如何用java代码画圈 java中画圆的方法

Java中画圈是哪个函数

使用drawOval来画圆圈, 

g.drawOval(x, y, w, h); x,y表示圆所在的位置.w ,h 表示圆的宽高,当宽高不一致是就是椭圆

实例

import java.awt.Color;

import java.awt.Graphics;

import javax.swing.JFrame;

public class SwingDemo extends JFrame{

public SwingDemo() {

setTitle("窗口");

        setSize(280, 180);

        setLocationRelativeTo(null);

        setDefaultCloseOperation(EXIT_ON_CLOSE);

        setVisible(true);

}

public static void main(String[] args) {

new SwingDemo();

}

@Override

public void paint(Graphics g) {

super.paint(g);

g.setColor(Color.RED);

g.drawOval(150, 100, 30, 20);//画椭圆

g.setColor(Color.BLUE);

g.drawOval(100, 50,60, 60);//画圆

}

}

显示

相关问答

Q1: 在JAVA 中用 2维数组画圈

呵呵如何用java代码画圈，挺有趣如何用java代码画圈的阿。。还有这种问题。写一下。

大致如何用java代码画圈的思路是如何用java代码画圈，首先将数组构造出来如何用java代码画圈，然后再依次打印。

public class Test

{

final int LEFT_TO_RIGHT = 1 ;

final int TOP_TO_BOTTOM = 2 ;

final int RIGHT_TO_LEFT = 3 ;

final int BOTTOM_TO_TOP = 4 ;

static int [] DIRECTIONS = new int [] {

LEFT_TO_RIGHT,

TOP_TO_BOTTOM,

RIGHT_TO_LEFT,

BOTTOM_TO_TOP

} ;

int dIndex = 0 ;

int row = 0 ;

int col = 0 ;

public int [][] fillMap (int cols , int rows)

{

int [][] map = new int [rows][cols] ;

row = 0 ;

col = 0 ;

for (int i = 1 ; i = rows*cols ; i ++)

{

fillPoint (i) ;

}

}

public void fillPoint (int num)

{

map [row][col] == num ;

// try move to next

int nextRow, nextCol;

for (int i = 0 ; i 4 ; i ++)

{

d = (d + i) % 4 ;

int [] point = moveNext (d) ;

nextRow = point [0] ;

nextCol = point [1] ;

if (nextRow = 0 nextRow map.length

nextCol = 0 nextCol map [row].length

map [row][col] == 0)

{

row = nextRow ;

col = nextCol ;

return ;

}

}

// test is vilid

// throw new RuntimeException ("Unknow error: can't move to next position.") ;

System.out.println ("No room..") ;

}

private int [] moveNext (int d)

{

int nextRow, nextCol;

switch (d)

{

case LEFT_TO_RIGHT :

nextCol = col + 1 ;

nextRow = row ;

break ;

case TOP_TO_BOTTOM :

nextRow = row + 1 ;

nextCol = col ;

break ;

case RIGHT_TO_LEFT :

nextRow = row ;

nextCol = col - 1 ;

break ;

case BOTTOM_TO_TOP :

nextRow = row - 1 ;

nextCol = col ;

break ;

default :

printException

}

return new int [] {nextRow, nextCol} ;

}

public static void main (String argv [])

{

Test t = new Test () ;

int [][] map = t.fillMap [10][10] ;

for (int i = 0 ; i 10 ; i ++)

{

for (int j = 0 ; j 10 ; j ++)

{

System.out.print (map [i][j]) ;

System.out.print ("\t") ;

}

System.out.println () ;

}

}

}

Q2: java 如何用两个循环画圆

其实就是遍历每一个点如何用java代码画圈，如果在圆形上，则输出#，不在圆形上，则输出空格。

代码如下如何用java代码画圈：

float x = 14;

float y = 8;

float r = 5;

for (int i = 0; i 20; i++) {

for (int j = 0; j 20; j++) {

float result = (i - x) * (i - x) + (j - y) * (j - y) - r * r; // 圆心公式

if (result 5 result -5) { // 5 为精度范围

System.out.print("#");

} else {

System.out.print(" ");

}

}

System.out.println("");

}

Q3: 怎样用Java用鼠标点击 画圈

import java.awt.Color;

import java.awt.Graphics;

import java.awt.Point;

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

import java.awt.event.MouseMotionListener;

import javax.swing.JComponent;

import javax.swing.JFrame;

/*

* @(#)Sanke.java.java Test 2012-2-29

* Copyright (c) 2010-2020 Easy ITs, Inc. All rights reserved.

*/

/**

*/

public class Sanke extends JFrame {

Cavas cavas = new Cavas();

public Sanke() {

this.setSize(500, 400);

this.setBackground(Color.black);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.add(cavas);

cavas.addMouseListener(cavas);

cavas.addMouseMotionListener(cavas);

this.setVisible(true);

}

public static void main(String[] args) {

new Sanke();

}

}

class Cavas extends JComponent implements MouseListener, MouseMotionListener {

private Point begin;

private Point end;

@Override

protected void paintComponent(Graphics g) {

super.paintComponent(g);

if (begin != null end != null) {

int left = Math.min(begin.x, end.x);

int top = Math.min(begin.y, end.y);

int width = Math.abs(begin.x - end.x);

int height = Math.abs(begin.y - end.y);

int r = Math.min(width, height);

// 画圆

g.drawOval(left, top, r,r);

// 画楕圆

// g.drawOval(left, top, width,height);

}

}

@Override

public void mouseDragged(MouseEvent e) {

end = e.getPoint();

repaint();

}

@Override

public void mouseMoved(MouseEvent e) {

}

@Override

public void mouseClicked(MouseEvent e) {

}

@Override

public void mousePressed(MouseEvent e) {

begin = e.getPoint();

}

@Override

public void mouseReleased(MouseEvent e) {

}

@Override

public void mouseEntered(MouseEvent e) {

}

@Override

public void mouseExited(MouseEvent e) {

}

}

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