/// <summary>
/// Computes the relative anchor in local space given a resolution.
/// </summary>
/// <param name="res">The element's parent's current dimension</param><z
/// <returns>The anchor in local space</returns>
public static int2 AnchoredToRelative(this AnchoredState state, int2 res)
{
switch (state)
{
case AnchoredState.BottomLeft:
return(-res / 2);
case AnchoredState.MiddleLeft:
return(new int2(-res.x / 2, 0));
case AnchoredState.TopLeft:
return(new int2(-res.x / 2, res.y / 2));
case AnchoredState.BottomCenter:
return(new int2(0, -res.y / 2));
case AnchoredState.MiddleCenter:
return(new int2(0, 0));
case AnchoredState.TopCenter:
return(new int2(0, res.y / 2));
case AnchoredState.BottomRight:
return(new int2(res.x / 2, -res.y / 2));
case AnchoredState.MiddleRight:
return(new int2(res.x / 2, 0));
case AnchoredState.TopRight:
return(res / 2);
default:
throw new System.ArgumentException($"{state} is not a valid anchor!");
}
}
/// <summary>
/// Returns the position that the anchor is supposedly anchored to.
/// </summary>
/// <param name="state">The current state of the anchor.</param>
/// <param name="res">The current resolution we want to consider.</param>
/// <returns>The relative screenspace position that the anchor is referencing.</returns>
public static int2 AnchoredTo(this AnchoredState state, int2 res)
{
switch (state)
{
case AnchoredState.LeftColumn | AnchoredState.BottomRow:
return(default);
case AnchoredState.LeftColumn | AnchoredState.MiddleRow:
return(new int2(0, res.y / 2));
case AnchoredState.LeftColumn | AnchoredState.TopRow:
return(new int2(0, res.y));
case AnchoredState.MiddleColumn | AnchoredState.BottomRow:
return(new int2(res.x / 2, 0));
case AnchoredState.MiddleColumn | AnchoredState.MiddleRow:
return(res / 2);
case AnchoredState.MiddleColumn | AnchoredState.TopRow:
return(new int2(res.x / 2, res.y));
case AnchoredState.RightColumn | AnchoredState.BottomRow:
return(new int2(res.x, 0));
case AnchoredState.RightColumn | AnchoredState.MiddleRow:
return(new int2(res.x, res.y / 2));
case AnchoredState.RightColumn | AnchoredState.TopRow:
return(res);
default:
throw new System.ArgumentException($"{state} is not a valid state to anchor to!");
}
}
/// <summary>
/// Transforms a rect transform's anchor preset to an enum.
/// </summary>
public static AnchoredState ToAnchor(this RectTransform transform)
{
var min = transform.anchorMin;
AnchoredState anchor = default;
{ // Bottom Row
if (min == default)
{
anchor = AnchoredState.BottomLeft;
}
if (min == new Vector2(0.5f, 0f))
{
anchor = AnchoredState.BottomCenter;
}
if (min == new Vector2(1f, 0f))
{
anchor = AnchoredState.BottomRight;
}
}
{ // Middle Row
if (min == new Vector2(0f, 0.5f))
{
anchor = AnchoredState.MiddleLeft;
}
if (min == new Vector2(0.5f, 0.5f))
{
anchor = AnchoredState.MiddleCenter;
}
if (min == new Vector2(1f, 0.5f))
{
anchor = AnchoredState.MiddleRight;
}
}
{ // Top Row
if (min == new Vector2(0f, 1f))
{
anchor = AnchoredState.TopLeft;
}
if (min == new Vector2(0.5f, 1f))
{
anchor = AnchoredState.TopCenter;
}
if (min == new Vector2(1f, 1f))
{
anchor = AnchoredState.TopRight;
}
}
return(anchor);
}
public static bool IsAtColumn(this AnchoredState state, AnchoredState column)
{
switch (state)
{
case var _ when IsAtRow(state, AnchoredState.TopRow):
return((state.ShiftRightBy(2) & (int)column) > 0);
case var _ when IsAtRow(state, AnchoredState.MiddleRow):
return((state.ShiftRightBy(1) & (int)column) > 0);
case var _ when IsAtRow(state, AnchoredState.BottomRow):
return((state & column) > 0);
default:
return(false);
}
}
public static AnchoredState ToAnchor(this RectTransform transform)
{
var min = transform.anchorMin;
AnchoredState anchor = 0;
switch (min.x)
{
case 0f:
anchor = AnchoredState.LeftColumn;
break;
case 0.5f:
anchor = AnchoredState.MiddleColumn;
break;
case 1f:
anchor = AnchoredState.RightColumn;
break;
default:
throw new System.ArgumentException($"Cannot map: {min.x} as a valid AnchoredState!");
}
switch (min.y)
{
case 0f:
anchor |= AnchoredState.BottomRow;
break;
case 0.5f:
anchor |= AnchoredState.MiddleRow;
break;
case 1f:
anchor |= AnchoredState.RightColumn;
break;
default:
throw new System.ArgumentException($"Cannot map: {min.y} as a valid AnchoredState!");
}
return(anchor);
}
public static void AnchorOf(this RectTransform transform, out float2 distance, out AnchoredState anchor)
{
anchor = transform.ToAnchor();
distance = anchor.AnchoredTo() - new float2(transform.position.x, transform.position.y);
}
public static int2 AnchoredTo(this AnchoredState state)
{
var res = new int2(Screen.width, Screen.height);
return(state.AnchoredTo(res));
}
internal static int ShiftRightBy(this AnchoredState state, int shift)
{
var value = (int)state;
return(value >> shift);
}
public static bool IsAtRow(this AnchoredState lhs, AnchoredState rhs)
{
return((lhs & rhs) > 0);
}