drawingshapes.java

一个简单绘图程序

//********************************************************************
//  DrawingShapes.java       Author: XieXing
//
// Application allows user to draw lines, rectangles and ovals and 
// choose the color of the drawn shape.
//********************************************************************

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

public class DrawingShapes extends JFrame 
{
   // 绘图工具工具条
   private JToolBar controlsBar;
 
   //按钮组以实现按钮只能单选
   private ButtonGroup buttonGroup;
   
   // 颜色设置按钮
   private JButton colorButton;
   
   // 填充按钮
   private JToggleButton fillButton;

   // 绘图区
   private DrawingPanel paintPanel;

   // 绘图的形状类型
   private String[] shapeTypes = { "Line", "Rect", "Oval" ,"Circle" };
   
   //绘图图形选择按钮
   private JToggleButton[] button = new JToggleButton[shapeTypes.length];
   
   //图标按钮图像
   private Icon[] icons; 
   
   //鼠标移动到相应按钮上面上停留时给出的提示说明条
   private String tipText[]={"画直线","画矩形","画椭圆","画圆","选择当前绘画的颜色","绘制填充图形"};

   // 构造函数
   public DrawingShapes()
   {
      super("微型绘图大师");
      
      // 创建容器
      Container contentPane = getContentPane();

      // 组件布局设置
      contentPane.setLayout( null );

      // 建立controlsBar面板
      controlsBar = new JToolBar();
      controlsBar.setBounds( 0, 0, 600, 54);
      controlsBar.setLayout( null );
      contentPane.add( controlsBar );
      
      // 建立paintPanel面板
      paintPanel = new DrawingPanel();
      paintPanel.setBounds( 0, 54, 600, 560 );
      paintPanel.setBackground( Color.WHITE );
      contentPane.add( paintPanel );

      // 绘图按钮组
      ButtonGroup buttonGroup = new ButtonGroup();

      for(int i=0;i<button.length;i++)
      {
      	icons = new ImageIcon[shapeTypes.length];
      	icons[i] = new ImageIcon(shapeTypes[i] + ".jpg");
      	button[i] = new JToggleButton(icons[i]); 
      	button[i].setBounds( 20+80*i, 3, 48, 48 );
      	button[i].setToolTipText(tipText[i]);
        button[i].addActionListener(

         new ActionListener() // 匿名内部类
         {
            // 响应组合框事件，选择绘图形状类型
            public void actionPerformed( ActionEvent event )
            {
               buttonActionPerformed( event );
            }

          }

       );
       buttonGroup.add(button[i]);
       controlsBar.add(button[i]);
      }

      // 建立颜色设置按钮colorButton
      colorButton = new JButton(new ImageIcon("Color.jpg"));
      colorButton.setBounds( 400, 3, 48, 48 );
      colorButton.setToolTipText(tipText[4]);
      controlsBar.add(colorButton);
      colorButton.addActionListener(

         new ActionListener() // 匿名内部类
         {
            // 响应颜色按钮按下
            public void actionPerformed( ActionEvent event )
            {
               colorButtonActionPerformed( event );
            }

         }

      );
      
      // 建立颜色设置按钮colorButton
      fillButton = new JToggleButton(new ImageIcon("fill.jpg"));
      fillButton.setBounds( 480, 3, 48, 48 );
      fillButton.setToolTipText(tipText[5]);
      controlsBar.add(fillButton);
      fillButton.addActionListener(

         new ActionListener() // 匿名内部类
         {
            // 响应颜色按钮按下
            public void actionPerformed( ActionEvent event )
            {
               fillButtonActionPerformed( event );
            }

         }

      );
      

      // 设置窗口属性
      setSize( 600, 500 );          // 设置窗口尺寸
      setVisible( true );           // 显示窗口

   } 
   
   // 颜色设置对话框，下一绘图图形颜色选择
   private void fillButtonActionPerformed( ActionEvent event )
   {
      JToggleButton toggle = (JToggleButton)event.getSource();
      if(toggle.isSelected())
      {
         paintPanel.setfillShape(true);
      }
      else
      {
         paintPanel.setfillShape(false);
      }    
   }

   // 颜色设置对话框，下一绘图图形颜色选择
   private void colorButtonActionPerformed( ActionEvent event )
   {
      Color selection = JColorChooser.showDialog( this, 
         "颜色设置", Color.BLACK );

      if ( selection != null )
      {
         colorButton.setBackground( selection );
         paintPanel.setCurrentColor( selection );
      }

   }

   // 选择绘图形状类型
   private void buttonActionPerformed( ActionEvent event ) 
   {
   	  for(int i=0;i<button.length;i++)
      {
      	if (event.getSource() == button[i])
      	paintPanel.setCurrentShapeType(i);
      }

   }

   // main方法
   public static void main( String args[] )
   {
      DrawingShapes drawShape = new DrawingShapes();
      drawShape.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
   } 

}