189 8069 5689
import java.awt.*;
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import java.awt.event.*;
import java.awt.geom.Ellipse2D;
import javax.swing.*;
public class DrawCircle extends JFrame{
Ellipse2D circle;
public DrawCircle(){
super("Moving Circle");
circle = new Ellipse2D.Double(200,200,100,100);
this.addKeyListener(new myKeyListener(this));
this.setSize(500,500);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}
public void paint(Graphics g){
Graphics2D g2 = (Graphics2D) g;
g2.setColor(Color.white);
g2.fillRect(0,0,this.getWidth(),this.getHeight());
g2.setColor(Color.blue);
g2.fill(circle);
}
public static void main(String args[]){
DrawCircle d = new DrawCircle();
}
class myKeyListener extends KeyAdapter{
JFrame frame;
public myKeyListener(JFrame frame){
this.frame = frame;
}
public void keyPressed(KeyEvent e){
switch(e.getKeyCode()){
case KeyEvent.VK_UP:
circle.setFrame(circle.getX(),circle.getY()-10,circle.getHeight(),circle.getWidth());
break;
case KeyEvent.VK_DOWN:
circle.setFrame(circle.getX(),circle.getY()+10,circle.getHeight(),circle.getWidth());
break;
case KeyEvent.VK_LEFT:
circle.setFrame(circle.getX()-10,circle.getY(),circle.getHeight(),circle.getWidth());
break;
case KeyEvent.VK_RIGHT:
circle.setFrame(circle.getX()+10,circle.getY(),circle.getHeight(),circle.getWidth());
break;
}
frame.repaint();
}
}
}
辛辛苦苦给你做的... 不是复制的哈...
下面是用 Java 语言画一个红底五角星的代码示例：
import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics;
import javax.swing.JFrame; import javax.swing.JPanel;
public class FivePointedStar {
public static void main(String[] args) {
JFrame frame = new JFrame("Five Pointed Star");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
FivePointedStarPanel panel = new FivePointedStarPanel();
frame.add(panel);
frame.pack();
frame.setVisible(true);
}
}
class FivePointedStarPanel extends JPanel {
public FivePointedStarPanel() {
setPreferredSize(new Dimension(300, 300));
setBackground(Color.WHITE);
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
int xPoints[] = {150, 200, 250, 225, 175, 125, 100, 125};
int yPoints[] = {100, 50, 100, 150, 150, 100, 50, 100};
int nPoints = 8; g.setColor(Color.RED);
g.fillPolygon(xPoints, yPoints, nPoints); }
}
这段代码中，我们创建了一个 JFrame 窗口，并在窗口中添加了一个 JPanel 面板。在面板中，我们重写了 paintComponent 方法，使用 Graphics 类的 fillPolygon 方法画出了一个五角星。我们设置了五角星的颜色为红色，并设置了面板的背景色为白色。
运行这段代码后，将会弹出一个窗口，显示一个红底五角星。
希望这个示例能帮助你画出一个红底五角星。
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import javax.swing.*;
//不规则图形的绘制
public class IrregularShapeDemo extends JFrame {
GeneralPath gPath= new GeneralPath(); //GeneralPath对象实例
Point aPoint;
//构造函数
public IrregularShapeDemo() {
super("不规则图形的绘制"); //调用父类构造函数
enableEvents(AWTEvent.MOUSE_EVENT_MASK|AWTEvent.MOUSE_MOTION_EVENT_MASK); //允许事件
setSize(300, 200); //设置窗口尺寸
setVisible(true); //设置窗口可视
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //关闭窗口时退出程序
}
public void paint(Graphics g) { //重载窗口组件的paint()方法
Graphics2D g2D = (Graphics2D)g; //获取图形环境
g2D.draw(gPath); //绘制路径
}
public static void main(String[] args) {
new IrregularShapeDemo();
}
protected void processMouseEvent(MouseEvent e) { //鼠标事件处理
if(e.getID() == MouseEvent.MOUSE_PRESSED) {
aPoint = e.getPoint(); //得到当前鼠标点
