还有copy自闹搜己不知道算不算复制。。。-_-!
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楼主给你一个我的，直接保存成pb.java编译运行，就是你要的画图功能 ，可以参考一下虚困
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import java.applet.*
import java.awt.*
import java.awt.event.*
import java.util.*
import javax.swing.*
import java.awt.geom.*
import java.io.*
class Point implements Serializable
{
int x,y
Color col
int tool
int boarder
Point(int x, int y, Color col, int tool, int boarder)
{
this.x = x
this.y = y
this.col = col
this.tool = tool
this.boarder = boarder
}
}
class paintboard extends Frame implements ActionListener,MouseMotionListener,MouseListener,ItemListener
{
int x = -1, y = -1
int Econ = 5//橡皮大小
int toolFlag = 0//toolFlag:工具标记
//toolFlag工具对应表：
//（0--画笔）；（1--橡皮）；（2--清除）；
//（3--直线）；（4--圆）；（5--矩形）；
Color c = new Color(0,0,0)//画笔颜色
BasicStroke size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL)//画笔粗细
Point cutflag = new Point(-1, -1, c, 6, con)//截断标志
Vector paintInfo = null//点信息向量组
int n = 1
FileInputStream picIn = null
FileOutputStream picOut = null
ObjectInputStream VIn = null
ObjectOutputStream VOut = null
// *工具面板--画笔，直线，圆，矩形，多边形,橡皮，清除*/
Panel toolPanel
Button eraser, drLine,drCircle,drRect
Button clear ,pen
Choice ColChoice,SizeChoice,EraserChoice
Button colchooser
Label 颜色,大小B,大小E
//保存功能
Button openPic,savePic
FileDialog openPicture,savePicture
paintboard(String s)
{
super(s)
addMouseMotionListener(this)
addMouseListener(this)
paintInfo = new Vector()
/*各工具按钮及选择项*/
//颜色选择
ColChoice = new Choice()
ColChoice.add("black")
ColChoice.add("red")
ColChoice.add("blue")
ColChoice.add("green")
ColChoice.addItemListener(this)
//画笔大小选择
SizeChoice = new Choice()
SizeChoice.add("1")
SizeChoice.add("3")
SizeChoice.add("5")
SizeChoice.add("7")
SizeChoice.add("9")
SizeChoice.addItemListener(this)
//橡皮大小选择
EraserChoice = new Choice()
EraserChoice.add("5")
EraserChoice.add("9")
EraserChoice.add("13")
EraserChoice.add("17")
EraserChoice.addItemListener(this)
////////////////////////////////////////////////////
toolPanel = new Panel()
clear = new Button("清除")
eraser = new Button("橡皮")
pen = new Button("画笔")
drLine = new Button("画直线")
drCircle = new Button("画圆形")
drRect = new Button("画矩形")
openPic = new Button("打开图画")
savePic = new Button("保存图画")
colchooser = new Button("显示调色板")
//各组件事件监听
clear.addActionListener(this)
eraser.addActionListener(this)
pen.addActionListener(this)
drLine.addActionListener(this)
drCircle.addActionListener(this)
drRect.addActionListener(this)
openPic.addActionListener(this)
savePic.addActionListener(this)
colchooser.addActionListener(this)
颜色 = new Label("画笔颜色",Label.CENTER)
大小B = new Label("画笔大小",Label.CENTER)
大小E = new Label("橡皮大小",Label.CENTER)
//面板添加组件
toolPanel.add(openPic)
toolPanel.add(savePic)
toolPanel.add(pen)
toolPanel.add(drLine)
toolPanel.add(drCircle)
toolPanel.add(drRect)
toolPanel.add(颜色)toolPanel.add(ColChoice)
toolPanel.add(大小B)toolPanel.add(SizeChoice)
toolPanel.add(colchooser)
toolPanel.add(eraser)
toolPanel.add(大小E)toolPanel.add(EraserChoice)
toolPanel.add(clear)
//工具面板到APPLET面板
