① java畫圖板程序文件部分,請幫忙注釋下
//打開一個圖形文件程序段
public void loadFile()
{
JFileChooser fileChooser=new JFileChooser();
fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
int result =fileChooser.showOpenDialog(this);
if(result==JFileChooser.CANCEL_OPTION)
return ;
File fileName=fileChooser.getSelectedFile();
fileName.canRead();
if (fileName==null||fileName.getName().equals(""))
JOptionPane.showMessageDialog(fileChooser,"Invalid File Name",
"Invalid File Name", JOptionPane.ERROR_MESSAGE);
else {
try {
FileInputStream fis=new FileInputStream(fileName);
input=new ObjectInputStream(fis);
drawings inputRecord;
int countNumber=0;
countNumber=input.readInt();
for(index=0;index< countNumber ;index++)
{
inputRecord=(drawings)input.readObject();
itemList[ index ] = inputRecord ;
}
createNewItem ;
input.close();
repaint();
}
catch(EOFException endofFileException){
JOptionPane.showMessageDialog(this,"no more record in file",
"class not found",JOptionPane.ERROR_MESSAGE );
}
catch(ClassNotFoundException classNotFoundException){
JOptionPane.showMessageDialog(this,"Unable to Create Object",
"end of file",JOptionPane.ERROR_MESSAGE );
}
catch (IOException ioException){
JOptionPane.showMessageDialog(this,"error ring read from file",
"read Error",JOptionPane.ERROR_MESSAGE );
}
}
}
② 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。。。-_-!
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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"); }
}
③ java編制一個具有如下界面的畫板, 能進行基本圖形的繪制。
package bd;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class DrawingBoard extends JFrame{
int[] xPoint={200,300,500};
int[] yPoint={100,180,240};
static int m=15;
static Color color=new Color(255,0,0);
private JComboBox jcb2=new JComboBox(new Object[]{
" 20"," 28"," 36"," 44"," 52"," 72 "
});
private JComboBox jcb3=new JComboBox(new Object[]{
"紅色","黑色","藍色","綠色"
});
public DrawingBoard(){
JMenuBar Bar=new JMenuBar();
JMenu jmFile=new JMenu("文件");
JMenuItem jmi1=new JMenuItem("新建");
JMenuItem jmi2=new JMenuItem("打開");
JMenuItem jmi3=new JMenuItem("保存");
JMenuItem jmi4=new JMenuItem("退出");
jmFile.add(jmi1);
jmFile.add(jmi2);
jmFile.add(jmi3);
jmFile.add(jmi4);
JLabel jlb1=new JLabel("線條");
JLabel jlb2=new JLabel("線寬");
JLabel jlb3=new JLabel("顏色");
final JComboBox jcb1=new JComboBox(new Object[]{
"實線","虛線"
});
JButton jbt0=new JButton("直線");
JButton jbt1=new JButton("三角形");
JButton jbt2=new JButton("圓");
JButton jbt3=new JButton("矩形");
JPanel jp1=new JPanel();
jp1.add(jlb1);
jp1.add(jcb1);
jp1.add(jlb2);
jp1.add(jcb2);
jp1.add(jlb3);
jp1.add(jcb3);
jp1.add(jbt0);
jp1.add(jbt1);
jp1.add(jbt2);
jp1.add(jbt3);
final DrawingPanel jp2=new DrawingPanel();
jp2.setBackground(Color.white);
jp2.setPreferredSize(new Dimension(736,300));
this.add(Bar);
this.add(jp1,BorderLayout.CENTER);
this.add(jp2,BorderLayout.SOUTH);
jcb1.addItemListener(new ItemListener(){
public void itemStateChanged(ItemEvent e){
if(jcb1.getSelectedItem()=="實線"){
Graphics g=jp2.getGraphics();
g.drawLine(10,10,736,10);
}
if(jcb1.getSelectedItem()=="虛線"){
Graphics g=jp2.getGraphics();
for(int i=1;i<100;i++){
g.drawLine(6*i-6,50,6*i-3,50);
}
}
}
});
jcb2.addItemListener(new ItemListener(){
public void itemStateChanged(ItemEvent e){
if(jcb2.getSelectedItem()==" 20"){
