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Java实现简单小画板

Java制作简单画板，包括两个类，一个主要画板类Drawpad，一个画板监听器DrawListener类。
【Java实现简单小画板】1、Drawpad类，包括画板，画板功能设计，保存图片等

package Java课程设计; import java.awt.Graphics; import javax.imageio.ImageIO; import javax.print.DocFlavor.STRING; import javax.swing.ImageIcon; import javax.swing.JDialog; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JTextArea; import javax.swing.JTextField; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; import java.awt.AWTException; import java.awt.BasicStroke; import java.awt.BorderLayout; import java.awt.Color; import java.awt.Component; import java.awt.Container; import java.awt.Dimension; import java.awt.Font; import java.awt.Graphics2D; import java.awt.Rectangle; import java.awt.Robot; import java.awt.Shape; import java.awt.Window; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.image.BufferedImage; import java.awt.image.ColorModel; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.util.ArrayList; import javax.swing.JButton; import javax.swing.filechooser.FileNameExtensionFilter; public class Drawpad {static Color color1; public static void main(String[] args) {Drawpad dp = new Drawpad(); dp.initUI(); }//创建一个JFrame图形窗口public void initUI() {JFrame jf = new JFrame(); jf.setTitle("创意画图板(勿拖动)"); jf.setSize(1500,1000); jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //关闭时退出jf.setLocationRelativeTo(null); //居中，不用定位窗口大小//创建字体，之后所有的字体为该字体Font f=new Font("方正仿宋简体", Font.BOLD, 20); //创建画笔监听器DrawListenerdl = new DrawListener(); //创建读取图片BufferedImage(将图片加载到drawPanel面板中)和画笔g，画笔g为在保存图片上进行图画。BufferedImage bi = new BufferedImage(1300,800, BufferedImage.TYPE_INT_ARGB); Graphics2D g = bi.createGraphics(); //初始化时填充白色g.setColor(Color.WHITE); //先将图片填充为白色g.fillRect(0, 0, 1300,800); //设置增加菜单栏，包括保存和新建两个按钮JMenuBar box=new JMenuBar(); //在窗体上加菜单条,做一个菜单条,是菜单条，不是工具栏//创建menubtn1保存按钮，并加上监听器，以图片的形式保存绘画板上的内容JButton menubtn1=new JButton("保存"); //为保存按钮注册监听器menubtn1.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent arg0) {//创建文件保存窗口JFileChooser f=new JFileChooser("保存"); int returnVal = f.showSaveDialog(null); Filefile1=null; if(returnVal == JFileChooser.APPROVE_OPTION) {file1 =f.getSelectedFile(); String name = f.getName(file1); try {ImageIO.write(bi, "PNG", new File(f.getCurrentDirectory(),name+".png")); } catch (IOException e) {//需抛出异常// TODO Auto-generated catch blocke.printStackTrace(); }}}}); /*JButton menubtn2=new JButton("打开"); //为打开按钮注册监听器menubtn1.addActionListener(new ActionListener(){@Override//获取当前画笔粗细public void actionPerformed(ActionEvent arg0) {BufferedImage bimg = null; JFileChooser f=new JFileChooser("打开"); int returnVal = f.showOpenDialog(null); Filefile1=null; if(returnVal == JFileChooser.APPROVE_OPTION) {file1 =f.getSelectedFile(); String name = f.getName(file1); try {} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace(); }}}}); *///创建menubtn3退出按钮，并加上监听器，退出程序JButton menubtn3=new JButton("退出"); menubtn3.addActionListener(new ActionListener(){@Override//获取当前画笔粗细public void actionPerformed(ActionEvent arg0) {int