用JAVA制作一个画图程序

在日常生活中画图软件给我们带来了许多便利，往大了说可以用它来制作图标，往小了说也可以当做一个涂鸦板消磨时间。
比如：制作个图标

用来画画：

这个画图程序界面如上，这个程序的功能如下：
1.可更改的画笔粗细（1.细线 2.较粗线 3.粗线），效果如下：
1. 更改背景颜色：
  
  3.更改画笔颜色：
  
  4.清除功能：
  
  5.橡皮涂擦功能：
  
  6.添加图片水印：
  
  我们该如何制作这个软件呢？代码如下：

1. 首先，创建一个DrawPirtureFrame类：

package com.tcz.draw;import javax.swing.ButtonGroup;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JColorChooser;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JToggleButton;
import javax.swing.JToolBar;import java.awt.color.*;
import java.awt.AlphaComposite;
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.event.MouseMotionListener;public class DrawPictureFrame extends JFrame {BufferedImage image = new BufferedImage(1160, 830, BufferedImage.TYPE_INT_BGR);Graphics gs = image.getGraphics();Graphics2D g = (Graphics2D) gs;DrawPictureCanvas canvas = new DrawPictureCanvas();Color forecColor = Color.black;Color backgroundColor = Color.white;int x = -1;int y = -1;boolean rubber = false;/** 创建按钮，菜单组件*/private JToolBar toolBar;private JButton eraserButton;private JToggleButton strokeButton1;private JToggleButton strokeButton2;private JToggleButton strokeButton3;private JButton backgroundButton;private JButton foreroundButton;private JButton clearButton;private JButton savebButton;private JButton shapeButton;private JMenuItem strokeMenuItem1;private JMenuItem strokeMenuItem2;private JMenuItem strokeMenuItem3;private JMenuItem clearMenuItem;private JMenuItem foregroundMenuItem;private JMenuItem backgroundItem;private JMenuItem eraserMenuItem;private JMenuItem exitMenuItem;private JMenuItem saveMenuItem;private String shuiyin = "";private JMenuItem shuiyinMenuItem;public DrawPictureFrame() {setResizable(false);//设为不可更改大小setTitle("画图程序(水印内容：[" + shuiyin + "])");setDefaultCloseOperation(EXIT_ON_CLOSE);setBounds(500, 100, 1160, 920);init();addListener();}private void init() {g.setColor(backgroundColor);g.fillRect(0, 0, 1160, 830);g.setColor(forecColor);canvas.setImage(image);getContentPane().add(canvas);toolBar = new JToolBar();getContentPane().add(toolBar, BorderLayout.NORTH);//将工具栏放在窗体上边/** 设置各组件位置*/savebButton = new JButton("保存");savebButton.setToolTipText("保存");toolBar.add(savebButton);toolBar.addSeparator();strokeButton1 = new JToggleButton("细线");strokeButton1.setSelected(true);toolBar.add(strokeButton1);strokeButton2 = new JToggleButton("较粗线");toolBar.add(strokeButton2);strokeButton3 = new JToggleButton("粗线");ButtonGroup strokeGroup = new ButtonGroup();strokeGroup.add(strokeButton1);strokeGroup.add(strokeButton2);strokeGroup.add(strokeButton3);toolBar.add(strokeButton3);toolBar.addSeparator();backgroundButton = new JButton("背景颜色");toolBar.add(backgroundButton);foreroundButton = new JButton("画笔颜色");toolBar.add(foreroundButton);toolBar.addSeparator();clearButton = new JButton("清除");toolBar.add(clearButton);eraserButton = new JButton("橡皮");toolBar.add(eraserButton);JMenuBar menuBar = new JMenuBar();setJMenuBar(menuBar);JMenu systemMenu = new JMenu("系统");menuBar.add(systemMenu);shuiyinMenuItem = new JMenuItem("水印");systemMenu.add(shuiyinMenuItem);saveMenuItem = new JMenuItem("保存");systemMenu.add(saveMenuItem);systemMenu.addSeparator();exitMenuItem = new JMenuItem("退出");systemMenu.add(exitMenuItem);JMenu strokeMenu = new JMenu("线型");menuBar.add(strokeMenu);strokeMenuItem1 = new JMenuItem("细线");strokeMenu.add(strokeMenuItem1);strokeMenuItem2 = new JMenuItem("较粗线");strokeMenu.add(strokeMenuItem2);strokeMenuItem3 = new JMenuItem("粗线");strokeMenu.add(strokeMenuItem3);JMenu colorMenu = new JMenu("颜色");menuBar.add(colorMenu);foregroundMenuItem = new JMenuItem("前景颜色");colorMenu.add(foregroundMenuItem);backgroundItem = new JMenuItem("背景颜色");colorMenu.add(backgroundItem);JMenu editMenu = new JMenu("编辑");menuBar.add(editMenu);clearMenuItem = new JMenuItem("清除");editMenu.add(clearMenuItem);eraserMenuItem = new JMenuItem("橡皮");editMenu.add(eraserMenuItem);}private void addListener() {canvas.addMouseMotionListener(new MouseMotionAdapter() {public void mouseDragged(final MouseEvent e) {if (x > 0 && y > 0) {if (rubber) {g.setColor(backgroundColor);g.fillRect(x, y, 20, 20);} else {g.drawLine(x, y, e.getX(), e.getY());}}x = e.getX();y = e.getY();canvas.repaint();}@Overridepublic void mouseMoved(MouseEvent e) {if (rubber) {Toolkit kit = Toolkit.getDefaultToolkit();setCursor(DEFAULT_CURSOR);//设置鼠标显示样式} else {setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));}}});canvas.addMouseListener(new MouseAdapter() {public void mouseReleased(final MouseEvent arg0) {x = -1;y = -1;}});strokeButton1.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {BasicStroke bs = new BasicStroke(1, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER);g.setStroke(bs);}});strokeButton2.