java畫板

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import java.awt.Color;

import java.awt.Cursor;

import java.awt.Graphics;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.util.LinkedList;

import java.util.List;

import javax.swing.JFrame;

import javax.swing.JPanel;

/**功能介紹

* 1.改變線條長度時鼠標形狀的改變(鼠標位于線條兩端時，四種鼠標狀態(tài))

* 2.移動線條時鼠標形狀的改變(鼠標位于線條中間)

* 3.刪除時鼠標形狀的改變

* 4.最后一條直線顏色的不同

* 5.最大化、最小化、窗口大小改變時，線條的重繪

*

*/

public class LineDraw extends JFrame{

/**

*我需要在一個背景下能在任意位置添加線條，

能通過鼠標左鍵拉長，并且如果當鼠標點到直線中央時能拖動線條，當用鼠標右鍵點擊直線時直線能消失。

*/

private LineDrawPanel drawPanel=new LineDrawPanel();

public static void main(String[] args) {

new LineDraw("畫圖面板");

}

public LineDraw(String title) {

super(title);

setBounds(300, 100, 500, 400);

setVisible(true);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

add(drawPanel);

validate();

}

}

class LineDrawPanel extends JPanel{

private int x1;

private int y1;

private Line lastLine;//最后一條線，也是當前正在畫的線，注意線的顏色

private boolean isDrawing;//是否正在畫的標記

private Line moveLine;//正在移動的線條

private Line changeLine;//正在改變長度的線條

private ListLine list=new LinkedListLine();

public LineDrawPanel() {

init();

}

public void init() {

MouseAdapter adapter=new MouseAdapter() {

@Override

public void mousePressed(MouseEvent e) {

if(e.getButton()==MouseEvent.BUTTON1){

x1 = e.getX();

y1 = e.getY();

moveLine=getMoveLine(x1, y1);

if(moveLine!=null){

setCursor(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));

setToolTipText("移動");

return;

}

changeLine=getChangeLine(x1, y1);

if(changeLine!=null){

return;

}

setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));

setToolTipText("畫圖");

isDrawing=true;

}

}

@Override

public void mouseMoved(MouseEvent e) {

Line l=getChangeLine(e.getX(), e.getY());

if(l!=null){//設(shè)置四種鼠標形狀

setToolTipText("變長");

if(Math.abs(l.x1-l.x2)4){

setCursor(Cursor.getPredefinedCursor(Cursor.S_RESIZE_CURSOR));

}

else if(Math.abs(l.y1-l.y2)4){

setCursor(Cursor.getPredefinedCursor(Cursor.E_RESIZE_CURSOR));

}

else{

double k=(l.y1-l.y2)*1.0/(l.x1-l.x2);

if(k=0) setCursor(Cursor.getPredefinedCursor(Cursor.NE_RESIZE_CURSOR));

else setCursor(Cursor.getPredefinedCursor(Cursor.SE_RESIZE_CURSOR));

}

}else{

l=getMoveLine(e.getX(), e.getY());

if(l!=null) {

setCursor(Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));

setToolTipText("移動");

return;

}

l=getDelLine(e.getX(), e.getY());

if(l!=null){

setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));

setToolTipText("右鍵刪除");

}else {

setCursor(Cursor.getDefaultCursor());

}

}

}

@Override

public void mouseDragged(MouseEvent e) {

if(moveLine!=null){

moveLine.move(e.getX()-x1, e.getY()-y1);

x1 = e.getX();

y1 = e.getY();

repaint();

return;

}

if(changeLine!=null){

int xVal=e.getX()-x1;

int yVal=e.getY()-y1;

if(Math.abs(xVal)5||Math.abs(yVal)5)

return;

changeLine.changeLength(xVal,yVal );

x1 = e.getX();

y1 = e.getY();

repaint();

return;

}

if(isDrawing){

int xVal=e.getX()-x1;

int yVal=e.getY()-y1;

if(Math.abs(xVal)3||Math.abs(yVal)3)

return;

lastLine=new Line(x1, y1, e.getX(), e.getY());

repaint();

}

}

@Override

public void mouseReleased(MouseEvent e) {

if(e.getButton()==MouseEvent.BUTTON1){

if(moveLine!=null){//移動

moveLine=null;

repaint();

return;

}

if(changeLine!=null){//改變長度

return;

}

if(isDrawing){//畫線條

isDrawing=false;//重置

lastLine=null;

setCursor(Cursor.getDefaultCursor());

int xVal=e.getX()-x1;

int yVal=e.getY()-y1;

if(Math.abs(xVal)3||Math.abs(yVal)3)

return;

Line l=new Line(x1, y1, e.getX(), e.getY());

list.add(l);

