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用JAVA做个画笔，有画笔和橡皮功能就行。越简单越好

键盘锁 • 2023-4-13 • 软件运维 • 阅读 30

用JAVA做个画笔，有画笔和橡皮功能就行。越简单越好,第1张

新建一个java文件,取名叫做PaintJava.java

代码如下:

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 con = 1//画笔大小

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 PaintJava

{

public static void main(String args[])

{ new paintboard("画图程序")}

}

累啊..给分吧...!!

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

Graphics这个是抽象类，它的对象是用来传给paint（）方法作为画笔的，示例程序如下：\x0d\x0a\x0d\x0aimportjava.awt.*//引入的包，Graphics所在的包\x0d\x0a\x0d\x0apublicclassTestGraphicsextendsFrame{\x0d\x0a\x0d\x0apublicstaticvoidmain(String[]args){\x0d\x0aTestGraphicsgp=newTestGraphics()\x0d\x0agp.setBounds(300,300,100,100)\x0d\x0agp.setVisible(true)\x0d\x0a}\x0d\x0a/*下面的方法用的Graphics的对象g作为paint方法的参数\x0d\x0apublicvoidpaint(Graphicsg){\x0d\x0aColorc=g.getColor()\x0d\x0ag.fillOval(100,100,50,50)\x0d\x0ag.setColor(c)\x0d\x0a}\x0d\x0a}

欢迎分享，转载请注明来源：内存溢出

原文地址: http://outofmemory.cn/yw/8117690.html

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