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")}
}
看看下面的代码胡梁，新建类T，把代码拷进去便可运行。有运行截图：
import java.awt.*
import java.awt.event.*
import java.util.*
import javax.swing.*
import java.awt.geom.*
import java.io.*
@SuppressWarnings({"serial","unused"})
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
}
}
@SuppressWarnings({"serial","unused"})
class paintboard extends Frame implements ActionListener,MouseMotionListener,MouseListener,ItemListener
{
int x = -1, y = -1
int con = 1//画笔大小
int Econ = 5//橡皮裤册运大小
int toolFlag = 0//toolFlag:工具标记
//toolFlag工具对应表：
//（0--画笔）；（1--橡皮）；（2--清除）；
//（3--直线姿早）；（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
@SuppressWarnings("unchecked")
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
@SuppressWarnings("unchecked")
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")
colchooser = new Button("显示调色板")
clear.setBackground(Color.GREEN)
drRect.setBackground(Color.GREEN)
pen.setBackground(Color.GREEN)
eraser.setBackground(Color.GREEN)
drLine.setBackground(Color.GREEN)
drCircle.setBackground(Color.GREEN)
colchooser.setBackground(Color.GREEN)
//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)
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)
颜色.setBackground(Color.gray)
大小B.setBackground(Color.gray)
大小E.setBackground(Color.gray)
//面板添加组件
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=1i<n i++){
p1 = (Point)paintInfo.elementAt(i-1)
p2 = (Point)paintInfo.elementAt(i)
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}
}
}
@SuppressWarnings({"serial","unused", "unchecked"})
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)
}
@SuppressWarnings("unchecked")
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 :
}
}
@SuppressWarnings("unchecked")
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){}
@SuppressWarnings("unchecked")
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
}
}
}
//end paintboard
public class T{
public static void main(String args[]){
new paintboard("画图程序")}
}
package com.example.testimport java.applet.*
import java.awt.*
import java.awt.event.*
public class drawing extends Applet implements ActionListener,
MouseMotionListener {
int x = -1, y = -1, 橡皮擦通知 = 0, 清除通知 = 0
Color c = new Color(255, 0, 0)
int con = 3
Button b_red, b_blue, b_green, 清除, b_quit
public void init() {
addMouseMotionListener(this)
b_red = new Button("画红色图形")
b_blue = new Button("画蓝色图形")
b_green = new Button("画绿色图形")
b_quit = new Button("橡皮")
清除 = new Button("清除")
add(b_red)
add(b_green)
add(b_blue)
add(b_quit)
add(清除)
b_red.addActionListener(this)
b_green.addActionListener(this)
b_blue.addActionListener(this)
b_quit.addActionListener(this)
清除.addActionListener(this)
}
// 画图事件处理
public void paint(Graphics g) {
// 当鼠标的在容器内部（x != -1 &&y != -1）的时候 并且没有点击 橡皮 或者 清除 按钮
/判脊/ 那么根据选择的喊慧颜色画图
if (x != -1 &&y != -1 &&橡皮擦通知 == 0 &&清除通知 == 0) {
g.setColor(c)
g.fillOval(x, y, con, con)
}
// 当点击橡皮的时候 在鼠标移动的时候 清除 鼠郑冲答标当前位置 往X轴和Y轴各10像素的矩形区域
else if (橡皮擦通知 == 1 &&清除通知 == 0) {
g.clearRect(x, y, 10, 10)
}
// 当点击清除的时候 清除整个图形
else if (清除通知 == 1 &&橡皮擦通知 == 0) {
g.clearRect(0, 0, getSize().width, getSize().height)
}
}
// 当鼠标拖动的时候 获得鼠标在画板中的位置 然后调用repaint方法绘制图像，repaint 会调用本类的 update 方法
public void mouseDragged(MouseEvent e) {
x = (int) e.getX()
y = (int) e.getY()
repaint()
}
// 当鼠标移动的时候啥也不做
public void mouseMoved(MouseEvent e) {
}
// 当容器更新的时候 重新绘图 被repaint 内部调用 可以在这里加自己的业务逻辑
public void update(Graphics g) {
// 画图
paint(g)
}
// 自定义按钮的事件处理 当按钮被点击的时候 会调用这个方法 同时传入点击事件 ActionEvent
// ActionEvent 记录了点击的哪个按钮 状态等信息
public void actionPerformed(ActionEvent e) {
// 当点击 画红色图形 的时候改变颜色 这个颜色 被paint方法的画笔使用
if (e.getSource() == b_red) {
橡皮擦通知 = 0
清除通知 = 0
c = new Color(255, 0, 0)
}
// 当点击 画绿色图形 的时候改变颜色 这个颜色 被paint方法的画笔使用
else if (e.getSource() == b_green) {
橡皮擦通知 = 0
清除通知 = 0
c = new Color(0, 255, 0)
}
// 当点击 画蓝色图形 的时候改变颜色 这个颜色 被paint方法的画笔使用
else if (e.getSource() == b_blue) {
橡皮擦通知 = 0
清除通知 = 0
c = new Color(0, 0, 255)
}
// 当点击 橡皮的时候处理
if (e.getSource() == b_quit) {
橡皮擦通知 = 1
清除通知 = 0
}
// 点击 清除的时候处理
if (e.getSource() == 清除) {
清除通知 = 1
橡皮擦通知 = 0
repaint()
}
}
}
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