package mypainter;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Main
{
public static void main(String[] args){
Font font=new Font("宋体",Font.PLAIN,12);
UIManager.put("Menu.font",font);
UIManager.put("MenuItem.font",font);
UIManager.put("Button.font",font);
UIManager.put("Label.font",font);
UIManager.put("RadioButton.font",font);
UIManager.put("CheckBox.font",font);
UIManager.put("ComboBox.font",font);
PaintFrame frame=new PaintFrame();
frame.setVisible(true);
}
}
class PaintFrame extends JFrame implements ActionListener
{
private JPanel leftPanel;
private JPanel bottomPanel;
JLabel typeLabel;
JLabel sizeLabel;
private JButton redButton;
private JButton greenButton;
private JButton blueButton;
private JButton blackButton;
private JButton yellowButton;
private JButton otherButton;
private JButton eraseButton;
private JRadioButton lineButton;
private JRadioButton rectButton;
private JRadioButton arcButton;
private JRadioButton ovalButton;
private ButtonGroup group;
private JComboBox lineSize;
private JCheckBox fillFlag;
private JMenuBar menubar;
private JMenu fileMenu;
private JMenu helpMenu;
private JMenuItem newItem;
private JMenuItem openItem;
private JMenuItem closeItem;
private JMenuItem saveItem;
private JMenuItem saveAsItem;
private JMenuItem exitItem;
private JMenuItem usageItem;
private JMenuItem aboutItem;
private int width;
private int height;
private int scrWidth;
private int scrHeight;
private PaintPanel paintPanel;
public PaintFrame(){
super("我的绘图程序");
initMenu();
width=800;
height=600;
this.setSize(width,height);
Toolkit toolkit=this.getToolkit();
scrWidth=toolkit.getScreenSize().width;
scrHeight=toolkit.getScreenSize().height;
this.setLocation((scrWidth-width)/2,(scrHeight-height)/2);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setResizable(false);
Container container=this.getContentPane();
container.setLayout(new BorderLayout());
leftPanel=new JPanel();
leftPanel.setLayout(new GridLayout(8,1));
typeLabel=new JLabel("请选择图案种类：");
lineButton=new JRadioButton("直线");
lineButton.setSelected(true);
lineButton.addActionListener(this);
rectButton=new JRadioButton("矩形");
rectButton.addActionListener(this);
arcButton=new JRadioButton("椭圆弧");
arcButton.addActionListener(this);
ovalButton=new JRadioButton("椭圆");
ovalButton.addActionListener(this);
group=new ButtonGroup();
group.add(lineButton);
group.add(rectButton);
group.add(arcButton);
group.add(ovalButton);
fillFlag=new JCheckBox("实心");
fillFlag.addActionListener(this);
sizeLabel=new JLabel("请指定线宽：");
lineSize=new JComboBox();
lineSize.addItem("1");
lineSize.addItem("3");
lineSize.addItem("5");
lineSize.addItem("10");
lineSize.setEditable(true);
lineSize.addActionListener(this);
leftPanel.add(typeLabel);
leftPanel.add(lineButton);
leftPanel.add(rectButton);
leftPanel.add(arcButton);
leftPanel.add(ovalButton);
leftPanel.add(fillFlag);
leftPanel.add(sizeLabel);
leftPanel.add(lineSize);
container.add(leftPanel,BorderLayout.WEST);
bottomPanel=new JPanel();
bottomPanel.setLayout(new GridLayout(1,7));
redButton=new JButton();
redButton.setBackground(Color.RED);
redButton.addActionListener(this);
greenButton=new JButton();
greenButton.setBackground(Color.GREEN);
greenButton.addActionListener(this);
blueButton=new JButton();
blueButton.setBackground(Color.BLUE);
blueButton.addActionListener(this);
blackButton=new JButton();
blackButton.setBackground(Color.BLACK);
blackButton.addActionListener(this);
yellowButton=new JButton();
yellowButton.setBackground(Color.YELLOW);
yellowButton.addActionListener(this);
otherButton=new JButton("其它");
otherButton.addActionListener(this);
eraseButton=new JButton("擦除");
eraseButton.addActionListener(this);
bottomPanel.add(redButton);
bottomPanel.add(greenButton);
bottomPanel.add(blueButton);
bottomPanel.add(blackButton);
bottomPanel.add(yellowButton);
bottomPanel.add(otherButton);
bottomPanel.add(eraseButton);
container.add(bottomPanel,BorderLayout.SOUTH);
paintPanel=new PaintPanel();
container.add(paintPanel,BorderLayout.CENTER);