m=20;
repaint();
}
if(jcb2.getSelectedItem()==" 28"){
m=28;repaint();
}
if(jcb2.getSelectedItem()==" 36"){
m=36;repaint();
}
if(jcb2.getSelectedItem()==" 44"){
m=44;repaint();
}
if(jcb2.getSelectedItem()==" 52"){
m=52;repaint();
}
if(jcb2.getSelectedItem()==" 72 "){
m=72;repaint();
}
}
});
jcb3.addItemListener(new ItemListener(){
public void itemStateChanged(ItemEvent e){
if(jcb3.getSelectedItem()=="紅色"){
color=new Color(255,0,0);
repaint();
}
if(jcb3.getSelectedItem()=="藍色"){
color=new Color(0,0,255);
repaint();
}
if(jcb3.getSelectedItem()=="黑色"){
color=new Color(0,0,0);
repaint();
}
if(jcb3.getSelectedItem()=="綠色"){
color=new Color(0,128,0);
repaint();
}
}
});
jbt0.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
Graphics g=jp2.getGraphics();
g.drawLine(10,10,736,10);
}
});
jbt1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
Graphics grap=jp2.getGraphics();//創建所畫組件對象
grap.drawPolygon(xPoint,yPoint,3);
}
});
jbt2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
Graphics gr=jp2.getGraphics();
gr.drawOval(100,10,200,200);
}
});
jbt3.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
Graphics G= jp2.getGraphics();
G.drawRect(500,50,200,200);
}
});
}
public static void main(String[] args){
JFrame frame=new DrawingBoard();
frame.setTitle("測試畫圖板");
frame.setSize(736,379);
frame.setLocation(100,100);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
static class DrawingPanel extends JPanel{
protected void paintComponent(Graphics g){
super.paintComponent(g);
g.setFont(new Font("宋體",Font.BOLD,m));
g.setColor(color);
g.drawString("Heleoeo ",100, 100);
}
}
}
有一些問題還沒有解決，因為重畫，所以字元串可以重畫，別的我沒有重畫，你自己可以修改一下，
還有一個問題，你的菜單條上的功能我暫時不會寫，所以沒有加上去，
希望對你有幫助，一起努力吧！！！
④ 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"); }
}
⑤ JAVA編譯簡易畫圖板代碼
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"); }
}
⑥ java畫板
//有問題的話，給我發網路消息
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;
/**功能介紹
* 1.改變線條長度時滑鼠形狀的改變(滑鼠位於線條兩端時，四種滑鼠狀態)
* 2.移動線條時滑鼠形狀的改變(滑鼠位於線條中間)
* 3.刪除時滑鼠形狀的改變
* 4.最後一條直線顏色的不同
* 5.最大化、最小化、窗口大小改變時，線條的重繪
*
*/
public class LineDraw extends JFrame{
/**
*我需要在一個背景下能在任意位置添加線條，
能通過滑鼠左鍵拉長，並且如果當滑鼠點到直線中央時能拖動線條，當用滑鼠右鍵點擊直線時直線能消失。
*/
private LineDrawPanel drawPanel=new LineDrawPanel();
public static void main(String[] args) {
new LineDraw("畫圖面板");
}
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;//最後一條線，也是當前正在畫的線，注意線的顏色
private boolean isDrawing;//是否正在畫的標記
private Line moveLine;//正在移動的線條
private Line changeLine;//正在改變長度的線條
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("移動");
return;
}
changeLine=getChangeLine(x1, y1);
if(changeLine!=null){
return;
}
setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
setToolTipText("畫圖");
isDrawing=true;
}
}
@Override
public void mouseMoved(MouseEvent e) {
Line l=getChangeLine(e.getX(), e.getY());
if(l!=null){//設置四種滑鼠形狀
setToolTipText("變長");
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("移動");
return;
}
l=getDelLine(e.getX(), e.getY());
if(l!=null){
setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
setToolTipText("右鍵刪除");
}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){//移動
moveLine=null;
repaint();
return;
}
if(changeLine!=null){//改變長度
return;
}
if(isDrawing){//畫線條
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){//滑鼠右鍵