ret=JOptionPane.showConfirmDialog(null, "你确定要退出吗", "确认退出", JOptionPane.YES_NO_OPTION); if(ret==JOptionPane.YES_OPTION){//“确认”退出程序System.exit(0); }}}); box.add(menubtn1); // box.add(menubtn2); box.add(menubtn3); //jf.setJMenuBar(box); jf.setJMenuBar(box); //jf用BorderLayout布局//北边,画板模式功能栏JPanel funcPanel=new JPanel(); jf.add(funcPanel,BorderLayout.NORTH); //中间,画布JPanel drawPanel=new JPanel(); jf.add(drawPanel,BorderLayout.CENTER); drawPanel.setPreferredSize(new Dimension(1000,700)); drawPanel.setBackground(dl.background); //一定要在画布上加上监听器!!1若画布没有加上监听器，无法显示drawPanel.addMouseListener(dl); drawPanel.addMouseMotionListener(dl); //南边,为画笔颜色选择按钮JPanel colorPanel=new JPanel(); jf.add(colorPanel,BorderLayout.SOUTH); //右边,为选择背景颜色按钮、画笔粗细选择按钮JPanel backgroundPanel=new JPanel(); jf.add(backgroundPanel,BorderLayout.EAST); backgroundPanel.setPreferredSize(new Dimension(150,1000)); //左边,获取当前状态如:背景颜色、画笔颜色、画笔性质JPanel nowPanel=new JPanel(); jf.add(nowPanel,BorderLayout.WEST); nowPanel.setPreferredSize(new Dimension(180,1000)); //左边放入当前状态PanelnowPanel.setBackground(Color.WHITE); JLabel label2=new JLabel("当前背景颜色"); label2.setFont(f); nowPanel.add(label2); //放入当前背景颜色JButton nowbackgroundColor=new JButton(); nowbackgroundColor.setPreferredSize(new Dimension(60,60)); nowbackgroundColor.setBackground(Color.WHITE); //背景初始化为灰色nowPanel.add(nowbackgroundColor); //放入当前画笔JLabel label3=new JLabel("请选择画笔模式"); label3.setFont(f); nowPanel.add(label3); //放入当前画笔颜色JButton nowColor=new JButton(); nowColor.setPreferredSize(new Dimension(60,60)); nowColor.setBackground(Color.BLACK); //画笔颜色初始化为黑色色nowPanel.add(nowColor); //获取当前画笔模式JLabel label4=new JLabel("当前画笔模式"); label4.setFont(f); nowPanel.add(label4); JTextField text=new JTextField(dl.btncontent); //获得选择画笔模式的按钮内容，得到当前画笔模式text.setPreferredSize(new Dimension (160,60)); text.setFont(f); text.setEditable(false); //不可改nowPanel.add(text); //获取当前画笔粗细状态JLabel label6=new JLabel("当前画笔粗细(中)"); //默认粗细为中label6.setFont(f); nowPanel.add(label6); JTextField text1=new JTextField("请选择画笔粗细"); text1.setPreferredSize(new Dimension (160,60)); text1.setFont(f); text1.setEditable(false); //不可编辑nowPanel.add(text1); //输入需要添加的文字JLabel label7=new JLabel("请输入文字:"); label7.setFont(f); nowPanel.add(label7); JTextField text2=new JTextField(); text2.setPreferredSize(new Dimension (160,60)); text2.setFont(f); nowPanel.add(text2); JLabel label8=new JLabel("请输入文字样式:"); label8.setFont(f); nowPanel.add(label8); JTextField text3=new JTextField("方正仿宋简体"); text3.setPreferredSize(new Dimension (160,60)); text3.setFont(f); nowPanel.add(text3); JLabel label9=new JLabel("请输入文字大小:"); label9.setFont(f); nowPanel.add(label9); JTextField text4=new JTextField("20"); text4.setPreferredSize(new Dimension (160,60)); text4.setFont(f); nowPanel.add(text4); //为获取文字内容加一个按钮并加上监听器JButton getcontent=new JButton("获取文字"); getcontent .setFont(f); getcontent.setBackground(Color.YELLOW); getcontent.