Graphics/GraphicsUtility.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Media;

namespace DrawingPad.Graphics
{
    public static class GraphicsUtility
    {
        /// <summary>
        /// 获取矩形的中心点
        /// </summary>
        /// <param name="rect"></param>
        /// <returns></returns>
        public static Point GetCenter(this Rect rect)
        {
            return new Point(rect.Location.X + rect.Width / 2, rect.Location.Y + rect.Height / 2);
        }

        /// <summary>
        /// 获取点P相对于图形的位置
        /// 点P可以是任意一点
        /// </summary>
        /// <param name="graphics"></param>
        /// <param name="p"></param>
        /// <returns></returns>
        public static RelativeLocation GetRelativeLocation(GraphicsBase graphics, Point p)
        {
            Rect bounds = graphics.GetBounds();

            if (p.X >= bounds.TopLeft.X && p.X <= bounds.TopRight.X && p.Y <= bounds.TopLeft.Y)
            {
                // 点在图形的上方
                return RelativeLocation.Top;
            }

            if (p.X <= bounds.TopLeft.X && p.Y >= bounds.TopLeft.Y && p.Y <= bounds.BottomLeft.Y)
            {
                // 点在图形的左边
                return RelativeLocation.Left;
            }

            if (p.Y >= bounds.BottomLeft.Y && p.X >= bounds.TopLeft.X && p.X <= bounds.TopRight.X)
            {
                // 点在图形的下面
                return RelativeLocation.Bottom;
            }

            if (p.X >= bounds.TopRight.X && p.Y >= bounds.TopRight.Y && p.Y <= bounds.BottomRight.Y)
            {
                // 点在图形的右边
                return RelativeLocation.Right;
            }

            if (p.X < bounds.TopLeft.X && p.Y < bounds.TopLeft.Y)
            {
                // 点在图形的左上方