}

}else if(e.getButton()==MouseEvent.BUTTON3){//鼠標右鍵

Line delLine=getDelLine(e.getX(), e.getY());//該刪除的線

if(delLine!=null){

list.remove(delLine);

int size=list.size();

lastLine=(size0?list.get(size-1):null);

repaint();

}

}

}

};

addMouseListener(adapter);//添加鼠標動作事件

addMouseMotionListener(adapter);//添加鼠標移動事件

}

public void paint(Graphics g) {

super.paint(g);//調(diào)用父類的方法

g.setColor(Color.BLUE);

for (Line l:list) {

l.drawLine(g);

}

g.setColor(Color.red);//畫最后一個線條

if(lastLine!=null){

lastLine.drawLine(g);

}else {

if(list.size()0) list.get(list.size()-1).drawLine(g);

}

}

public Line getChangeLine(int x,int y){//獲取能夠改變的直線

for (Line l:list) {

if(l.isCanChange(x,y))

return l;

}

return null;

}

public Line getDelLine(int x,int y){//獲取能夠刪除的直線

for (Line l:list) {

if(l.isCanDel(x,y))

return l;

}

return null;

}

public Line getMoveLine(int x,int y){//獲取能夠移動的直線

for (Line l:list) {

if(l.isCanMove(x, y))

return l;

}

return null;

}

}

class Line{

public int x1;

public int y1;

public int x2;

public int y2;

public static boolean isStart;//決定改變的線條的那一端

public Line(int x1, int y1, int x2, int y2) {

this.x1 = x1;

this.y1 = y1;

this.x2 = x2;

this.y2 = y2;

}

public void drawLine(Graphics g){

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

}

public void move(int xVal,int yVal){//線條移動

x1+=xVal;

x2+=xVal;

y1+=yVal;

y2+=yVal;

}

public void changeLength(int xVal,int yVal){//改變長度 (該算法有點問題)

if(x1==x2){

xVal=0;

}else {

double k=(y1-y2)*1.0/(x1-x2);

System.out.println(k);

yVal=(int) Math.round(k*xVal);

}

if(isStart){

x1+=xVal;

y1+=yVal;

}else {

x2+=xVal;

y2+=yVal;

}

//x1=(x10?0:x1);

//y1=(y10?0:y1);

}

public boolean isLineValue(){//判斷所畫的線條是否有效

int len2=(x1-x2)*(x1-x2)+(y1-y2)*(y1-y2);

if(len2==0) return false;

if(Math.sqrt(len2)=1)//長度小于1的，視為無效線條

return false;

return true;

}

public boolean isCanDel(int x,int y){//線條是否可被刪除

int sideA2=(x-x1)*(x-x1)+(y-y1)*(y-y1);

int sideB2=(x-x2)*(x-x2)+(y-y2)*(y-y2);

int sideC2=(x1-x2)*(x1-x2)+(y1-y2)*(y1-y2);

if(sideA2==0||sideB2==0)return true;

double cosC=(sideA2+sideB2-sideC2)/(2*Math.sqrt(sideA2*sideB2));

if(cosC-0.99) return true;

return false;

}

public boolean isCanChange(int x,int y){//線條是否可改變長度，僅鼠標位于線條兩端時才可改變

if(Math.abs(x1-x)2Math.abs(y1-y)2){

isStart=true;

return true;

}

if(Math.abs(x2-x)2Math.abs(y2-y)2){

isStart=false;

return true;

}

return false;

}

public boolean isCanMove(int x,int y){//線條是否可移動

int midX=(x1+x2)/2;

int midY=(y1+y2)/2;

//if(midX==xmidY==y) return false;

if(Math.abs(midX-x)5Math.abs(midY-y)5)

return true;

return false;

}

}

我想用java編寫一個程序，就是能在畫板上實現(xiàn)填加一段字符串，最好能提供代碼

import?java.awt.*;

/**

*?@author?Hardneedl

*/

interface?Brush?{

void?doPaint(Graphics?g);

}

import?javax.swing.*;

import?javax.swing.event.*;

import?java.awt.*;

/**

*?@author?Hardneedl

*/

final?class?StringPaintDemo?extends?JFrame?{

public?String?getTitle()?{return?"String?Paint";}

static?private?final?Dimension?size?=?new?Dimension(600,?400);

public?Dimension?getPreferredSize()?{return?size;}

public?Dimension?getMaximumSize()?{return?size;}

public?Dimension?getMinimumSize()?{return?size;}

public?Dimension?getSize()?{return?size;}

private?String?s;

private?Brush?stringBrush?=?new?Brush()?{

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

Graphics?gg?=?g.create();

gg.setColor(Color.RED);

gg.drawString(s?==?null???"null"?:?s?,?58,?58);

gg.dispose();

