/// <summary>
/// src用描点对齐tar的描点，tar确定src的位置
/// </summary>
/// <param name="src"></param>
/// <param name="srcSide"></param>
/// <param name="tar"></param>
/// <param name="tarSide"></param>
/// <param name="area"></param>
public static void AnchorTo(RectTransform src, UGUISide srcSide, RectTransform tar, UGUISide tarSide, Transform canvas)
{
if (null == tar || tar == src)
{
return;
}
Bounds srcBounds = RectTransformUtility.CalculateRelativeRectTransformBounds(canvas, src); //计算src的包围盒
Bounds tarBounds = RectTransformUtility.CalculateRelativeRectTransformBounds(canvas, tar); //计算tar的包围盒
Vector2 srcOffset = GetBoundsOffset(srcBounds, srcSide); //计算描点的偏移量
Vector2 tarOffset = GetBoundsOffset(tarBounds, tarSide); //计算描点的偏移量
Vector2 tarCenter = tarBounds.center;
//计算src相对于tar的位置
src.anchoredPosition = (tarCenter - tarOffset + srcOffset);
D.log("src.anchoredPosition=" + src.anchoredPosition);
}
public static Vector2 GetBoundsOffset(Bounds bounds, UGUISide side)
{
Vector2 offset = Vector2.zero;
switch (side)
{
case UGUISide.Bottom:
offset.y = bounds.extents.y;
break;
case UGUISide.BottomLeft:
offset.x = bounds.extents.x;
offset.y = bounds.extents.y;
break;
case UGUISide.BottomRight:
offset.x = -bounds.extents.x;
offset.y = bounds.extents.y;
break;
case UGUISide.Left:
offset.x = bounds.extents.x;
break;
case UGUISide.Right:
offset.x = -bounds.extents.x;
break;
case UGUISide.Top:
offset.y = -bounds.extents.y;
break;
case UGUISide.TopLeft:
offset.x = bounds.extents.x;
offset.y = -bounds.extents.y;
break;
case UGUISide.TopRight:
offset.x = -bounds.extents.x;
offset.y = -bounds.extents.y;
break;
}
return(offset);
}
