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画板java

发布时间: 2021-03-17 15:39:13

㈠ java画板

//有问题的话，给我发网络消息

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;

/**功能介绍
* 1.改变线条长度时鼠标形状的改变(鼠标位于线条两端时，四种鼠标状态)
* 2.移动线条时鼠标形状的改变(鼠标位于线条中间)
* 3.删除时鼠标形状的改变
* 4.最后一条直线颜色的不同
* 5.最大化、最小化、窗口大小改变时，线条的重绘
*
*/
public class LineDraw extends JFrame{
/**
*我需要在一个背景下能在任意位置添加线条，
能通过鼠标左键拉长，并且如果当鼠标点到直线中央时能拖动线条，当用鼠标右键点击直线时直线能消失。
*/
private LineDrawPanel drawPanel=new LineDrawPanel();

public static void main(String[] args) {
new LineDraw("画图面板");
}

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;//最后一条线，也是当前正在画的线，注意线的颜色
private boolean isDrawing;//是否正在画的标记
private Line moveLine;//正在移动的线条
private Line changeLine;//正在改变长度的线条

private List<Line> list=new LinkedList<Line>();

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("移动");
return;
}
changeLine=getChangeLine(x1, y1);
if(changeLine!=null){
return;
}
setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
setToolTipText("画图");
isDrawing=true;
}
}
@Override
public void mouseMoved(MouseEvent e) {
Line l=getChangeLine(e.getX(), e.getY());
if(l!=null){//设置四种鼠标形状
setToolTipText("变长");
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("移动");
return;
}
l=getDelLine(e.getX(), e.getY());
if(l!=null){
setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
setToolTipText("右键删除");
}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){//移动
moveLine=null;
repaint();
return;
}
if(changeLine!=null){//改变长度
return;
}
if(isDrawing){//画线条
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){//鼠标右键
Line delLine=getDelLine(e.getX(), e.getY());//该删除的线
if(delLine!=null){
list.remove(delLine);
int size=list.size();
lastLine=(size>0?list.get(size-1):null);
repaint();
}
}
}
};
addMouseListener(adapter);//添加鼠标动作事件
addMouseMotionListener(adapter);//添加鼠标移动事件
}

public void paint(Graphics g) {
super.paint(g);//调用父类的方法
g.setColor(Color.BLUE);
for (Line l:list) {
l.drawLine(g);
}
g.setColor(Color.red);//画最后一个线条
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){//获取能够改变的直线
for (Line l:list) {
if(l.isCanChange(x,y))
return l;
}
return null;
}

public Line getDelLine(int x,int y){//获取能够删除的直线
for (Line l:list) {
if(l.isCanDel(x,y))
return l;
}
return null;
}

public Line getMoveLine(int x,int y){//获取能够移动的直线
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;//决定改变的线条的那一端

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){//线条移动
x1+=xVal;
x2+=xVal;
y1+=yVal;
y2+=yVal;
}

public void changeLength(int xVal,int yVal){//改变长度 (该算法有点问题)
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=(x1<0?0:x1);
//y1=(y1<0?0:y1);
}

public boolean isLineValue(){//判断所画的线条是否有效
int len2=(x1-x2)*(x1-x2)+(y1-y2)*(y1-y2);
if(len2==0) return false;
if(Math.sqrt(len2)<=1)//长度小于1的，视为无效线条
return false;
return true;
}

public boolean isCanDel(int x,int y){//线条是否可被删除
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){//线条是否可改变长度，仅鼠标位于线条两端时才可改变
if(Math.abs(x1-x)<2&&Math.abs(y1-y)<2){
isStart=true;
return true;
}
if(Math.abs(x2-x)<2&&Math.abs(y2-y)<2){
isStart=false;
return true;
}
return false;
}

public boolean isCanMove(int x,int y){//线条是否可移动
int midX=(x1+x2)/2;
int midY=(y1+y2)/2;
//if(midX==x&&midY==y) return false;
if(Math.abs(midX-x)<5&&Math.abs(midY-y)<5)
return true;
return false;
}

