疯狂java讲义第三章的用*画近似圆的问题（附自己代码求高手指点）
题目如下：通过通过API文档查询Math类的方法，打印如下所示的近似圆，只要给定不同半径，圆的大小随之发生改变；
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* *

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我上面画的圆不是很好，但是所有点都画出来了，位置基本如此，我自己写了一段代码，基本能画出圆但是总是不太像，求高手指点呀

Java code

import java.lang.Math;import java.io.*;/*** 绘制近似圆*/public class Circle{    /**    * 圆的半径    * @param r:圆的的半径    */    private double r;    public double getR()    {        return r;    }        public void setR(double R)    {        r = R;    }    public void draw()    {        System.out.print("请输入半径");        try           {           //读入半径            BufferedReader br =new BufferedReader(new InputStreamReader(System.in));           r = Double.parseDouble(br.readLine()) ;           }       catch(IOException e)           {               e.toString();           }                int x1,x2,y;        String str;        for (int i = 0; i <= 12; i++)        {            if (i == 0)            {                y = Math.round((float)(r-Math.cos(Math.toRadians(15*i))*r));            }else{                y = Math.round((float)(r-Math.cos(Math.toRadians(15*i))*r))-Math.round((float)(r-Math.cos(Math.toRadians(15*i-15))*r));            }            x1 = Math.round((float)(r-Math.sin(Math.toRadians(15*i))*r));            x2 = Math.round((float)(r+Math.sin(Math.toRadians(15*i))*r));            str = "";            if (i != 0 && i != 12)            {                if (y == 0)                {                    continue;                }            }else if(i == 12){                System.out.println("");            }            for (int j=0; j <y; j++)            {                System.out.println("");            }            for (int k=0; k < x1; k++)            {                str+=" ";            }            str+="*";            for (int k=0; k < x2-x1; k++)            {                str+=" ";            }                        str+="*";            System.out.print(str+"角度"+15*i+"y="+y+" x1="+x1+" x2="+x2);                    }        System.out.println("");        draw();    }    public static void main(String args[])    {        new Circle().draw();      }    }

[解决办法]
import java.lang.Math;

public class Circle{
private int r=10;
private int initblank;
private int middleblank;

public Circle(int r){
this.r=r;
}

public void setInitblank(int initblank){
this.initblank=initblank;
}
public double getInitblank(){
return initblank;
}

public void setMiddleblank(int middleblank){
this.middleblank=middleblank;
}
public double getMiddleblank(){
return middleblank;
}

public String getInitblanks(int t){
String blank=" ";

for(int k=0;k<t-1;k++){
blank=blank+" ";
}
return blank;
}

public String getMiddleblanks(int t){
String blank=" ";

for(int k=0;k<t-1;k++){
blank=blank+" ";
}
return blank;
}
public static void main(String[] args){
double pi=java.lang.Math.PI;
double basepi=pi/6;
Circle circle=new Circle(5);
for(int i=0;i<=6;i++){
double countpi=i*basepi;
// System.out.println(java.lang.Math.sin(countpi));
// System.out.println(java.lang.Math.sin(java.lang.Math.PI));

circle.middleblank=(int)(circle.r*(java.lang.Math.sin(countpi)));

circle.initblank=(int)(circle.r-circle.middleblank);
if( circle.middleblank==0.0)
System.out.println(circle.getInitblanks(circle.initblank)+"*");
else if( circle.initblank==0.0)
System.out.println("*"+circle.getMiddleblanks(circle.middleblank)+circle.getMiddleblanks(circle.middleblank)+"*");
else
System.out.println(circle.getInitblanks(circle.initblank)+"*"+circle.getMiddleblanks(circle.middleblank)+circle.getMiddleblanks(circle.middleblank)+"*");
}
}


}