gPath = new GeneralPath(); //重新实例化GeneralPath对象
gPath.moveTo(aPoint.x,aPoint.y); //设置路径点
}
}
protected void processMouseMotionEvent(MouseEvent e) { //鼠标运动事件处理
if(e.getID() == MouseEvent.MOUSE_DRAGGED) {
aPoint = e.getPoint(); //得到当前鼠标点
gPath.lineTo(aPoint.x, aPoint.y); //设置路径
gPath.moveTo(aPoint.x, aPoint.y);
repaint(); //重绘组件
}
}
}
下面是我以前做的小程序，希望能给你点帮助！
package menu;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class DaYin extends JFrame implements ActionListener{
public DaYin() {
Container c=this.getContentPane();
c.setLayout(new BorderLayout());
JMenuBar jmb=new JMenuBar();
JMenu jm=null;
jm=new JMenu("文件");
jmb.add(jm);
jm=new JMenu("编辑");
jmb.add(jm);
jm=new JMenu("打印");
JMenuItem jmi=new JMenuItem("打印预览");
jmi.addActionListener(this);
jm.add(jmi);
jmb.add(jm);
jm=new JMenu("帮助");
jmb.add(jm);
this.setJMenuBar(jmb);
this.setSize(1024,768);
this.setVisible(true);
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
}
public static void main(String[] args) {
new DaYin();
}
public void update(Graphics g){
g.setColor(Color.black);
String title[]={"摘要","科目","子目或户名","借方金额","贷方金额"};
String danwei[]={"千","百","十","万","千","百","十","元","角","分"};
int csx=200;//打印x的初始坐标
int csy=200;//打印y的初始坐标
int x=csx;
int y=csy;
int a=x+20;//打印字体x的初始坐标
int b=y+20;//打印字体y的初始坐标
int row=7;//一共打印出几条横线
int cul=5;//一共打印出几条竖线
int hangju=30;//线与线之间的纵向间距
int lieju=100;//线与线之间的横向间距
int yy=hangju*row+y;
int c=yy+20;
g.setFont(new Font("行楷",Font.TYPE1_FONT,24));
g.drawString("记 账 凭 证", x+160, y-40);//打印出记账凭证这几个字
g.drawLine(x+100, y-30, x+340, y-30);//打印出记账凭证下面的那条线
g.setFont(new Font("行楷",Font.TYPE1_FONT,13));
g.drawString("年 月 日 第_______号", x+260, y-10);
//g.drawLine(x+430, y-10, x+470, y-10);
for(int i=0;i=row;i++){
g.drawLine(x, y, cul*lieju+x+25, y);//此循环用于画出表格的行
if(i==0)
y+=hangju*2;
else
y+=hangju;
}
y=csy;
g.drawLine(x+lieju*3, y+hangju, cul*lieju+x, y+hangju);//打印出第一行半的横线
for(int j=0;j=cul;j++){
g.drawLine(x, y, x, row*hangju+y);//此循环用于画出表格的列
x+=lieju;
}
x=csx;
for(int z=0;zcul;z++){
g.setColor(Color.red);//设置颜色
g.setFont(new Font("",Font.TYPE1_FONT,13));//设置表头字体
if(z3)
g.drawString(title[z], a, b+hangju/2);
else
g.drawString(title[z], a, b);//为表格添加表头
a+=lieju;
}//76-89打印出一个表格形状
int xx=lieju*3+x+10;
for(int v=0;v=9;v++){
g.drawLine(xx, y+hangju, xx, row*hangju+y+hangju);//此循环用于画出表格的列
g.setFont(new Font("",Font.TYPE1_FONT,11));
g.drawString(danwei[v], xx-10, y+hangju+20);//为表格添加表头
if(v%2==0)
g.setColor(Color.red);//设置颜色
else
g.setColor(Color.BLUE);//设置颜色
xx+=10;
}
for(int n=0;n9;n++){
g.drawLine(xx, y+hangju, xx, row*hangju+y+hangju);//此循环用于画出表格的列
g.drawString(danwei[n],xx-10, y+hangju+20);//为表格添加表头
if(n%2==0)
g.setColor(Color.red);//设置颜色
else
g.setColor(Color.BLUE);//设置颜色
xx+=10;
}
g.drawString(danwei[9],xx-10, y+hangju+20);
g.setColor(Color.black);//设置颜色
for(int i=0;i=1;i++){
g.drawLine(x,yy , cul*lieju+x, yy);//此循环用于画出表格的行
yy+=hangju;
}
yy=hangju*row+y;
for(int j=0;j=3;j++){
g.drawLine(x, yy, x, (row+1)*hangju+y);//此循环用于画出表格的列
if(j0){
x+=lieju;
}else{
x+=lieju*3;
}
}//112-128打印出表格的最后一行单元格
x=csx;
g.setFont(new Font("",Font.TYPE1_FONT,13));
g.drawString("合 计",x+60, c);
g.drawString("会计主管 记账 出纳 审核 制证", x+30, yy+50);
