nvenccapcontext是什么程序_CMS教程

package guitestmyboard;

import javaawt;

import javaawtevent;

import javaawtgeom;

import javaio;

import javautil;

import javaxswing;

//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){

thisx=x;

thisy=y;

thistool=tool;

thisc=cc;

thisborder=border;

}

class DrawingBoard extends Frame implements MouseListener,ItemListener,ActionListener,MouseMotionListener{

Button pen;

Button line ;

Button ellipse ;

Button rect ;

Button clear ;

Button colorboard ;

Button storebutton;

Button openbutton;

Choice sizechoice ;

Choice colorchoice ;

Label pensize;

Label pencolor;

Panel panel ;

FileDialog storefile;

FileDialog openfile;

FileInputStream filein;

FileOutputStream fileout;

ObjectInputStream objectin;

ObjectOutputStream objectout;

int flagtool=0;

Color flagcolor;

int border;

BasicStroke size;

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",FileDialogSAVE);

storefilesetVisible(false);

storefileaddWindowListener(new WindowAdapter(){

public void windowClosing(WindowEvent e){

storefilesetVisible(false);

}

});

openfile=new FileDialog(this,"打开文件",FileDialogLOAD);

openfilesetVisible(false);

openfileaddWindowListener(new WindowAdapter(){

public void windowClosing(WindowEvent e){

openfilesetVisible(false);

}

});

sizechoice=new Choice();

sizechoiceadd("1");

sizechoiceadd("2");

sizechoiceadd("4");

sizechoiceadd("6");

sizechoiceadd("8");

sizechoiceaddItemListener(this);

colorchoice=new Choice();

colorchoiceadd("black");

colorchoiceadd("red");

colorchoiceadd("blue");

colorchoiceadd("green");

colorchoiceaddItemListener(this);

penaddActionListener(this);

lineaddActionListener(this);

ellipseaddActionListener(this);

rectaddActionListener(this);

clearaddActionListener(this);

colorboardaddActionListener(this);

storebuttonaddActionListener(this);

openbuttonaddActionListener(this);

panel=new Panel();

paneladd(storebutton);

paneladd(openbutton);

paneladd(pen);

paneladd(line);

paneladd(ellipse);

paneladd(rect);

paneladd(clear);

paneladd(sizechoice);

paneladd(pensize);

paneladd(colorchoice);

paneladd(pencolor);

paneladd(colorboard);

add(panel,BorderLayoutNORTH);

setBounds(100,100,700,600);

setVisible(true);

addWindowListener(new WindowAdapter(){

public void windowClosing(WindowEvent e){

Systemexit(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

gclearRect(0,0,getSize()width,getSize()height);

}

for(int i=0;i<pointssize()-1;i++){

p1=(OnePoint)pointselementAt(i);

p2=(OnePoint)pointselementAt(i+1);

g2dsetColor(p1c); //////////////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(p1border,BasicStrokeCAP_BUTT,BasicStrokeJOIN_BEVEL);

g2dsetStroke(size);

if(p1tool==p2tool){

switch(p1tool){

case 0:

Line2DDouble line1=new Line2DDouble(p1x,p1y,p2x,p2y);

g2ddraw(line1);

break;

case 1:

Line2DDouble line2=new Line2DDouble(p1x,p1y,p2x,p2y);

g2ddraw(line2);

break;

case 3:

Ellipse2DDouble ellipse=new Ellipse2DDouble(p1x,p1y,Mathabs(p2x-p1x),Mathabs(p2y-p1y));

g2ddraw(ellipse);

break;

case 4:

Rectangle2DDouble rect=new Rectangle2DDouble(p1x,p1y,Mathabs(p2x-p1x),Mathabs(p2y-p1y));

g2ddraw(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

OnePoint pp1=new OnePoint(egetX(),egetY(),flagtool,flagcolor,border);

pointsaddElement(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

if(flagtool==0){

pointsaddElement(new OnePoint(-1,-1,22,flagcolor,border));

}

else{

OnePoint pp2=new OnePoint(egetX(),egetY(),flagtool,flagcolor,border);

pointsaddElement(pp2);

pointsadd(new OnePoint(-1,-1,22,flagcolor,border));

}

repaint();

}

public void itemStateChanged(ItemEvent e) {

if(egetSource()==colorchoice){

String selected=colorchoicegetSelectedItem();

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(egetSource()==sizechoice){

String selected=sizechoicegetSelectedItem();

if (selected=="1"){

border=1;

}

else if(selected=="2"){

border=22;

}

else if(selected=="4"){

border=42;

}

else if(selected=="6"){

border=62;

}

else if(selected=="8"){

border=82;

}

public void update(Graphics g) { //@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

paint(g);

}

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

if(egetSource()==pen){

flagtool=0;

}

else if(egetSource()==line){

flagtool=1;

}

else if(egetSource()==clear){

flagtool=2;

pointsremoveAllElements();

repaint(); //此语要有，否则今生无法删除！

}

else if(egetSource()==ellipse){

flagtool=3;

}

else if(egetSource()==rect){

flagtool=4;

}

else if(egetSource()==colorboard){

使用 javaxswing×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=JColorChoosershowDialog(this, "调色板",flagcolor);

flagcolor=color;

}

else if(egetSource()==openbutton){

openfilesetVisible(true);

if(openfilegetFile()!=null){

int temp=flagtool;

flagtool=2;

repaint();

try{

pointsremoveAllElements();

File file=new File(openfilegetDirectory(),openfilegetFile());

filein=new FileInputStream(file);

objectin=new ObjectInputStream(filein);

points=(Vector)objectinreadObject();

objectinclose();

fileinclose();

flagtool=temp;

repaint();

}

catch(Exception ee){

Systemoutprintln(eetoString());

}

else if(egetSource()==storebutton){

storefilesetVisible(true);

if(storefilegetFile()!=null){

try {

File file=new File(storefilegetDirectory(),storefilegetFile());

fileout=new FileOutputStream(file);

objectout=new ObjectOutputStream(fileout);

objectoutwriteObject(points);

objectoutclose();

fileoutclose();

repaint();

}

catch (FileNotFoundException e1) {

Systemoutprintln(e1toString());

e1printStackTrace();

} catch (IOException ee) {

Systemoutprintln(eetoString());

eeprintStackTrace();

}

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(egetX(),egetY(),flagtool,flagcolor,border);

pointsaddElement(pp3);

repaint();

}

public void mouseMoved(MouseEvent e) {

// TODO Auto-generated method stub

}

public class PaintBoard{

public static void main(String[] args){

DrawingBoard oneBorder=new DrawingBoard();

}

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;