UGUI-判断是否在矩阵范围内

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Matrix : MonoBehaviour
{

    // Update is called once per frame
    void Update()
    {

        //Vector2 ve = RectTransformUtility.WorldToScreenPoint(Camera.main,Input.mousePosition);
        float X = Input.mousePosition.x - Screen.width / 2f;
        float Y = Input.mousePosition.y - Screen.height / 2f;
        //Debug.Log(X);
        //Debug.Log(Y);
        Debug.Log(isInside(-110, 130, 110, -130, X, Y));
    }


    //判断一个点是否在矩形内部
    public static bool isInside(double x1, double y1, double x4, double y4, double x, double y)
    {
        //默认:1点在左上,4点在右下
        if (x <= x1)
        {//在矩形左侧
            return false;
        }
        if (x >= x4)
        {//在矩形右侧
            return false;
        }
        if (y >= y1)
        {//在矩形上侧
            return false;
        }
        if (y <= y4)
        {//在矩形下侧
            return false;
        }
        return true;
    }

    public static bool isInside(double x1, double y1, double x4, double y4,
            double x2, double y2, double x3, double y3, double x, double y)
    {
        //矩形边平行于x轴或y轴
        if (y1 == y2)
        {
            return isInside(x1, y1, x4, y4, x, y);
        }
        //坐标变换，把矩形转成平行，所有点跟着动
        double a = Math.Abs(y4 - y3);
        double b = Math.Abs(x4 - x3);
        double c = Math.Sqrt(a * a + b * b);
        double sin = a / c;
        double cos = b / c;
        double x11 = cos * x1 + sin * y1;
        double y11 = -x1 * sin + y1 * cos;
        double x44 = cos * x4 + sin * y4;
        double y44 = -x4 * sin + y4 * cos;
        double xx = cos * x + sin * y;
        double yy = -x * sin + y * cos;
        //旋转完成，又变成上面一种平行的情况
        return isInside(x11, y11, x44, y44, xx, yy);
    }
}