1、Java版本简单的手绘程序，点击右键可以选择颜色，对初学Java的同学还是很有帮助！学会做这个，下一步就可以做出一个简单的Windows版本的画图！

package project;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.MenuItem;
import java.awt.PopupMenu;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.p_w_picpath.BufferedImage;
/****@author huyongjian Oracle(Compus Solution Group)* @Date  2013-8-18* @version 2.0* @since JDK1.6（建议）Copy Right Information    COMPUS SOLUTION GROUPIDE:Eclipseclass:绘制图像01*/
public class HandDraw {//画图去的宽度private final int AREA_WIDTH=500;//画图去的高度private final int AREA_HEIGHT=400;//下面的prex、prey保存了上一次鼠标拖动事件的鼠标坐标private int preX=-1;private int preY=-1;//定义一个右键菜单用于设置画笔颜色PopupMenu pop=new PopupMenu();MenuItem redItem=new MenuItem("红色");MenuItem greenItem=new MenuItem("绿色");MenuItem blueItem=new MenuItem("蓝色");MenuItem blackItem=new MenuItem("黑色");//定义一个BufferedImage对象BufferedImage p_w_picpath=new BufferedImage(AREA_WIDTH,AREA_HEIGHT,BufferedImage.TYPE_INT_RGB);//获取p_w_picpath对象的GraphicsGraphics g=p_w_picpath.getGraphics();private Frame f=new Frame("简单手绘程序");private DrawCanvas drawArea=new DrawCanvas();//用于保存需要绘制什么图形的字符串属性private String shape="";//用于保存画笔颜色private Color foreColor=new Color(255,0,0);public void init(){ActionListener menuListener=new ActionListener(){public void actionPerformed(ActionEvent e){if(e.getActionCommand().equals("绿色")){foreColor=new Color(0,255,0);}if(e.getActionCommand().equals("红色")){foreColor=new Color(255,0,0);}if(e.getActionCommand().equals("蓝色")){foreColor=new Color(0,0,255);}if(e.getActionCommand().equals("黑色")){foreColor=new Color(0,0,0);}}};//为三个菜单添加事件监听器redItem.addActionListener(menuListener);greenItem.addActionListener(menuListener);blueItem.addActionListener(menuListener);blackItem.addActionListener(menuListener);//将菜单项组合成右键菜单pop.add(redItem);pop.add(greenItem);pop.add(blueItem);pop.add(blackItem);//将右键菜单添加到drawArea对象中drawArea.add(pop);//将p_w_picpath对象的背景色填充成白色g.fillRect(0, 0, AREA_WIDTH, AREA_HEIGHT);drawArea.setPreferredSize(new Dimension(AREA_WIDTH,AREA_HEIGHT));//监听鼠标移动动作drawArea.addMouseMotionListener(new MouseMotionAdapter(){//实现按下鼠标键并拖动的事件处理器public void mouseDragged(MouseEvent e) {//如果preX和preY大于0if(preX>0&&preY>0){//设置当前颜色g.setColor(foreColor);//绘制从上一次鼠标拖动事件点到本次鼠标拖动事件点的线段g.drawLine(preX, preY, e.getX(), e.getY());}//将当前鼠标事件点的x、y坐标保存起来preX=e.getX();preY=e.getY();//重绘drawArea对象drawArea.repaint();}});drawArea.addMouseListener(new MouseAdapter(){public void mouseReleased(MouseEvent e) {//弹出右键菜单if(e.isPopupTrigger()){pop.show(drawArea, e.getX(), e.getY());}//松开鼠标键,把上一次鼠标拖动事件的 x y坐标设为-1；preX=-1;preY=-1;}});f.add(drawArea);f.pack();f.setVisible(true);f.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}});f.setLocationRelativeTo(null);}public static void main(String[] args) {new HandDraw().init();}class DrawCanvas extends Canvas{public void paint(Graphics g) {g.drawImage(p_w_picpath, 0, 0, null);}}
}

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