java課程設計模擬畫圖

㈠ 怎麼用java代碼模擬一張圖片

用java代碼模擬一張圖片可以這信運樣操作：1.創建BufferedImage類
2.根據BufferedImage類得到一個Graphics2D對象
3.根據Graphics2D對象進行邏輯操作
4.處理繪圖
5.將繪制好滑脊樑的野沖圖片寫入到圖片

㈡ 用JAVA模擬畫圖操作

哥們，寧大的吧，這題我也在網路

㈢ 如何實現用java實現下圖所示的圖形，急用~~~~

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Polygon;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class DrawDemo extends JPanel {

public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;

// 畫大矩形
g2d.drawRect(10, 15, 200, 200);
// 小矩形
g2d.drawRect(15, 20, 90, 60);
g2d.drawRect(20, 30, 50, 40);

Polygon p = new Polygon();
p.addPoint(80,40);
p.addPoint(80,60);
p.addPoint(100,50);
g2d.drawPolygon(p);
}

public static void main(String[] args) {
DrawDemo rects = new DrawDemo();
JFrame frame = new JFrame("畫圖");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(rects);
frame.setSize(500, 400);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}

}
參考這個！

㈣ java 實現 簡單畫圖功能(簡單點的)

樓主給你一個我編的，直接保存成pb.java編譯運行，就是你要的畫圖功能
____________________________________________________________________

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

class Point implements Serializable
{
int x,y;
Color col;
int tool;
int boarder;

Point(int x, int y, Color col, int tool, int boarder)
{
this.x = x;
this.y = y;
this.col = col;
this.tool = tool;
this.boarder = boarder;
}
}

class paintboard extends Frame implements ActionListener,MouseMotionListener,MouseListener,ItemListener
{
int x = -1, y = -1;
int con = 1;//畫筆大小
int Econ = 5;//橡皮大小

int toolFlag = 0;//toolFlag:工具標記
//toolFlag工具對應表：
//（0--畫筆）；（1--橡皮）；（2--清除）；
//（3--直線）；（4--圓）；（5--矩形）；

Color c = new Color(0,0,0); //畫筆顏色
BasicStroke size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);//畫筆粗細
Point cutflag = new Point(-1, -1, c, 6, con);//截斷標志

Vector paintInfo = null;//點信息向量組
int n = 1;

FileInputStream picIn = null;
FileOutputStream picOut = null;

ObjectInputStream VIn = null;
ObjectOutputStream VOut = null;

// *工具面板--畫筆，直線，圓，矩形，多邊形,橡皮，清除*/
Panel toolPanel;
Button eraser, drLine,drCircle,drRect;
Button clear ,pen;
Choice ColChoice,SizeChoice,EraserChoice;
Button colchooser;
Label 顏色,大小B,大小E;
//保存功能
Button openPic,savePic;
FileDialog openPicture,savePicture;

paintboard(String s)
{
super(s);
addMouseMotionListener(this);
addMouseListener(this);

paintInfo = new Vector();

/*各工具按鈕及選擇項*/
//顏色選擇
ColChoice = new Choice();
ColChoice.add("black");
ColChoice.add("red");
ColChoice.add("blue");
ColChoice.add("green");
ColChoice.addItemListener(this);
//畫筆大小選擇
SizeChoice = new Choice();
SizeChoice.add("1");
SizeChoice.add("3");
SizeChoice.add("5");
SizeChoice.add("7");
SizeChoice.add("9");
SizeChoice.addItemListener(this);
//橡皮大小選擇
EraserChoice = new Choice();
EraserChoice.add("5");
EraserChoice.add("9");
EraserChoice.add("13");
EraserChoice.add("17");
EraserChoice.addItemListener(this);
////////////////////////////////////////////////////
toolPanel = new Panel();

clear = new Button("清除");
eraser = new Button("橡皮");
pen = new Button("畫筆");
drLine = new Button("畫直線");
drCircle = new Button("畫圓形");
drRect = new Button("畫矩形");

openPic = new Button("打開圖畫");
savePic = new Button("保存圖畫");

colchooser = new Button("顯示調色板");

