RectTransformExt.cs

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using UnityEngine;
 
public static class RectTransformExt
{
    public static void GetLocalCorners(this RectTransform rt, Vector3[] fourCornersArray, Canvas canvas, float insetL, float insetR, float insetY)
    {
        rt.GetLocalCorners(fourCornersArray);
        Vector3 vector = canvas.CorrectLossyScale();
        fourCornersArray[0].x += insetL * vector.x;
        fourCornersArray[0].y += insetY * vector.y;
        fourCornersArray[1].x += insetL * vector.x;
        fourCornersArray[1].y -= insetY * vector.y;
        fourCornersArray[2].x -= insetR * vector.x;
        fourCornersArray[2].y -= insetY * vector.y;
        fourCornersArray[3].x -= insetR * vector.x;
        fourCornersArray[3].y += insetY * vector.y;
    }
 
    public static void GetScreenCorners(this RectTransform rt, Vector3[] fourCornersArray, Canvas canvas, float insetL, float insetR, float insetY)
    {
        rt.GetWorldCorners(fourCornersArray);
        if (canvas.renderMode == RenderMode.ScreenSpaceCamera)
        {
            for (int i = 0; i < 4; i++)
            {
                fourCornersArray[i] = canvas.worldCamera.WorldToScreenPoint(fourCornersArray[i]);
                fourCornersArray[i].z = 0f;
            }
        }
        Vector3 vector = canvas.CorrectLossyScale();
        fourCornersArray[0].x += insetL * vector.x;
        fourCornersArray[0].y += insetY * vector.y;
        fourCornersArray[1].x += insetL * vector.x;
        fourCornersArray[1].y -= insetY * vector.y;
        fourCornersArray[2].x -= insetR * vector.x;
        fourCornersArray[2].y -= insetY * vector.y;
        fourCornersArray[3].x -= insetR * vector.x;
        fourCornersArray[3].y += insetY * vector.y;
    }
}