g.drawLine(cul*lieju+x+25, y, cul*lieju+x+25, (row+1)*hangju+y);//打印出最后一列
g.drawString("记",cul*lieju+x+6, y+15);
g.drawString("账", cul*lieju+x+6, y+35);
g.drawString("√", cul*lieju+x+6, y+55);//134-136为最后一列写入字体
g.drawString("附",cul*lieju+x+35, y+75);
g.drawString("件", cul*lieju+x+35, y+95);
g.drawString("张", cul*lieju+x+35, y+175);//134-136为最后一列后写入字体
}
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
if(e.getActionCommand().equals("打印预览")){
this.repaint();
}
}
}
使用drawLine()做了一个记账凭证。
执行点击"打印"子菜单"打印预览"就可显示出我们所画的"记账凭证表"
希望这个小程序能够给你点灵感
找到了，很久以前写的一个简单画图，呵呵～当时要求用AWT写，很难受。
package net.miqiang.gui;
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Label;
import java.awt.Panel;
import java.awt.RenderingHints;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
/**
* 简单画图板程序
* 好久没用 AWT 了，写起来真别扭，如果用 swing 会很舒服，有空再改写吧。
*
* @author 米强
*
*/
public class TestMain extends Frame {
// 画板
private Palette palette = null;
// 显示当前颜色的面板
private Panel nonceColor = null;
// 画笔粗细
private Label drawWidth = null;
// 画笔端点的装饰
private Label drawCap = null;
// 选取颜色按钮的监听事件类
private ButtonColorAction buttonColorAction = null;
// 鼠标进入按钮后光标样式的监听事件类
private ButtonCursor buttonCursor = null;
// 画笔样式的监听事件
private ButtonStrokeAction buttonStrokeAction = null;
/**
* 构造方法
*
*/
public TestMain() {
// 设置标题栏文字
super("简易画图板");
// 构造一个画图板
palette = new Palette();
Panel pane = new Panel(new GridLayout(2, 1));
// 画笔颜色选择器
Panel paneColor = new Panel(new GridLayout(1, 13));
// 12 个颜色选择按钮
Button [] buttonColor = new Button[12];
Color [] color = {Color.black, Color.blue, Color.cyan, Color.darkGray, Color.gray, Color.green, Color.magenta, Color.orange, Color.pink, Color.red, Color.white, Color.yellow};
// 显示当前颜色的面板
nonceColor = new Panel();
nonceColor.setBackground(Color.black);
paneColor.add(nonceColor);
buttonColorAction = new ButtonColorAction();
buttonCursor = new ButtonCursor();
for(int i = 0; i buttonColor.length; i++){
buttonColor[i] = new Button();
buttonColor[i].setBackground(color[i]);
buttonColor[i].addActionListener(buttonColorAction);
buttonColor[i].addMouseListener(buttonCursor);
paneColor.add(buttonColor[i]);
}
pane.add(paneColor);
// 画笔颜色选择器
Panel paneStroke = new Panel(new GridLayout(1, 13));
// 控制画笔样式
buttonStrokeAction = new ButtonStrokeAction();
Button [] buttonStroke = new Button[11];
buttonStroke[0] = new Button("1");
buttonStroke[1] = new Button("3");
buttonStroke[2] = new Button("5");
buttonStroke[3] = new Button("7");
buttonStroke[4] = new Button("9");
buttonStroke[5] = new Button("11");
buttonStroke[6] = new Button("13");
buttonStroke[7] = new Button("15");
buttonStroke[8] = new Button("17");
buttonStroke[9] = new Button("■");
buttonStroke[10] = new Button("●");
drawWidth = new Label("3", Label.CENTER);
drawCap = new Label("●", Label.CENTER);
drawWidth.setBackground(Color.lightGray);
drawCap.setBackground(Color.lightGray);
paneStroke.add(drawWidth);
for(int i = 0; i buttonStroke.length; i++){
paneStroke.add(buttonStroke[i]);
buttonStroke[i].addMouseListener(buttonCursor);
buttonStroke[i].addActionListener(buttonStrokeAction);
if(i = 8){
buttonStroke[i].setName("width");
}else{
buttonStroke[i].setName("cap");
}
if(i == 8){
paneStroke.add(drawCap);
}
}
pane.add(paneStroke);