//各組件事件監聽
clear.addActionListener(this);
eraser.addActionListener(this);
pen.addActionListener(this);
drLine.addActionListener(this);
drCircle.addActionListener(this);
drRect.addActionListener(this);
openPic.addActionListener(this);
savePic.addActionListener(this);
colchooser.addActionListener(this);

顏色 = new Label("畫筆顏色",Label.CENTER);
大小B = new Label("畫筆大小",Label.CENTER);
大小E = new Label("橡皮大小",Label.CENTER);
//面板添加組件
toolPanel.add(openPic);
toolPanel.add(savePic);

toolPanel.add(pen);
toolPanel.add(drLine);
toolPanel.add(drCircle);
toolPanel.add(drRect);

toolPanel.add(顏色); toolPanel.add(ColChoice);
toolPanel.add(大小B); toolPanel.add(SizeChoice);
toolPanel.add(colchooser);

toolPanel.add(eraser);
toolPanel.add(大小E); toolPanel.add(EraserChoice);

toolPanel.add(clear);
//工具面板到APPLET面板
add(toolPanel,BorderLayout.NORTH);

setBounds(60,60,900,600); setVisible(true);
validate();
//dialog for save and load

openPicture = new FileDialog(this,"打開圖畫",FileDialog.LOAD);
openPicture.setVisible(false);
savePicture = new FileDialog(this,"保存圖畫",FileDialog.SAVE);
savePicture.setVisible(false);

openPicture.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{ openPicture.setVisible(false); }
});

savePicture.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{ savePicture.setVisible(false); }
});

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

}

public void paint(Graphics g)
{
Graphics2D g2d = (Graphics2D)g;

Point p1,p2;

n = paintInfo.size();

if(toolFlag==2)
g.clearRect(0,0,getSize().width,getSize().height);//清除

for(int i=0; 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://畫筆

Line2D line1 = new Line2D.Double(p1.x, p1.y, p2.x, p2.y);
g2d.draw(line1);
break;

case 1://橡皮
g.clearRect(p1.x, p1.y, p1.boarder, p1.boarder);
break;

case 3://畫直線
Line2D line2 = new Line2D.Double(p1.x, p1.y, p2.x, p2.y);
g2d.draw(line2);
break;

case 4://畫圓
Ellipse2D ellipse = new Ellipse2D.Double(p1.x, p1.y, Math.abs(p2.x-p1.x) , Math.abs(p2.y-p1.y));
g2d.draw(ellipse);
break;

case 5://畫矩形
Rectangle2D rect = new Rectangle2D.Double(p1.x, p1.y, Math.abs(p2.x-p1.x) , Math.abs(p2.y-p1.y));
g2d.draw(rect);
break;

case 6://截斷，跳過
i=i+1;
break;

default :
}//end switch
}//end if
}//end for
}

public void itemStateChanged(ItemEvent e)
{
if(e.getSource()==ColChoice)//預選顏色
{
String name = ColChoice.getSelectedItem();

if(name=="black")
{c = new Color(0,0,0); }
else if(name=="red")
{c = new Color(255,0,0);}
else if(name=="green")
{c = new Color(0,255,0);}
else if(name=="blue")
{c = new Color(0,0,255);}
}
else if(e.getSource()==SizeChoice)//畫筆大小
{
String selected = SizeChoice.getSelectedItem();

if(selected=="1")
{
con = 1;
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);

}
else if(selected=="3")
{
con = 3;
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);

}
else if(selected=="5")
{con = 5;
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);

}
else if(selected=="7")
{con = 7;
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);

}
else if(selected=="9")
{con = 9;
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);

