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d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 javaawt;
import javaawtevent;
import javaawtgeom;
import javaawtimageBufferedImage;
import javaio;
import javautilArrayList;
import javaxswing;
import javaxswingfilechooserFileNameExtensionFilter;
public class JDraw {
public static void main(String[] args) {
JFrame f=new JFrame();
fsetDefaultCloseOperation(3);
fsetSize(880,600);
fsetLocationRelativeTo(null);
fgetContentPane()add(Mc);
fgetContentPane()add(Mm,"South");
fsetVisible(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=thisgetWidth();
int h=thisgetHeight();
tbuff=new BufferedImage(w,h,3);
makeBuff(w,h);
}
private void makeBuff(int w,int h) {
Graphics g = tbuffgetGraphics();
gdrawImage(buff,0,0,null);
gdispose();
buff=new BufferedImage(w,h,3);
g=buffgetGraphics();
gdrawImage(tbuff,0,0,null);
gdispose();
}
BufferedImage buff,tbuff;
CVS(){
thisaddComponentListener(this);
thisaddMouseListener(this);
thisaddMouseMotionListener(this);
buff=new BufferedImage(1,1,3);
}
public void paint(Graphics gr){
Graphics2D g = buffcreateGraphics();
gsetBackground(new Color(0xff000000,true));
gclearRect(0,0,getWidth(),getHeight());
gsetRenderingHint(RenderingHintsKEY_ANTIALIASING,
RenderingHintsVALUE_ANTIALIAS_ON);
MsadrawAll(g);
if(Mts!=null)
Mtsdraw(g);
gdispose();
grdrawImage(buff,0,0,this);
grdispose();
}
public void mouseClicked(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mousePressed(MouseEvent e) {
Mmp(egetPoint());
}
public void mouseReleased(MouseEvent e) {
Mmr(egetPoint());
}
public void mouseDragged(MouseEvent e) {
Mmd(egetPoint());
}
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(){
thissetLayout(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<cllength; i++){
cl[i]=new CLabel();
cl[i]addMouseListener(this);
add(cl[i]);
}
fc=new JRadioButton("fc",true);
bc=new JRadioButton("bc");
bg=new ButtonGroup();
bgadd(fc);bgadd(bc);
add(fc);add(bc);
fcsetOpaque(true);
bcsetOpaque(true);
fcsetBackground(Colorwhite);
bcsetBackground(Colorblue);
fillC=new JCheckBox("Fill",true);
drawB=new JCheckBox("Draw",true);
fillCaddActionListener(this);
drawBaddActionListener(this);
add(fillC);add(drawB);
clear=new JButton("clear");
clearaddActionListener(this);
add(clear);
up=new JButton("zUp");
upaddActionListener(this);
add(up);
down=new JButton("zDown");
downaddActionListener(this);
add(down);
save=new JButton("Save");
saveaddActionListener(this);
add(save);
load=new JButton("Load");
loadaddActionListener(this);
add(load);
}
public void mouseClicked(MouseEvent e) {
JLabel l=(JLabel)egetSource();
if(egetClickCount()==2){
Color sc=JColorChoosershowDialog(null, "Color chooser", lgetBackground());
lsetBackground(sc);
mousePressed(e);
}
}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mousePressed(MouseEvent e) {
Color c=((JLabel)egetSource())getBackground();
if(fcisSelected())
fcsetBackground(c);
else if(bcisSelected())
bcsetBackground(c);
Mcp();
}
public void mouseReleased(MouseEvent e) {}
public void actionPerformed(ActionEvent e) {
if(egetSource()==clear)Mclear();
else if(egetSource()==up)Mup();
else if(egetSource()==down)Mdown();
else if(egetSource()==save)Msave();
else if(egetSource()==load)Mload();
else if(egetSource()==fillC||egetSource()==drawB)Mcp();