}

};

private?JTextField?txtField;

private?JComponent?canvas?=?new?JComponent(){

protected?void?paintComponent(Graphics?g)?{

super.paintComponent(g);

stringBrush.doPaint(g);

}

};

private?StringPaintDemo()?throws?HeadlessException?{

init();

attachListeners();

doLay();

}

private?void?init()?{

txtField?=?new?JTextField();

}

private?void?attachListeners()?{

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

txtField.getDocument().addDocumentListener(new?DocumentListener(){

private?void?update(){

s?=?txtField.getText();

canvas.paintImmediately(canvas.getBounds());

}

public?void?changedUpdate(DocumentEvent?e)?{update();}

public?void?insertUpdate(DocumentEvent?e)?{update();}

public?void?removeUpdate(DocumentEvent?e)?{update();}

});

}

private?void?doLay()?{

Container?container?=?getContentPane();

container.add(txtField,BorderLayout.NORTH);

container.add(canvas,?BorderLayout.CENTER);

pack();

setVisible(true);

}

public?static?void?main(String[]?args)?{

SwingUtilities.invokeLater(new?Runnable()?{

public?void?run()?{

new?StringPaintDemo();

}

});

}

}

請用JAVA代碼制作一個簡單的畫板，其中有五角星，且五角星可以調(diào)整大小和旋轉(zhuǎn)

這樣滿足你的要求么

import?java.awt.Dimension;

import?java.awt.Graphics;

import?java.awt.event.ActionEvent;

import?java.awt.event.ActionListener;

import?javax.swing.JButton;

import?javax.swing.JFrame;

import?javax.swing.JPanel;

public?class?Painter?extends?JFrame{

/**

?*?

?*/

private?static?final?long?serialVersionUID?=?8160427604782702376L;

CanvasPanel?canvas?=?new?CanvasPanel();;

public?Painter()?{

super("Star");

this.add(canvas);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.pack();

this.setResizable(false);

this.setLocationRelativeTo(null);

this.setVisible(true);

}

public?static?void?main(String[]?args)?{

new?Painter();

}

}

class?CanvasPanel?extends?JPanel?implements?ActionListener{

/**

?*?

?*/

private?static?final?long?serialVersionUID?=?-4642528854538741028L;

private?JButton[]?btn?=?new?JButton[4];

private?String[]?btn_name?=?{"+",?"-",?"R",?"L"};

private?int?center_x?=?200,?center_y?=?200,?radius?=?100,?degree?=?0;

public?CanvasPanel()?{

this.setPreferredSize(new?Dimension(400,?500));

this.setLayout(null);

for(int?i?=?0;?i??4;?i++)?{

btn[i]?=?new?JButton(btn_name[i]);

btn[i].setBounds(160?+?i?*?60,?425,?50,?50);

btn[i].addActionListener(this);

this.add(btn[i]);

}

}

@Override

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

super.paintComponent(g);

for(int?i?=?0;?i??5;?i++)?{

g.drawLine(?(int)?(center_x?+?radius?*?Math.sin(Math.toRadians(degree?+?72?*?i))),

(int)?(center_y?-?radius?*?Math.cos(Math.toRadians(degree?+?72?*?i))),

(int)?(center_x?+?radius?*?Math.sin(Math.toRadians(degree?+?72?*?i?+?144))),

(int)?(center_y?-?radius?*?Math.cos(Math.toRadians(degree?+?72?*?i?+?144))));

}

}

public?void?actionPerformed(ActionEvent?e)?{

//?TODO?Auto-generated?method?stub

if(e.getActionCommand()?==?"+")?{

if(radius??200)

radius?+=?2;

repaint();

}?else?if(e.getActionCommand()?==?"-")?{

if(radius??0)

radius?-=?2;

repaint();

}?else?if(e.getActionCommand()?==?"R")?{

degree?=?(degree?+?2)?%?360;

repaint();

}?else?if(e.getActionCommand()?==?"L")?{

degree?=?(degree?-?2)?%?360;

repaint();

}

}

}

求一個簡單的java畫板程序 800行這樣的

看看下面的代碼，新建類T，把代碼拷進去便可運行。

有運行截圖：

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;//畫筆大小

int Econ = 5;//橡皮大小

int toolFlag = 0;//toolFlag:工具標記

//toolFlag工具對應(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

Point cutflag = new Point(-1, -1, c, 6, con);//截斷標志

@SuppressWarnings("unchecked")

Vector paintInfo = null;//點信息向量組

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;