}

㈡用JAVA写画板的程序

留下你的邮箱，明天如果有时间我可以写一个很简单的例子给你。但是不会替你实现所有功能。需要你自己触类旁通写出画其他图形的功能实现。

㈢ java 涂鸦画板



importjava.awt.BasicStroke;
importjava.awt.BorderLayout;
importjava.awt.Color;
importjava.awt.FlowLayout;
importjava.awt.Frame;
importjava.awt.Graphics;
importjava.awt.Graphics2D;
importjava.awt.Label;
importjava.awt.Panel;
importjava.awt.event.MouseAdapter;
importjava.awt.event.MouseEvent;
importjava.awt.event.MouseMotionListener;
importjava.awt.event.WindowAdapter;
importjava.awt.event.WindowEvent;


{
	=1L;
	MouseEvente=null;
	intstartX=-1;
	intstartY=-1;
	intendX=-1;
	intendY=-1;
	booleanleft=false;

	publicMouseDrawPanel(Stringtitle)
	{
		(title);
		setLayout(newBorderLayout());
		setResizable(false);
		setSize(500,400);
		setLocationRelativeTo(null);
		addWindowListener(newWindowAdapter()
		{
			@Override
			publicvoidwindowClosing(WindowEvente)
			{
				System.exit(0);
			}
		});
	}

	@Override
	publicvoidpaintComponents(Graphicsg)
	{
		floatlineWidth=8.0f;
		((Graphics2D)g).setStroke(newBasicStroke(lineWidth));
		g.setColor(Color.YELLOW);
		g.drawLine(startX,startY,endX,endY);
		g.dispose();
	}

	publicstaticvoidmain(String[]args)
	{
		finalMouseDrawPanelmdp=newMouseDrawPanel("UseMouseDraw");
		Panelpanel=newPanel();
		panel.setLayout(newFlowLayout(FlowLayout.LEFT));
		LabelstartL=newLabel("start:");
		LabelendL=newLabel("end:");
		finalLabelnowL=newLabel("now:");
		finalLabelstartR=newLabel("000,000");
		finalLabelendR=newLabel("000,000");
		finalLabelnowN=newLabel("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(newMouseMotionListener()
		{
			@Override
			publicvoidmouseMoved(MouseEvente)
			{
				if(mdp.left)
				{
					nowN.setText(e.getX()+","+e.getY());
				}
			}

			@Override
			publicvoidmouseDragged(MouseEvente)
			{
				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(newMouseAdapter()
		{
			@Override
			publicvoidmousePressed(MouseEvente)
			{
				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
			publicvoidmouseReleased(MouseEvente)
			{
				if(mdp.left)
				{
					endR.setText(e.getX()+","+e.getY());
				}
			}
		});
		mdp.setVisible(true);
	}
}

㈣ java画板程序

package draw;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.io.*;
import java.util.*;
import javax.swing.*;

//the point
//impress the info of one point,the x and y

class OnePoint implements Serializable
{
int x;
int y;
int tool;
Color c;
int border;
public OnePoint(int x,int y,int tool,Color cc,int border)
{
this.x=x;
this.y=y;
this.tool=tool;
this.c=cc;
this.border=border;
}
public static void main(String[] args)
{
DrawingBoard oneBorder=new DrawingBoard();
}
}

class DrawingBoard extends Frame implements MouseListener,ItemListener,ActionListener,MouseMotionListener
{
Button pen,line,ellipse,rect,clear,colorboard,storebutton,openbutton;
Choice sizechoice,colorchoice ;
Label pensize, pencolor;
Panel panel ;
FileDialog storefile, openfile;
FileInputStream filein;
FileOutputStream fileout;
ObjectInputStream objectin;
ObjectOutputStream objectout;

int mode=0;
int flagtool=0;
Color flagcolor;
int border;
BasicStroke size;
private Point2D[] p=new Point2D[3];;