}
}
class CLabel extends JLabel{
static Color[] cs={Colorred,Colororange,Coloryellow,Colorgreen,Colorcyan,
Colorblue,Colormagenta,Colormagentabrighter(),
Colorwhite,Colorblack,Colorgray,ColorLIGHT_GRAY,ColorDARK_GRAY,};
static int i;
CLabel(){
thissetOpaque(true);
thissetBackground(cs[i++]);
thissetBorder(BorderFactorycreateLineBorder(Colorblack));
thissetPreferredSize(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(){
sassclear();
crepaint();
}
public static void cp() {
Systemoutprintln(selected);
if(selected!=null){
selectedfillColor=mfcgetBackground();
selectedborderColor=mbcgetBackground();
selectedfc=mfillCisSelected();
selecteddb=mdrawBisSelected();
crepaint();
}
}
public static void up() {
if(selected!=null){
saupZ(selected);
crepaint();
}
}
public static void down(){
if(selected!=null){
sadownZ(selected);
crepaint();
}
}
static{
jfcsetFileFilter(new FileNameExtensionFilter("JDraw file (jdraw,jdr)","jdr","jdraw"));
}
static void save(){
int x=jfcshowSaveDialog(c);
if(x==JFileChooserAPPROVE_OPTION){
File f = jfcgetSelectedFile();
try{
ObjectOutputStream oos=new ObjectOutputStream(new FileOutputStream(f));
ooswriteObject(sa);
oosflush();
oosclose();
}catch(Exception e){}
}
}
static void load(){
int x=jfcshowOpenDialog(c);
if(x==JFileChooserAPPROVE_OPTION){
File f = jfcgetSelectedFile();
try{
ObjectInputStream oos=new ObjectInputStream(new FileInputStream(f));
Object r=oosreadObject();
if(r!=null){
sa=(SA)r;
crepaint();
}
oosclose();
}catch(Exception e){eprintStackTrace();}
}
}
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=mmethodgetSelectedIndex();
if(mid==0){
if(ne){
mx=px;my=py;
pc=0;
sm=msboxgetSelectedIndex();
pmax=sm==42:1;
ne=false;
}
++pc;
}
else if(mid==1){
checkSel(p);
mx=px;my=py;
}
else if(mid==2){
checkSel(p);
if(selected!=null){
sassremove(selected);
crepaint();
}
}
}
private static void checkSel(Point p) {
selected=null;
for(int i=sasssize();i>0; i--)
if(sassget(i-1)shapecontains(p)){
selected=sassget(i-1);break;
}
saselect(selected);
crepaint();
}
static void mt(){
Shape s=null;
int cx,cy,cw,ch;
switch(sm){
case 0:
case 2:
cx=Mathmin(mx,tx);
cy=Mathmin(my,ty);
cw=Mathabs(mx-tx);
ch=Mathabs(my-ty);
if(sm==0)
s=new Ellipse2DDouble(cx,cy,cw,ch);
else
s=new Rectangle(cx,cy,cw,ch);
break;
case 1:
s=new Line2DFloat(mx,my,tx,ty);
break;
case 3:
cw=Mathabs(mx-tx);
ch=Mathabs(my-ty);
int cd=(int)Mathsqrt(Mathpow(mx-tx,2)+Mathpow(my-ty,2))2;
cx=mx-cd/2;
cy=my-cd/2;
s=new Ellipse2DDouble(cx,cy,cd,cd);
break;
case 4:
Path2D p=new Path2DDouble();
pmoveTo(mx,my);
if(pc==1){
plineTo(tx, ty);
}
else{
pquadTo(ox,oy,tx,ty);
}
s=p;
break;
}
ts=new S(s,mfcgetBackground(),mbcgetBackground(),mfillCisSelected(),mdrawBisSelected(),null);
crepaint();
}
static void md(Point p){
if(mid==0){
if(!sassisEmpty()){
sassget(sasssize()-1)sel=false;
}
if(pc>1){
ox=px;oy=py;
}
else{
tx=px;ty=py;
}
mt();
}
else if(mid==1){
if(selected!=null){
moveTo(selected,p);
crepaint();
}
}
else if(mid==2){
checkSel(p);
if(selected!=null){
sassremove(selected);
crepaint();
}
}
}
static void moveTo(S s, Point p) {
if(sshape instanceof Rectangle){
Rectangle r=(Rectangle)sshape;
rsetLocation(rx+px-mx,ry+py-my);
mx=px;my=py;
}
else if(sshape instanceof Ellipse2D){
Ellipse2D e=(Ellipse2D)sshape;