add(toolPanel,BorderLayout.NORTH)
setBounds(60,60,900,600)setVisible(true)
validate()
//dialog for save and load
openPicture = new FileDialog(this,"打开图画",FileDialog.LOAD)
openPicture.setVisible(false)
savePicture = new FileDialog(this,"保存图画",FileDialog.SAVE)
savePicture.setVisible(false)
openPicture.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{ openPicture.setVisible(false)}
})
savePicture.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{ savePicture.setVisible(false)}
})
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{ System.exit(0)}
})
}
public void paint(Graphics g)
{
Graphics2D g2d = (Graphics2D)g
Point p1,p2
n = paintInfo.size()
if(toolFlag==2)
g.clearRect(0,0,getSize().width,getSize().height)//清除
for(int i=0i<n i++){
p1 = (Point)paintInfo.elementAt(i)
p2 = (Point)paintInfo.elementAt(i+1)
size = new BasicStroke(p1.boarder,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL)
g2d.setColor(p1.col)
g2d.setStroke(size)
if(p1.tool==p2.tool)
{
switch(p1.tool)
{
case 0://画笔
Line2D line1 = new Line2D.Double(p1.x, p1.y, p2.x, p2.y)
g2d.draw(line1)
break
case 1://橡皮
g.clearRect(p1.x, p1.y, p1.boarder, p1.boarder)
break
case 3://画直线
Line2D line2 = new Line2D.Double(p1.x, p1.y, p2.x, p2.y)
g2d.draw(line2)
break
case 4://画圆
Ellipse2D ellipse = new Ellipse2D.Double(p1.x, p1.y, Math.abs(p2.x-p1.x) , Math.abs(p2.y-p1.y))
g2d.draw(ellipse)
break
case 5://画矩形
Rectangle2D rect = new Rectangle2D.Double(p1.x, p1.y, Math.abs(p2.x-p1.x) , Math.abs(p2.y-p1.y))
g2d.draw(rect)
break
case 6://截断，跳过
i=i+1
break
default :
}//end switch
}//end if
}//end for
}
public void itemStateChanged(ItemEvent e)
{
if(e.getSource()==ColChoice)//预选颜色
{
String name = ColChoice.getSelectedItem()
if(name=="black")
{c = new Color(0,0,0)}
else if(name=="red")
{c = new Color(255,0,0)}
else if(name=="green")
{c = new Color(0,255,0)}
else if(name=="blue")
{c = new Color(0,0,255)}
}
else if(e.getSource()==SizeChoice)//画笔大小
{
String selected = SizeChoice.getSelectedItem()
if(selected=="1")
{
con = 1
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL)
}
else if(selected=="3")
{
con = 3
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL)
}
else if(selected=="5")
{con = 5
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL)
}
else if(selected=="7")
{con = 7
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL)
}
else if(selected=="9")
{con = 9
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL)
}
}
else if(e.getSource()==EraserChoice)//橡皮大小
{
String Esize = EraserChoice.getSelectedItem()
if(Esize=="5")
{ Econ = 5*2}
else if(Esize=="9")
{ Econ = 9*2}
else if(Esize=="13")
{ Econ = 13*2}
else if(Esize=="17")
{ Econ = 17*3}
}
}
public void mouseDragged(MouseEvent e)
{
Point p1
switch(toolFlag){
case 0://画笔
x = (int)e.getX()
y = (int)e.getY()
p1 = new Point(x, y, c, toolFlag, con)
paintInfo.addElement(p1)
repaint()
break
case 1://橡皮
x = (int)e.getX()
y = (int)e.getY()
p1 = new Point(x, y, null, toolFlag, Econ)
paintInfo.addElement(p1)
repaint()
break
default :
}
}
public void mouseMoved(MouseEvent e) {}
