angle)) + point.Y * MathF.Cos(float.DegreesToRadians(angle));
ret.X += origin.X;
ret.Y += origin.Y;
return ret;
}
/// <summary>
/// Given a flip direction, a surrounding quad for all selected objects, and a position,
/// will return the flipped position in screen space coordinates.
/// </summary>
public static Vector2 GetFlippedPosition(Direction direction, Quad quad, Vector2 position)
{
var centre = quad.Centre;
switch (direction)
{
case Direction.Horizontal:
position.X = centre.X - (position.X - centre.X);
break;
case Direction.Vertical:
position.Y = centre.Y - (position.Y - centre.Y);
break;
}
return position;
}
/// <summary>
/// Given a scale vector, a surrounding quad for all selected objects, and a position,
/// will return the scaled position in screen space coordinates.
/// </summary>
public static Vector2 GetScaledPosition(Anchor reference, Vector2 scale, Quad selectionQuad, Vector2 position)
{
// adjust the direction of scale depending on which side the user is dragging.
float xOffset = ((reference & Anchor.x0) > 0) ? -scale.X : 0;
float yOffset = ((reference & Anchor.y0) > 0) ? -scale.Y : 0;
// guard against no-ops and NaN.
if (scale.X != 0 && selectionQuad.Width > 0)
position.X = selectionQuad.TopLeft.X + xOffset + (position.X - selectionQuad.TopLeft.X) / selectionQuad.Width * (selectionQuad.Width + scale.X);
if (scale.Y != 0 && selectionQuad.Height > 0)
position.Y = selectionQuad.TopLeft.Y + yOffset + (position.Y - selectionQuad.TopLeft.Y) / selectionQuad.Height * (selectionQuad.Height + scale.Y);
return position;
}
/// <summary>
/// Returns a quad surrounding the provided points.
/// </summary>
/// <param name="points">The points to calculate a quad for.</param>
public static Quad GetSurroundingQuad(IEnumerable<Vector2> points)
{
if (!points.Any())
return new Quad();
Vector2 minPosition = new Vector2(float.MaxValue, float.MaxValue);
Vector2 maxPosition = new Vector2(float.MinValue, float.MinValue);
// Go through all hitobjects to make sure they would remain in the bounds of the editor after movement, before any movement is attempted
foreach (var p in points)
{
minPosition = Vector2.ComponentMin(minPosition, p);
maxPosition = Vector2.ComponentMax(maxPosition, p);
}
Vector2 size = maxPosition - minPosition;
return new Quad(minPosition.X, minPosition.Y, size.X, size.Y);
}
/// <summary>
/// Returns a gamefield-space quad surrounding the provided hit objects.
/// </summary>
/// <param name="hitObjects">The hit objects to calculate a quad for.</param>
public static Quad GetSurroundingQuad(IEnumerable<IHasPosition> hitObjects) =>
GetSurroundingQuad(hitObjects.SelectMany(h =>
{
if (h is IHasPath path)
{
return new[]
{
h.Position,
// can't use EndPosition for reverse slider cases.
h.Position + path.Path.PositionAt(1)
};
}
return new[] { h.Position };
}));
}
}