// 将画笔颜色选择器添加到窗体中
this.add(pane, BorderLayout.NORTH);
// 将画图板添加到窗体中
this.add(palette);
// 添加窗口监听，点击关闭按钮时退出程序
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
// 设置窗体 ICON 图标
this.setIconImage(Toolkit.getDefaultToolkit().createImage("images/palette.png"));
// 设置窗口的大小
this.setSize(new Dimension(400, 430));
// 设置窗口位置，处于屏幕正中央
this.setLocationRelativeTo(null);
// 显示窗口
this.setVisible(true);
}
/**
* 程序入口
*
* @param args
* 字符串数组参数
*/
public static void main(String[] args) {
new TestMain();
}
/**
* 选取颜色按钮的监听事件类
* @author 米强
*
*/
class ButtonColorAction implements ActionListener {
public void actionPerformed(ActionEvent e) {
Color color_temp = ((Button)e.getSource()).getBackground();
nonceColor.setBackground(color_temp);
palette.setColor(color_temp);
}
}
/**
* 鼠标进入按钮变换光标样式监听事件类
* @author 米强
*
*/
class ButtonCursor extends MouseAdapter {
public void mouseEntered(MouseEvent e) {
((Button)e.getSource()).setCursor(new Cursor(Cursor.HAND_CURSOR));
}
public void mouseExited(MouseEvent e) {
((Button)e.getSource()).setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
}
}
/**
* 设置画笔的监听事件类
* @author 米强
*
*/
class ButtonStrokeAction implements ActionListener {
public void actionPerformed(ActionEvent e) {
Button button_temp = (Button) e.getSource();
String name = button_temp.getName();
if(name.equalsIgnoreCase("width")){
drawWidth.setText(button_temp.getLabel());
palette.setStroke(Float.parseFloat(button_temp.getLabel()));
}else if(name.equalsIgnoreCase("cap")){
drawCap.setText(button_temp.getLabel());
if(button_temp.getLabel().equals("■")){
palette.setStroke(BasicStroke.CAP_SQUARE);
}else if(button_temp.getLabel().equals("●")){
palette.setStroke(BasicStroke.CAP_ROUND);
}
}
}
}
}
/**
* 画板类
*
* @author 米强
*
*/
class Palette extends Panel implements MouseListener, MouseMotionListener {
// 鼠标 X 坐标的位置
private int mouseX = 0;
// 上一次 X 坐标位置
private int oldMouseX = 0;
// 鼠标 Y 坐标的位置
private int mouseY = 0;
// 上一次 Y 坐标位置
private int oldMouseY = 0;
// 画图颜色
private Color color = null;
// 画笔样式
private BasicStroke stroke = null;
// 缓存图形
private BufferedImage image = null;
/**
* 构造一个画板类
*
*/
public Palette() {
this.addMouseListener(this);
this.addMouseMotionListener(this);
// 默认黑色画笔
color = new Color(0, 0, 0);
// 设置默认画笔样式
stroke = new BasicStroke(3.0f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
// 建立 1280 * 1024 的 RGB 缓存图象
image = new BufferedImage(1280, 1024, BufferedImage.TYPE_INT_RGB);
// 设置颜色
image.getGraphics().setColor(Color.white);
// 画背景
image.getGraphics().fillRect(0, 0, 1280, 1024);
}
/**
* 重写 paint 绘图方法
*/
public void paint(Graphics g) {
super.paint(g);
// 转换为 Graphics2D
Graphics2D g2d = (Graphics2D) g;
// 获取缓存图形 Graphics2D
Graphics2D bg = image.createGraphics();
// 图形抗锯齿
bg.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
// 设置绘图颜色
bg.setColor(color);
// 设置画笔样式
bg.setStroke(stroke);
// 画线，从上一个点到新的点
bg.drawLine(oldMouseX, oldMouseY, mouseX, mouseY);
// 将缓存中的图形画到画板上
g2d.drawImage(image, 0, 0, this);
}
/**
* 重写 update 方法
*/
public void update(Graphics g) {
this.paint(g);
}
/**
* @return stroke
*/
public BasicStroke getStroke() {
return stroke;
}
/**
* @param stroke 要设置的 stroke
*/
public void setStroke(BasicStroke stroke) {
this.stroke = stroke;
