canvas.java

用socket编写的白板

package test;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import javax.swing.JPanel;
import test.*;


public class Canvas extends JPanel implements MouseMotionListener,MouseListener
{

	 private float wide;
	 private Color background;
	 private Color foreground;
	 private int x1;
	 private int y1;
	 private int x2;
	 private int y2;
	 private Graphics2D g2d;
	 private  BufferedImage bufImage;
	 private MainFrame mainFrame;
	 
	 public Canvas(MainFrame mainFrame )
	 {
		 setMainFrame(mainFrame);
		  
		  setLayout(null);
		  this.addMouseListener(this);
		  this.addMouseMotionListener(this);
		  
		  wide = 3.0F;
		  background = new Color(255, 255, 255);
		  foreground = new Color(12,44, 255);
		  setBufImage(new BufferedImage(400, 400, BufferedImage.TYPE_INT_RGB));
		        
		  setG2d((Graphics2D)getBufImage().getGraphics());
		  getG2d().setColor(background);
		  getG2d().fillRect(0, 0, 400, 400);
		  x1 = -1;
		  y1 = -1;

		     setCursor(
		       getToolkit().createCustomCursor(
		               getToolkit().createImage("./res/pen.png"),
		               new Point(0,0),
		               "直线"
		       )
		      );
		 }

		 public void paint(Graphics g)
		 {
		  g.drawImage(getBufImage(), 0, 0, this);
		 }
		 
		 
		 public void mouseDragged(MouseEvent e)
		 {

		  if(x1 >= 0 && y1 >= 0)
		  {
		   x2 = e.getX();
		   y2 = e.getY();
		   draw(x1, y1, x2, y2);
		  }
		  x1 = e.getX();
		  y1 = e.getY();

		  try
		  {
		   getMainFrame().getClientSend().send(x1, y1, x2, y2);
		  }
		  catch (Exception e1)
		  {
		   e1.printStackTrace();
		  }
		 }
		 
		 public void draw(int ox1, int oy1, int ox2, int oy2)
		 {
		  Graphics g = getGraphics();  
		  getG2d().setColor(foreground);
		  getG2d().setStroke(new BasicStroke(wide));
		  getG2d().drawLine(ox1, oy1, ox2, oy2);
		  update(g);
		 }
		 
		 public void mouseMoved(MouseEvent e)
		 {
		  
		 }

		 public void mouseClicked(MouseEvent e)
		 {
		  // TODO 自动生成方法存根
		 }

		 public void mousePressed(MouseEvent e)
		 {
		  // TODO 自动生成方法存根
		 }

		 public void mouseReleased(MouseEvent e)
		 {
		  x1 = -1;
		  y1 = -1;
		 }

		 public void mouseEntered(MouseEvent e)
		 {
		  // TODO 自动生成方法存根
		 }

		 public void mouseExited(MouseEvent e)
		 {
		  // TODO 自动生成方法存根
		 }

		 public BufferedImage getBufImage()
		 {
		  return bufImage;
		 }

		 public void setBufImage(BufferedImage bufImage)
		 {
		  this.bufImage = bufImage;
		 }
		 
		 public MainFrame getMainFrame()
		 {
		  return mainFrame;
		 }

		 public void setMainFrame(MainFrame mainFrame)
		 {
		  this.mainFrame = mainFrame;
		 }

		 public Graphics2D getG2d()
		 {
		  return g2d;
		 }

		 public void setG2d(Graphics2D g2d)
		 {
		  this.g2d = g2d;
		 }

		 
		}