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {String content=text2.getText(); String mode=text3.getText(); String size=text4.getText(); dl.mode=mode; //获取文字样式dl.content=content; //获取文字内容dl.size=size; //获取文字大小}}); nowPanel.add(getcontent); //最后在当前状态画板中加一个清除画布内容的功能JButton clear=new JButton("清除"); clear.setFont(f); clear.setBackground(Color.RED); clear.addActionListener(dl); nowPanel.add(clear); //添加按钮到北边（每个按钮写两行代码太多，通过数组方式添加按钮）//加入标签（选择画笔模式）JLabel labelh =new JLabel("选择画笔模式"); labelh.setFont(f); funcPanel.add(labelh); //将按钮名字保存在数组中，后依次存储String[] btnstr= {"画笔","直线","矩形","填充矩形","圆","填充圆","弧线","喷枪","波形","分形","长方体","九宫格递归","文字","橡皮"}; //将画笔状态按钮防置panel中for( int i=0; i
2、DrawListner类，画板功能监听器
package Java课程设计; import java.awt.BasicStroke; import java.awt.Color; import java.awt.Container; import java.awt.Dimension; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.RenderingHints; import java.awt.Shape; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseMotionListener; import java.awt.geom.AffineTransform; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextField; import java.awt.Color; import java.util.ArrayList; import java.util.Random; import Java课程设计.Drawpad; public class DrawListener implements MouseListener,ActionListener,MouseMotionListener {//获取画笔Graphics2D g; //获取在保存图片上的画笔Graphics2D g3; //获取按钮内容String btnstr; Color background=Color.white; //背景颜色默认为白色Color graphcolor=Color.BLACK; //画笔颜色默认为黑色JButton btn; int x1, y1, x2, y2; // 声明坐标变量 int x3=400; int y3=0; int graphsize=3; //默认为中等画笔String btncontent="画笔"; //默认画笔模式为画笔String content; //获取文字中的文字内容String mode="方正仿宋简体"; //文字样式默认为“方正仿宋简体”String size="20"; //九宫格递归方法,画出九宫格public void dg(int x,int y,int width,int height) {//九宫格函数，九宫格的实现if(width<3) {return; }if(width>90) {g.fillRect(x+width/3, y+height/3, width/3, height/3); g3.fillRect(x+width/3, y+height/3, width/3, height/3); dg(x, y, width/3, height/3); dg(x+width/3, y, width/3, height/3); dg(x+(width/3)*2, y, width/3, height/3); dg(x, y+height/3, width/3, height/3); dg(x, y+(height/3)*2, width/3, height/3); dg(x+width/3, y+height/3, width/3, height/3); dg(x+width/3, y+(height/3)*2, width/3, height/3); dg(x+(width/3)*2, y+height/3, width/3, height/3); dg(x+(width/3)*2, y+(height/3)*2, width/3, height/3); }//九宫格的实现else {g.drawOval(x+width/3, y+height/3, width/3, height/3); g3.drawOval(x+width/3, y+height/3, width/3, height/3); dg(x, y, width/3, height/3); dg(x+width/3, y, width/3, height/3); dg(x+(width/3)*2, y, width/3, height/3); dg(x, y+height/3, width/3, height/3); dg(x, y+(height/3)*2, width/3, height/3); dg(x+width/3, y+height/3, width/3, height/3); dg(x+width/3, y+(height/3)*2, width/3, height/3); dg(x+(width/3)*2, y+height/3, width/3, height/3); dg(x+(width/3)*2, y+(height/3)*2, width/3, height/3); }}//判断是颜色按钮还是画笔按钮,改变的全部是画笔按钮public void actionPerformed(ActionEvent e) {btnstr=e.getActionCommand(); //获取按钮的文字内容//g.setColor(Color.black); //如果为颜色按钮，将画笔改颜色if(btnstr.equals("清除")){//重新填充背景，同时将画笔置为背景颜色System.out.println(background); g.setColor(background); //保存图片画笔填充背景颜色g.fillRect(0, 0, 1300, 800); g3.setColor(background); //画笔重新填充背景g3.fillRect(0, 0, 1300, 800); g.setColor(graphcolor); g3.setColor(graphcolor); }else{if(btnstr.equals("")) {//获取点击内容,将其内容强制转换成JButtonbtn=(JButton) e.getSource(); //获取颜色按钮颜色graphcolor=btn.getBackground(); }//若为画笔粗细，获取粗细大小else