}
}
else if(e.getSource()==EraserChoice)//橡皮大小
{
String Esize = EraserChoice.getSelectedItem();

if(Esize=="5")
{ Econ = 5*2; }
else if(Esize=="9")
{ Econ = 9*2; }
else if(Esize=="13")
{ Econ = 13*2; }
else if(Esize=="17")
{ Econ = 17*3; }

}

}

public void mouseDragged(MouseEvent e)
{
Point p1 ;
switch(toolFlag){
case 0://畫筆
x = (int)e.getX();
y = (int)e.getY();
p1 = new Point(x, y, c, toolFlag, con);
paintInfo.addElement(p1);
repaint();
break;

case 1://橡皮
x = (int)e.getX();
y = (int)e.getY();
p1 = new Point(x, y, null, toolFlag, Econ);
paintInfo.addElement(p1);
repaint();
break;

default :
}
}

public void mouseMoved(MouseEvent e) {}

public void update(Graphics g)
{
paint(g);
}

public void mousePressed(MouseEvent e)
{
Point p2;
switch(toolFlag){
case 3://直線
x = (int)e.getX();
y = (int)e.getY();
p2 = new Point(x, y, c, toolFlag, con);
paintInfo.addElement(p2);
break;

case 4: //圓
x = (int)e.getX();
y = (int)e.getY();
p2 = new Point(x, y, c, toolFlag, con);
paintInfo.addElement(p2);
break;

case 5: //矩形
x = (int)e.getX();
y = (int)e.getY();
p2 = new Point(x, y, c, toolFlag, con);
paintInfo.addElement(p2);
break;

default :
}
}

public void mouseReleased(MouseEvent e)
{
Point p3;
switch(toolFlag){
case 0://畫筆
paintInfo.addElement(cutflag);
break;

case 1: //eraser
paintInfo.addElement(cutflag);
break;

case 3://直線
x = (int)e.getX();
y = (int)e.getY();
p3 = new Point(x, y, c, toolFlag, con);
paintInfo.addElement(p3);
paintInfo.addElement(cutflag);
repaint();
break;

case 4: //圓
x = (int)e.getX();
y = (int)e.getY();
p3 = new Point(x, y, c, toolFlag, con);
paintInfo.addElement(p3);
paintInfo.addElement(cutflag);
repaint();
break;

case 5: //矩形
x = (int)e.getX();
y = (int)e.getY();
p3 = new Point(x, y, c, toolFlag, con);
paintInfo.addElement(p3);
paintInfo.addElement(cutflag);
repaint();
break;

default:
}
}

public void mouseEntered(MouseEvent e){}

public void mouseExited(MouseEvent e){}

public void mouseClicked(MouseEvent e){}

public void actionPerformed(ActionEvent e)
{

if(e.getSource()==pen)//畫筆
{toolFlag = 0;}

if(e.getSource()==eraser)//橡皮
{toolFlag = 1;}

if(e.getSource()==clear)//清除
{
toolFlag = 2;
paintInfo.removeAllElements();
repaint();
}

if(e.getSource()==drLine)//畫線
{toolFlag = 3;}

if(e.getSource()==drCircle)//畫圓
{toolFlag = 4;}

if(e.getSource()==drRect)//畫矩形
{toolFlag = 5;}

if(e.getSource()==colchooser)//調色板
{
Color newColor = JColorChooser.showDialog(this,"調色板",c);
c = newColor;
}

if(e.getSource()==openPic)//打開圖畫
{

openPicture.setVisible(true);

if(openPicture.getFile()!=null)
{
int tempflag;
tempflag = toolFlag;
toolFlag = 2 ;
repaint();

try{
paintInfo.removeAllElements();
File filein = new File(openPicture.getDirectory(),openPicture.getFile());
picIn = new FileInputStream(filein);
VIn = new ObjectInputStream(picIn);
paintInfo = (Vector)VIn.readObject();
VIn.close();
repaint();
toolFlag = tempflag;