public void update(Graphics g)
{
paint(g)
}
public void mousePressed(MouseEvent e)
{
Point p2
switch(toolFlag){
case 3://直线
x = (int)e.getX()
y = (int)e.getY()
p2 = new Point(x, y, c, toolFlag, con)
paintInfo.addElement(p2)
break
case 4: //圆
x = (int)e.getX()
y = (int)e.getY()
p2 = new Point(x, y, c, toolFlag, con)
paintInfo.addElement(p2)
break
case 5: //矩形
x = (int)e.getX()
y = (int)e.getY()
p2 = new Point(x, y, c, toolFlag, con)
paintInfo.addElement(p2)
break
default :
}
}
public void mouseReleased(MouseEvent e)
{
Point p3
switch(toolFlag){
case 0://画笔
paintInfo.addElement(cutflag)
break
case 1: //eraser
paintInfo.addElement(cutflag)
break
case 3://直线
x = (int)e.getX()
y = (int)e.getY()
p3 = new Point(x, y, c, toolFlag, con)
paintInfo.addElement(p3)
paintInfo.addElement(cutflag)
repaint()
break
case 4: //圆
x = (int)e.getX()
y = (int)e.getY()
p3 = new Point(x, y, c, toolFlag, con)
paintInfo.addElement(p3)
paintInfo.addElement(cutflag)
repaint()
break
case 5: //矩形
x = (int)e.getX()
y = (int)e.getY()
p3 = new Point(x, y, c, toolFlag, con)
paintInfo.addElement(p3)
paintInfo.addElement(cutflag)
repaint()
break
default:
}
}
public void mouseEntered(MouseEvent e){}
public void mouseExited(MouseEvent e){}
public void mouseClicked(MouseEvent e){}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==pen)//画笔
{toolFlag = 0}
if(e.getSource()==eraser)//橡皮
{toolFlag = 1}
if(e.getSource()==clear)//清除
{
toolFlag = 2
paintInfo.removeAllElements()
repaint()
}
if(e.getSource()==drLine)//画线
{toolFlag = 3}
if(e.getSource()==drCircle)//画圆
{toolFlag = 4}
if(e.getSource()==drRect)//画矩形
{toolFlag = 5}
if(e.getSource()==colchooser)//调色板
{
Color newColor = JColorChooser.showDialog(this,"调色板",c)
c = newColor
}
if(e.getSource()==openPic)//打开图画
{
openPicture.setVisible(true)
if(openPicture.getFile()!=null)
{
int tempflag
tempflag = toolFlag
toolFlag = 2
repaint()
try{
paintInfo.removeAllElements()
File filein = new File(openPicture.getDirectory(),openPicture.getFile())
picIn = new FileInputStream(filein)
VIn = new ObjectInputStream(picIn)
paintInfo = (Vector)VIn.readObject()
VIn.close()
repaint()
toolFlag = tempflag
}
catch(ClassNotFoundException IOe2)
{
repaint()
toolFlag = tempflag
System.out.println("can not read object")
}
catch(IOException IOe)
{
repaint()
toolFlag = tempflag
System.out.println("can not read file")
}
}
}
if(e.getSource()==savePic)//保存图画
{
savePicture.setVisible(true)
try{
File fileout = new File(savePicture.getDirectory(),savePicture.getFile())
picOut = new FileOutputStream(fileout)
VOut = new ObjectOutputStream(picOut)
VOut.writeObject(paintInfo)
VOut.close()
}
catch(IOException IOe)
{
System.out.println("can not write object")
}
}
}
}//end paintboard
public class pb
{
public static void main(String args[])
{ new paintboard("画图程序")}
}
public class MiniDraw implements ActionListener, MouseListener{// Fieldsprivate JFrame frame = new JFrame("MiniDraw")private DrawingCanvas canvas = new DrawingCanvas() private JButton colorButton// the button for colour, so we can change its background to the current color.
