使用说明如下：
1.在主区域的上面有一个写有"drawLine"的线形图标和几个图象图标，将鼠标移到图象图标上，光标变为手形，点击一下，取得需要绘制的图标
，然后移动到绘制区，右键鼠标就可以把选种的图标放置到相应位置；
2.当在主区域内放置的图标超过两个之后，点击工具栏上的drawLine线形图标，使之变色，然后分别点击主区域里的动态图标A和动态图标B，将会在A和B之间出现一条连线，根据顺序，先被点击的图标指向后被点击的图标，这里是A-->B，线段绘制完毕之后，线形图标恢复初始状态，必须再点击才能进行图标连线（注：一个图标可同时与多个图标连线）；
3.把鼠标移动到主区域的动态图标上，光标变为移动形，点击鼠标，获取删除对象，按下键盘上的Delete键，就可以删除刚才选中的图标以及与它相连的所有线段。
4.在主区域双击鼠标右键，有子菜单可操作了。
注意事项：
1。必须把图片和该类放在同一目录下。否则，找不到图片了。
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.util.*;
public class applet7 extends Applet
{
private static final long serialVersionUID = 1L;
int count = 6; //装载的图片数量
Vector v = new Vector(); //储存绘图信息
Image[] img = new Image[count]; //把图片存入Image数组
int myWidth = 0, myHeight = 0; //箭头起点坐标
int widthcount = 0; //工具栏上图标之间隔
boolean[] b = new boolean[count];
int[] width = new int[count], height = new int[count], w = new int[count],
h = new int[count], wid = new int[count], hei = new int[count], ww = new int[count], hh = new int[count];
int startX = 0, startY = 0, endX = 0, endY = 0; //绘制图标间连线的起点和终点坐标
Canvas startObj = null, endObj = null; //起点和终点动态图标
String drawclear = ""; //是否绘制连线及指向箭头
int clickX = 0, clickY = 0, moveX = 0, moveY = 0; //分别是点击和拖动动态图标时的坐标
canvas[] can = null; //动态图标数组
myCanvas[] mycan = new myCanvas[count]; //动态图标数组
Canvas curcan = null; //当前获得焦点的图标
Canvas curdelcan = null; //需要删除的当前图标
Image curimg = null; //当前焦点图标的图象
JPanel jp = new JPanel(null); //工具栏
myCanvas drawLine = new myCanvas("drawLine"); //用工具栏图标类myCanvas的文字构造器构造的线型图标
MediaTracker mt = new MediaTracker(this); //媒体对象，用于装载图象到内存
PopupMenu popMenu2=new PopupMenu(); //右键菜单
public void init()
{
img[0] = this.getImage(this.getCodeBase(), "1.gif"); //获取图象
img[1] = this.getImage(this.getCodeBase(), "2.gif");
img[2] = this.getImage(this.getCodeBase(), "1.jpg");
img[3] = this.getImage(this.getCodeBase(), "2.jpg");
img[4] = this.getImage(this.getCodeBase(), "3.jpg");
img[5] = this.getImage(this.getCodeBase(), "4.jpg");
this.resize(800, 600); //设置applet的尺寸，在浏览器里浏览根据html代码来设置
this.setLayout(null); //设置布局管理器，因为要移动图标的位置，因此设置为null
for (int i = 0; i < img.length; i++)
mt.addImage(img[i], 0);
try
{
mt.waitForAll();
}
catch (Exception ex)
{
System.err.println(ex.toString());
}
//----------------在主区域绘制工具栏--------------------------------
this.add(jp); //添加工具栏
jp.setBounds(0, 0, 800, 80); //放置工具栏
jp.add(this.drawLine); //往工具栏上添加线型图标
jp.setBackground(new Color(230, 230, 230)); //设置线形图标背景
drawLine.setBounds(5, 5, 90, 30); //放置线形图标
//----------------在主区域绘制工具栏------结束-----------------------
//----------------显示工具条中的项-------------------------
for (int i = 0; i < img.length; i++)
{
mycan[i] = new myCanvas(img[i]);
width[i] = img[i].getWidth(this);
height[i] = img[i].getHeight(this);
jp.add(mycan[i]);
mycan[i].setBounds(100 + 5 * (i + 1) + widthcount, 5, img[i]
.getWidth(this), img[i].getHeight(this));
widthcount += img[i].getWidth(this);
}
//----------------显示工具条中的项-----结束--------------------
//---------------------右键子菜单项----------------------------------
MenuItem menuItem1=new MenuItem("隐藏工具栏");
MenuItem menuItem2=new MenuItem("显示工具栏");
MenuItem menuItem3=new MenuItem("清空画面");
popMenu2.add(menuItem1);
popMenu2.add(menuItem2);
popMenu2.add(menuItem3);
add(popMenu2);
menuItem1.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
jp.setVisible(false); //隐藏工具条
}
});
menuItem2.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
jp.setVisible(true);
}
});
menuItem3.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
//??????????????????