esetFrame(egetX()+px-mx,egetY()+py-my,egetWidth(),egetHeight());
mx=px;my=py;
}
}
static void mr(Point p) {
if(pc==pmax){
pc=0;
ne=true;
saadd(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,BasicStrokeCAP_BUTT,BasicStrokeJOIN_MITER,1,new float[]{5,2},1);
S(Shape s,Color c,Color b,boolean f,boolean d,Stroke k){
thisshape=s;thisfillColor=c;thisborderColor=b;thisfc=f;thisdb=d;thisstroke=k==nullbstroke:k;
}
void draw(Graphics2D g){
if(fc){
gsetColor(fillColor);
gfill(shape);
}
if(db){
gsetColor(borderColor);
gsetStroke(stroke);
gdraw(shape);
}
if(sel){
gsetColor(Colorgreen);
gsetStroke(selectStroke);
gdraw(shapegetBounds());
}
}
}
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)
sxsel=false;
ssadd(s);
}
}
S remove(int i){
return ssremove(i);
}
void remove(S s){
ssremove(s);
}
void upZ(S s){
indexZ(s,1);
}
void downZ(S s){
indexZ(s,-1);
}
void indexZ(S s, int i) {
int si=ssindexOf(s);
if(si+i<0||si+i>sssize()-1)return;
swap(s,ssget(si+i));
}
void swap(S a,S b){
int ai=ssindexOf(a);
int bi=ssindexOf(b);
ssset(ai,b);
ssset(bi,a);
}
void select(S s){
for(S x:ss)
xsel=false;
if(s!=null)
ssel=true;
}
void drawAll(Graphics2D g){
for(S s:ss)
sdraw(g);
}
}
楼主给你一个我的，直接保存成pbjava编译运行，就是你要的画图功能 ，可以参考一下
____________________________________________________________________
import javaapplet;
import javaawt;
import javaawtevent;
import javautil;
import javaxswing;
import javaawtgeom;
import javaio;
class Point implements Serializable
{
int x,y;
Color col;
int tool;
int boarder;
Point(int x, int y, Color col, int tool, int boarder)
{
thisx = x;
thisy = y;
thiscol = col;
thistool = tool;
thisboarder = boarder;
}
}
class paintboard extends Frame implements ActionListener,MouseMotionListener,MouseListener,ItemListener
{
int x = -1, y = -1;
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,BasicStrokeCAP_BUTT,BasicStrokeJOIN_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();
ColChoiceadd("black");
ColChoiceadd("red");
ColChoiceadd("blue");
ColChoiceadd("green");
ColChoiceaddItemListener(this);
//画笔大小选择
SizeChoice = new Choice();
SizeChoiceadd("1");
SizeChoiceadd("3");
SizeChoiceadd("5");
SizeChoiceadd("7");
SizeChoiceadd("9");
SizeChoiceaddItemListener(this);
//橡皮大小选择
EraserChoice = new Choice();
EraserChoiceadd("5");
EraserChoiceadd("9");
EraserChoiceadd("13");
EraserChoiceadd("17");
EraserChoiceaddItemListener(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
clearaddActionListener(this);
eraseraddActionListener(this);
penaddActionListener(this);
drLineaddActionListener(this);
drCircleaddActionListener(this);
drRectaddActionListener(this);
openPicaddActionListener(this);
savePicaddActionListener(this);
colchooseraddActionListener(this);
颜色 = new Label("画笔颜色",LabelCENTER);
大小B = new Label("画笔大小",LabelCENTER);
大小E = new Label("橡皮大小",LabelCENTER);
//面板添加组件
toolPaneladd(openPic);
toolPaneladd(savePic);
toolPaneladd(pen);
toolPaneladd(drLine);
toolPaneladd(drCircle);
toolPaneladd(drRect);
toolPaneladd(颜色); toolPaneladd(ColChoice);
toolPaneladd(大小B); toolPaneladd(SizeChoice);
toolPaneladd(colchooser);
toolPaneladd(eraser);
toolPaneladd(大小E); toolPaneladd(EraserChoice);
toolPaneladd(clear);
//工具面板到APPLET面板
add(toolPanel,BorderLayoutNORTH);
setBounds(60,60,900,600); setVisible(true);
validate();
//dialog for save and load