if(btnstr.equals("细")){graphsize=1; //画笔大小为细，大小size为1}else if(btnstr.equals("中")){graphsize=3; }else if(btnstr.equals("粗")){graphsize=5; }else{btncontent=btnstr; //获取画笔模式按钮的内容}}}//鼠标点击方法@Overridepublic void mouseClicked(MouseEvent e) {System.out.println("点击"); }//鼠标按下方法@Overridepublic void mousePressed(MouseEvent e) {System.out.println("按下"); x1=e.getX(); y1 =e.getY(); }//重写鼠标释放时的方法@Overridepublic void mouseReleased(MouseEvent e) {g.setColor(graphcolor); //获取保存画笔的颜色g3.setColor(graphcolor); //获取画板画笔的颜色x2=e.getX(); y2 =e.getY(); //选取画笔模式为直线时if(btncontent.equals("直线")) {g.setStroke(new BasicStroke(graphsize)); //保存画笔进行画图g.drawLine(x1, y1, x2, y2); //画笔画直线g3.setStroke(new BasicStroke(graphsize)); //置画笔大小g3.drawLine(x1, y1, x2, y2); }//选取画笔模式为波形时else if(btncontent.equals("波形")) {//波形函数g.setStroke(new BasicStroke(graphsize)); //置画笔大小g3.setStroke(new BasicStroke(graphsize)); double x4 = 0,y4 = 0; double a2=1.40,b2=1.56,c2=1.40,d2=-6.56; //波形函数for(int i=0; i<5000; i++) {double x5=Math.sin(a2*x4)-Math.cos(b2*y4); double y5=Math.sin(c2*x4)-Math.cos(d2*y4); x4=x5; y4=y5; int px=(int)(x5*100+x1); int py=(int)(y5*100+y1); //画波形g.drawLine(px, py, px, py); g3.drawLine(px, py, px, py); }}//选取画笔模式为矩形时else if(btncontent.equals("矩形")) {g.setStroke(new BasicStroke(graphsize)); //获取矩形画笔的大小g.drawRect(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2-x1), Math.abs(y2-y1)); //画矩形g3.setStroke(new BasicStroke(graphsize)); g3.drawRect(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2-x1), Math.abs(y2-y1)); }//选取的画笔模式为填充矩形else if(btncontent.equals("填充矩形")){//画填充矩形g.fillRect(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2-x1), Math.abs(y2-y1)); g3.fillRect(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2-x1), Math.abs(y2-y1)); }//长方体函数else if(btncontent.equals("长方体")){g.setStroke(new BasicStroke(graphsize)); //获取长方体画笔大小g.setColor(btn.getBackground()); //将画笔颜色置选择画笔颜色按钮颜色//长方体函数g.fillRect(Math.min(x1,x2),Math.min(y1,y2),Math.abs(x1-x2),Math.abs(y1-y2)); g3.setStroke(new BasicStroke(graphsize)); g3.setColor(btn.getBackground()); g3.fillRect(Math.min(x1,x2),Math.min(y1,y2),Math.abs(x1-x2),Math.abs(y1-y2)); int a,b,c,d; a=Math.min(x1, x2); b=Math.max(x1, x2); c=Math.min(y1, y2); d=Math.max(y1, y2); int m=(int)((b-a)*Math.cos(Math.PI/4)*Math.sin(Math.PI/4)); int n=(int)((b-a)*Math.cos(Math.PI/4)*Math.sin(Math.PI/4)); //顶面g.setColor(btn.getBackground()); g.fillPolygon(new int[] {a, a+m, b+m,b},new int[] {c,c-n,c-n,c},4); //右侧面g.setColor(btn.getBackground()); g.fillPolygon(new int[] {b, b, b+m,b+m},new int[] {c,d,d-n,c-n},4); g3.setColor(btn.getBackground()); g3.fillPolygon(new int[] {a, a+m, b+m,b},new int[] {c,c-n,c-n,c},4); //右侧面g3.setColor(btn.getBackground()); g3.fillPolygon(new int[] {b, b, b+m,b+m},new int[] {c,d,d-n,c-n},4); }//分形函数else if(btncontent.equals("分形")){g.setStroke(new BasicStroke(graphsize)); //获取画笔大小g3.setStroke(new BasicStroke(graphsize)); double x = 0,y = 0; //分形函数实现double a1=-1.8,b=-2.0,c=-0.5,d=-0.9; for(int i=0; i<5000; i++) {double x3=Math.sin(a1*y)-c*Math.cos(a1*x); double