问题描述
我正在尝试编写一个程序,用于确定圆圈是否在内部/触摸矩形。用户放入圆的中心点和半径,以及矩形的两个对角点。
I'm trying to write a program that decides whether a circle is inside/touching a rectangle. The user puts in the center point for the circle and the radius, and two diagonal points for the rectangle.
我不确定如何包含圆周长的所有点,以告知矩形中至少有一个点/接触矩形。任何人都知道如何做到这一点?
I'm not sure how to include all points of the circumference of the circle, to tell that there is at least one point in/touching the rectangle. Anyone sure how to do this?
当我运行当前程序时,我会故意输入一个矩形内部的圆点,并且应该使用if我提出的陈述,但它打印出错误的答案。
When I run my current program, I'll purposely enter points of a circle being inside of a rectangle, and should work with the if statements I put, but it prints out the wrong answer.
import java.util.Scanner;
public class lab4 {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
double cx, cy, x, y, r, p1x, p1y, p2x, p2y, max;//input
String a;
System.out.print("Enter cx: ");
cx = in.nextDouble();
System.out.print("Enter cy: ");
cy = in.nextDouble();
System.out.print("Enter r: ");
r = in.nextDouble();
System.out.println("Enter x value of point 1:");
p1x = in.nextDouble();
System.out.println("Enter y value of point 1:");
p1y = in.nextDouble();
System.out.println("Enter x value of point 2:");
p2x = in.nextDouble();
System.out.println("Enter y value of point 2:");
p2y = in.nextDouble();
max = p2x;
if (p1x > max)
max = p1x;
max = p2y;
if (p1y > max)
max = p1y;
if (cx >= p1x && cx <= p2x)
a = "Circle is inside of Rectangle";
if (cx >= p1x && cx <= p2x)
a = "Circle is inside of Rectangle";
if (cx+r >= p1x && cx+r <= p2x)
a = "Circle is inside of Rectangle";
if (cx-r >= p1x && cx-r <= p2x)
a = "Circle is inside of Rectangle";
if (cy >= p1y && cy <= p2y)
a = "Circle is inside of Rectangle";
if (cy >= p1y && cy <= p2y)
a = "Circle is inside of Rectangle";
if (cy+r >= p1y && cy+r <= p2y)
a = "Circle is inside of Rectangle";
if (cy-r >= p1y && cy-r <= p2y)
a = "Circle is inside of Rectangle";
else
a = "Circle is outside of Rectangle";
System.out.println(a);
推荐答案
您的else语句仅以最后一条if语句为条件。因此,如果最后一个if语句为false,则会执行else语句。你可能想要:
Your else statement is only conditional on the last if statement. So if the last if statement is false, your else statement gets executed. You probably instead want:
if ...
else if ...
else if ...
else
只有在以前所有if语句都为假的情况下才执行else 。
which executes the else only if all the previous "if" statements are false.
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