OnePoint p1,p2;
Vector<OnePoint> points=new Vector<OnePoint>();
public DrawingBoard()
{
pen=new Button("画笔");
line=new Button("直线");
ellipse=new Button("圆");
rect=new Button("矩形");
clear=new Button("清除");
colorboard=new Button("调色板");
storebutton=new Button("存储文件");
openbutton=new Button("打开文件");

pensize=new Label("画笔大小");
pencolor=new Label("画笔颜色");

storefile=new FileDialog(this,"存储文件",FileDialog.SAVE);
storefile.setVisible(false);
storefile.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
storefile.setVisible(false);
}
});
openfile=new FileDialog(this,"打开文件",FileDialog.LOAD);
openfile.setVisible(false);
openfile.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
openfile.setVisible(false);
}
});

sizechoice=new Choice();
sizechoice.add("1");
sizechoice.add("2");
sizechoice.add("4");
sizechoice.add("6");
sizechoice.add("8");
sizechoice.addItemListener(this);

colorchoice=new Choice();
colorchoice.add("black");
colorchoice.add("red");
colorchoice.add("blue");
colorchoice.add("green");
colorchoice.addItemListener(this);

pen.addActionListener(this);
line.addActionListener(this);
ellipse.addActionListener(this);
rect.addActionListener(this);
clear.addActionListener(this);
colorboard.addActionListener(this);
storebutton.addActionListener(this);
openbutton.addActionListener(this);

panel=new Panel();

panel.add(storebutton);
panel.add(openbutton);

panel.add(pen);
panel.add(line);
panel.add(ellipse);
panel.add(rect);
panel.add(clear);

panel.add(sizechoice);
panel.add(pensize);

panel.add(colorchoice);
panel.add(pencolor);
panel.add(colorboard);

add(panel,BorderLayout.NORTH);
setBounds(100,100,700,600);
setVisible(true);

addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});

/**
* 添加鼠标事件的监听器，否则，鼠标的移动和点击都将无法识别！
* */
addMouseListener(this);
addMouseMotionListener(this);
}
public void paint(Graphics g)
{
Graphics2D g2d=(Graphics2D)g;
if(flagtool==2)
{ //qing chu
g.clearRect(0,0,getSize().width,getSize().height);
}
for(int i=0;i<points.size()-1;i++)
{
p1=(OnePoint)points.elementAt(i);
p2=(OnePoint)points.elementAt(i+1);

g2d.setColor(p1.c); //////////////需要使用Graphics2D从Graphics类中继承下来的方法 setColor（）设置当前的颜色
size=new BasicStroke(p1.border,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);
g2d.setStroke(size);

if(p1.tool==p2.tool)
{
switch(p1.tool)
{
case 0:
Line2D.Double line1=new Line2D.Double(p1.x,p1.y,p2.x,p2.y);
g2d.draw(line1);
break;
case 1:
Line2D.Double line2=new Line2D.Double(p1.x,p1.y,p2.x,p2.y);
g2d.draw(line2);
break;
case 3:
Ellipse2D.Double 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 4:
Rectangle2D.Double rect=new Rectangle2D.Double(p1.x,p1.y,Math.abs(p2.x-p1.x),Math.abs(p2.y-p1.y));
g2d.draw(rect);
break;
default:
}
}
}
}
public void mouseClicked(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mousePressed(MouseEvent e) //鼠标点下时候，将当前的点信息记录
{
mode=0;
p[0]=e.getPoint();
OnePoint pp1=new OnePoint(e.getX(),e.getY(),flagtool,flagcolor,border);
points.addElement(pp1);
//repaint();
}
public void mouseReleased(MouseEvent e) //鼠标松开时候，如果是画笔，则当前截断，是其余状态记下一枚点信息
{
mode=1;
if(flagtool==0)
{
points.addElement(new OnePoint(-1,-1,22,flagcolor,border));
}
else
{
OnePoint pp2=new OnePoint(e.getX(),e.getY(),flagtool,flagcolor,border);
points.addElement(pp2);
points.add(new OnePoint(-1,-1,22,flagcolor,border));
}
repaint();
}

