Java实现简单的绘图软件

1、项目效果图：项目源代码：import java.awt.*;import java.awt.event.*;import java.awt.geom.Ellipse2D;import java.awt.geom.Line2D;import java.awt.geom.Rectangle2D;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import javax.imageio.ImageIO;import javax.swing.*;import javax.swing.fi

2、lechooser.FileNameExtensionFilter;/* author: 蒋冰 */public class ImageDraw private int typeFlag = 1;private int endFlag = 1;private int strokeTemp = 1;private Color color = Color.black;private BasicStroke stroke = new BasicStroke();private float pre_x = 0;private float pre_y = 0;private float start_x

3、= 0;private float start_y = 0;private float start_X = 0;private float start_Y = 0;private float end_x = 0;private float end_y = 0;private float width = 0;private float height = 0;private final int AREA_WIDTH = 700;private final int AREA_HEIGHT = 400;private Line2D.Float line;private Rectangle2D.Floa

4、t rect;private Ellipse2D.Float ellipse;private File imageFile;BufferedImage image = new BufferedImage(AREA_WIDTH , AREA_HEIGHT , BufferedImage.TYPE_INT_RGB);Graphics2D g2 = (Graphics2D) image.getGraphics();private JFrame frame = new JFrame(简单手绘程序);private DrawPanel drawArea = new DrawPanel();JButton

5、 buttonShowColor = new JButton();public void init()g2.fillRect(0 , 0 ,AREA_WIDTH , AREA_HEIGHT);g2.setColor(Color.black);drawArea.setPreferredSize(new Dimension(AREA_WIDTH , AREA_HEIGHT);drawArea.addMouseMotionListener(new MouseMotionAdapter()public void mouseDragged(MouseEvent e)do_mouseDragged(e);

6、);drawArea.addMouseListener(new MouseAdapter()public void mousePressed(MouseEvent e1)do_mousePressed(e1);public void mouseReleased(MouseEvent e)g2.setColor(color);g2.setStroke(stroke);endFlag = typeFlag;drawArea.repaint();public void mouseEntered(MouseEvent e)frame.setCursor(new Cursor(Cursor.CROSSH

7、AIR_CURSOR);public void mouseExited(MouseEvent e)frame.setCursor(null););frame.add(drawArea);JMenuBar mb = new JMenuBar();JMenu menuFile = new JMenu(文件);JMenuItem menuItemSave = new JMenuItem(保存);menuItemSave.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) do_save

8、_actionPerformed(arg0););JMenuItem menuItemOpen = new JMenuItem(打开);menuItemOpen.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) try do_open_actionPerformed(arg0); catch (IOException e) / TODO 自动生成的 catch 块e.printStackTrace(););JMenuItem menuItemExit = new JMenuIt

9、em(退出);menuItemExit.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) System.exit(0););menuFile.add(menuItemSave);menuFile.add(menuItemOpen);menuFile.add(menuItemExit);mb.add(menuFile);JPanel buttonPanel = new JPanel();FlowLayout layout = new FlowLayout(FlowLayout.C

10、ENTER, 20, 20);buttonPanel.setLayout(layout);buttonPanel.setBackground(Color.gray);JButton buttonDraw = new JButton(绘图);buttonDraw.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) typeFlag = 1;);buttonPanel.add(buttonDraw);JButton buttonLine = new JButton(直线);butto

11、nLine.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) typeFlag = 2;);buttonPanel.add(buttonLine);JButton buttonRect = new JButton(矩形);buttonRect.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) typeFlag = 3;);buttonPanel.add(butt

12、onRect);JButton buttonEllipse = new JButton(椭圆);buttonEllipse.addActionListener(new ActionListener()public void actionPerformed(ActionEvent arg0) typeFlag = 4;);buttonPanel.add(buttonEllipse);JButton buttonDrop = new JButton(清除);buttonDrop.addActionListener(new ActionListener()public void actionPerf

13、ormed(ActionEvent arg0) typeFlag = 5;g2.setColor(Color.white);g2.fillRect(0 , 0 ,AREA_WIDTH , AREA_HEIGHT);drawArea.repaint(););buttonPanel.add(buttonDrop);JButton buttonColorChoose = new JButton(选择颜色);buttonColorChoose.addActionListener(new ActionListener()public void actionPerformed(ActionEvent ar

14、g0) do_buttonColorChoose_actionPerformed(arg0););buttonPanel.add(buttonColorChoose);buttonShowColor = new JButton();buttonPanel.add(buttonShowColor);JLabel label = new JLabel(边框：);buttonPanel.add(label); JComboBox combox = new JComboBox(); for(int i=1; i=36; i+) combox.addItem(i); combox.addItemList

15、ener(new ItemListener() public void itemStateChanged(ItemEvent e) strokeTemp = Integer.parseInt(e.getItem().toString() ;stroke = new BasicStroke(strokeTemp););buttonPanel.add(combox);frame.add(buttonPanel,BorderLayout.SOUTH);frame.add(mb,BorderLayout.NORTH);frame.setBackground(Color.gray);frame.pack

16、();frame.setVisible(true);public static void main(String args) new ImageDraw().init();class DrawPanel extends JPanelpublic void paint(Graphics g)Graphics2D g2 = (Graphics2D) g;g2.clearRect(0, 0, AREA_WIDTH, AREA_HEIGHT);g2.setColor(color);g2.setStroke(stroke);g2.drawImage(image , 0 , 0 , null);if(ty

17、peFlag = 2)line = new Line2D.Float(start_x, start_y, end_x, end_y);g2.draw(line);if(typeFlag = 3)rect = new Rectangle2D.Float(start_X, start_Y, width, height);g2.draw(rect);if(typeFlag = 4)ellipse = new Ellipse2D.Float(start_X, start_Y, width, height);g2.draw(ellipse);if(typeFlag = 5)g2.setColor(Col

18、or.white);g2.fillRect(0 , 0 ,AREA_WIDTH , AREA_HEIGHT);private void do_save_actionPerformed(ActionEvent arg0) / TODO 自动生成的方法存根JFileChooser chooser = new JFileChooser();chooser.setSelectedFile(new File(imageFile.getName();int option = chooser.showSaveDialog(null);if(option = JFileChooser.APPROVE_OPTI

19、ON)File file = chooser.getSelectedFile();try ImageIO.write(image, jpg, file); catch (IOException e) / TODO 自动生成的 catch 块e.printStackTrace();private void do_open_actionPerformed(ActionEvent arg0) throws IOException / TODO 自动生成的方法存根JFileChooser chooser = new JFileChooser();chooser.setFileFilter(new Fi

20、leNameExtensionFilter(图片文件,jpg,jpeg,jif);chooser.setFileSelectionMode(JFileChooser.FILES_ONLY);int option = chooser.showOpenDialog(null);if(option = JFileChooser.APPROVE_OPTION)imageFile = chooser.getSelectedFile();Image sourceImage = ImageIO.read(imageFile);g2.drawImage(sourceImage, 0, 0, sourceIma

21、ge.getWidth(null), sourceImage.getHeight(null), null);drawArea.repaint();private void do_buttonColorChoose_actionPerformed(ActionEvent arg0) / TODO 自动生成的方法存根JColorChooser chooser = new JColorChooser();color = chooser.showDialog(null, 请选取颜色, Color.black);buttonShowColor.setBackground(color);private void do_mouseDragged(MouseEvent e) end_x = e.getX();end_y = e.getY();width = Math.abs( end_x - start_x );height = Math.abs( end_y - start_y