private JTextField textField // the field for entering text to put on the canvas// fields for recording the information needed to perform the next action
private enum Action {Line,Rect, Oval, Triangle, Text, Dot, Move, Delete, Push, Pull} private int pressedX //喊衡where the mouse was pressed
private int pressedY //where the mouse was pressed
private Action currentAction = Action.Line
private Color currentColor = Color.black private List<Shape>shapes = new ArrayList <Shape>()
/** Constructor sets up the GUI. */
public MiniDraw(){
frame.setSize(800,600)//The graphics area
canvas.addMouseListener(this)
frame.getContentPane().add(canvas, BorderLayout.CENTER)//The buttons
JPanel topPanel = new JPanel( )
frame.getContentPane().add(topPanel, BorderLayout.NORTH)
JPanel botPanel = new JPanel( )
frame.getContentPane().add(botPanel, BorderLayout.SOUTH)
addButton(topPanel, "New")
addButton(topPanel, "Open")
addButton(topPanel, "Save"穗渗雹)
addButton(topPanel, "Delete")
addButton(topPanel, "Move")
colorButton = addButton(topPanel, "Color") // remember the button so we can change its colour
addButton(topPanel, "猜帆Push")
addButton(topPanel, "Pull")
addButton(topPanel, "Reverse")
addButton(topPanel, "Quit")botPanel.add(new JLabel("Shapes: "))
addButton(botPanel, "Line")
addButton(botPanel, "Rect")
addButton(botPanel, "Oval")
addButton(botPanel, "Triangle")
addButton(botPanel, "Dot")
addButton(botPanel, "Text")
textField = new JTextField("Enter text", 12)
botPanel.add(new JLabel(" : "))
botPanel.add(textField)frame.setVisible(true)
}/** Utility method to make new button and add it to the panel
Returns the button, in case we need it. */
private JButton addButton(JPanel panel, String name){
JButton button = new JButton(name)
button.addActionListener(this)
panel.add(button)
return button
}/** Respond to button presses */public void actionPerformed(ActionEvent e){
String button = e.getActionCommand()
//System.out.printf("Button: %s\n", button) //for debugging
if (button.equals("New") )
newDrawing()
else if (button.equals("Open") )
openDrawing()
else if (button.equals("Save") )
saveDrawing()
else if (button.equals("Color") )
selectColor()
else if (button.equals("Reverse") )
reverseDrawing()
else if (button.equals("Quit") )
frame.dispose()
else{ //
currentAction = Action.valueOf(button) // converts the String to an Action.
}
}/** Sets the current color.
* Also changes the color of the Color button and sets the background color of the canvas */
private void selectColor(){
Color newColor = JColorChooser.showDialog(frame,"Choose Color for new shapes", currentColor)
if (newColor!=null){
currentColor=newColor
colorButton.setBackground(currentColor)
}
}// Respond to mouse events
/** When mouse is pressed, remember the position in order to construct the Shape when
* the mouse is released. */
public void mousePressed(MouseEvent e) {
int x = e.getX()int y = e.getY()
//System.out.printf("Pressed at (%d, %d)\n", x, y) //for debugging
pressedX = x
pressedY = y
}/** When the Mouse is released, depending on the currentAction,
* either construct the shape that was being drawn, or perform the
* action (delete or move) on the shape under the point where the mouse was pressed.*/
public void mouseReleased(MouseEvent e) {
int x = e.getX()int y = e.getY()
//System.out.printf("Released at (%d, %d)\n", x, y) //for debugging
if (currentAction==Action.Move)
moveShape(pressedX, pressedY, x, y)
else if (currentAction==Action.Delete)
deleteShape(x, y)
else if (currentAction==Action.Push)
pushShapeBackward(x, y)
else if (currentAction==Action.Pull)
pullShapeForward(x, y)
else
addShape(pressedX, pressedY, x, y)
}public void mouseClicked(MouseEvent e) {} //needed to satisfy interface
public void mouseEntered(MouseEvent e) {} //needed to satisfy interface
public void mouseExited(MouseEvent e) {} //needed to satisfy interface
// Helper methods for implementing the button and mouse actions
/** Start a new drawing. */
public void newDrawing(){
shapes = new ArrayList<Shape>()
canvas.clear()
}
/** Open a file, and read all the shape descriptions into the current drawing. */
public void openDrawing(){
String fname = FileChooser.open()
if (fname==null) return
try {
Scanner file = new Scanner(new File(fname))
//System.out.printf("Opening file %s\n", fname)
shapes = new ArrayList<Shape>()
while (file.hasNext()){
String shapetype = file.next().toLowerCase()
if (shapetype.equals("oval"))
shapes.add(new Oval(file))
else if (shapetype.equals("rectangle"))
shapes.add(new Rectangle(file))
if (shapetype.equals("line"))
shapes.add(new Line(file))
if (shapetype.equals("textshape"))
shapes.add(new TextShape(file))
else if (shapetype.equals("triangle"))
shapes.add(new Triangle(file))
else if (shapetype.equals("dot"))
shapes.add(new Dot(file))
}
render()
}
catch(IOException e) {
System.out.println(e.getMessage())
e.printStackTrace()
}
}/** Save the current drawing to a file. */
public void saveDrawing(){
String fname =FileChooser.save()
if ( fname == null )
return
try{
PrintStream f = new PrintStream( new File( fname ))
for ( Shape shape : shapes )
f.println( shape.toString())
f.close ()
}
catch(IOException ex){
System.out.println(ex.getMessage())
ex.printStackTrace()
}
}
/** Returns the shape under the position (x y), or null if no such shape */
public Shape findShape(int x, int y){
for (int i = shapes.size()-1i>=0i--){ // must go backwards, so can't use foreach
Shape shape = shapes.get(i)
if (shape.pointOnShape(x, y))
return shape
}
return null // no shape found at position
}
/** Moves the shape that was under the mousePressed position (pressedX, pressedY)
to where the mouse was released.
