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Move scaling logic out of OsuSelectionHandler for reuse

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Dean Herbert
2021-05-18 18:57:52 +09:00
parent 87833bfb61
commit a0f67ef3bc
2 changed files with 21 additions and 17 deletions
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20
osu.Game/Screens/Edit/Compose/Components/SelectionHandler.cs
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@ -375,6 +375,26 @@ namespace osu.Game.Screens.Edit.Compose.Components
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>
protected 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>