drawfigure.java

java语言实现的一个画图小程序,可以实现绘图

  
package drawfigure;     
import java.awt.*;                                  
import java.awt.event.*;                        
import javax.swing.*;
import java.util.*;                                                                                                   
class DrawFigure extends JFrame implements MouseListener,MouseMotionListener,AdjustmentListener,ItemListener{     
Stack<Shape> stack=new Stack<Shape>();                        //暂存所画图形的栈
Stack<Shape> delStack=new Stack<Shape>();                     //删除图形的栈，用于恢复
boolean saved=true;                                           //判断是否已经保存过
JPanel p1=new JPanel();
JPanel p2=new JPanel();
JPanel top=new JPanel();
JPanel center=new JPanel();
JPanel bottom=new JPanel();
ButtonGroup g=new ButtonGroup();
JRadioButton op1=new JRadioButton("画",true);
JRadioButton op3=new JRadioButton("圆",false);
JRadioButton op2=new JRadioButton("直线",false);
JRadioButton op4=new JRadioButton("矩形",false);
JCheckBox c1=new JCheckBox("填充");
Color c=Color.black;
JTextArea tt=new JTextArea(2,3);
int f=1; //绘图类型,1-任意画,2-画直线,3-画圆,4-画矩形         
int sx,sy,x,y; //用于保存坐标
boolean fill=false; //是否填充
boolean flag=false;                                                              //用于判断是否是某个绘图的开始
JScrollBar r1 = new JScrollBar(JScrollBar.HORIZONTAL,0,4,0,255);                 //颜色滚动条
JScrollBar g1 = new JScrollBar(JScrollBar.HORIZONTAL,0,4,0,255);
JScrollBar b1 = new JScrollBar(JScrollBar.HORIZONTAL,0,4,0,255);
public DrawFigure() {
getContentPane().setLayout(new BorderLayout());
setDefaultCloseOperation(EXIT_ON_CLOSE);
 JMenuBar mb = new JMenuBar();                                             //设置菜单文件
     JMenu file1 = new JMenu("文件"); mb.add(file1);
          JMenuItem save = new JMenuItem("保存");   file1.add(save);
          JMenuItem open = new JMenuItem("导入");   file1.add(open);
          JMenuItem clear = new JMenuItem("重画");  file1.add(clear);
          file1.addSeparator();
          JMenuItem exit = new JMenuItem("退出");    file1.add(exit);
    JMenu file2 = new JMenu("编辑");  mb.add(file2);
          JMenuItem delet = new JMenuItem("清除图形");   file2.add(delet);
          JMenuItem reverse = new JMenuItem("恢复清除");   file2.add(reverse);
 
