直线与圆交点间距_牛客题霸

圆心为，半径为的圆与直线交于两点、（、两点可能重合），求、两点之间的间距。具体而言，你需要实现一个函数，接受两个参数：圆 ; 直线。你需要计算出、两点之间的间距，并将其作为该函数的返回值。

输入描述:

你只需要实现核心函数即可，不需要关注输入格式。

输出描述:

你只需要实现核心函数即可，不需要关注输出格式。

示例1

输入

0 0 1
0 0 0 1

输出

2.000000

备注:

数据保证直线与圆不相离。特别的，当直线与圆相切时，间距  的值为 。注意，由于浮点数存在误差，只要你的返回值和真实值之间的误差在  以内，你的答案就会被认为是正确的。

加载中...

import java.util.Scanner;

class Point {
    double x, y;
    Point(double A, double B) {
        x = A;
        y = B;
    }
}

class Line {
    Point point_A, point_B;
    Line(Point A, Point B) {
        point_A = A;
        point_B = B;
    }
}

class Circle {
    Point O;
    int r;
    Circle(Point A, int B) {
        O = A;
        r = B;
    }
}

public class Main {
    public static double getDistance(Circle circle, Line l) {
        // 请在这里实现你的代码
        return 0.00;
    }

public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        double ox = scanner.nextDouble();
        double oy = scanner.nextDouble();
        int r = scanner.nextInt();
        
        double x1 = scanner.nextDouble();
        double y1 = scanner.nextDouble();
        double x2 = scanner.nextDouble();
        double y2 = scanner.nextDouble();
        
        Point center = new Point(ox, oy);
        Circle circle = new Circle(center, r);
        
        Point p1 = new Point(x1, y1);
        Point p2 = new Point(x2, y2);
        Line l = new Line(p1, p2);
        
        double result = getDistance(circle, l);
        System.out.printf("%.6f\n", result);
        
        scanner.close();
    }
}

#include <bits/stdc++.h>
using namespace std;

struct point{
    double x,y;
    point(double A,double B){
        x=A,y=B;
    }
    point() = default;
};

struct line{
    point point_A,point_B;
    line(point A,point B){
        point_A = A,point_B = B;
    }
    line() = default;
};

struct Circle{
    point O;
    int r;
    Circle(point A,int B){
        O=A,r=B;
    }
    Circle() = default;
};

double getDistance(const Circle& circle, const line& l) {
    // 请在这里实现你的代码
}

int main() {
    double ox, oy, r;
    double x1, y1, x2, y2;
    
    cin >> ox >> oy >> r;
    cin >> x1 >> y1 >> x2 >> y2;
    
    point center(ox, oy);
    Circle circle(center, (int)r);
    
    point p1(x1, y1);
    point p2(x2, y2);
    line l(p1, p2);
    
    double result = getDistance(circle, l);
    cout << fixed << setprecision(6) << result << endl;
    
    return 0;
}