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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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
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(); } }
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)+"*");
}
}
}