openPicture = new FileDialog(this,"打开图画",FileDialogLOAD);
openPicturesetVisible(false);
savePicture = new FileDialog(this,"保存图画",FileDialogSAVE);
savePicturesetVisible(false);
openPictureaddWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{ openPicturesetVisible(false); }
});
savePictureaddWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{ savePicturesetVisible(false); }
});
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{ Systemexit(0);}
});
}
public void paint(Graphics g)
{
Graphics2D g2d = (Graphics2D)g;
Point p1,p2;
n = paintInfosize();
if(toolFlag==2)
gclearRect(0,0,getSize()width,getSize()height);//清除
for(int i=0; i<n ;i++){
p1 = (Point)paintInfoelementAt(i);
p2 = (Point)paintInfoelementAt(i+1);
size = new BasicStroke(p1boarder,BasicStrokeCAP_BUTT,BasicStrokeJOIN_BEVEL);
g2dsetColor(p1col);
g2dsetStroke(size);
if(p1tool==p2tool)
{
switch(p1tool)
{
case 0://画笔
Line2D line1 = new Line2DDouble(p1x, p1y, p2x, p2y);
g2ddraw(line1);
break;
case 1://橡皮
gclearRect(p1x, p1y, p1boarder, p1boarder);
break;
case 3://画直线
Line2D line2 = new Line2DDouble(p1x, p1y, p2x, p2y);
g2ddraw(line2);
break;
case 4://画圆
Ellipse2D ellipse = new Ellipse2DDouble(p1x, p1y, Mathabs(p2x-p1x) , Mathabs(p2y-p1y));
g2ddraw(ellipse);
break;
case 5://画矩形
Rectangle2D rect = new Rectangle2DDouble(p1x, p1y, Mathabs(p2x-p1x) , Mathabs(p2y-p1y));
g2ddraw(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(egetSource()==ColChoice)//预选颜色
{
String name = ColChoicegetSelectedItem();
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(egetSource()==SizeChoice)//画笔大小
{
String selected = SizeChoicegetSelectedItem();
if(selected=="1")
{
con = 1;
size = new BasicStroke(con,BasicStrokeCAP_BUTT,BasicStrokeJOIN_BEVEL);
}
else if(selected=="3")
{
con = 3;
size = new BasicStroke(con,BasicStrokeCAP_BUTT,BasicStrokeJOIN_BEVEL);
}
else if(selected=="5")
{con = 5;
size = new BasicStroke(con,BasicStrokeCAP_BUTT,BasicStrokeJOIN_BEVEL);
}
else if(selected=="7")
{con = 7;
size = new BasicStroke(con,BasicStrokeCAP_BUTT,BasicStrokeJOIN_BEVEL);
}
else if(selected=="9")
{con = 9;
size = new BasicStroke(con,BasicStrokeCAP_BUTT,BasicStrokeJOIN_BEVEL);
}
}
else if(egetSource()==EraserChoice)//橡皮大小
{
String Esize = EraserChoicegetSelectedItem();
if(Esize=="5")
{ Econ = 52; }
else if(Esize=="9")
{ Econ = 92; }
else if(Esize=="13")
{ Econ = 132; }
else if(Esize=="17")
{ Econ = 173; }
}
}
public void mouseDragged(MouseEvent e)
{
Point p1 ;
switch(toolFlag){
case 0://画笔
x = (int)egetX();
y = (int)egetY();
p1 = new Point(x, y, c, toolFlag, con);
paintInfoaddElement(p1);
repaint();
break;
case 1://橡皮
x = (int)egetX();
y = (int)egetY();
p1 = new Point(x, y, null, toolFlag, Econ);
paintInfoaddElement(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)egetX();
y = (int)egetY();
p2 = new Point(x, y, c, toolFlag, con);
paintInfoaddElement(p2);
break;
case 4: //圆
x = (int)egetX();
y = (int)egetY();
p2 = new Point(x, y, c, toolFlag, con);
paintInfoaddElement(p2);
break;
case 5: //矩形
x = (int)egetX();
y = (int)egetY();
p2 = new Point(x, y, c, toolFlag, con);
paintInfoaddElement(p2);
break;
default :
}
}
public void mouseReleased(MouseEvent e)
{
Point p3;
switch(toolFlag){
case 0://画笔
paintInfoaddElement(cutflag);
break;
case 1: //eraser
paintInfoaddElement(cutflag);