Line delLine=getDelLine(e.getX(), e.getY());//該刪除的線
if(delLine!=null){
list.remove(delLine);
int size=list.size();
lastLine=(size>0?list.get(size-1):null);
repaint();
}
}
}
};
addMouseListener(adapter);//添加滑鼠動作事件
addMouseMotionListener(adapter);//添加滑鼠移動事件
}
public void paint(Graphics g) {
super.paint(g);//調用父類的方法
g.setColor(Color.BLUE);
for (Line l:list) {
l.drawLine(g);
}
g.setColor(Color.red);//畫最後一個線條
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){//獲取能夠改變的直線
for (Line l:list) {
if(l.isCanChange(x,y))
return l;
}
return null;
}
public Line getDelLine(int x,int y){//獲取能夠刪除的直線
for (Line l:list) {
if(l.isCanDel(x,y))
return l;
}
return null;
}
public Line getMoveLine(int x,int y){//獲取能夠移動的直線
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;//決定改變的線條的那一端
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){//線條移動
x1+=xVal;
x2+=xVal;
y1+=yVal;
y2+=yVal;
}
public void changeLength(int xVal,int yVal){//改變長度 (該演算法有點問題)
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(){//判斷所畫的線條是否有效
int len2=(x1-x2)*(x1-x2)+(y1-y2)*(y1-y2);
if(len2==0) return false;
if(Math.sqrt(len2)<=1)//長度小於1的，視為無效線條
return false;
return true;
}
public boolean isCanDel(int x,int y){//線條是否可被刪除
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){//線條是否可改變長度，僅滑鼠位於線條兩端時才可改變
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){//線條是否可移動
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;
}
}
⑦ 基於Java的畫圖板具體要解決什麼
另一個我回答了，加了運行截圖沒有顯示。看看下面代碼，新建類T拷進去，看看是不是你要的。packagetest;importjava.awt.*;importjava.awt.event.*;importjava.util.*;importjavax.swing.*;importjava.awt.geom.*;importjava.io.*;@SuppressWarnings({"serial","unused"}){intx,y;Colorcol;inttool;intboarder;Point(intx,inty,Colorcol,inttool,intboarder){this.x=x;this.y=y;this.col=col;this.tool=tool;this.boarder=boarder;}}@SuppressWarnings({"serial","unused"}),MouseMotionListener,MouseListener,ItemListener{intx=-1,y=-1;intcon=1;//畫筆大小intEcon=5;//橡皮大小inttoolFlag=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）；Colorc=newColor(0,0,0);//畫筆顏色BasicStrokesize=newBasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);//畫筆粗細Pointcutflag=newPoint(-1,-1,c,6,con);//截斷標志@SuppressWarnings("unchecked")VectorpaintInfo=null;//點信息向量組intn=1;FileInputStreampicIn=null;FileOutputStreampicOut=null;ObjectInputStreamVIn=null;ObjectOutputStreamVOut=null;//*工具面板--畫筆，直線，圓，矩形，多邊形,橡皮，清除*/PaneltoolPanel;Buttoneraser,drLine,drCircle,drRect;Buttonclear,pen;ChoiceColChoice,SizeChoice,EraserChoice;Buttoncolchooser;Label顏色,大小B,大小E;//保存功能//ButtonopenPic,savePic;FileDialogopenPicture,savePicture;@SuppressWarnings("unchecked")paintboard(Strings){super(s);addMouseMotionListener(this);addMouseListener(this);paintInfo=newVector();/*各工具按鈕及選擇項*///顏色選擇ColChoice=newChoice();ColChoice.add("black");ColChoice.add("red");ColChoice.add("blue");ColChoice.add("green");ColChoice.addItemListener(this);//畫筆大小選擇SizeChoice=newChoice();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=newChoice();EraserChoice.add("5");EraserChoice.add("9");EraserChoice.add("13");EraserChoice.add("17");EraserChoice.addItemListener(this);////////////////////////////////////////////////////toolPanel=newPanel();clear=newButton("清除");eraser=newButton("橡皮");pen=newButton("畫筆");drLine=newButton("畫直線");drCircle=newButton("畫圓