public void itemStateChanged(ItemEvent e)
{
if(e.getSource()==colorchoice)
{
String selected=colorchoice.getSelectedItem();
if(selected=="black"){flagcolor=new Color(0,0,0); }
else if(selected=="red"){flagcolor=new Color(255,0,0); }
else if(selected=="blue"){ flagcolor=new Color(0,0,255);}
else if(selected=="green"){ flagcolor=new Color(0,255,0); }
}
else if(e.getSource()==sizechoice)
{
String selected=sizechoice.getSelectedItem();
if (selected=="1"){ border=1; }
else if(selected=="2"){ border=2*2; }
else if(selected=="4"){ border=4*2; }
else if(selected=="6"){ border=6*2; }
else if(selected=="8"){ border=8*2; }
}
}
/*public void update(Graphics g) { //@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
paint(g);
} */
public void actionPerformed(ActionEvent e)
{
// TODO Auto-generated method stub
if(e.getSource()==pen){flagtool=0; }
else if(e.getSource()==line){ flagtool=1; }
else if(e.getSource()==clear)
{
flagtool=2;
points.removeAllElements();
repaint(); //此语要有，否则今生无法删除！
}
else if(e.getSource()==ellipse){ flagtool=3; }
else if(e.getSource()==rect){ flagtool=4; }
else if(e.getSource()==colorboard)
{
/*
* 使用 javax.swing.×包中的 JColorChooser 类的静态方法showDialog（Component component，String title，Color color ），
* 该方法的参数，component是当前显示对话框的父框架，color是设置调色板初始的被选颜色
*
* 该方法返回被选的颜色，类型为Color
* */
Color color=JColorChooser.showDialog(this, "调色板",flagcolor);
flagcolor=color;
}
else if(e.getSource()==openbutton)
{
openfile.setVisible(true);
if(openfile.getFile()!=null)
{
int temp=flagtool;
flagtool=2;
repaint();
try{
points.removeAllElements();
File file=new File(openfile.getDirectory(),openfile.getFile());
filein=new FileInputStream(file);
objectin=new ObjectInputStream(filein);
points=(Vector)objectin.readObject();
objectin.close();
filein.close();
flagtool=temp;
repaint();
}
catch(Exception ee){ System.out.println(ee.toString()); }
}
}
else if(e.getSource()==storebutton)
{
storefile.setVisible(true);
if(storefile.getFile()!=null)
{
try {
File file=new File(storefile.getDirectory(),storefile.getFile());
fileout=new FileOutputStream(file);
objectout=new ObjectOutputStream(fileout);
objectout.writeObject(points);
objectout.close();
fileout.close();
repaint();
}
catch (FileNotFoundException e1)
{
System.out.println(e1.toString());
e1.printStackTrace();
} catch (IOException ee) {
System.out.println(ee.toString());
ee.printStackTrace();
}
}
}
}

public void mouseDragged(MouseEvent e) //鼠标拖动时候，//当且仅当 flagtool＝＝0，或者表示为橡皮的时候
//才将拖动过程中涉及到的点全部记录下来，并且调用repain()方法，重画当前
// TODO Auto-generated method stub
{
if(flagtool==0)
{
OnePoint pp3=new OnePoint(e.getX(),e.getY(),flagtool,flagcolor,border);
points.addElement(pp3);
repaint();
}
if(flagtool==1)
{
OnePoint pp3=new OnePoint(e.getX(),e.getY(),flagtool,flagcolor,border);
repaint();
}
}

public void mouseMoved(MouseEvent e) {
// TODO Auto-generated method stub
}

}

转载的···
你的分给的太少~~

㈤ Java做画板

网络，想飞社区，在资源里找，在JAVA开发-JAVA实例里，有这个。包括说明文档，源码，可执行JAR包。你可以参考一下，看一下

㈥ JAVA实现简单的画图板

楼主写一个html，很容易把下面代码嵌入到applet，可以一下实现，
还有自己不知道算不算复制。。。-_-!
--------------------------------------------------------------------
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
____________________________________________________________________

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=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();

