用java代碼畫畫軟件用java代碼畫畫軟件教程

用JAVA做個(gè)畫筆，有畫筆和橡皮功能就行。越簡(jiǎn)單越好

新建一個(gè)java文件,取名叫做PaintJava.java

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代碼如下:

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;//畫筆大小

int Econ = 5;//橡皮大小

int toolFlag = 0;//toolFlag:工具標(biāo)記

//toolFlag工具對(duì)應(yīng)表：

//（0--畫筆）；（1--橡皮）；（2--清除）；

//（3--直線）；（4--圓）；（5--矩形）；

Color c = new Color(0,0,0); //畫筆顏色

BasicStroke size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);//畫筆粗細(xì)

Point cutflag = new Point(-1, -1, c, 6, con);//截?cái)鄻?biāo)志

Vector paintInfo = null;//點(diǎn)信息向量組

int n = 1;

FileInputStream picIn = null;

FileOutputStream picOut = null;

ObjectInputStream VIn = null;

ObjectOutputStream VOut = null;

// *工具面板--畫筆，直線，圓，矩形，多邊形,橡皮，清除*/

Panel toolPanel;

Button eraser, drLine,drCircle,drRect;

Button clear ,pen;

Choice ColChoice,SizeChoice,EraserChoice;

Button colchooser;

Label 顏色,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();

/*各工具按鈕及選擇項(xiàng)*/

//顏色選擇

ColChoice = new Choice();

ColChoice.add("black");

ColChoice.add("red");

ColChoice.add("blue");

ColChoice.add("green");

ColChoice.addItemListener(this);

//畫筆大小選擇

SizeChoice = new Choice();

SizeChoice.add("1");

SizeChoice.add("3");

SizeChoice.add("5");

SizeChoice.add("7");

SizeChoice.add("9");

SizeChoice.addItemListener(this);

//橡皮大小選擇

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("畫筆");

drLine = new Button("畫直線");

drCircle = new Button("畫圓形");

drRect = new Button("畫矩形");

openPic = new Button("打開圖畫");

savePic = new Button("保存圖畫");

colchooser = new Button("顯示調(diào)色板");

//各組件事件監(jiān)聽

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);

顏色 = new Label("畫筆顏色",Label.CENTER);

大小B = new Label("畫筆大小",Label.CENTER);

大小E = new Label("橡皮大小",Label.CENTER);

//面板添加組件

toolPanel.add(openPic);

toolPanel.add(savePic);

toolPanel.add(pen);

toolPanel.add(drLine);

toolPanel.add(drCircle);

toolPanel.add(drRect);

toolPanel.add(顏色); 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,"打開圖畫",FileDialog.LOAD);

openPicture.setVisible(false);

savePicture = new FileDialog(this,"保存圖畫",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=0; in ;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://畫筆

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://畫直線

Line2D line2 = new Line2D.Double(p1.x, p1.y, p2.x, p2.y);

g2d.draw(line2);

break;

case 4://畫圓

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://畫矩形

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?cái)?，跳過

i=i+1;

break;

default :

}//end switch

}//end if

}//end for

}

public void itemStateChanged(ItemEvent e)

{

if(e.getSource()==ColChoice)//預(yù)選顏色

{

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)//畫筆大小

{

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://畫筆

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://直線

x = (int)e.getX();

y = (int)e.getY();

p2 = new Point(x, y, c, toolFlag, con);

paintInfo.addElement(p2);

break;

case 4: //圓

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://畫筆

paintInfo.addElement(cutflag);

break;

case 1: //eraser

paintInfo.addElement(cutflag);

break;

case 3://直線

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: //圓

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)//畫筆

{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)//畫線

{toolFlag = 3;}

if(e.getSource()==drCircle)//畫圓

{toolFlag = 4;}

if(e.getSource()==drRect)//畫矩形

{toolFlag = 5;}

if(e.getSource()==colchooser)//調(diào)色板

{

Color newColor = JColorChooser.showDialog(this,"調(diào)色板",c);

c = newColor;

}

if(e.getSource()==openPic)//打開圖畫

{

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)//保存圖畫

{

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("畫圖程序"); }

}

累啊..給分吧...!!

