MARKUS

using MarkupToPDF.Common;

using System;

using System.Windows.Controls;

        public static IEnumerable<CommentUserInfo> FindComment(this System.Windows.Controls.Canvas canvas, Rect searchRect)

        {

            foreach (CommentUserInfo child in canvas.FindAllChildren(x=>x is CommentUserInfo))

            {

                if (child is CommentUserInfo comment)

                {

                    if (searchRect.IntersectsWith(child.ItemRect))

                    {

                        yield return child;

                    }

                }

            }

        }

        public static CommentUserInfo FindDistanceComment(this Canvas canvas, Point point,double squareSize = 1)

        {

            double minDistance = double.MaxValue;

            CommentUserInfo closestComment = null;

            Rect searchRect = new Rect(

                point.X - squareSize,

                point.Y - squareSize,

                squareSize * 2,

                squareSize * 2

            );

            foreach (CommentUserInfo child in canvas.FindComment(searchRect))

            {

                if (child is CommentUserInfo comment)

                {

                    double left = comment.ItemRect.Left;

                    double top = comment.ItemRect.Top;

                    double centerX = left + comment.ItemRect.Width / 2;

                    double centerY = top + comment.ItemRect.Height / 2;

                    double distance = Math.Sqrt(Math.Pow(point.X - centerX, 2) + Math.Pow(point.Y - centerY, 2));

                    if (distance < minDistance)

                    {

                        minDistance = distance;

                        closestComment = comment;

                    }

                }

            }

            return closestComment;

        }