y3=Math.sin(b*x)-d*Math.cos(b*y); x=x3; y=y3; int px=(int)(x3*100+x1); int py=(int)(y3*100+y1); g.drawLine(px, py, px, py); g3.drawLine(px, py, px, py); }}//画圆else if(btncontent.equals("圆")) {g.setStroke(new BasicStroke(graphsize)); //获取画笔大小g.drawOval(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2-x1), Math.abs(y2-y1)); //画圆g3.setStroke(new BasicStroke(graphsize)); g3.drawOval(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2-x1), Math.abs(y2-y1)); }//画填充圆else if(btncontent.equals("填充圆")){g.fillOval(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2-x1), Math.abs(y2-y1)); //画填充圆g3.fillOval(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2-x1), Math.abs(y2-y1)); }//当选取模式为文字else if(btncontent.equals("文字")){//获取画笔大小g.setStroke(new BasicStroke(15)); Font font = new Font(mode, Font.BOLD, Integer.parseInt(size)); //获得文字内容，文字大小，文字样式g.setFont(font); //在画笔中置文字样式和大小g.drawString(content, x1, y1); //写上文字内容g3.setStroke(new BasicStroke(15)); g3.setFont(font); //放入文字样式和大小g3.drawString(content, x1, y1); }//当画笔模式为弧线时else if(btncontent.equals("弧线")){g.setStroke(new BasicStroke(graphsize)); //获取画笔大小//弧线函数g.drawArc(x1, y1, 100, 60, 0, 180); g3.setStroke(new BasicStroke(graphsize)); g3.drawArc(x1, y1, 100, 60, 0, 180); }//九宫格递归，调用九宫格函数else if(btncontent.equals("九宫格递归")) {//九宫格递归实现dg(0,50,600,600); }System.out.println("释放"); }@Override//鼠标进入方法public void mouseEntered(MouseEvent e) {System.out.println("进入"); }@Override//鼠标离开界面方法public void mouseExited(MouseEvent e) {System.out.println("离开"); }@Overridepublic void mouseMoved(MouseEvent e) {}//重写鼠标移动函数@Overridepublic void mouseDragged(MouseEvent e) {g.setColor(graphcolor); //获取画笔颜色g3.setColor(graphcolor); // TODO Auto-generated method stubx2=e.getX(); y2 =e.getY(); //当为画笔时if(btncontent.equals("画笔")){g.setStroke(new BasicStroke(graphsize)); //获取当前画笔大小//画笔实现g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g.drawLine(x1, y1, x2, y2); g3.setStroke(new BasicStroke(graphsize)); g3.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g3.drawLine(x1, y1, x2, y2); x1 = x2; y1 = y2; }//橡皮擦if(btncontent.equals("橡皮")){//将画笔颜色置为背景颜色g.setColor(background); g3.setColor(background); g.setStroke(new BasicStroke(30)); //将橡皮擦的大小置大小为30g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g.drawLine(x1, y1, x2, y2); g3.setStroke(new BasicStroke(30)); g3.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g3.drawLine(x1, y1, x2, y2); x1 = x2; y1 = y2; //使用过后，将画笔颜色重新置为原来颜色g.setColor(graphcolor); g3.setColor(graphcolor); }//喷枪函数else if(btncontent.equals("喷枪")){g.setStroke(new BasicStroke(graphsize)); //不用加粗，获取画笔大小g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g3.setStroke(new BasicStroke(graphsize)); //不用加粗g3.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); //喷枪实现函数for(int k=0; k<20; k++){Random i=new Random(); int a=i.nextInt(10); int b=i.nextInt(20); g.drawLine(x2+a, y2+b, x2+a, y2+b); g3.drawLine(x2+a, y2+b, x2+a, y2+b); }}}}

画板演示:
Java实现简单小画板
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保存图片:
Java实现简单小画板
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