paintjpanel.java

简单的java小程序！关于画图软件的的 源码。

// Tutorial 27: PaintJPanel.java
// Panel allows user to create a shape.
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;

public class PaintJPanel extends JPanel {

   // ArrayList to hold the shapes
   private ArrayList shapesArrayList = new ArrayList();

   // currently selected shape type
   private String currentType = "Line";

   // currently selected color
   private Color currentColor = new Color( 204, 204, 204 );

   // no-argument constructor
   public PaintJPanel()
   {
      addMouseListener( 
         
         new MouseAdapter() // anonymous inner class
         {
            // event handler called when mouse button is pressed
            public void mousePressed( MouseEvent event )
            {
               paintJPanelMousePressed( event );
            }

         } // end anonymous inner class

      ); // end call to addMouseListener

      addMouseMotionListener(
         
         new MouseMotionAdapter() // anonymous inner class
         {
            // event handler called when the mouse is dragged
            public void mouseDragged( MouseEvent event )
            {
               paintJPanelMouseDragged( event );
            }

         } // end anonymous inner class

      ); // end call to addMouseMotionListener

   } // end constructor

   // change the current shape type
   public void setCurrentShapeType( String shape )
   {
      currentType = shape;

   } // end method setCurrentShapeType

   // change the current color
   public void setCurrentColor( Color shapeColor )
   {
      currentColor = shapeColor;

   } // end method setCurrentColor

   // create a new shape
   public void paintJPanelMousePressed( MouseEvent event )
   {

   } // end method paintJPanelMousePressed

   // reset the second point for the shape
   public void paintJPanelMouseDragged( MouseEvent event )
   {

   } // end method paintJPanelMouseDragged

   // paint all the shapes
   public void paintComponent( Graphics g )
   {
      super.paintComponent( g );
   
   } // end method paintComponent

} // end class PaintJPanel

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