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[ExecuteAlways, DisallowMultipleComponent, RequireComponent(typeof(RectTransform))]
public class CutRectSetter : UIBehaviour, IClipper
{
[SerializeField]
private Canvas _canvas;
[SerializeField]
private MaskableGraphic _clipTarget;
private bool m_shouldRecalculateClipRects = false;
private Rect m_prevClipRect = default;
private bool m_hasClipped = false;
public void PerformClipping()
{
if (ReferenceEquals(_canvas, null) || null == _clipTarget)
{
return;
}
RectTransform selfRectTransform = transform as RectTransform;
RectTransform targetTectTransform = _clipTarget.transform as RectTransform;
if (!IsInsideRect(selfRectTransform, targetTectTransform))
{
CancelClip();
m_prevClipRect = default;
m_shouldRecalculateClipRects = false;
return;
}
Rect currentRect = selfRectTransform.rect;
Vector2 selfPivot = selfRectTransform.pivot;
currentRect.position = SwitchToRectTransform(selfRectTransform, targetTectTransform);
Vector2 delta = new Vector2(-currentRect.width * selfPivot.x, -currentRect.height * selfPivot.y);
currentRect.position += delta;
m_shouldRecalculateClipRects = m_shouldRecalculateClipRects || m_prevClipRect != currentRect;
if (m_shouldRecalculateClipRects)
{
_clipTarget.SetClipRect(default, true);
_clipTarget.SetClipRect(currentRect, true);
_clipTarget.Cull(currentRect, true);
m_prevClipRect = currentRect;
m_shouldRecalculateClipRects = false;
}
}
[ContextMenu(nameof(CancelClip))]
private void CancelClip()
{
_clipTarget.SetClipRect(default, true);
m_hasClipped = false;
}
protected override void OnEnable()
{
base.OnEnable();
m_shouldRecalculateClipRects = true;
ClipperRegistry.Register(this);
MaskUtilities.Notify2DMaskStateChanged(this);
}
protected override void OnDisable()
{
base.OnDisable();
ClipperRegistry.Unregister(this);
MaskUtilities.Notify2DMaskStateChanged(this);
CancelClip();
}
protected override void OnTransformParentChanged()
{
m_shouldRecalculateClipRects = true;
}
protected override void OnCanvasHierarchyChanged()
{
m_shouldRecalculateClipRects = true;
}
#region some utils
private readonly Vector2 RECT_TOP = new Vector2(0.5f, 1f);
private readonly Vector2 RECT_BOTTOM = new Vector2(0.5f, 0f);
private readonly Vector2 RECT_LEFT = new Vector2(0f, 0.5f);
private readonly Vector2 RECT_RIGHT = new Vector2(1f, 0.5f);
private readonly Vector2 RECT_CENTER = new Vector2(0.5f, 0.5f);
private readonly Vector2 RECT_BOTTOM_LEFT = new Vector2(0f, 0f);
private readonly Vector2 RECT_BOTTOM_RIGHT = new Vector2(1f, 0f);
private readonly Vector2 RECT_TOP_LEFT = new Vector2(0f, 1f);
private readonly Vector2 RECT_TOP_RIGHT = new Vector2(1f, 1f);
private Vector2 SwitchToRectTransform(RectTransform from, RectTransform to)
{
Vector2 screenP = RectTransformUtility.WorldToScreenPoint(null, from.position);
RectTransformUtility.ScreenPointToLocalPointInRectangle(to, screenP, null, out Vector2 localPoint);
return localPoint;
}
private bool IsInsideRect(RectTransform rectTransform, RectTransform outterRect)
{
Vector3 checkWorldPoint = RectOffsetToWorld(rectTransform, RECT_BOTTOM_LEFT);
bool bottomLeftOut = !RectTransformUtility.RectangleContainsScreenPoint(outterRect, checkWorldPoint);
checkWorldPoint = RectOffsetToWorld(rectTransform, RECT_BOTTOM_RIGHT);
bool bottomRightOut = !RectTransformUtility.RectangleContainsScreenPoint(outterRect, checkWorldPoint);
checkWorldPoint = RectOffsetToWorld(rectTransform, RECT_TOP_LEFT);
bool topLeftOut = !RectTransformUtility.RectangleContainsScreenPoint(outterRect, checkWorldPoint);
checkWorldPoint = RectOffsetToWorld(rectTransform, RECT_TOP_RIGHT);
bool topRightOut = !RectTransformUtility.RectangleContainsScreenPoint(outterRect, checkWorldPoint);
return !(bottomLeftOut || bottomRightOut || topLeftOut || topRightOut);
}
private Vector3 RectOffsetToWorld(RectTransform rectTransform, Vector2 normalizedRectPosition)
{
Rect selfRect = rectTransform.rect;
Vector2 localposition = Vector2.zero;
if (RECT_CENTER == normalizedRectPosition)
{
localposition = selfRect.center;
}
else if (RECT_TOP == normalizedRectPosition)
{
localposition = new Vector2(selfRect.center.x, selfRect.yMax);
}
else if (RECT_BOTTOM == normalizedRectPosition)
{
localposition = new Vector2(selfRect.center.x, selfRect.yMin);
}
else if (RECT_LEFT == normalizedRectPosition)
{
localposition = new Vector2(selfRect.xMin, selfRect.center.y);
}
else if (RECT_RIGHT == normalizedRectPosition)
{
localposition = new Vector2(selfRect.xMax, selfRect.center.y);
}
else if (RECT_TOP_LEFT == normalizedRectPosition)
{
localposition = new Vector2(selfRect.xMin, selfRect.yMax);
}
else if (RECT_TOP_RIGHT == normalizedRectPosition)
{
localposition = selfRect.max;
}
else if (RECT_BOTTOM_LEFT == normalizedRectPosition)
{
localposition = selfRect.min;
}
else if (RECT_BOTTOM_RIGHT == normalizedRectPosition)
{
localposition = new Vector2(selfRect.xMax, selfRect.yMin);
}
else
{
Debug.LogError($"{normalizedRectPosition} is not a normalized rect position");
}
return rectTransform.TransformPoint(localposition);
}
#endregion
}
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