}

catch(ClassNotFoundException IOe2)
{
repaint();
toolFlag = tempflag;
System.out.println("can not read object");
}
catch(IOException IOe)
{
repaint();
toolFlag = tempflag;
System.out.println("can not read file");
}
}

}

if(e.getSource()==savePic)//保存圖畫
{
savePicture.setVisible(true);
try{
File fileout = new File(savePicture.getDirectory(),savePicture.getFile());
picOut = new FileOutputStream(fileout);
VOut = new ObjectOutputStream(picOut);
VOut.writeObject(paintInfo);
VOut.close();
}
catch(IOException IOe)
{
System.out.println("can not write object");
}

}
}
}//end paintboard

public class pb
{
public static void main(String args[])
{ new paintboard("畫圖程序"); }
}

㈤ Java畫圖

看來你從未動過手解決未知問題，只會做練習？

這里已經提示了怎麼做，你只需要先了解基本的Swing中的JLabel/JFrame怎麼用，然後自己自己做一個EllipseComponent覆蓋它的paintComponent(Graphicsg)方法，使用一個像Eclipse這樣的開發工具IDE，在g後面打個點就有提示這個Graphics有什麼方法可用，裡面就有2D繪圖的方法。

importjava.awt.Color;
importjava.awt.Dimension;
importjava.awt.EventQueue;
importjava.awt.Graphics;
importjava.awt.Rectangle;
importjava.awt.event.ComponentAdapter;
importjava.awt.event.ComponentEvent;

importjavax.swing.JFrame;
importjavax.swing.JPanel;
importjavax.swing.UIManager;

{

=5929654695935454925L;

publicstaticvoidmain(String[]args){
try{
UIManager.setLookAndFeel(UIManager
.());
}catch(Exceptione){
e.printStackTrace();
}
EventQueue.invokeLater(newRunnable(){
publicvoidrun(){
EllipseViewerapp=newEllipseViewer();
}
});
}

privateJPanelpanel;

publicEllipseViewer(){
add(getPanel());
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setVisible(true);
addComponentListener(newComponentAdapter(){
@Override
publicvoidcomponentResized(ComponentEvente){
System.out.println("WindowResized:Frame");
}
});
}

publicJPanelgetPanel(){
if(panel==null){
panel=newEllipseComponent();
panel.setPreferredSize(newDimension(300,200));
panel.setBackground(Color.RED);
}
returnpanel;
}

{

=-1744557274793554529L;

protectedvoidpaintComponent(Graphicsg){
System.out.println("Paintcomponent");
RectangleclientArea=this.getBounds();

intheight=clientArea.height-1;
intwidth=clientArea.width-1;

//setforegroundcolor
g.setColor(Color.BLACK);

//drawcycle/ellipse
g.drawOval(0,0,width,height);

//setforegroundcolor
g.setColor(Color.ORANGE);

//fillit,wegive1pixelaslinewidth.
g.fillOval(1,1,width-2,height-2);
}

}
}

㈥ 用java編寫一個簡單的畫圖程序。不用復雜

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import javax.swing.*;

//不規則圖形的繪制

public class IrregularShapeDemo extends JFrame {

GeneralPath gPath= new GeneralPath(); //GeneralPath對象實例
Point aPoint;

//構造函數
public IrregularShapeDemo() {
super("不規則圖形的繪制"); //調用父類構造函數
enableEvents(AWTEvent.MOUSE_EVENT_MASK|AWTEvent.MOUSE_MOTION_EVENT_MASK); //允許事件

setSize(300, 200); //設置窗口尺寸
setVisible(true); //設置窗口可視
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //關閉窗口時退出程序
}

public void paint(Graphics g) { //重載窗口組件的paint()方法
Graphics2D g2D = (Graphics2D)g; //獲取圖形環境
g2D.draw(gPath); //繪制路徑
}

