UIAnchor.Update C# (CSharp) Method

	void Update ()
	{
		if (mAnim != null && mAnim.enabled && mAnim.isPlaying) return;
		
		bool useCamera = false;

		if (panelContainer != null)
		{
			if (panelContainer.clipping == UIDrawCall.Clipping.None)
			{
				// Panel has no clipping -- just use the screen's dimensions
				float ratio = (mRoot != null) ? (float)mRoot.activeHeight / Screen.height * 0.5f : 0.5f;
				mRect.xMin = -Screen.width * ratio;
				mRect.yMin = -Screen.height * ratio;
				mRect.xMax = -mRect.xMin;
				mRect.yMax = -mRect.yMin;
			}
			else
			{
				// Panel has clipping -- use it as the rect
				Vector4 pos = panelContainer.clipRange;
				mRect.x = pos.x - (pos.z * 0.5f);
				mRect.y = pos.y - (pos.w * 0.5f);
				mRect.width = pos.z;
				mRect.height = pos.w;
			}
		}
		else if (widgetContainer != null)
		{
			// Widget is used -- use its bounds as the container's bounds
			Transform t = widgetContainer.cachedTransform;
			Vector3 ls = t.localScale;
			Vector3 lp = t.localPosition;

			Vector3 size = widgetContainer.relativeSize;
			Vector3 offset = widgetContainer.pivotOffset;
			offset.y -= 1f;
			
			offset.x *= (widgetContainer.relativeSize.x * ls.x);
			offset.y *= (widgetContainer.relativeSize.y * ls.y);
			
			mRect.x = lp.x + offset.x;
			mRect.y = lp.y + offset.y;
			
			mRect.width = size.x * ls.x;
			mRect.height = size.y * ls.y;
		}
		else if (uiCamera != null)
		{
			useCamera = true;
			mRect = uiCamera.pixelRect;
		}
		else return;

		float cx = (mRect.xMin + mRect.xMax) * 0.5f;
		float cy = (mRect.yMin + mRect.yMax) * 0.5f;
		Vector3 v = new Vector3(cx, cy, 0f);

		if (side != Side.Center)
		{
			if (side == Side.Right || side == Side.TopRight || side == Side.BottomRight) v.x = mRect.xMax;
			else if (side == Side.Top || side == Side.Center || side == Side.Bottom) v.x = cx;
			else v.x = mRect.xMin;

			if (side == Side.Top || side == Side.TopRight || side == Side.TopLeft) v.y = mRect.yMax;
			else if (side == Side.Left || side == Side.Center || side == Side.Right) v.y = cy;
			else v.y = mRect.yMin;
		}

		float width  = mRect.width;
		float height = mRect.height;

		v.x += relativeOffset.x * width;
		v.y += relativeOffset.y * height;

		if (useCamera)
		{
			if (uiCamera.orthographic)
			{
				v.x = Mathf.Round(v.x);
				v.y = Mathf.Round(v.y);

				if (halfPixelOffset && mNeedsHalfPixelOffset)
				{
					v.x -= 0.5f;
					v.y += 0.5f;
				}
			}
			v.z = uiCamera.WorldToScreenPoint(mTrans.position).z;
			v = uiCamera.ScreenToWorldPoint(v);
		}
		else
		{
			v.x = Mathf.Round(v.x);
			v.y = Mathf.Round(v.y);

			if (panelContainer != null)
			{
				v = panelContainer.cachedTransform.TransformPoint(v);
			}
			else if (widgetContainer != null)
			{
				Transform t = widgetContainer.cachedTransform.parent;
				if (t != null) v = t.TransformPoint(v);
			}
			v.z = mTrans.position.z;
		}
		
		// Wrapped in an 'if' so the scene doesn't get marked as 'edited' every frame
		if (mTrans.position != v) mTrans.position = v;
	}
}