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个颜肆碧色中的任意一个都会d出颜色选择器。
有保存与打开裂缺举功能。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=0i<cl.lengthi++){
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.xmy=p.y
pc=0
sm=m.sbox.getSelectedIndex()
pmax=sm==4?2:1
ne=false
}
++pc
}
else if(mid==1){
checkSel(p)
mx=p.xmy=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>0i--)
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.xoy=p.y
}
else{
tx=p.xty=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.xmy=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.xmy=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=sthis.fillColor=cthis.borderColor=bthis.fc=fthis.db=dthis.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)
}
}
看看下面的代码胡梁，新建类T，把代码拷进去便可运行。有运行截图：
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 Econ = 5//橡皮裤册运大小
int toolFlag = 0//toolFlag:工具标记
//toolFlag工具对应表：
//（0--画笔）；（1--橡皮）；（2--清除）；
//（3--直线姿早）；（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
@SuppressWarnings("unchecked")
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
@SuppressWarnings("unchecked")
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")
colchooser = new Button("显示调色板")
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)
//各组件事件监听
clear.addActionListener(this)
eraser.addActionListener(this)
pen.addActionListener(this)
drLine.addActionListener(this)
drCircle.addActionListener(this)
drRect.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)
颜色.setBackground(Color.gray)
大小B.setBackground(Color.gray)
大小E.setBackground(Color.gray)
//面板添加组件
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=1i<n 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://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}
}
}
@SuppressWarnings({"serial","unused", "unchecked"})
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)
}
@SuppressWarnings("unchecked")
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 :
}
}
@SuppressWarnings("unchecked")
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){}
@SuppressWarnings("unchecked")
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
}
}
}
//end paintboard
public class T{
public static void main(String args[]){
new paintboard("画图程序")}
}
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