形");drRect=newButton("畫矩形");colchooser=newButton("顯示調色板");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);//各組件事件監聽clear.addActionListener(this);eraser.addActionListener(this);pen.addActionListener(this);drLine.addActionListener(this);drCircle.addActionListener(this);drRect.addActionListener(this);colchooser.addActionListener(this);顏色=newLabel("畫筆顏色",Label.CENTER);大小B=newLabel("畫筆大小",Label.CENTER);大小E=newLabel("橡皮大小",Label.CENTER);顏色.setBackground(Color.gray);大小B.setBackground(Color.gray);大小E.setBackground(Color.gray);//面板添加組件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();//=newFileDialog(this,"打開圖畫",FileDialog.LOAD);openPicture.setVisible(false);savePicture=newFileDialog(this,"保存圖畫",FileDialog.SAVE);savePicture.setVisible(false);openPicture.addWindowListener(newWindowAdapter(){publicvoidwindowClosing(WindowEvente){openPicture.setVisible(false);}});savePicture.addWindowListener(newWindowAdapter(){publicvoidwindowClosing(WindowEvente){savePicture.setVisible(false);}});addWindowListener(newWindowAdapter(){publicvoidwindowClosing(WindowEvente){System.exit(0);}});}publicvoidpaint(Graphicsg){Graphics2Dg2d=(Graphics2D)g;Pointp1,p2;n=paintInfo.size();if(toolFlag==2)g.clearRect(0,0,getSize().width,getSize().height);//清除for(inti=1;i
⑧ 求java版畫圖程序的源代碼
找到了，很久以前寫的一個簡單畫圖，呵呵～當時要求用AWT寫，很難受。
package net.miqiang.gui;
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Label;
import java.awt.Panel;
import java.awt.RenderingHints;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
/**
* 簡單畫圖板程序
* 好久沒用 AWT 了，寫起來真別扭，如果用 swing 會很舒服，有空再改寫吧。
*
* @author 米強
*
*/
public class TestMain extends Frame {
// 畫板
private Palette palette = null;
// 顯示當前顏色的面板
private Panel nonceColor = null;
// 畫筆粗細
private Label drawWidth = null;
// 畫筆端點的裝飾
private Label drawCap = null;
// 選取顏色按鈕的監聽事件類
private ButtonColorAction buttonColorAction = null;
// 滑鼠進入按鈕後游標樣式的監聽事件類
private ButtonCursor buttonCursor = null;
// 畫筆樣式的監聽事件
private ButtonStrokeAction buttonStrokeAction = null;
/**
* 構造方法
*
*/
public TestMain() {
// 設置標題欄文字
super("簡易畫圖板");
// 構造一個畫圖板
palette = new Palette();
Panel pane = new Panel(new GridLayout(2, 1));
// 畫筆顏色選擇器
Panel paneColor = new Panel(new GridLayout(1, 13));
// 12 個顏色選擇按鈕
Button [] buttonColor = new Button[12];
Color [] color = {Color.black, Color.blue, Color.cyan, Color.darkGray, Color.gray, Color.green, Color.magenta, Color.orange, Color.pink, Color.red, Color.white, Color.yellow};
// 顯示當前顏色的面板
nonceColor = new Panel();
nonceColor.setBackground(Color.black);
paneColor.add(nonceColor);
buttonColorAction = new ButtonColorAction();
buttonCursor = new ButtonCursor();
for(int i = 0; i < buttonColor.length; i++){
buttonColor[i] = new Button();
buttonColor[i].setBackground(color[i]);
buttonColor[i].addActionListener(buttonColorAction);
buttonColor[i].addMouseListener(buttonCursor);
paneColor.add(buttonColor[i]);
}
pane.add(paneColor);
// 畫筆顏色選擇器
Panel paneStroke = new Panel(new GridLayout(1, 13));
// 控制畫筆樣式
buttonStrokeAction = new ButtonStrokeAction();
Button [] buttonStroke = new Button[11];
buttonStroke[0] = new Button("1");
buttonStroke[1] = new Button("3");
buttonStroke[2] = new Button("5");
buttonStroke[3] = new Button("7");
buttonStroke[4] = new Button("9");
buttonStroke[5] = new Button("11");