用java編寫畫圖工具

要求比較多阿給你個(gè)簡(jiǎn)單的供參考

import java.awt.*;

import java.awt.event.*;

class Mycanvas extends Canvas

{ int x,y,r;

Mycanvas()

{ setBackground(Color.cyan);

}

public void setX(int x)

{ this.x=x;

}

public void setY(int y)

{ this.y=y;

}

public void setR(int r)

{ this.r=r;

}

public void paint(Graphics g)

{ g.drawOval(x,y,2*r,2*r); //通過Graphics對(duì)象畫圓

}

class WindowCanvas extends Frame implements ActionListener

{ Mycanvas canvas;

TextField inputR,inputX,inputY;

Button b;

WindowCanvas()

{ canvas=new Mycanvas();//創(chuàng)建畫布對(duì)象

inputR=new TextField(5);

inputX=new TextField(4);

inputY=new TextField(4);

Panel pNorth=new Panel(), pSouth=new Panel();//創(chuàng)建兩個(gè)面板

pNorth.add(new Label("圓的位置坐標(biāo)："));

pNorth.add(inputX);

pNorth.add(inputY);

pSouth.add(new Label("圓的半徑："));

pSouth.add(inputR);

b=new Button("確定");

b.addActionListener(this);

pSouth.add(b);

add(canvas,BorderLayout.CENTER); //添加畫布對(duì)象到中央?yún)^(qū)域

add(pNorth,BorderLayout.NORTH);

add(pSouth,BorderLayout.SOUTH);

setBounds(100,100,300,200);

setVisible(true);

}

public void actionPerformed(ActionEvent e)

{ int x,y,r;

try { x=Integer.parseInt(inputX.getText());

y=Integer.parseInt(inputY.getText());

r=Integer.parseInt(inputR.getText());

canvas.setX(x); //設(shè)置自定義畫布對(duì)象的實(shí)例變量x

canvas.setY(y);//設(shè)置自定義畫布對(duì)象的實(shí)例變量y

canvas.setR(r);//設(shè)置自定義畫布對(duì)象的實(shí)例變量r

canvas.repaint();//重畫自定義畫布對(duì)象

}

catch(NumberFormatException ee)

{ x=0;y=0;r=0;

}

public class Example18

{ public static void main(String args[])

{ new WindowCanvas();

}

請(qǐng)問如何用java編寫一個(gè)軟件，可以在上面畫一些圖形（比如矩形），然后可以選中，并移動(dòng)甚至放大或者縮小它

給你說下思想

第一種:

用到2個(gè)簡(jiǎn)單面板

第一個(gè)面板放到內(nèi)容面板的中心區(qū)域(設(shè)置成流式布局)

第二個(gè)面板放到第一個(gè)面板里面(畫矩形)

給面板2注冊(cè)監(jiān)聽器(鼠標(biāo))

后面的自己構(gòu)思吧

放大或者縮小根據(jù)面板的中心

第二種思想就是直接利用多文檔技術(shù)

求一個(gè)java程序：繪圖程序包括畫圓，橢圓，線，矩形，自定義。并且可以調(diào)圖形顏色！

public?enum?ShapeTypes?{

LINE,?CIRCLE,?RECTANGLE

}

public?interface?Shape?{

void?paint(Graphics?g);

}

public?class?Rectangle?implements?Shape?{

//?矩形左上角的坐標(biāo)

private?int?x,?y;

//?矩形的寬度和高度

private?int?width,?height;

private?Color?rectangleColor;

public?Rectangle()?{

super();

}

public?Rectangle(int?x,?int?y,?int?width,?int?height,?Color?rectangleColor)?{

super();

this.x?=?x;

this.y?=?y;

this.width?=?width;

this.height?=?height;

this.rectangleColor?=?rectangleColor;

}

@Override

public?void?paint(Graphics?g)?{

g.setColor(rectangleColor);

g.drawRect(x,?y,?width,?height);

}

public?class?Line?implements?Shape?{

//?直線的起始位置

private?int?x1,?y1;

//?直線的終止位置

private?int?x2,?y2;

private?Color?lineColor;

public?Line(int?x1,?int?y1,?int?x2,?int?y2,?Color?lineColor)?{

super();

this.x1?=?x1;

this.y1?=?y1;

this.x2?=?x2;

this.y2?=?y2;

this.lineColor?=?lineColor;

}

public?Line()?{

super();

}

@Override

public?void?paint(Graphics?g)?{

g.setColor(lineColor);

g.drawLine(x1,?y1,?x2,?y2);

}

public?class?Circle?implements?Shape?{

//?圓的顏色

private?Color?circleColor;

//?圓心的坐標(biāo)

private?int?x,?y;

//?圓的半徑

private?int?radius;

public?Circle()?{

super();

}

public?Circle(int?x,?int?y,?int?radius,?Color?circleColor)?{

super();

this.circleColor?=?circleColor;

this.x?=?x;

this.y?=?y;

this.radius?=?radius;

}

@Override

public?void?paint(Graphics?g)?{

g.setColor(circleColor);