}
/**
* 设置画笔粗细
* @param width
*/
public void setStroke(float width) {
this.stroke = new BasicStroke(width, stroke.getEndCap(), stroke.getLineJoin());
}
/**
* 设置画笔端点的装饰
* @param cap 参考 java.awt.BasicStroke 类静态字段
*/
public void setStroke(int cap) {
this.stroke = new BasicStroke(stroke.getLineWidth(), cap, stroke.getLineJoin());
}
/**
* @return color
*/
public Color getColor() {
return color;
}
/**
* @param color 要设置的 color
*/
public void setColor(Color color) {
this.color = color;
}
public void mouseClicked(MouseEvent mouseEvent) {
}
/**
* 鼠标按下
*/
public void mousePressed(MouseEvent mouseEvent) {
this.oldMouseX = this.mouseX = mouseEvent.getX();
this.oldMouseY = this.mouseY = mouseEvent.getY();
repaint();
}
public void mouseReleased(MouseEvent mouseEvent) {
}
/**
* 鼠标进入棋盘
*/
public void mouseEntered(MouseEvent mouseEvent) {
this.setCursor(new Cursor(Cursor.CROSSHAIR_CURSOR));
}
/**
* 鼠标退出棋盘
*/
public void mouseExited(MouseEvent mouseEvent) {
this.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
}
/**
* 鼠标拖动
*/
public void mouseDragged(MouseEvent mouseEvent) {
this.oldMouseX = this.mouseX;
this.oldMouseY = this.mouseY;
this.mouseX = mouseEvent.getX();
this.mouseY = mouseEvent.getY();
repaint();
}
public void mouseMoved(MouseEvent mouseEvent) {
}
}
我基于你原来画图的方法，添加了事件触发的命令b[j].setActionCommand("b" + j);否则你不能在事件响应处理的方法中使用e.getActionCommand()，而且字符串的比较用equals方法比较好。现在可以运行了，你可以看一下：
import java.applet.Applet;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class drawing extends Applet implements ActionListener {
Button b[] = new Button[5];
String fontname = "仿宋_GB2312";
int style = Font.PLAIN;
int size = 24;
int index = 0;
Font myfont;
public void init() {
setSize(700,700);
myfont = new Font(fontname, style, size);
b[0] = new Button("扇形");
b[1] = new Button("圆形");
b[2] = new Button("三角形");
b[3] = new Button("长方形");
b[4] = new Button("椭圆形");
for (int j = 0; j b.length; j++) {
b[j].setBounds(10, 10, 50, 20);
b[j].addActionListener(this);
b[j].setActionCommand("b" + j);
add(b[j]);
}
}
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("b0")) {
index = 0;
repaint();
}
if (e.getActionCommand().equals("b1")) {
index = 1;
repaint();
}
if (e.getActionCommand().equals("b2")) {
index = 2;
repaint();
}
if (e.getActionCommand().equals("b3")) {
index = 3;
repaint();
}
if (e.getActionCommand().equals("b4")) {
index = 4;
repaint();
}
}
public void paint(Graphics g) {
switch (index) {
case 0:
g.fillArc(0, 60, 80, 60, 30, 120);
break;
case 1:
g.drawOval( 300, 50, 60, 60);
break;
case 2:
Polygon filledPolygon = new Polygon();
filledPolygon.addPoint(380, 50);
filledPolygon.addPoint(380, 110);
filledPolygon.addPoint(450, 90);
g.drawPolygon(filledPolygon);
break;
case 3:
g.drawRect( 200, 50, 80, 60);
break;
case 4:
g.drawOval(100, 50, 80, 60);
break;
default:
g.fillArc(0, 60, 80, 60, 30, 120);
break;
}
}
/*
* public void paint(Graphics g) { g.fillArc( 0, 60, 80, 60, 30, 120);
* //绘制扇形 g.drawOval( 100, 50, 80, 60); g.drawRect( 200, 50, 80, 60);
* g.drawOval( 300, 50, 60, 60); Polygon filledPolygon=new Polygon();
* filledPolygon.addPoint(380,50); filledPolygon.addPoint(380,110);
* filledPolygon.addPoint(450,90); g.drawPolygon(filledPolygon); }
*/
}