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"); }
}

㈦ GUI画图板（绘图板）设计，用Java编写程序代码！！谢谢！！

只有矩形有圆形能移动，其它实现起来麻烦点，办法有的只是代码太多。
画圆弧改成了画曲线，圆弧稍麻烦，当然方法是很简单的，你可以自己思考一下。
双击13个颜色中的任意一个都会弹出颜色选择器。
有保存与打开功能。扩展名请用 .jdr
基本满足条件，细节可能不是很好，另，代码比较乱，怕不好看懂咯，呼呼。

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.ArrayList;
import javax.swing.*;
import javax.swing.filechooser.FileNameExtensionFilter;

public class JDraw {
public static void main(String[] args) {
JFrame f=new JFrame();
f.setDefaultCloseOperation(3);
f.setSize(880,600);
f.setLocationRelativeTo(null);
f.getContentPane().add(M.c);
f.getContentPane().add(M.m,"South");
f.setVisible(true);
}
}

class CVS extends Component implements ComponentListener,MouseListener,MouseMotionListener{
public void componentHidden(ComponentEvent e) {}
public void componentMoved(ComponentEvent e) {}
public void componentResized(ComponentEvent e) {resized();}
public void componentShown(ComponentEvent e) {}
private void resized() {
int w=this.getWidth();
int h=this.getHeight();
tbuff=new BufferedImage(w,h,3);
makeBuff(w,h);
}
private void makeBuff(int w,int h) {
Graphics g = tbuff.getGraphics();
g.drawImage(buff,0,0,null);
g.dispose();
buff=new BufferedImage(w,h,3);
g=buff.getGraphics();
g.drawImage(tbuff,0,0,null);
g.dispose();
}

BufferedImage buff,tbuff;
CVS(){
this.addComponentListener(this);
this.addMouseListener(this);
this.addMouseMotionListener(this);
buff=new BufferedImage(1,1,3);
}

