java代码做个圆圈 java编写一个圆形

用java画一个圆

import java.awt.*;

import java.applet.*;

import java.awt.event.*;

class MyCanvas extends Canvas

{

int x,y,r,n;

int x0,y0;

MyCanvas()

{

setSize(100,100);

setBackground(Color.red);

}

public void setX(int x)

{

this.x=x;

}

public void setY(int y)

{

this.y=y;

}

public void setR(int r)

{

this.r=r;

}

public void setN(int n)

{

this.n=n;

}

public void paint(Graphics g1)

{

for(int i=0;i=360;i=i+360/n)

{

x0 = (int)(x+r*Math.cos(i));

y0 = (int)(y+r*Math.sin(i));

g1.drawString("*",x0,y0);}

}

}

public class e1 extends Applet implements ActionListener

{

MyCanvas canvas;

TextField inputR,inputX,inputY,inputN;

Label label1,label2,label3;

Button b1,b2;

public void init()

{

canvas = new MyCanvas();

inputR = new TextField(6);

inputX = new TextField(6);

inputY = new TextField(6);

inputN = new TextField(6);

b1 = new Button("确定");

b1.addActionListener(this);

label1 = new Label("输入位置坐标:");

label2 = new Label("输入半径:");

label3 = new Label("输入要打印java代码做个圆圈的*数:");

add(label1);

add(inputX);

add(inputY);

add(label2);

add(inputR);

add(label3);

add(inputN);

add(b1);

add(canvas);

}

public void actionPerformed(ActionEvent e)

{

int x=0,y=0,n=0,r=0;

try

{

x=Integer.valueOf(inputX.getText()).intValue();

y=Integer.valueOf(inputY.getText()).intValue();

n=Integer.valueOf(inputN.getText()).intValue();

r=Integer.valueOf(inputR.getText()).intValue();

canvas.setX(x);

canvas.setY(y);

canvas.setR(r);

canvas.setN(n);

canvas.repaint();

}

catch(NumberFormatException ee)

{

x = 0;

y = 0;

r = 0;

n = 0;

}

}

}

public void draw(Graphics2D g) {

g.setColor(color);//设置颜色

g.setStroke(stroke);／／宽度

int x, y, w, h;

if (startX endX) {／／以下java代码做个圆圈的startx 、endx都是由鼠标拖 动事件得到

x = endX;

w = startX - endX;

} else {

x = startX;

w = endX - startX;

}

if (startY endY) {

y = endY;

h = startY - endY;

} else {

y = startY;

h = endY - startY;

}

g.drawOval(x, y, w, h);

}

相关问答

Q1: java编程:定义一个圆circle类,包含如下内容

代码如下：

import java.util.Scanner;

class Circle {

private double radius;

public Circle(double radius) {

this.radius = radius;

}

public double getRadius() {

return radius;

}

public void setRadius(double radius) {

this.radius = radius;

}

public double getArea() {

return Math.PI * radius * radius;

}

public double getPerimeter() {

return 2 * Math.PI * radius;

}

}

public class App {

public static void main(String[] argv) {

Scanner scanner = new Scanner(System.in);

System.out.print("请输入圆半径：");

double r = scanner.nextDouble();

Circle c = new Circle(r);

System.out.println("面积：" + c.getArea() + "，周长：" + c.getPerimeter());

}

}

运行结果：

Q2: 急求Java代码，定义一个Circle(圆类型）

public class Exam

{

public static void main(String[] args)

{

Circle c=new Circle(3,4,5);

System.out.printf("圆心java代码做个圆圈：(%f,%f)java代码做个圆圈，半径：%f，面积：%f",c.x,c.y,c.r,c.countArea());

}

}

class Circle

{

public Circle()

{

this(0,0,0);

}

public Circle(double x,double y,double r)

{

this.x=x;

this.y=y;

this.r=r;

}

public double countArea()

{

return Math.PI*r*r;

}

/*private*/public double x,y,r;

}

Q3: 用JAVA编写圆

代码如下：

import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import javax.swing.JFrame; import javax.swing.JPanel; public class TestSw extends JFrame { public static void main(String[] args) { new TestSw(); } public TestSw(){ super("Test"); this.setSize(new Dimension(400,300)); this.setContentPane(new Mypane()); this.setVisible(true); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } class Mypane extends JPanel{ public void paint(Graphics g) { super.paint(g); g.setColor(Color.red); g.setXORMode(Color.white); g.drawArc(20, 20, 100, 100, 0, 360); ///此方法将画一个直径100的圆.红色. } } }

Q4: JAVA画圆

import java.awt.Frame;

import java.awt.Graphics;

public class S extends Frame{

private int x;

private int y;

private boolean drawOval;//为true时绘制

//测试入口函数

public static void main(String []args)

{

new S().print();

}

//构造函数,初始化x、y坐标，设置drawOval变量为false，设置窗体大小

public S()

{

x = 200;

y = 200;

drawOval = false;

this.setSize(400,400);

this.setVisible(true);

}

public void print(){

//在调用S类实例的print方法时,画一个以属性X,Y为起点的宽高为10的圆.

drawOval = true; //设置drawOval变量为true

repaint(); //调用刷新画面方法

}

public void paint(Graphics g)

{

//为true时绘制

if(drawOval)g.fillOval(x,y,10,10);

}

}

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