Java实现简单的绘图软件

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 AREA_HEIGHT

BufferedImage.TYPE_INT_RGB); Graphics2D

g2

=

(Graphics2D)

image.getGraphics();

private JFrame frame = new JFrame(\"简单手绘程序\"); private JButton JButton(\"\");

public void init(){ g2.fillRect(0 AREA_HEIGHT);

g2.setColor(Color.black);

,

0

,AREA_WIDTH

,

DrawPanel

drawArea

= =

new new

DrawPanel();

buttonShowColor

image

=

new , ,

BufferedImage(AREA_WIDTH

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

actionPerformed(ActionEvent arg0) { do_save_actionPerformed(arg0); } });

JMenuItem

menuItemOpen

=

new

JMenuItem(\"打开\");

menuItemOpen.addActionListener(new ActionListener(){ public

void 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

JMenuItem(\"退出\");

menuItemExit.addActionListener(new ActionListener(){ public

actionPerformed(ActionEvent arg0) { System.exit(0); } });

void

menuFile.add(menuItemSave); menuFile.add(menuItemOpen); menuFile.add(menuItemExit); mb.add(menuFile);

JPanel buttonPanel = new JPanel(); FlowLayout

layout

=

new

FlowLayout(FlowLayout.CENTER, 20, 20); buttonPanel.setLayout(layout);

buttonPanel.setBackground(Color.gray);

JButton buttonDraw = new JButton(\"绘图\");

buttonDraw.addActionListener(new ActionListener(){ public

actionPerformed(ActionEvent arg0) { typeFlag = 1; } });

buttonPanel.add(buttonDraw);

void

JButton buttonLine = new JButton(\"直线\");

buttonLine.addActionListener(new ActionListener(){ public

actionPerformed(ActionEvent arg0) { typeFlag = 2; } });

buttonPanel.add(buttonLine);

JButton buttonRect = new JButton(\"矩形\");

buttonRect.addActionListener(new ActionListener(){ public

actionPerformed(ActionEvent arg0) { typeFlag = 3; } });

buttonPanel.add(buttonRect);

void void

JButton buttonEllipse = new JButton(\"椭圆\");

buttonEllipse.addActionListener(new ActionListener(){ public

actionPerformed(ActionEvent arg0) { typeFlag = 4; } });

buttonPanel.add(buttonEllipse);

JButton buttonDrop = new JButton(\"清除\");

buttonDrop.addActionListener(new ActionListener(){ public

actionPerformed(ActionEvent arg0) { typeFlag = 5;

g2.setColor(Color.white);

g2.fillRect(0 , 0 ,AREA_WIDTH , AREA_HEIGHT);

void void

drawArea.repaint(); } });

buttonPanel.add(buttonDrop); JButton

buttonColorChoose.addActionListener(new ActionListener(){ public

actionPerformed(ActionEvent arg0) {

do_buttonColorChoose_actionPerformed(arg0); } });

buttonPanel.add(buttonColorChoose);

buttonShowColor = new JButton(\"\"); buttonPanel.add(buttonShowColor);

void

buttonColorChoose

=

new

JButton(\"选择颜色\");

JLabel label = new JLabel(\"边框：\"); buttonPanel.add(label);

JComboBox combox

=

JComboBox();

for(int i=1; i<=36; i++){ combox.addItem(i); }

combox.addItemListener(new ItemListener() { public

itemStateChanged(ItemEvent e) { strokeTemp

Integer.parseInt(e.getItem().toString()) ; stroke =

BasicStroke(strokeTemp); } });

buttonPanel.add(combox);

new

void

= new

frame.add(buttonPanel,BorderLayout.SOUTH);

frame.add(mb,BorderLayout.NORTH);

frame.setBackground(Color.gray); frame.pack(); frame.setVisible(true); }

public static void main(String[] args) {

new ImageDraw().init(); }

class DrawPanel extends JPanel {

public void paint(Graphics g) {

Graphics2D g2 = (Graphics2D) g; g2.clearRect(0, AREA_HEIGHT); g2.setColor(color);

0,

AREA_WIDTH,

g2.setStroke(stroke);

g2.drawImage(image , 0 , 0 , null); if(typeFlag == 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(Color.white);

g2.fillRect(0 , 0 ,AREA_WIDTH , AREA_HEIGHT); }

} }

private

// TODO 自动生成的方法存根 JFileChooser JFileChooser();

chooser.setSelectedFile(new File(imageFile.getName()));

int option = chooser.showSaveDialog(null); if(option

JFileChooser.APPROVE_OPTION){ File file = chooser.getSelectedFile(); try {

ImageIO.write(image, \"jpg\ } catch (IOException e) { // TODO 自动生成的 catch 块 e.printStackTrace(); } }

==

chooser

=

new void

do_save_actionPerformed(ActionEvent arg0) {

}

private

do_open_actionPerformed(ActionEvent throws IOException {

// TODO 自动生成的方法存根 JFileChooser JFileChooser();

chooser.setFileFilter(new FileNameExtensionFilter(\"\

chooser.setFileSelectionMode(JFileChooser.FILES_ONLY);

int option = chooser.showOpenDialog(null); if(option

JFileChooser.APPROVE_OPTION){ imageFile = chooser.getSelectedFile(); Image

sourceImage

0,

= 0,

ImageIO.read(imageFile);

g2.drawImage(sourceImage, sourceImage.getWidth(null),

==

图

片

文

件

chooser

=

new void arg0)

sourceImage.getHeight(null), null); drawArea.repaint(); } }

private nEvent arg0) {

// TODO 自动生成的方法存根 JColorChooser JColorChooser();

color = chooser.showDialog(null, \"请选取颜色\

buttonShowColor.setBackground(color); }

private void do_mouseDragged(MouseEvent e) {

end_x = e.getX(); end_y = e.getY();

chooser

=

new void

do_buttonColorChoose_actionPerformed(Actio

width = Math.abs( end_x - start_x ); height = Math.abs( end_y - start_y );

if(end_x <= start_x && end_y <= start_y){ start_X = start_x - width; start_Y = start_y - height; }

if(end_x > start_x && end_y < start_y){ start_Y = start_y - height; start_X = start_x; }

if(end_x <= start_x && end_y >= start_y){ start_Y = start_y; start_X = start_x - width; }

if(end_x >= start_x && end_y >=start_y){ start_Y = start_y; start_X = start_x; }

if(typeFlag == 1){

if (pre_x > 0 && pre_y > 0) {

line = new Line2D.Float(pre_x, pre_y, end_x, end_y);

g2.setColor(color); g2.setStroke(stroke); g2.draw(line); }

pre_x = e.getX(); pre_y = e.getY(); drawArea.repaint(); }else{

drawArea.repaint(); } }

private void do_mousePressed(MouseEvent e1) {

// TODO 自动生成的方法存根 width = 0; height = 0;

start_x = end_x = pre_x = e1.getX(); start_y = end_y = pre_y = e1.getY();

if(endFlag == 2){ g2.draw(line); }

if(endFlag == 3){ g2.draw(rect); }

if(endFlag == 4) {

g2.draw(ellipse); }

drawArea.repaint(); } }