public static void main(String[] args) {
new IrregularShapeDemo();
}

protected void processMouseEvent(MouseEvent e) { //滑鼠事件處理
if(e.getID() == MouseEvent.MOUSE_PRESSED) {
aPoint = e.getPoint(); //得到當前滑鼠點
gPath = new GeneralPath(); //重新實例化GeneralPath對象
gPath.moveTo(aPoint.x,aPoint.y); //設置路徑點
}
}

protected void processMouseMotionEvent(MouseEvent e) { //滑鼠運動事件處理
if(e.getID() == MouseEvent.MOUSE_DRAGGED) {
aPoint = e.getPoint(); //得到當前滑鼠點
gPath.lineTo(aPoint.x, aPoint.y); //設置路徑
gPath.moveTo(aPoint.x, aPoint.y);
repaint(); //重繪組件
}
}
}

㈦ JAVA實現簡單的畫圖板

樓主寫一個html，很容易把下面代碼嵌入到applet，可以google一下實現，
還有自己不知道算不算復制。。。-_-!
--------------------------------------------------------------------
樓主給你一個我的，直接保存成pb.java編譯運行，就是你要的畫圖功能 ，可以參考一下
____________________________________________________________________

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;//畫筆大小
int Econ = 5;//橡皮大小

int toolFlag = 0;//toolFlag:工具標記
//toolFlag工具對應表：
//（0--畫筆）；（1--橡皮）；（2--清除）；
//（3--直線）；（4--圓）；（5--矩形）；

Color c = new Color(0,0,0); //畫筆顏色
BasicStroke size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);//畫筆粗細
Point cutflag = new Point(-1, -1, c, 6, con);//截斷標志

Vector paintInfo = null;//點信息向量組
int n = 1;

FileInputStream picIn = null;
FileOutputStream picOut = null;

ObjectInputStream VIn = null;
ObjectOutputStream VOut = null;

// *工具面板--畫筆，直線，圓，矩形，多邊形,橡皮，清除*/
Panel toolPanel;
Button eraser, drLine,drCircle,drRect;
Button clear ,pen;
Choice ColChoice,SizeChoice,EraserChoice;
Button colchooser;
Label 顏色,大小B,大小E;
//保存功能
Button openPic,savePic;
FileDialog openPicture,savePicture;

paintboard(String s)
{
super(s);
addMouseMotionListener(this);
addMouseListener(this);

paintInfo = new Vector();

/*各工具按鈕及選擇項*/
//顏色選擇
ColChoice = new Choice();
ColChoice.add("black");
ColChoice.add("red");
ColChoice.add("blue");
ColChoice.add("green");
ColChoice.addItemListener(this);
//畫筆大小選擇
SizeChoice = new Choice();
SizeChoice.add("1");
SizeChoice.add("3");
SizeChoice.add("5");
SizeChoice.add("7");
SizeChoice.add("9");
SizeChoice.addItemListener(this);
//橡皮大小選擇
EraserChoice = new Choice();
EraserChoice.add("5");
EraserChoice.add("9");
EraserChoice.add("13");
EraserChoice.add("17");
EraserChoice.addItemListener(this);
////////////////////////////////////////////////////
toolPanel = new Panel();

clear = new Button("清除");
eraser = new Button("橡皮");
pen = new Button("畫筆");
drLine = new Button("畫直線");
drCircle = new Button("畫圓形");
drRect = new Button("畫矩形");

openPic = new Button("打開圖畫");
savePic = new Button("保存圖畫");

colchooser = new Button("顯示調色板");

//各組件事件監聽
clear.addActionListener(this);
eraser.addActionListener(this);
pen.addActionListener(this);
drLine.addActionListener(this);
drCircle.addActionListener(this);
drRect.addActionListener(this);
openPic.addActionListener(this);
savePic.addActionListener(this);
colchooser.addActionListener(this);