break;
case 3://直线
x = (int)egetX();
y = (int)egetY();
p3 = new Point(x, y, c, toolFlag, con);
paintInfoaddElement(p3);
paintInfoaddElement(cutflag);
repaint();
break;
case 4: //圆
x = (int)egetX();
y = (int)egetY();
p3 = new Point(x, y, c, toolFlag, con);
paintInfoaddElement(p3);
paintInfoaddElement(cutflag);
repaint();
break;
case 5: //矩形
x = (int)egetX();
y = (int)egetY();
p3 = new Point(x, y, c, toolFlag, con);
paintInfoaddElement(p3);
paintInfoaddElement(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(egetSource()==pen)//画笔
{toolFlag = 0;}
if(egetSource()==eraser)//橡皮
{toolFlag = 1;}
if(egetSource()==clear)//清除
{
toolFlag = 2;
paintInforemoveAllElements();
repaint();
}
if(egetSource()==drLine)//画线
{toolFlag = 3;}
if(egetSource()==drCircle)//画圆
{toolFlag = 4;}
if(egetSource()==drRect)//画矩形
{toolFlag = 5;}
if(egetSource()==colchooser)//调色板
{
Color newColor = JColorChoosershowDialog(this,"调色板",c);
c = newColor;
}
if(egetSource()==openPic)//打开图画
{
openPicturesetVisible(true);
if(openPicturegetFile()!=null)
{
int tempflag;
tempflag = toolFlag;
toolFlag = 2 ;
repaint();
try{
paintInforemoveAllElements();
File filein = new File(openPicturegetDirectory(),openPicturegetFile());
picIn = new FileInputStream(filein);
VIn = new ObjectInputStream(picIn);
paintInfo = (Vector)VInreadObject();
VInclose();
repaint();
toolFlag = tempflag;
}
catch(ClassNotFoundException IOe2)
{
repaint();
toolFlag = tempflag;
Systemoutprintln("can not read object");
}
catch(IOException IOe)
{
repaint();
toolFlag = tempflag;
Systemoutprintln("can not read file");
}
}
}
if(egetSource()==savePic)//保存图画
{
savePicturesetVisible(true);
try{
File fileout = new File(savePicturegetDirectory(),savePicturegetFile());
picOut = new FileOutputStream(fileout);
VOut = new ObjectOutputStream(picOut);
VOutwriteObject(paintInfo);
VOutclose();
}
catch(IOException IOe)
{
Systemoutprintln("can not write object");
}
}
}
}//end paintboard
public class pb
{
public static void main(String args[])
{ new paintboard("画图程序"); }
}
你可以另外写一个方法，鼠标点击时触发那个方法，该方法首先获取鼠标点击的那个点，然后根据那个坐标在它的四周画图就可以了（可以以那个点为圆心画圆并填充，这样一条直线下去，就实现了加粗）。像获取点的坐标，画圆什么的方法，API里都有。
新建一个java文件,取名叫做PaintJavajava
代码如下:
import javaapplet;
import javaawt;
import javaawtevent;
import javautil;
import javaxswing;
import javaawtgeom;
import javaio;
class Point implements Serializable
{
int x,y;
Color col;
int tool;
int boarder;
Point(int x, int y, Color col, int tool, int boarder)
{
thisx = x;
thisy = y;
thiscol = col;
thistool = tool;
thisboarder = 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,BasicStrokeCAP_BUTT,BasicStrokeJOIN_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();
ColChoiceadd("black");
ColChoiceadd("red");
ColChoiceadd("blue");
ColChoiceadd("green");
ColChoiceaddItemListener(this);
//画笔大小选择
SizeChoice = new Choice();
SizeChoiceadd("1");
SizeChoiceadd("3");
SizeChoiceadd("5");
SizeChoiceadd("7");
SizeChoiceadd("9");
SizeChoiceaddItemListener(this);
//橡皮大小选择
EraserChoice = new Choice();
EraserChoiceadd("5");
EraserChoiceadd("9");
EraserChoiceadd("13");
EraserChoiceadd("17");
EraserChoiceaddItemListener(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
clearaddActionListener(this);
eraseraddActionListener(this);
penaddActionListener(this);
drLineaddActionListener(this);
