通过math类方法,打印出一个近似圆

Question

通过math类方法,打印出一个近似圆

Answer 1

import java.lang.Math;
public class FirstProject {
public static void main(String[] args) {
paint(40); //半径40
}
public static void paint(int r) {
//假定圆心在坐标(r,r);
int y = r * 2; //y的坐标开始
int x = 0;
int c = 0; //中间空格数量
int z = 2; //每行递减量
for (int j = r * 2; j >= 0; j=j-z) {
x = getX(r,y);
System.out.print(getSpace(x) + "*");
c = (r-x)*2;
System.out.println(getSpace(c) + "*");
y-=z;
}
}
public static int getX(int r,int y) {
//解圆标准方程的
int x = y - r;
double t = Math.sqrt((r * r) - (x * x));
return (int) Math.round(r-t);
}
public static String getSpace(int i) {
String s = "";
for (int j = 0; j < i; j++) {
s += " ";
}
return s;
}
}