顏色 = new Label("畫筆顏色",Label.CENTER);
大小B = new Label("畫筆大小",Label.CENTER);
大小E = new Label("橡皮大小",Label.CENTER);
//面板添加組件
toolPanel.add(openPic);
toolPanel.add(savePic);

toolPanel.add(pen);
toolPanel.add(drLine);
toolPanel.add(drCircle);
toolPanel.add(drRect);

toolPanel.add(顏色); toolPanel.add(ColChoice);
toolPanel.add(大小B); toolPanel.add(SizeChoice);
toolPanel.add(colchooser);

toolPanel.add(eraser);
toolPanel.add(大小E); toolPanel.add(EraserChoice);

toolPanel.add(clear);
//工具面板到APPLET面板
add(toolPanel,BorderLayout.NORTH);

setBounds(60,60,900,600); setVisible(true);
validate();
//dialog for save and load

openPicture = new FileDialog(this,"打開圖畫",FileDialog.LOAD);
openPicture.setVisible(false);
savePicture = new FileDialog(this,"保存圖畫",FileDialog.SAVE);
savePicture.setVisible(false);

openPicture.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{ openPicture.setVisible(false); }
});

savePicture.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{ savePicture.setVisible(false); }
});

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

}

public void paint(Graphics g)
{
Graphics2D g2d = (Graphics2D)g;

Point p1,p2;

n = paintInfo.size();

if(toolFlag==2)
g.clearRect(0,0,getSize().width,getSize().height);//清除

for(int i=0; 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://畫筆

Line2D line1 = new Line2D.Double(p1.x, p1.y, p2.x, p2.y);
g2d.draw(line1);
break;

case 1://橡皮
g.clearRect(p1.x, p1.y, p1.boarder, p1.boarder);
break;

case 3://畫直線
Line2D line2 = new Line2D.Double(p1.x, p1.y, p2.x, p2.y);
g2d.draw(line2);
break;

case 4://畫圓
Ellipse2D ellipse = new Ellipse2D.Double(p1.x, p1.y, Math.abs(p2.x-p1.x) , Math.abs(p2.y-p1.y));
g2d.draw(ellipse);
break;

case 5://畫矩形
Rectangle2D rect = new Rectangle2D.Double(p1.x, p1.y, Math.abs(p2.x-p1.x) , Math.abs(p2.y-p1.y));
g2d.draw(rect);
break;

case 6://截斷，跳過
i=i+1;
break;

default :
}//end switch
}//end if
}//end for
}

public void itemStateChanged(ItemEvent e)
{
if(e.getSource()==ColChoice)//預選顏色
{
String name = ColChoice.getSelectedItem();

if(name=="black")
{c = new Color(0,0,0); }
else if(name=="red")
{c = new Color(255,0,0);}
else if(name=="green")
{c = new Color(0,255,0);}
else if(name=="blue")
{c = new Color(0,0,255);}
}
else if(e.getSource()==SizeChoice)//畫筆大小
{
String selected = SizeChoice.getSelectedItem();

if(selected=="1")
{
con = 1;
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);

}
else if(selected=="3")
{
con = 3;
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);

}
else if(selected=="5")
{con = 5;
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);

}
else if(selected=="7")
{con = 7;
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);

}
else if(selected=="9")
{con = 9;
size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);

}
}
else if(e.getSource()==EraserChoice)//橡皮大小
{
String Esize = EraserChoice.getSelectedItem();

if(Esize=="5")
{ Econ = 5*2; }
else if(Esize=="9")
{ Econ = 9*2; }
else if(Esize=="13")
{ Econ = 13*2; }
else if(Esize=="17")
{ Econ = 17*3; }

