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Code Issues Releases Wiki Activity

Improved KeepUprightAndUnscaled

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HiddenNode 2022-08-09 13:06:11 +01:00
parent cfd07cb366
commit 2367dc9610
1 changed files with 17 additions and 19 deletions
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36
osu.Game/Extensions/DrawableExtensions.cs
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@ -82,40 +82,38 @@ namespace osu.Game.Extensions
} }
/// <summary> /// <summary>
/// Keeps the drawable upright and prevents it from being scaled or flipped with its Parent. /// Keeps the drawable upright and unstretched preventing it from being rotated, sheared, scaled or flipped with its Parent.
/// </summary> /// </summary>
/// <param name="drawable">The drawable.</param> /// <param name="drawable">The drawable.</param>
public static void KeepUprightAndUnscaled(this Drawable drawable) public static void KeepUprightAndUnscaled(this Drawable drawable)
{ {
// Decomposes the inverse of the parent FrawInfo.Matrix into rotation, shear and scale.
var parentMatrix = drawable.Parent.DrawInfo.Matrix; var parentMatrix = drawable.Parent.DrawInfo.Matrix;
float angle = MathF.Atan(parentMatrix.M12 / parentMatrix.M11);
angle = MathHelper.RadiansToDegrees(angle);
parentMatrix.Transpose(); parentMatrix.Transpose();
// Remove Translation.
parentMatrix.M13 = 0.0f; parentMatrix.M13 = 0.0f;
parentMatrix.M23 = 0.0f; parentMatrix.M23 = 0.0f;
if ((Math.Abs(Math.Abs(angle) - 90.0)) < 2.0f)
{
Matrix3 m = Matrix3.CreateRotationZ(MathHelper.DegreesToRadians(40.0f));
m.Transpose();
parentMatrix *= m;
drawable.Rotation = 40.0f;
}
else
drawable.Rotation = 0.0f;
Matrix3 C = parentMatrix.Inverted(); Matrix3 C = parentMatrix.Inverted();
float alpha, beta, sx, sy; // Extract the rotation.
float angle = MathF.Atan2(C.M21, C.M11);
drawable.Rotation = MathHelper.RadiansToDegrees(angle);
// Remove rotation from the C matrix so that it only contains shear and scale.
Matrix3 m = Matrix3.CreateRotationZ(-angle);
m.Transpose();
C = m * C;
// Extract shear and scale.
float alpha, sx, sy;
sx = C.M11;
sy = C.M22; sy = C.M22;
alpha = C.M12 / C.M22; alpha = C.M12 / C.M22;
beta = (C.M21 == 0.0f) ? 0.0f : 1 / ((C.M11 / C.M21) - alpha);
sx = (beta == 0.0f) ? C.M11 : C.M21 / beta;
drawable.Scale = new Vector2(sx, sy); drawable.Scale = new Vector2(sx, sy);
drawable.Shear = new Vector2(-alpha, -beta); drawable.Shear = new Vector2(-alpha, 0);
} }
} }
} }