drCircleaddActionListener(this);
drRectaddActionListener(this);
openPicaddActionListener(this);
savePicaddActionListener(this);
colchooseraddActionListener(this);
颜色 = new Label("画笔颜色",LabelCENTER);
大小B = new Label("画笔大小",LabelCENTER);
大小E = new Label("橡皮大小",LabelCENTER);
//面板添加组件
toolPaneladd(openPic);
toolPaneladd(savePic);
toolPaneladd(pen);
toolPaneladd(drLine);
toolPaneladd(drCircle);
toolPaneladd(drRect);
toolPaneladd(颜色); toolPaneladd(ColChoice);
toolPaneladd(大小B); toolPaneladd(SizeChoice);
toolPaneladd(colchooser);
toolPaneladd(eraser);
toolPaneladd(大小E); toolPaneladd(EraserChoice);
toolPaneladd(clear);
//工具面板到APPLET面板
add(toolPanel,BorderLayoutNORTH);
setBounds(60,60,900,600); setVisible(true);
validate();
//dialog for save and load
openPicture = new FileDialog(this,"打开图画",FileDialogLOAD);
openPicturesetVisible(false);
savePicture = new FileDialog(this,"保存图画",FileDialogSAVE);
savePicturesetVisible(false);
openPictureaddWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{ openPicturesetVisible(false); }
});
savePictureaddWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{ savePicturesetVisible(false); }
});
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{ Systemexit(0);}
});
}
public void paint(Graphics g)
{
Graphics2D g2d = (Graphics2D)g;
Point p1,p2;
n = paintInfosize();
if(toolFlag==2)
gclearRect(0,0,getSize()width,getSize()height);//清除
for(int i=0; i<n ;i++){
p1 = (Point)paintInfoelementAt(i);
p2 = (Point)paintInfoelementAt(i+1);
size = new BasicStroke(p1boarder,BasicStrokeCAP_BUTT,BasicStrokeJOIN_BEVEL);
g2dsetColor(p1col);
g2dsetStroke(size);
if(p1tool==p2tool)
{
switch(p1tool)
{
case 0://画笔
Line2D line1 = new Line2DDouble(p1x, p1y, p2x, p2y);
g2ddraw(line1);
break;
case 1://橡皮
gclearRect(p1x, p1y, p1boarder, p1boarder);
break;
case 3://画直线
Line2D line2 = new Line2DDouble(p1x, p1y, p2x, p2y);
g2ddraw(line2);
break;
case 4://画圆
Ellipse2D ellipse = new Ellipse2DDouble(p1x, p1y, Mathabs(p2x-p1x) , Mathabs(p2y-p1y));
g2ddraw(ellipse);
break;
case 5://画矩形
Rectangle2D rect = new Rectangle2DDouble(p1x, p1y, Mathabs(p2x-p1x) , Mathabs(p2y-p1y));
g2ddraw(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(egetSource()==ColChoice)//预选颜色
{
String name = ColChoicegetSelectedItem();
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(egetSource()==SizeChoice)//画笔大小
{
String selected = SizeChoicegetSelectedItem();
if(selected=="1")
{
con = 1;
size = new BasicStroke(con,BasicStrokeCAP_BUTT,BasicStrokeJOIN_BEVEL);
}
else if(selected=="3")
{
con = 3;
size = new BasicStroke(con,BasicStrokeCAP_BUTT,BasicStrokeJOIN_BEVEL);
}
else if(selected=="5")
{con = 5;
size = new BasicStroke(con,BasicStrokeCAP_BUTT,BasicStrokeJOIN_BEVEL);
}
else if(selected=="7")
{con = 7;
size = new BasicStroke(con,BasicStrokeCAP_BUTT,BasicStrokeJOIN_BEVEL);
}
else if(selected=="9")
{con = 9;
size = new BasicStroke(con,BasicStrokeCAP_BUTT,BasicStrokeJOIN_BEVEL);
}
}
else if(egetSource()==EraserChoice)//橡皮大小
{
String Esize = EraserChoicegetSelectedItem();
if(Esize=="5")
{ Econ = 52; }
else if(Esize=="9")
{ Econ = 92; }
else if(Esize=="13")
{ Econ = 132; }
else if(Esize=="17")
{ Econ = 173; }
}
}
public void mouseDragged(MouseEvent e)
{
Point p1 ;
switch(toolFlag){
case 0://画笔
x = (int)egetX();
y = (int)egetY();
