LunarBrushManager/PointToRect.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;

namespace SHomeWorkshop.LunarTools
{
    public static class PointToRect
    {
        /// <summary>
        /// 求一个点与矩形中心点的连线与矩形的边缘的交点。
        /// </summary>
        /// <param name="rect">矩形</param>
        /// <param name="point">矩形内部或外部一点。</param>
        /// <returns></returns>
        public static ArrowPoints GetCrossPointToRect(Rect rect, Point point)
        {
            Point center = new Point(rect.Left + rect.Width / 2, rect.Top + rect.Height / 2);

            ArrowPoints arrowPt = new ArrowPoints();
            double arrowHeight = 10;

            if (point.X == center.X)
            {
                if (point.Y < center.Y)//y轴正向。
                {

                    arrowPt.Top = new Point(center.X, rect.Top);
                    arrowPt.Start = new Point(center.X + arrowHeight / Math.Sqrt(3), rect.Top - arrowHeight);
                    arrowPt.End = new Point(center.X - arrowHeight / Math.Sqrt(3), rect.Top - arrowHeight);
                    return arrowPt;
                }
                else if (point.Y == center.Y)//正好是Rect中心。这几乎不可能出现。
                {
                    //为防止出现这一情况。

                    point.X += 1; point.Y += 1;

                    //arrowPt.Top = center;
                    //arrowPt.Start = center;
                    //arrowPt.End = center;
                    //return arrowPt;
                }
                else if (point.Y > center.Y)//y轴负向。
                {

                    arrowPt.Top = new Point(center.X, rect.Bottom);
                    arrowPt.Start = new Point(center.X - arrowHeight / Math.Sqrt(3), rect.Bottom + arrowHeight);
                    arrowPt.End = new Point(center.X + arrowHeight / Math.Sqrt(3), rect.Bottom + arrowHeight);
                    return arrowPt;
                }
            }

            if (point.Y == center.Y)
            {
                if (point.X > center.X)
                {

                    arrowPt.Top = new Point(rect.Right, center.Y);//X轴正向。