 top.setLayout(new BorderLayout());
 top.add(mb,"West"); 
 center.setOpaque(true);
 center.setBackground(Color.white);
tt.setBackground(Color.black);
p1.setLayout(new FlowLayout()); //设置流动布局
p1.setBackground(Color.lightGray); //设置背景色
p2.setLayout(new GridLayout(3,1)) ; //设置网格布局
p2.setPreferredSize(new Dimension(150,50));
p2.add(r1);p2.add(g1);p2.add(b1);
tt.setEditable(false); //文本不能编辑,用于显示色彩
g.add(op1);g.add(op2);g.add(op3);g.add(op4);
p1.add(op1);p1.add(op2);p1.add(op3);p1.add(op4);
p1.add(c1);p1.add(tt);
bottom.add(p1);bottom.add(p2);
c1.addItemListener(this);
r1.addAdjustmentListener(this);
g1.addAdjustmentListener(this);
b1.addAdjustmentListener(this);
op1.addItemListener(this);
op2.addItemListener(this);
op3.addItemListener(this);
op4.addItemListener(this);
center.addMouseListener(this); 
center.addMouseMotionListener(this);
getContentPane().add(top,"North");
getContentPane().add(bottom,"South");
getContentPane().add(center,"Center");
this.setTitle("绘图程序");
setSize(500,300);
setVisible(true);
 save.addActionListener(new ActionListener(){                        //保存文件
    public void actionPerformed(ActionEvent event)
    {   if(!saved)
        save();
     }
  });
  open.addActionListener(new ActionListener(){                       //打开存储的图形文件
    public void actionPerformed(ActionEvent event)
    {     if(saved)
          open();
          else{
           int judge=JOptionPane.showConfirmDialog(null,"修改尚未保存，是否保存画图？", "警告",JOptionPane.INFORMATION_MESSAGE); //0-是，1-否，2-取消。
         if(judge==0){
             save();
           }
         else if(judge==1){
              open();
             }
              else{repaint();}
          }
    }
  });
  clear.addActionListener(new ActionListener(){                       //清空面板，重画；
    public void actionPerformed(ActionEvent event)
    {   if(!saved)
        { int judge=JOptionPane.showConfirmDialog(null,"修改尚未保存，是否保存画图？", "警告",JOptionPane.INFORMATION_MESSAGE); //0-是，1-否，2-取消。
         if(judge==0){
             save();
         }
         else if(judge==1){
           stack.clear();saved=true;
           repaint();
         }
         else{repaint();}                                           
        }
        else {
            stack.clear();  
            repaint();
            }
        } 
  });
  exit.addActionListener(new ActionListener(){                          //退出绘图程序。
    public void actionPerformed(ActionEvent event)
    {  if(!saved)
        { int judge=JOptionPane.showConfirmDialog(null,"修改尚未保存，是否保存画图？", "警告",JOptionPane.INFORMATION_MESSAGE); //0-是，1-否，2-取消。
         if(judge==0){
             save();
         }
         else if(judge==1){
             setVisible(false);System.exit(0);
         }
         else{repaint();}
        }
      else {
           setVisible(false);   System.exit(0);
            }
     }
  });
  delet.addActionListener(new ActionListener(){                             //删除最新画的图形
    public void actionPerformed(ActionEvent event)
    {  Shape s = new Shape();
        if(stack.size()>0){
        s=stack.pop();
        delStack.push(s);
        repaint();
        }
        else 
         JOptionPane.showMessageDialog(null,"已经没有图形可以撤销","错误",JOptionPane.INFORMATION_MESSAGE);
     }
  });
  reverse.addActionListener(new ActionListener(){                             //撤销删除
    public void actionPerformed(ActionEvent event)
    {
        Shape s = new Shape();
        if(delStack.size()>0){
        s=delStack.pop();
        stack.push(s);
        s.g=center.getGraphics();
        s.draw();                 
        }
       /* else{
        repaint();
        JOptionPane.showMessageDialog(null,"已经没有图形可以恢复","错误",JOptionPane.INFORMATION_MESSAGE);}*/
     }
  });
    /*getContentPane().addFocusListener(new FocusListener(){
    @Override
    public void focusGained(FocusEvent event){
    repaint();
    }
    @Override
    public void focusLost(FocusEvent event){
    }
    });*/
}
public void save()
   {  Save s = new Save(this); }
public void open()
   {  Open o = new Open(this);}
    @Override
public void paint(Graphics g)                  //覆盖paint方法
  {  super.paint(g);
     g=center.getGraphics();
    for(int i=0;i<stack.size();i++)
    {   stack.get(i).g=g;
        stack.get(i).draw();
     }
   }
public void mousePressed(MouseEvent e){
flag=false;
sx=e.getX();sy=e.getY();//绘图开始点         
}
    public void mouseReleased(MouseEvent e) {
        int x0, y0;
        Graphics g456 = center.getGraphics();
        switch (f) {
            case 2: //画直线
                g456.setXORMode(Color.white); //设置异或画图模式
                g456.drawLine(sx, sy, x, y); //清上一次移动时画的线
                x = e.getX();