p1 = new Point(x, y, c, toolFlag, con);
paintInfoaddElement(p1);
repaint();
break;
case 1://橡皮
x = (int)egetX();
y = (int)egetY();
p1 = new Point(x, y, null, toolFlag, Econ);
paintInfoaddElement(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)egetX();
y = (int)egetY();
p2 = new Point(x, y, c, toolFlag, con);
paintInfoaddElement(p2);
break;
case 4: //圆
x = (int)egetX();
y = (int)egetY();
p2 = new Point(x, y, c, toolFlag, con);
paintInfoaddElement(p2);
break;
case 5: //矩形
x = (int)egetX();
y = (int)egetY();
p2 = new Point(x, y, c, toolFlag, con);
paintInfoaddElement(p2);
break;
default :
}
}
public void mouseReleased(MouseEvent e)
{
Point p3;
switch(toolFlag){
case 0://画笔
paintInfoaddElement(cutflag);
break;
case 1: //eraser
paintInfoaddElement(cutflag);
break;
case 3://直线
x = (int)egetX();
y = (int)egetY();
p3 = new Point(x, y, c, toolFlag, con);
paintInfoaddElement(p3);
paintInfoaddElement(cutflag);
repaint();
break;
case 4: //圆
x = (int)egetX();
y = (int)egetY();
p3 = new Point(x, y, c, toolFlag, con);
paintInfoaddElement(p3);
paintInfoaddElement(cutflag);
repaint();
break;
case 5: //矩形
x = (int)egetX();
y = (int)egetY();
p3 = new Point(x, y, c, toolFlag, con);
paintInfoaddElement(p3);
paintInfoaddElement(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(egetSource()==pen)//画笔
{toolFlag = 0;}
if(egetSource()==eraser)//橡皮
{toolFlag = 1;}
if(egetSource()==clear)//清除
{
toolFlag = 2;
paintInforemoveAllElements();
repaint();
}
if(egetSource()==drLine)//画线
{toolFlag = 3;}
if(egetSource()==drCircle)//画圆
{toolFlag = 4;}
if(egetSource()==drRect)//画矩形
{toolFlag = 5;}
if(egetSource()==colchooser)//调色板
{
Color newColor = JColorChoosershowDialog(this,"调色板",c);
c = newColor;
}
if(egetSource()==openPic)//打开图画
{
openPicturesetVisible(true);
if(openPicturegetFile()!=null)
{
int tempflag;
tempflag = toolFlag;
toolFlag = 2 ;
repaint();
try{
paintInforemoveAllElements();
File filein = new File(openPicturegetDirectory(),openPicturegetFile());
picIn = new FileInputStream(filein);
VIn = new ObjectInputStream(picIn);
paintInfo = (Vector)VInreadObject();
VInclose();
repaint();
toolFlag = tempflag;
}
catch(ClassNotFoundException IOe2)
{
repaint();
toolFlag = tempflag;
Systemoutprintln("can not read object");
}
catch(IOException IOe)
{
repaint();
toolFlag = tempflag;
Systemoutprintln("can not read file");
}
}
}
if(egetSource()==savePic)//保存图画
{
savePicturesetVisible(true);
try{
File fileout = new File(savePicturegetDirectory(),savePicturegetFile());
picOut = new FileOutputStream(fileout);
VOut = new ObjectOutputStream(picOut);
VOutwriteObject(paintInfo);
VOutclose();
}
catch(IOException IOe)
{
Systemoutprintln("can not write object");
}
}
}
}//end paintboard
public class PaintJava
{
public static void main(String args[])
{ new paintboard("画图程序"); }
}
累啊给分吧!!
首先，如果你只是要实现电子时钟，根本就不需要用到多线程。
如果你真的是要使用，就新建一个类，实现Runnable接口就是了。
如：
class MyThread1 implements Runnable{
public MyThread(){
}
public void run(){
}
}
使用的时候，就：
Thread myThread=new Thread(new MyThread());
myThreadstart();
如果要画图，你就直接把组件通过构造方法传到MyThread中就是了
以上就是关于GUI画图板（绘图板）设计，用Java编写程序代码！！谢谢！！全部的内容，包括:GUI画图板（绘图板）设计，用Java编写程序代码！！谢谢！！、用JAVA实现的图形编辑器、java画图板画笔粗细的问题，急~~~~~高手速来帮忙改改！等相关内容解答，如果想了解更多相关内容，可以关注我们，你们的支持是我们更新的动力！
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