repaint(); //?????
}
}
);
//---------------------右键子菜单项-------结束----------------------------
//用于绘制图标之间的线段
drawLine.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
clickdrawLine(e);
}
});
//---------------------鼠标监听事件-------------------------------------------
this.addMouseListener(new MouseAdapter()
{
public void mouseClicked(MouseEvent e) //用于放置动态图标
{
clickhere(e);
}
public void mouseReleased(MouseEvent e)
{
if(e.getButton()==MouseEvent.BUTTON3 && e.getClickCount()==2)
{
popMenu2.show(e.getComponent(),e.getX(),e.getY()); //显示右键菜单
}
}
});
//----------------------鼠标监听事件-----------结束-----------------------------
}
public void clickhere(MouseEvent e)
{
if(this.curcan == null)
return;
if(e.getModifiers() == MouseEvent.BUTTON3_MASK) //往绘图区添加动态图标，位置在鼠标点击时的坐标点
{
Canvas ca = new canvas(curimg);
this.add(ca);
ca.setBounds(e.getX(), e.getY(), curimg.getWidth(this), curimg.getHeight(this));
this.validate();
curcan=null;
}
}
public void clickdrawLine(MouseEvent e)
{
if (drawLine.getBackground().equals(new Color(230, 230, 255))) //可以绘制线段
{
drawLine.setBackground(new Color(230, 230, 230));
startObj = null;
endObj = null;
drawclear = "";
}
else //不可绘制线段
{
drawLine.setBackground(new Color(230, 230, 255));
drawclear = "draw";
}
}
public void paint(Graphics g)
{
//绘制线段
for (int i = 0; i < v.size(); i++)
{
Vector v1 = (Vector) v.elementAt(i);
startX = ((int[]) v1.elementAt(1))[0]
+ ((int[]) v1.elementAt(1))[2] / 2;
startY = ((int[]) v1.elementAt(1))[1]
+ ((int[]) v1.elementAt(1))[3] / 2;
endX = ((int[]) v1.elementAt(1))[4] + ((int[]) v1.elementAt(1))[6]
/ 2;
endY = ((int[]) v1.elementAt(1))[5] + ((int[]) v1.elementAt(1))[7]
/ 2;
g.drawLine(startX, startY, endX, endY);
drawArrowhead(g, ((Canvas[]) v1.elementAt(0))[0], ((Canvas[]) v1
.elementAt(0))[1]);
}
}
//绘制箭头
public void drawArrowhead(Graphics g, Canvas startObj, Canvas endObj)
{
double xx = 0, yy = 0, xx1 = 0, yy1 = 0, xx2 = 0, yy2 = 0;
myWidth = myHeight = (int) Math.pow((double) (Math.pow(endObj
.getWidth(), 2d) + Math.pow(endObj.getHeight(), 2d)), 1 / 2d) / 2;
xx = endX
- (endX - startX)
* myWidth
/ Math.pow((double) (endX - startX) * (endX - startX)
+ (double) (endY - startY) * (endY - startY), 1 / 2d);
yy = endY
- (endY - startY)
* myHeight
/ (Math.pow((double) (endX - startX) * (endX - startX)
+ (double) (endY - startY) * (endY - startY), 1 / 2d));
xx1 = xx
- 20
* Math.cos(Math.atan(((double) yy - startY)
/ ((double) xx - startX))
- radians(30));
yy1 = yy
- 20
* Math.sin(Math.atan(((double) yy - startY)
/ ((double) xx - startX))
- radians(30));
xx2 = xx
- 20
* Math.sin(radians(60)
- Math.atan(((double) (yy - startY))