//?畫弧,?當(dāng)弧的寬度和高度一致且從0~360度時(shí)就是原形了

g.drawArc(x,?y,?radius,?radius,?0,?360);

}

public?class?SketchpadPanel?extends?Canvas?implements?MouseListener,?MouseMotionListener?{

private?static?final?long?serialVersionUID?=?-5229161042153132522L;

//?鼠標(biāo)點(diǎn)擊起始坐標(biāo)和當(dāng)前坐標(biāo)

private?int?beginX?=?0,?beginY?=?0,?currentX?=?0,?currentY?=?0;

//?判斷鼠標(biāo)是否被按下

private?boolean?isMousePressing?=?false;

//?保存當(dāng)前的圖形,?在撤銷和恢復(fù)時(shí)使用

private?final?StackShape?currentShapes?=?new?StackShape();

//?保存已經(jīng)刪除過的圖形

private?final?StackShape?deletedShapes?=?new?StackShape();

private?ShapeTypes?type;

private?Color?color;

public?SketchpadPanel()?{

addMouseListener(this);

addMouseMotionListener(this);

}

/**

?*?撤銷方法

?*/

public?void?undo()?{

if?(currentShapes.size()??0)?{

//?從所有保存過的圖形中取出最后一個(gè),?放入到已刪除的圖形中去

Shape?shape?=?currentShapes.pop();

deletedShapes.push(shape);

repaint();

}

/**

?*?恢復(fù)撤銷方法

?*/

public?void?redo()?{

if?(deletedShapes.size()??0)?{

//?從所有刪除的圖形中取出最后一個(gè),?放入保存的圖形中

Shape?shape?=?deletedShapes.pop();

currentShapes.push(shape);

repaint();

}

/**

?*?設(shè)置命令

?*?

?*?@param?type

?*/

public?void?setShapeType(ShapeTypes?type)?{

this.type?=?type;

}

/**

?*?設(shè)置顏色

?*?

?*?@param?color

?*/

public?void?setColor(Color?color)?{

this.color?=?color;

}

public?void?updete(Graphics?g)?{

paint(g);

}

/**

?*?繪制畫板

?*/

@Override

public?void?paint(Graphics?g)?{

//?繪制畫板

Dimension?size?=?getSize();

int?width?=?size.width;

int?height?=?size.height;

g.setColor(Color.WHITE);

g.fillRect(0,?0,?width,?height);

//?繪制所有圖形

Shape?shape?=?null;

EnumerationShape?e?=?currentShapes.elements();

while?(e.hasMoreElements())?{

shape?=?e.nextElement();

shape.paint(g);

}

//?如果當(dāng)前鼠標(biāo)沒有釋放

if?(isMousePressing)?{

g.setColor(color);

switch?(type)?{

//?繪制直線

case?LINE:

g.drawLine(beginX,?beginY,?currentX,?currentY);

break;

//?繪制矩形

case?RECTANGLE:

if?(currentX??beginX)?{

if?(currentY??beginY)?{

//?如果當(dāng)前位置在起始位置的左上方,?則以鼠標(biāo)當(dāng)前位置為矩形的左上角位置

g.drawRect(currentX,?currentY,?beginX?-?currentX,?beginY?-?currentY);

}?else?{

//?如果當(dāng)前位置在起始位置的左下方,?則以鼠標(biāo)當(dāng)前位置的橫坐標(biāo)和起始位置的縱坐標(biāo)作為矩形的左上角位置

g.drawRect(currentX,?beginY,?beginX?-?currentX,?currentY?-?beginY);

}

}?else?{

if?(currentY??beginY)?{

//?如果當(dāng)前位置在起始位置的右上方,?則以鼠標(biāo)起始位置的很坐標(biāo)和當(dāng)前位置的縱坐標(biāo)作為矩形的左上角位置

g.drawRect(beginX,?currentY,?currentX?-?beginX,?beginY?-?currentY);

}?else?{

//?如果當(dāng)前位置在起始位置的右下方,?則已起始位置作為矩形的左上叫位置

g.drawRect(beginX,?beginY,?currentX?-?beginX,?currentY?-?beginY);

}

break;

//?繪制圓形

case?CIRCLE:

//?半徑為a*a?+?b*b的平方根

int?radius?=?(int)?Math

.sqrt((beginX?-?currentX)?*?(beginX?-?currentX)?+?(beginY?-?currentY)?*?(beginY?-?currentY));

g.drawArc(beginX?-?radius?/?2,?beginY?-?radius?/?2,?radius,?radius,?0,?360);

break;