@SuppressWarnings("unchecked")

paintboard(String s)

{

super(s);

addMouseMotionListener(this);

addMouseListener(this);

paintInfo = new Vector();

/*各工具按鈕及選擇項*/

//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");

colchooser = new Button("顯示調(diào)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);

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);

顏色.setBackground(Color.gray);

大小B.setBackground(Color.gray);

大小E.setBackground(Color.gray);

//面板添加組件

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=1; in ;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://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://截斷，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; }

}

}

@SuppressWarnings({"serial","unused", "unchecked"})

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);

}

@SuppressWarnings("unchecked")

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 :

}

}

@SuppressWarnings("unchecked")

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){}

@SuppressWarnings("unchecked")

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;

}

}

}

//end paintboard

public class T{

public static void main(String args[]){

new paintboard("畫圖程序"); }

}

JAVA編譯簡易畫圖板代碼

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:工具標記

//toolFlag工具對應(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

Point cutflag = new Point(-1, -1, c, 6, con);//截斷標志

Vector paintInfo = null;//點信息向量組

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*/

//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://截斷，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 pb

{

public static void main(String args[])

{ new paintboard("畫圖程序"); }

}

java 涂鴉畫板

import?java.awt.BasicStroke;

import?java.awt.BorderLayout;

import?java.awt.Color;

import?java.awt.FlowLayout;

import?java.awt.Frame;

import?java.awt.Graphics;

import?java.awt.Graphics2D;

import?java.awt.Label;

import?java.awt.Panel;

import?java.awt.event.MouseAdapter;

import?java.awt.event.MouseEvent;

import?java.awt.event.MouseMotionListener;

import?java.awt.event.WindowAdapter;

import?java.awt.event.WindowEvent;

public?class?MouseDrawPanel?extends?Frame

{

private?static?final?long?serialVersionUID?=?1L;

MouseEvent?e?=?null;

int?startX?=?-1;

int?startY?=?-1;

int?endX?=?-1;

int?endY?=?-1;

boolean?left?=?false;

public?MouseDrawPanel?(?String?title?)

{

setTitle?(title);

setLayout?(new?BorderLayout?());

setResizable?(false);

setSize?(500,?400);

setLocationRelativeTo?(null);

addWindowListener?(new?WindowAdapter?()

{

@Override

public?void?windowClosing?(?WindowEvent?e?)

{

System.exit?(0);

}

});

}

@Override

public?void?paintComponents?(?Graphics?g?)

{

float?lineWidth?=?8.0f;

(?(Graphics2D)?g?).setStroke?(new?BasicStroke?(lineWidth));

g.setColor?(Color.YELLOW);

g.drawLine?(startX,?startY,?endX,?endY);

g.dispose?();

}

public?static?void?main?(?String[]?args?)

{

final?MouseDrawPanel?mdp?=?new?MouseDrawPanel?("Use?Mouse?Draw");

Panel?panel?=?new?Panel?();

panel.setLayout?(new?FlowLayout?(FlowLayout.LEFT));

Label?startL?=?new?Label?("start:?");

Label?endL?=?new?Label?("end:?");

final?Label?nowL?=?new?Label?("now:?");

final?Label?startR?=?new?Label?("000,000");

final?Label?endR?=?new?Label?("000,000");

final?Label?nowN?=?new?Label?("000,000");

panel.add?(startL);

panel.add?(startR);

panel.add?(endL);

panel.add?(endR);

panel.add?(nowL);

panel.add?(nowN);

mdp.add?(panel,?"South");

mdp.addMouseMotionListener?(new?MouseMotionListener?()

{

@Override

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

{

if?(mdp.left)

{

nowN.setText?(e.getX?()?+?"?,?"?+?e.getY?());

}

}

@Override

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

{

if?(mdp.left)

{

mdp.endX?=?e.getX?();

mdp.endY?=?e.getY?();

mdp.paintComponents?(mdp.getGraphics?());

mdp.startX?=?mdp.endX;

mdp.startY?=?mdp.endY;

endR.setText?(mdp.endX?+?"?,?"?+?mdp.endY);

}

}

});

mdp.addMouseListener?(new?MouseAdapter?()

{

@Override

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

{

if?(e.getButton?()?==?MouseEvent.BUTTON1)

{

mdp.startX?=?e.getX?();

mdp.startY?=?e.getY?();

startR.setText?(mdp.startX?+?"?,?"?+?mdp.startY);

mdp.left?=?true;

}

else

{

mdp.left?=?false;

}

}

@Override

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

{

if?(mdp.left)

{

endR.setText?(e.getX?()?+?"?,?"?+?e.getY?());

}

}

});

mdp.setVisible?(true);

}

}