/ ((double) (xx - startX))));
yy2 = yy
- 20
* Math.cos(radians(60)
- Math.atan(((double) (yy - startY))
/ ((double) (xx - startX))));
if (startObj.getX() + startObj.getWidth() / 2 > endObj.getX()
+ endObj.getWidth() / 2)
{
xx1 = xx
+ 20
* Math.cos(Math.atan(((double) yy - startY)
/ ((double) xx - startX))
- radians(30));
yy1 = yy
+ 20
* Math.sin(Math.atan(((double) yy - startY)
/ ((double) xx - startX))
- radians(30));
xx2 = xx
+ 20
* Math.sin(radians(60)
- Math.atan(((double) (yy - startY))
/ ((double) (xx - startX))));
yy2 = yy
+ 20
* Math.cos(radians(60)
- Math.atan(((double) (yy - startY))
/ ((double) (xx - startX))));
}
g.fillPolygon(new int[] { (int) xx2, (int) xx1, (int) xx }, new int[] {
(int) yy2, (int) yy1, (int) yy }, 3);
}
/**
* 该函数用于将角度转化为弧度
*/
public double radians(int degrees)
{
return ((double) degrees) * Math.PI / 180.0;
}
// ******************动态图标**************************
class canvas extends Canvas
{
Image im = null;
public canvas(Image im) //类体图形构造器
{
super();
this.setCursor(new Cursor(Cursor.MOVE_CURSOR)); //设置鼠标悬浮样式，设立为移动形态
this.im = im;
//注册鼠标按下事件，用于获取需要绘制的图标对象
this.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
clickcanvas(e);
}
});
/**
* 动态图标键盘事件
*/
this.addKeyListener(new KeyAdapter()
{
public void keyPressed(KeyEvent e)
{
if (e.getKeyCode() == KeyEvent.VK_DELETE)
removecanvas(e);
}
});
/**
* 动态图标鼠标移动和拖动事件
*/
this.addMouseMotionListener(new MouseMotionAdapter()
{
public void mouseDragged(MouseEvent e)
{
movecanvas(e);
}
});
}
/**
* 在两个图标之间绘制线段的同时储存这两个图标以及线段的信息
*/
public void movecanvas(MouseEvent e)
{
Canvas mcan = (Canvas) e.getSource();
int mtop = mcan.getY(), mleft = mcan.getX(), mwidth = mcan
.getWidth(), mheight = mcan.getHeight();
mcan.setBounds(mleft + e.getX() - clickX, mtop + e.getY() - clickY,
mwidth, mheight);
for (int i = 0; i < v.size(); i++)
{
Vector v1 = (Vector) v.elementAt(i);
if (((Canvas[]) v1.elementAt(0))[0].equals(mcan))
{
((int[]) v1.elementAt(1))[0] = mcan.getX();
((int[]) v1.elementAt(1))[1] = mcan.getY();
((int[]) v1.elementAt(1))[2] = mcan.getWidth();
((int[]) v1.elementAt(1))[3] = mcan.getHeight();
}
else if (((Canvas[]) v1.elementAt(0))[1].equals(mcan))
{
((int[]) v1.elementAt(1))[4] = mcan.getX();
((int[]) v1.elementAt(1))[5] = mcan.getY();
((int[]) v1.elementAt(1))[6] = mcan.getWidth();
((int[]) v1.elementAt(1))[7] = mcan.getHeight();
}
}
((applet7) this.getParent()).repaint();
}
/**
* 删除图标以及相关连的线段
*/
public void removecanvas(KeyEvent e)
{
try
{
Canvas mcan = (Canvas) e.getSource();
((applet7) this.getParent()).remove(curdelcan);
for (int i = v.size() - 1; i >= 0; i--)
{