Ie, move it by (newX-pressedX) and (newY-pressedY)
*/
public void moveShape(int fromX, int fromY, int toX, int toY){
//System.out.printf("Moving shape under (%d, %d) to (%d, %d)\n", pressedX, pressedY, newX, newY) //for debugging
Shape shape = findShape(fromX, fromY)
if (shape!= null)
shape.moveBy((toX-fromX), (toY-fromY))
render()
}/** Deletes the shape that was under the mouseReleased position (x, y)
*/
public void deleteShape(int x, int y){ for ( Shape shape : shapes) {
if ( shape.pointOnShape(x, y ))
shapes.remove ( shape )
}
render()
}
/** Pull the shape under the mouse one position closer to the "front"
of the drawing */
public void pullShapeForward(int x, int y){
// System.out.printf("Pulling shape under (%d, %d) forward\n", x, y) //for debugging
// YOUR CODE HERE
Shape shape = findShape( x, y )
if (shape!=null ) {
int index = shapes.indexOf(shape)
if ( index<shapes.size()-1){
shapes.remove(index)
shapes.add( index+1,shape)
}
render()
}
}
/** Push the shape under the mouse one position further from the "front"
of the drawing */
public void pushShapeBackward(int x, int y){
//System.out.printf("Pushing shape under (%d, %d) backward\n", x, y) //for debugging
// YOUR CODE HERE
Shape shape = findShape(x, y )
if ( shape!=null ){
int index = shapes.indexOf(shape)
if( index >0 )
shapes.remove( index)
shapes.add( index-1, shape)
}
render()
}
/** Reverse the order of the shapes in the drawing */
public void reverseDrawing(){ List<Shape>temp = new ArrayList<Shape>()
while ( shapes.size() >0 ) {
temp.add ( shapes.remove(shapes.size()-1))
}
shapes= temp
render()
}
/** Construct a new Shape object of the appropriate kind (depending on currentAction)
Uses the appropriate constructor of the Line, Rectangle, Oval, TextShape, or Triangle classes.
adds the shape it to the collection of shapes in the drawing, and
renders the shape on the canvas */
public void addShape(int x1, int y1, int x2, int y2){
//System.out.printf("Drawing shape %s, at (%d, %d)-(%d, %d)\n", currentAction, pressedX, pressedY, x, y) //for debugging
Shape shape = null
if (currentAction==Action.Line)
shapes.add(new Line(x1, y1, x2, y2, currentColor))
if (currentAction==Action.Triangle)
shapes.add(new Triangle(x1, y1, x2, y2, currentColor))
if (currentAction==Action.Dot)
shapes.add(new Dot(x2, y2, currentColor))
else if (currentAction==Action.Text)
shapes.add(new TextShape(x2, y2, textField.getText(), currentColor))
else{
int left= Math.min(x1, x2)
int top= Math.min(y1, y2)
int width= Math.abs(x1 - x2)
int height= Math.abs(y1 - y2)
if (currentAction==Action.Rect)
shapes.add(new Rectangle(left, top, width, height, currentColor))
else if (currentAction==Action.Oval)
shapes.add(new Oval(left, top, width, height, currentColor))
}
render()
}public void render(){
canvas.clear(false)
for (Shape shape : shapes){
shape.render(canvas)
}
canvas.display()
}public static void main(String args[]){
new MiniDraw()
}}
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