public void paint(Graphics gr){
Graphics2D g = buff.createGraphics();
g.setBackground(new Color(0xff000000,true));
g.clearRect(0,0,getWidth(),getHeight());
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
M.sa.drawAll(g);
if(M.ts!=null)
M.ts.draw(g);
g.dispose();
gr.drawImage(buff,0,0,this);
gr.dispose();
}
public void mouseClicked(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mousePressed(MouseEvent e) {
M.mp(e.getPoint());
}
public void mouseReleased(MouseEvent e) {
M.mr(e.getPoint());
}
public void mouseDragged(MouseEvent e) {
M.md(e.getPoint());
}
public void mouseMoved(MouseEvent e) {}
}
class Menu extends JComponent implements MouseListener,ActionListener{
JComboBox sbox,method;
CLabel[] cl;
JCheckBox fillC,drawB;
JRadioButton fc,bc;
ButtonGroup bg;
JButton clear,up,down,save,load;
Menu(){
this.setLayout(new FlowLayout());
method=new JComboBox(new Object[]{"draw","move","erase",});
add(method);
sbox=new JComboBox(new Object[]{"Pt","Ln","Rect","Cir","Arc",});
add(sbox);
cl=new CLabel[13];
for(int i=0; i<cl.length; i++){
cl[i]=new CLabel();
cl[i].addMouseListener(this);
add(cl[i]);
}
fc=new JRadioButton("fc",true);
bc=new JRadioButton("bc");
bg=new ButtonGroup();
bg.add(fc);bg.add(bc);
add(fc);add(bc);
fc.setOpaque(true);
bc.setOpaque(true);
fc.setBackground(Color.white);
bc.setBackground(Color.blue);
fillC=new JCheckBox("Fill",true);
drawB=new JCheckBox("Draw",true);
fillC.addActionListener(this);
drawB.addActionListener(this);
add(fillC);add(drawB);
clear=new JButton("clear");
clear.addActionListener(this);
add(clear);
up=new JButton("zUp");
up.addActionListener(this);
add(up);
down=new JButton("zDown");
down.addActionListener(this);
add(down);
save=new JButton("Save");
save.addActionListener(this);
add(save);
load=new JButton("Load");
load.addActionListener(this);
add(load);
}
public void mouseClicked(MouseEvent e) {
JLabel l=(JLabel)e.getSource();
if(e.getClickCount()==2){
Color sc=JColorChooser.showDialog(null, "Color chooser", l.getBackground());
l.setBackground(sc);
mousePressed(e);
}
}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mousePressed(MouseEvent e) {
Color c=((JLabel)e.getSource()).getBackground();
if(fc.isSelected())
fc.setBackground(c);
else if(bc.isSelected())
bc.setBackground(c);
M.cp();
}
public void mouseReleased(MouseEvent e) {}
public void actionPerformed(ActionEvent e) {
if(e.getSource()==clear)M.clear();
else if(e.getSource()==up)M.up();
else if(e.getSource()==down)M.down();
else if(e.getSource()==save)M.save();
else if(e.getSource()==load)M.load();
else if(e.getSource()==fillC||e.getSource()==drawB)M.cp();
}
}
class CLabel extends JLabel{
static Color[] cs={Color.red,Color.orange,Color.yellow,Color.green,Color.cyan,
Color.blue,Color.magenta,Color.magenta.brighter(),
Color.white,Color.black,Color.gray,Color.LIGHT_GRAY,Color.DARK_GRAY,};
static int i;
CLabel(){
this.setOpaque(true);
this.setBackground(cs[i++]);
this.setBorder(BorderFactory.createLineBorder(Color.black));
this.setPreferredSize(new Dimension(10,20));
}
}
class M{
static JFileChooser jfc=new JFileChooser();
static Menu m=new Menu();
static CVS c=new CVS();
static SA sa=new SA();
static S ts=null,selected=null;
static Color fc,bc;
static void clear(){
sa.ss.clear();
c.repaint();
}
public static void cp() {
System.out.println(selected);
if(selected!=null){
selected.fillColor=m.fc.getBackground();
selected.borderColor=m.bc.getBackground();
selected.fc=m.fillC.isSelected();
selected.db=m.drawB.isSelected();
c.repaint();
}
}
public static void up() {
if(selected!=null){
sa.upZ(selected);
c.repaint();
}
}
public static void down(){
if(selected!=null){
sa.downZ(selected);
c.repaint();
}
}
static{
jfc.setFileFilter(new FileNameExtensionFilter("JDraw file (*.jdraw,*.jdr)","jdr","jdraw"));
}
static void save(){
int x=jfc.showSaveDialog(c);
if(x==JFileChooser.APPROVE_OPTION){
File f = jfc.getSelectedFile();
try{
ObjectOutputStream oos=new ObjectOutputStream(new FileOutputStream(f));
oos.writeObject(sa);
oos.flush();
oos.close();
}catch(Exception e){}
}
}
static void load(){
int x=jfc.showOpenDialog(c);
if(x==JFileChooser.APPROVE_OPTION){
File f = jfc.getSelectedFile();
try{
ObjectInputStream oos=new ObjectInputStream(new FileInputStream(f));
Object r=oos.readObject();
if(r!=null){
sa=(SA)r;
c.repaint();
}
oos.close();
}catch(Exception e){e.printStackTrace();}
}
}
static int mx,my,tx,ty,ox,oy;
static int pc=0,pmax;
static int sm;
static boolean ne=true;
static int mid;
static void mp(Point p){
mid=m.method.getSelectedIndex();
if(mid==0){
if(ne){
mx=p.x;my=p.y;
pc=0;
sm=m.sbox.getSelectedIndex();
pmax=sm==4?2:1;
ne=false;
}
++pc;
}
else if(mid==1){
checkSel(p);
mx=p.x;my=p.y;
}
else if(mid==2){
checkSel(p);
if(selected!=null){
sa.ss.remove(selected);
c.repaint();
}
}
}
private static void checkSel(Point p) {
selected=null;
for(int i=sa.ss.size();i>0; i--)
if(sa.ss.get(i-1).shape.contains(p)){
selected=sa.ss.get(i-1);break;
}
sa.select(selected);
c.repaint();
}
static void mt(){
Shape s=null;
int cx,cy,cw,ch;
switch(sm){
case 0:
case 2:
cx=Math.min(mx,tx);
cy=Math.min(my,ty);
cw=Math.abs(mx-tx);
ch=Math.abs(my-ty);
if(sm==0)
s=new Ellipse2D.Double(cx,cy,cw,ch);
else
s=new Rectangle(cx,cy,cw,ch);
break;
case 1:
s=new Line2D.Float(mx,my,tx,ty);
break;
case 3:
cw=Math.abs(mx-tx);
ch=Math.abs(my-ty);
int cd=(int)Math.sqrt(Math.pow(mx-tx,2)+Math.pow(my-ty,2))*2;
cx=mx-cd/2;
cy=my-cd/2;
s=new Ellipse2D.Double(cx,cy,cd,cd);
break;
case 4:
Path2D p=new Path2D.Double();
p.moveTo(mx,my);
if(pc==1){
p.lineTo(tx, ty);
}
else{
p.quadTo(ox,oy,tx,ty);
}
s=p;
break;
}
ts=new S(s,m.fc.getBackground(),m.bc.getBackground(),m.fillC.isSelected(),m.drawB.isSelected(),null);
c.repaint();
}
static void md(Point p){
if(mid==0){
if(!sa.ss.isEmpty()){
sa.ss.get(sa.ss.size()-1).sel=false;
}
if(pc>1){
ox=p.x;oy=p.y;
}
else{
tx=p.x;ty=p.y;
}
mt();
}
else if(mid==1){
if(selected!=null){
moveTo(selected,p);
c.repaint();
}
}
else if(mid==2){
checkSel(p);
if(selected!=null){
sa.ss.remove(selected);
c.repaint();
}
}
}
static void moveTo(S s, Point p) {
if(s.shape instanceof Rectangle){
Rectangle r=(Rectangle)s.shape;
r.setLocation(r.x+p.x-mx,r.y+p.y-my);
mx=p.x;my=p.y;
}
else if(s.shape instanceof Ellipse2D){
Ellipse2D e=(Ellipse2D)s.shape;
e.setFrame(e.getX()+p.x-mx,e.getY()+p.y-my,e.getWidth(),e.getHeight());
mx=p.x;my=p.y;
}
}
static void mr(Point p) {
if(pc==pmax){
pc=0;
ne=true;
sa.add(ts);
selected=ts;
ts=null;
}
}
}

