Java求线的交点,并找到它的坐标和它右边或下面的最近邻

我正在努力寻找一种方法来获得坐标x和坐标Y的最近点,如果它们不存在的话。

public class CheckForIntersection {

    double x1, x2, x3, x4, y1, y2, y3, y4, a, b, c, d, e, f, checkLinear, x, y;

    CheckForIntersection(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4) {
        this.x1 = x1;
        this.y1 = y1;
        this.x2 = x2;
        this.y2 = y2;
        this.x3 = x3;
        this.y3 = y3;
        this.x4 = x4;
        this.y4 = y4;

        checkintersection();
    }

    public double getx() {
        return x;
    }

    public double gety() {
        return y;
    }

    public void checkintersection() {
        a = y1 - y2;
        b = -(x1 - x2);
        c = y3 - y4;
        d = -(x3 - x4);
        e = (y1 - y2) * x1 - (x1 - x2) * y1;
        f = (y3 - y4) * x3 - (x3 - x4) * y3;

        checkLinear = (a * d) - (b * c);

        x = ((e * d) - (b * f)) / checkLinear;
        y = ((a * f) - (e * c)) / checkLinear;

        System.out.println(a + " " + b + " " + c + " " + d + " " + e + " " + f);
        checknearestNeighbour(x, y);

        if (checkLinear == 0) {
            System.out.println("the intersection is parallel");
        } else {
            System.out.println("X coordinate:" + x + " X coordinate:" + y);
        }
    }
}

以下参数的结果应为2.88889,1.1111。