Vector v1 = (Vector) v.elementAt(i);
if (((Canvas[]) v1.elementAt(0))[0].equals(mcan)
|| ((Canvas[]) v1.elementAt(0))[1].equals(mcan))
v.removeElementAt(i);
}
((applet7) this.getParent()).validate();
((applet7) this.getParent()).repaint();
}
catch (NullPointerException ex)
{
return;
}
}
/**
* 鼠标拖动图标是改变对象位置以及对象相关连线
*/
public void clickcanvas(MouseEvent e)
{
curdelcan = (Canvas) e.getSource();
clickX = e.getX();
clickY = e.getY();
((applet7) this.getParent()).repaint();
if (((applet7) this.getParent()).drawclear.equals(""))
return;
if (((applet7) this.getParent()).startObj == null
&& ((applet7) this.getParent()).endObj == null)
((applet7) this.getParent()).startObj = (Canvas) e.getSource();
else if (((applet7) this.getParent()).startObj != null
&& ((applet7) this.getParent()).endObj == null
&& ((applet7) this.getParent()).startObj != (Canvas) e
.getSource())
{
((applet7) this.getParent()).endObj = (Canvas) e.getSource();
Vector v1 = new Vector();
v1.addElement(new Canvas[] { startObj, endObj });
v1.addElement(new int[] { startObj.getX(), startObj.getY(),
startObj.getWidth(), startObj.getHeight(), endObj.getX
(), endObj.getY(), endObj.getWidth(),
endObj.getHeight() });
v.addElement(v1);
((applet7) this.getParent()).drawclear = "";
((applet7) this.getParent()).drawLine.setBackground(null);
((applet7) this.getParent()).startObj = null;
((applet7) this.getParent()).endObj = null;
}
}
/**
* 画出动态图标
*/
public void paint(Graphics g)
{
g.drawImage(im, 0, 0, this);
}
}
// ***********************工具栏图标*****************************
class myCanvas extends Canvas
{
private static final long serialVersionUID = 1L;
Image im = null;
String str = "";
/**
* 文字构造器
*/
public myCanvas(String s)
{
super();
this.str = s;
}
/**
* 图象构造器
*/
public myCanvas(Image im)
{
super();
this.setCursor(new Cursor(Cursor.HAND_CURSOR)); //设置鼠标悬浮时的样式，这里为手型
this.im = im;
this.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
clickmyCanvas(e);
}
});
}
/**
* 每一个图标单击事件
*/
public void clickmyCanvas(MouseEvent e)
{
((applet7) this.getParent().getParent()).drawLine.setBackground(null); //恢复线形图标的默认背景
((applet7) this.getParent().getParent()).drawclear = ""; //让线形图标初始化
((applet7) this.getParent().getParent()).startObj = null; //初始化绘制线段的开始对象
((applet7) this.getParent().getParent()).endObj = null; //初始化绘制线段的结束对象
curcan = (Canvas) e.getSource(); //获取当前图标对象
curimg = (Image) im; //获取当前图标对象的图象
}
public void paint(Graphics g)
{
if (str.equals(""))
{
g.drawImage(im, 0, 0, this); //画图，工具图标
}
else
{
g.drawString(str, 20, getHeight() / 2); //文字，线型图标"drawline"
}
}
}
}
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