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {BasicStroke bs = new BasicStroke(2, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER);g.setStroke(bs);}});strokeButton3.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {BasicStroke bs = new BasicStroke(4, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER);g.setStroke(bs);}});backgroundButton.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {Color bgColor = JColorChooser.showDialog(DrawPictureFrame.this, "选择颜色对话框", Color.CYAN);if (bgColor != null) {backgroundColor = bgColor;}backgroundButton.setBackground(backgroundColor);g.setColor(backgroundColor);g.fillRect(0, 0, 1160, 830);g.setColor(forecColor);canvas.repaint();}});foreroundButton.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {Color fColor = JColorChooser.showDialog(DrawPictureFrame.this, "选择颜色对话框", Color.CYAN);if (fColor != null) {forecColor = fColor;}foreroundButton.setBackground(forecColor);g.setColor(forecColor);}});clearButton.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {g.setColor(backgroundColor);g.fillRect(0, 0, 1160, 830);g.setColor(forecColor);canvas.repaint();}});eraserButton.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {if (eraserButton.getText().equals("橡皮")) {rubber = true;eraserMenuItem.setText("画图");eraserButton.setText("画图");} else {rubber = false;eraserMenuItem.setText("橡皮");eraserButton.setText("橡皮");g.setColor(forecColor);}}});savebButton.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {addWatermark();}});// 细线菜单项strokeMenuItem1.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {BasicStroke bs = new BasicStroke(1, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER);g.setStroke(bs);}});// 较粗线菜单项strokeMenuItem2.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {BasicStroke bs = new BasicStroke(2, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER);g.setStroke(bs);}});// 粗线菜单项strokeMenuItem3.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {BasicStroke bs = new BasicStroke(4, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER);g.setStroke(bs);}});foregroundMenuItem.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {Color fColor = JColorChooser.showDialog(DrawPictureFrame.this, "选择颜色对话框", Color.CYAN);if (fColor != null) {forecColor = fColor;}foreroundButton.setBackground(forecColor);g.setColor(forecColor);}});backgroundItem.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {Color bgColor = JColorChooser.showDialog(DrawPictureFrame.this, "选择颜色对话框", Color.CYAN);if (bgColor != null) {backgroundColor = bgColor;}backgroundButton.setBackground(backgroundColor);g.setColor(backgroundColor);g.fillRect(0, 0, 1160, 830);g.setColor(forecColor);canvas.repaint();}});clearMenuItem.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {g.setColor(backgroundColor);g.fillRect(0, 0, 1160, 830);g.setColor(forecColor);canvas.repaint();}});eraserMenuItem.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {if (eraserButton.getText().equals("橡皮")) {rubber = true;eraserButton.setText("画图");eraserMenuItem.setText("画图");} else {rubber = false;eraserButton.setText("橡皮");eraserMenuItem.setText("橡皮");g.setColor(forecColor);}}});exitMenuItem.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {System.exit(0);}});shuiyinMenuItem.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {shuiyin = JOptionPane.showInputDialog(DrawPictureFrame.this, "你想添加什么水印？");if (null == shuiyin) {shuiyin = "";} else {setTitle("画图程序(水印内容：[" + shuiyin + "])");}}});toolBar.addMouseMotionListener(new MouseMotionAdapter() {//工具栏添加鼠标事件监听@Overridepublic void mouseMoved(MouseEvent e) {setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));//设置鼠标的形状为默认光标}});}private void addWatermark() {if (!"".equals(shuiyin.trim())) {// 如果水印字段不是空字符串g.rotate(Math.toRadians(-30));Font font = new Font("楷体", Font.BOLD, 72);g.setFont(font);g.setColor(Color.GRAY);AlphaComposite alpha = AlphaComposite.SrcOver.derive(0.4f);// 设置透明效果g.setComposite(alpha);g.drawString(shuiyin, 350, 900);canvas.repaint();g.rotate(Math.toRadians(30));// 将旋转的图片再转回来alpha = AlphaComposite.SrcOver.derive(1f);// 不透明效果g.setComposite(alpha);// 使用不透明效果g.setColor(forecColor);// 画笔恢复之前的颜色}}public static void main(String[] args) {DrawPictureFrame frame = new DrawPictureFrame();frame.setVisible(true);}}

2.创建第二个类：

package com.tcz.draw;import java.awt.Canvas;
import java.awt.Graphics;
import java.awt.Image;public class DrawPictureCanvas extends Canvas{private Image image=null;public void setImage(Image image) {this.image=image;}@Overridepublic void paint(Graphics g) {g.drawImage(image, 0, 0, null);}public void update(Graphics g) {paint(g);}

心动不如行动，编写一个画图程序，体验绘画之美！更多有趣的功能等你来体验哦！

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