}

@Override

public?void?mouseClicked(MouseEvent?e)?{

}

@Override

public?void?mouseEntered(MouseEvent?e)?{

}

@Override

public?void?mouseExited(MouseEvent?e)?{

}

/**

?*?當(dāng)鼠標(biāo)按下的時(shí)候獲得起始坐標(biāo)

?*/

@Override

public?void?mousePressed(MouseEvent?e)?{

beginX?=?e.getX();

beginY?=?e.getY();

isMousePressing?=?true;

}

/**

?*?當(dāng)鼠標(biāo)釋放時(shí)獲得當(dāng)前坐標(biāo)

?*/

@Override

public?void?mouseReleased(MouseEvent?e)?{

currentX?=?e.getX();

currentY?=?e.getY();

isMousePressing?=?false;

//?當(dāng)釋放鼠標(biāo)時(shí),?將繪制的圖形保存到shapes中

switch?(type)?{

//?繪制直線

case?LINE:

Line?line?=?new?Line(beginX,?beginY,?currentX,?currentY,?color);

currentShapes.push(line);

break;

//?繪制圓形

case?CIRCLE:

//?半徑為a*a?+?b*b的平方根

int?radius?=?(int)?Math

.sqrt((beginX?-?currentX)?*?(beginX?-?currentX)?+?(beginY?-?currentY)?*?(beginY?-?currentY));

Circle?circle?=?new?Circle(beginX?-?radius?/?2,?beginY?-?radius?/?2,?radius,?color);

currentShapes.push(circle);

break;

//?繪制矩形

case?RECTANGLE:

Rectangle?rectangle?=?null;

if?(currentX??beginX)?{

if?(currentY??beginY)?{

rectangle?=?new?Rectangle(currentX,?currentY,?beginX?-?currentX,?beginY?-?currentY,?color);

}?else?{

rectangle?=?new?Rectangle(currentX,?beginY,?beginX?-?currentX,?currentY?-?beginY,?color);

}

}?else?{

if?(currentY??beginY)?{

rectangle?=?new?Rectangle(beginX,?currentY,?currentX?-?beginX,?beginY?-?currentY,?color);

}?else?{

rectangle?=?new?Rectangle(beginX,?beginY,?currentX?-?beginX,?currentY?-?beginY,?color);

}

currentShapes.push(rectangle);

break;

}

repaint();

}

@Override

public?void?mouseDragged(MouseEvent?e)?{

currentX?=?e.getX();

currentY?=?e.getY();

this.repaint();

}

@Override

public?void?mouseMoved(MouseEvent?e)?{

}

public?class?SketchpadFrame?extends?JFrame?{

private?static?final?long?serialVersionUID?=?-7080053971741609904L;

private?final?JPanel?commandPanel?=?new?JPanel();?//?存放命令的面板

private?final?JPanel?colorPanel?=?new?JPanel();?//?存放顏色的面板

private?final?JPanel?mainPanel?=?new?JPanel();?//?主面板

private?final?JButton?redButton?=?new?JButton("紅色");

private?final?JButton?blueButton?=?new?JButton("藍(lán)色");

private?final?JButton?greenButton?=?new?JButton("綠色");

private?final?JButton?lineButton?=?new?JButton("直線");

private?final?JButton?circleButton?=?new?JButton("圓");

private?final?JButton?rectangleButton?=?new?JButton("矩形");

private?final?JButton?undoButton?=?new?JButton("撤銷");

private?final?JButton?redoButton?=?new?JButton("恢復(fù)撤銷");

private?final?JButton?exitButton?=?new?JButton("退出");

SketchpadPanel?sketchPanel?=?new?SketchpadPanel();

private?void?initFrame()?{

commandPanel.setLayout(new?FlowLayout());

commandPanel.add(lineButton);

commandPanel.add(circleButton);

commandPanel.add(rectangleButton);

commandPanel.add(undoButton);

commandPanel.add(redoButton);

commandPanel.add(exitButton);

colorPanel.setLayout(new?FlowLayout());

colorPanel.add(redButton);

colorPanel.add(blueButton);

colorPanel.add(greenButton);

mainPanel.setLayout(new?BorderLayout());

mainPanel.add(commandPanel,?BorderLayout.NORTH);

mainPanel.add(colorPanel,?BorderLayout.CENTER);

getContentPane().add("South",?mainPanel);

getContentPane().add("Center",?sketchPanel);

//?初始化設(shè)置:顏色和命令

lineButton.setForeground(Color.RED);

sketchPanel.setColor(Color.RED);

redButton.setForeground(Color.RED);

sketchPanel.setShapeType(ShapeTypes.LINE);

}

private?void?initListener()?{

redButton.addActionListener(new?ActionListener()?{

@Override