2.根据BufferedImage类得到一个Graphics2D对象
3.根据Graphics2D对象进行逻辑 *** 作
4.处理绘图
5.将绘制好的图片写入到图片
import java.applet.*import java.awt.*
import java.awt.event.*
import java.util.*
import javax.swing.*
import java.awt.geom.*
import java.io.*
import java.sql.Connection
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()
{
@Override
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=0 i<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()
switch (name) {
case "black":
c = new Color(0,0,0)
break
case "red":
c = new Color(255,0,0)
break
case "green":
c = new Color(0,255,0)
break
case "blue":
c = new Color(0,0,255)
break
}
}
else if(e.getSource()==SizeChoice)//画笔大小
{
String selected = SizeChoice.getSelectedItem()
switch (selected) {
case "1":
con = 1
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL)
break
case "3":
con = 3
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL)
break
case "5":
con = 5
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL)
break
case "7":
con = 7
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL)
break
case "9":
con = 9
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL)
break
}
}
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") }
}
下面是我以前做的小程序，希望能给你点帮助！package menu
import java.awt.*
import java.awt.event.*
import javax.swing.*
public class DaYin extends JFrame implements ActionListener{
public DaYin() {
Container c=this.getContentPane()
c.setLayout(new BorderLayout())
JMenuBar jmb=new JMenuBar()
JMenu jm=null
jm=new JMenu("文件")
jmb.add(jm)
jm=new JMenu("编辑")
jmb.add(jm)
jm=new JMenu("打印")
JMenuItem jmi=new JMenuItem("打印预览")
jmi.addActionListener(this)
jm.add(jmi)
jmb.add(jm)
jm=new JMenu("帮助")
jmb.add(jm)
this.setJMenuBar(jmb)
this.setSize(1024,768)
this.setVisible(true)
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0)
}
})
}
public static void main(String[] args) {
new DaYin()
}
public void update(Graphics g){
g.setColor(Color.black)
String title[]={"摘要","科目","子目或户名","借方金额","贷方金额"}
String danwei[]={"千","百","十","万","千","百","十","元","角","分"}
int csx=200//打印x的初始坐标
int csy=200//打印y的初始坐标
int x=csx
int y=csy
int a=x+20//打印字体x的初始坐标
int b=y+20//打印字体y的初始坐标
int row=7//一共打印出几条横线
int cul=5//一共打印出几条竖线
int hangju=30//线与线之间的纵向间距
int lieju=100//线与线之间的横向间距
int yy=hangju*row+y
int c=yy+20
g.setFont(new Font("行楷",Font.TYPE1_FONT,24))
g.drawString("记 账 凭 证", x+160, y-40)//打印出记账凭证这几个字
g.drawLine(x+100, y-30, x+340, y-30)//打印出记账凭证下面的那条线
g.setFont(new Font("行楷",Font.TYPE1_FONT,13))
g.drawString("年 月 日 第_______号", x+260, y-10)
//g.drawLine(x+430, y-10, x+470, y-10)
for(int i=0i<=rowi++){
g.drawLine(x, y, cul*lieju+x+25, y)//此循环用于画出表格的行
if(i==0)
y+=hangju*2
else
y+=hangju
}
y=csy
g.drawLine(x+lieju*3, y+hangju, cul*lieju+x, y+hangju)//打印出第一行半的横线
for(int j=0j<=culj++){
g.drawLine(x, y, x, row*hangju+y)//此循环用于画出表格的列
x+=lieju
}
x=csx
for(int z=0z<culz++){
g.setColor(Color.red)//设置颜色
g.setFont(new Font("",Font.TYPE1_FONT,13))//设置表头字体
if(z<3)
g.drawString(title[z], a, b+hangju/2)
else
g.drawString(title[z], a, b)//为表格添加表头
a+=lieju
}//76-89打印出一个表格形状
int xx=lieju*3+x+10
for(int v=0v<=9v++){
g.drawLine(xx, y+hangju, xx, row*hangju+y+hangju)//此循环用于画出表格的列
g.setFont(new Font("",Font.TYPE1_FONT,11))
g.drawString(danwei[v], xx-10, y+hangju+20)//为表格添加表头
if(v%2==0)
g.setColor(Color.red)//设置颜色
else
g.setColor(Color.BLUE)//设置颜色
xx+=10
}
for(int n=0n<9n++){
g.drawLine(xx, y+hangju, xx, row*hangju+y+hangju)//此循环用于画出表格的列
g.drawString(danwei[n],xx-10, y+hangju+20)//为表格添加表头
if(n%2==0)
g.setColor(Color.red)//设置颜色
else
g.setColor(Color.BLUE)//设置颜色
xx+=10
}
g.drawString(danwei[9],xx-10, y+hangju+20)
g.setColor(Color.black)//设置颜色
for(int i=0i<=1i++){
g.drawLine(x,yy , cul*lieju+x, yy)//此循环用于画出表格的行
yy+=hangju
}
yy=hangju*row+y
for(int j=0j<=3j++){
g.drawLine(x, yy, x, (row+1)*hangju+y)//此循环用于画出表格的列
if(j>0){
x+=lieju
}else{
x+=lieju*3
}
}//112-128打印出表格的最后一行单元格
x=csx
g.setFont(new Font("",Font.TYPE1_FONT,13))
g.drawString("合 计",x+60, c)
g.drawString("会计主管 记账 出纳 审核 制证", x+30, yy+50)
g.drawLine(cul*lieju+x+25, y, cul*lieju+x+25, (row+1)*hangju+y)//打印出最后一列
g.drawString("记",cul*lieju+x+6, y+15)
g.drawString("账", cul*lieju+x+6, y+35)
g.drawString("√", cul*lieju+x+6, y+55)//134-136为最后一列写入字体
g.drawString("附",cul*lieju+x+35, y+75)
g.drawString("件", cul*lieju+x+35, y+95)
g.drawString("张", cul*lieju+x+35, y+175)//134-136为最后一列后写入字体
}
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
if(e.getActionCommand().equals("打印预览")){
this.repaint()
}
}
}
使用drawLine()做了一个记账凭证。
执行点击"打印"子菜单"打印预览"就可显示出我们所画的"记账凭证表"
希望这个小程序能够给你点灵感
欢迎分享，转载请注明来源：内存溢出
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