Java实现简单的绘图软件

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.filechooser.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 = 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.Float 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 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);

}

});

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.CROSSHAIR_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_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();

}

}

});