}

}

public void mouseDragged(MouseEvent e)
{
Point p1 ;
switch(toolFlag){
case 0://畫筆
x = (int)e.getX();
y = (int)e.getY();
p1 = new Point(x, y, c, toolFlag, con);
paintInfo.addElement(p1);
repaint();
break;

case 1://橡皮
x = (int)e.getX();
y = (int)e.getY();
p1 = new Point(x, y, null, toolFlag, Econ);
paintInfo.addElement(p1);
repaint();
break;

default :
}
}

public void mouseMoved(MouseEvent e) {}

public void update(Graphics g)
{
paint(g);
}

public void mousePressed(MouseEvent e)
{
Point p2;
switch(toolFlag){
case 3://直線
x = (int)e.getX();
y = (int)e.getY();
p2 = new Point(x, y, c, toolFlag, con);
paintInfo.addElement(p2);
break;

case 4: //圓
x = (int)e.getX();
y = (int)e.getY();
p2 = new Point(x, y, c, toolFlag, con);
paintInfo.addElement(p2);
break;

case 5: //矩形
x = (int)e.getX();
y = (int)e.getY();
p2 = new Point(x, y, c, toolFlag, con);
paintInfo.addElement(p2);
break;

default :
}
}

public void mouseReleased(MouseEvent e)
{
Point p3;
switch(toolFlag){
case 0://畫筆
paintInfo.addElement(cutflag);
break;

case 1: //eraser
paintInfo.addElement(cutflag);
break;

case 3://直線
x = (int)e.getX();
y = (int)e.getY();
p3 = new Point(x, y, c, toolFlag, con);
paintInfo.addElement(p3);
paintInfo.addElement(cutflag);
repaint();
break;

case 4: //圓
x = (int)e.getX();
y = (int)e.getY();
p3 = new Point(x, y, c, toolFlag, con);
paintInfo.addElement(p3);
paintInfo.addElement(cutflag);
repaint();
break;

case 5: //矩形
x = (int)e.getX();
y = (int)e.getY();
p3 = new Point(x, y, c, toolFlag, con);
paintInfo.addElement(p3);
paintInfo.addElement(cutflag);
repaint();
break;

default:
}
}

public void mouseEntered(MouseEvent e){}

public void mouseExited(MouseEvent e){}

public void mouseClicked(MouseEvent e){}

public void actionPerformed(ActionEvent e)
{

if(e.getSource()==pen)//畫筆
{toolFlag = 0;}

if(e.getSource()==eraser)//橡皮
{toolFlag = 1;}

if(e.getSource()==clear)//清除
{
toolFlag = 2;
paintInfo.removeAllElements();
repaint();
}

if(e.getSource()==drLine)//畫線
{toolFlag = 3;}

if(e.getSource()==drCircle)//畫圓
{toolFlag = 4;}

if(e.getSource()==drRect)//畫矩形
{toolFlag = 5;}

if(e.getSource()==colchooser)//調色板
{
Color newColor = JColorChooser.showDialog(this,"調色板",c);
c = newColor;
}

if(e.getSource()==openPic)//打開圖畫
{

openPicture.setVisible(true);

if(openPicture.getFile()!=null)
{
int tempflag;
tempflag = toolFlag;
toolFlag = 2 ;
repaint();

try{
paintInfo.removeAllElements();
File filein = new File(openPicture.getDirectory(),openPicture.getFile());
picIn = new FileInputStream(filein);
VIn = new ObjectInputStream(picIn);
paintInfo = (Vector)VIn.readObject();
VIn.close();
repaint();
toolFlag = tempflag;

}

catch(ClassNotFoundException IOe2)
{
repaint();
toolFlag = tempflag;
System.out.println("can not read object");
}
catch(IOException IOe)
{
repaint();
toolFlag = tempflag;
System.out.println("can not read file");
}
}

}

if(e.getSource()==savePic)//保存圖畫
{
savePicture.setVisible(true);
try{
File fileout = new File(savePicture.getDirectory(),savePicture.getFile());
picOut = new FileOutputStream(fileout);
VOut = new ObjectOutputStream(picOut);
VOut.writeObject(paintInfo);
VOut.close();
}
catch(IOException IOe)
{
System.out.println("can not write object");
}