class S implements Serializable{
boolean fc,db,sel=true;
Shape shape;
Color fillColor,borderColor;
Stroke stroke;
static Stroke bstroke=new MyBasicStroke();
static Stroke selectStroke=new BasicStroke(1,BasicStroke.CAP_BUTT,BasicStroke.JOIN_MITER,1,new float[]{5,2},1);
S(Shape s,Color c,Color b,boolean f,boolean d,Stroke k){
this.shape=s;this.fillColor=c;this.borderColor=b;this.fc=f;this.db=d;this.stroke=k==null?bstroke:k;
}
void draw(Graphics2D g){
if(fc){
g.setColor(fillColor);
g.fill(shape);
}
if(db){
g.setColor(borderColor);
g.setStroke(stroke);
g.draw(shape);
}
if(sel){
g.setColor(Color.green);
g.setStroke(selectStroke);
g.draw(shape.getBounds());
}
}
}
class MyBasicStroke extends BasicStroke implements Serializable{}
class SA implements Serializable{
ArrayList<S> ss=new ArrayList<S>();
void add(S s){
if(s!=null){
for(S sx:ss)
sx.sel=false;
ss.add(s);
}
}
S remove(int i){
return ss.remove(i);
}
void remove(S s){
ss.remove(s);
}
void upZ(S s){
indexZ(s,1);
}
void downZ(S s){
indexZ(s,-1);
}
void indexZ(S s, int i) {
int si=ss.indexOf(s);
if(si+i<0||si+i>ss.size()-1)return;
swap(s,ss.get(si+i));
}
void swap(S a,S b){
int ai=ss.indexOf(a);
int bi=ss.indexOf(b);
ss.set(ai,b);
ss.set(bi,a);
}
void select(S s){
for(S x:ss)
x.sel=false;
if(s!=null)
s.sel=true;
}
void drawAll(Graphics2D g){
for(S s:ss)
s.draw(g);
}
}

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画板java

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