}
private void initMenu(){
menubar=new JMenuBar();
fileMenu=new JMenu("文件");
newItem=new JMenuItem("新建");
newItem.addActionListener(this);
openItem=new JMenuItem("打开");
closeItem=new JMenuItem("关闭");
saveItem=new JMenuItem("保存");
saveAsItem=new JMenuItem("另存为");
exitItem=new JMenuItem("退出");
exitItem.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
dispose();
System.exit(0);
}
});
fileMenu.add(newItem);
fileMenu.add(openItem);
fileMenu.add(closeItem);
fileMenu.addSeparator();
fileMenu.add(saveItem);
fileMenu.add(saveAsItem);
fileMenu.addSeparator();
fileMenu.add(exitItem);
helpMenu=new JMenu("帮助");
usageItem=new JMenuItem("用法");
aboutItem=new JMenuItem("关于");
aboutItem.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
JOptionPane.showMessageDialog(null,"<html><body><h2>简易绘图程序</h2><h3>连云港职业技术学院</h3></body></html>","关于MyPainter",JOptionPane.INFORMATION_MESSAGE);
}
});
helpMenu.add(usageItem);
helpMenu.add(aboutItem);
menubar.add(fileMenu);
menubar.add(helpMenu);
this.setJMenuBar(menubar);
}
public void actionPerformed(ActionEvent e){
if(e.getSource()==redButton){
paintPanel.setColor(Color.RED);
}
else if(e.getSource()==greenButton){
paintPanel.setColor(Color.GREEN);
}
else if(e.getSource()==blueButton){
paintPanel.setColor(Color.BLUE);
}
else if(e.getSource()==blackButton){
paintPanel.setColor(Color.BLACK);
}
else if(e.getSource()==yellowButton){
paintPanel.setColor(Color.YELLOW);
}
else if(e.getSource()==otherButton){
paintPanel.setColor(JColorChooser.showDialog(this,"请指定要用的绘图颜色",paintPanel.getColor()));
}
else if(e.getSource()==lineButton){
paintPanel.setType(1);
}
else if(e.getSource()==rectButton){
paintPanel.setType(2);
}
else if(e.getSource()==arcButton){
paintPanel.setType(3);
}
else if(e.getSource()==ovalButton){
paintPanel.setType(4);
}
else if(e.getSource()==lineSize){
paintPanel.setLineSize(Integer.parseInt((String)lineSize.getSelectedItem()));
}
else if(e.getSource()==fillFlag){
paintPanel.setFillFlag(fillFlag.isSelected());
}
else if(e.getSource()==eraseButton){
paintPanel.clear();
}
}
}
class PaintPanel extends JPanel
{
private int x1;
private int y1;
private int x2;
private int y2;
private boolean flag=false;
private int type=1;
private Color color=Color.GREEN;
private int size=1;
private boolean fillFlag=false;
private boolean clearFlag=false;
public PaintPanel(){
this.addMouseListener(new MouseAdapter(){
public void mousePressed(MouseEvent e){
x1=e.getX();
y1=e.getY();
}
public void mouseReleased(MouseEvent e){
x2=e.getX();
y2=e.getY();
flag=true;
repaint();
}
});
}
public void paintComponent(Graphics g){
if(clearFlag){
super.paintComponent(g);
clearFlag=false;
}
if(flag==true){
Graphics2D g2d=(Graphics2D)g;
g2d.setColor(color);
g2d.setStroke(new BasicStroke(size));
switch(type){
case 1:{
g2d.drawLine(x1, y1, x2, y2);
break;
}
case 2:{
int left=(x1<x2?x1:x2);
int top=(y1<y2?y1:y2);
int width=Math.abs(x1-x2);
int height=Math.abs(y1-y2);
if(fillFlag){
g2d.fillRect(left,top, width, height);
}
else{
g2d.drawRect(left,top, width, height);
}
break;
}
case 3:{
int left=(x1<x2?x1:x2);
int top=(y1<y2?y1:y2);
int width=Math.abs(x1-x2);
int height=Math.abs(y1-y2);
int startAngle=0;
if(x1<x2&&y1<y2)startAngle=0;
if(x1<x2&&y1>y2)startAngle=90;
if(x1>x2&&y1<y2)startAngle=270;
if(x1>x2&&y1>y2)startAngle=180;
if(fillFlag){
g2d.fillArc(left,top, width, height,startAngle,90);
}
else{
g2d.drawArc(left,top, width, height,startAngle,90);
}
break;
}
case 4:{
int left=(x1<x2?x1:x2);
int top=(y1<y2?y1:y2);
int width=Math.abs(x1-x2);
int height=Math.abs(y1-y2);
if(fillFlag){
g2d.fillOval(left,top, width, height);
}
else{
g2d.drawOval(left,top, width, height);
}
break;
}
}
flag=false;
}
}
public void clear(){
clearFlag=true;
repaint();
}
public void setType(int type){
this.type=type;
}
public void setColor(Color color){
this.color=color;
}
public void setLineSize(int size){
this.size=size;
}
public void setFillFlag(boolean flag){
this.fillFlag=flag;
}
public Color getColor(){
return color;
}
}