}
}
}//end paintboard

public class pb
{
public static void main(String args[])
{ new paintboard("畫圖程序"); }
}

㈧ 用Java一個簡單的畫圖程序

簡單啊，先引入相應的組件包import java.awt.*;import java.awt.event.*;import javax.swing.*;寫的類要繼承JFrame 接下來就是調用剛剛引入包版裡面的方法了，權paint();這是就思路了。

㈨ 求以java程序代碼 題目：畫圖程序

面板的

PainterPanel.java

importjava.awt.*;

importjava.awt.event.*;

importjavax.swing.*;

importjavax.swing.event.*;

{

intshape=-1;//圖案類型

Point[]point=newPoint[2];//記錄滑鼠拖動的起始點和終點

publicPainterPanel(){

super(); //調用父類構造函數

this.setBackground(Color.white);//設置背景顏色

point[0]=newPoint(-1,-1);//初始化變數

point[1]=newPoint(-1,-1);

addMouseListener(this);//增加滑鼠事件

}

publicvoidmouseReleased(MouseEvente){//滑鼠釋放事件

point[1]=newPoint(e.getX(),e.getY()); //設置終點位置

repaint();//重繪屏幕

}

publicvoidmouseEntered(MouseEvente){}

publicvoidmouseExited(MouseEvente){}

publicvoidmouseClicked(MouseEvente){}

publicvoidmousePressed(MouseEvente){//滑鼠按下時事件

point[0]=newPoint(e.getX(),e.getY());//設置起始點位置

}

publicvoidpaint(Graphicsg){

super.paint(g);

switch(shape){//根據shape值繪制圖形

case0:

g.drawLine(point[0].x,point[0].y,point[1].x,point[1].y);//繪線

break;

case1:

intwidth=point[1].x-point[0].x;

intheight=point[1].y-point[0].y;

g.drawOval(point[0].x,point[0].y,width,height);//繪橢圓

break;

case2:

width=point[1].x-point[0].x;

height=point[1].y-point[0].y;

g.drawRect(point[0].x,point[0].y,width,height);//繪矩形

break;

}

}

publicvoiddrawShape(intshape){

this.shape=shape;

}

}

PainterDemo.java

importjava.awt.*;

importjava.awt.event.*;

importjavax.swing.*;

importjavax.swing.event.*;

{

JToggleButton[]button=newJToggleButton[3];//按鈕組

PainterPanelpainter=newPainterPanel();//繪圖面板

publicPainterDemo(){

super("Java畫圖程序");//調用父類構造函數

String[]buttonName={"直線","橢圓","矩形"};//按鈕文字

=newDrawShapeListener();//按鈕事件

JToolBartoolBar=newJToolBar();//實例化工具欄

ButtonGroupbuttonGroup=newButtonGroup();//實例化按鈕組

for(inti=0;i<button.length;i++){

button[i]=newJToggleButton(buttonName[i]);//實例化按鈕

button[i].addActionListener(buttonListener);//增加按鈕事件處理

buttonGroup.add(button[i]);//增加按鈕到按鈕組

toolBar.add(button[i]); //增加按鈕到工具欄

}

Containercontainer=getContentPane();//得到窗口容器

container.add(toolBar,BorderLayout.NORTH);//增加組件到容器上

container.add(painter,BorderLayout.CENTER);

setSize(300,200);//設置窗口尺寸

setVisible(true);//設置窗口為可視

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//關閉窗口時退出程序

}

{//按鈕事件處理

publicvoidactionPerformed(ActionEvente){

for(inti=0;i<button.length;i++){

if(e.getSource()==button[i]){//判斷來自於哪個按鈕

painter.drawShape(i);//繪制圖形

}

}

}

}

publicstaticvoidmain(String[]args){

newPainterDemo();

}

}