buttonStroke[6] = new Button("13");
buttonStroke[7] = new Button("15");
buttonStroke[8] = new Button("17");
buttonStroke[9] = new Button("■");
buttonStroke[10] = new Button("●");
drawWidth = new Label("3", Label.CENTER);
drawCap = new Label("●", Label.CENTER);
drawWidth.setBackground(Color.lightGray);
drawCap.setBackground(Color.lightGray);
paneStroke.add(drawWidth);
for(int i = 0; i < buttonStroke.length; i++){
paneStroke.add(buttonStroke[i]);
buttonStroke[i].addMouseListener(buttonCursor);
buttonStroke[i].addActionListener(buttonStrokeAction);
if(i <= 8){
buttonStroke[i].setName("width");
}else{
buttonStroke[i].setName("cap");
}
if(i == 8){
paneStroke.add(drawCap);
}
}
pane.add(paneStroke);
// 將畫筆顏色選擇器添加到窗體中
this.add(pane, BorderLayout.NORTH);
// 將畫圖板添加到窗體中
this.add(palette);
// 添加窗口監聽，點擊關閉按鈕時退出程序
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
// 設置窗體 ICON 圖標
this.setIconImage(Toolkit.getDefaultToolkit().createImage("images/palette.png"));
// 設置窗口的大小
this.setSize(new Dimension(400, 430));
// 設置窗口位置，處於屏幕正中央
this.setLocationRelativeTo(null);
// 顯示窗口
this.setVisible(true);
}
/**
* 程序入口
*
* @param args
* 字元串數組參數
*/
public static void main(String[] args) {
new TestMain();
}
/**
* 選取顏色按鈕的監聽事件類
* @author 米強
*
*/
class ButtonColorAction implements ActionListener {
public void actionPerformed(ActionEvent e) {
Color color_temp = ((Button)e.getSource()).getBackground();
nonceColor.setBackground(color_temp);
palette.setColor(color_temp);
}
}
/**
* 滑鼠進入按鈕變換游標樣式監聽事件類
* @author 米強
*
*/
class ButtonCursor extends MouseAdapter {
public void mouseEntered(MouseEvent e) {
((Button)e.getSource()).setCursor(new Cursor(Cursor.HAND_CURSOR));
}
public void mouseExited(MouseEvent e) {
((Button)e.getSource()).setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
}
}
/**
* 設置畫筆的監聽事件類
* @author 米強
*
*/
class ButtonStrokeAction implements ActionListener {
public void actionPerformed(ActionEvent e) {
Button button_temp = (Button) e.getSource();
String name = button_temp.getName();
if(name.equalsIgnoreCase("width")){
drawWidth.setText(button_temp.getLabel());
palette.setStroke(Float.parseFloat(button_temp.getLabel()));
}else if(name.equalsIgnoreCase("cap")){
drawCap.setText(button_temp.getLabel());
if(button_temp.getLabel().equals("■")){
palette.setStroke(BasicStroke.CAP_SQUARE);
}else if(button_temp.getLabel().equals("●")){
palette.setStroke(BasicStroke.CAP_ROUND);
}
}
}
}
}
/**
* 畫板類
*
* @author 米強
*
*/
class Palette extends Panel implements MouseListener, MouseMotionListener {
// 滑鼠 X 坐標的位置
private int mouseX = 0;
// 上一次 X 坐標位置
private int oldMouseX = 0;
// 滑鼠 Y 坐標的位置
private int mouseY = 0;
// 上一次 Y 坐標位置
private int oldMouseY = 0;
// 畫圖顏色
private Color color = null;
// 畫筆樣式
private BasicStroke stroke = null;
// 緩存圖形
private BufferedImage image = null;
/**
* 構造一個畫板類
*
*/
public Palette() {
this.addMouseListener(this);
this.addMouseMotionListener(this);
// 默認黑色畫筆
color = new Color(0, 0, 0);
// 設置默認畫筆樣式
stroke = new BasicStroke(3.0f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
// 建立 1280 * 1024 的 RGB 緩存圖象
image = new BufferedImage(1280, 1024, BufferedImage.TYPE_INT_RGB);
// 設置顏色
image.getGraphics().setColor(Color.white);
// 畫背景
image.getGraphics().fillRect(0, 0, 1280, 1024);
}
/**
* 重寫 paint 繪圖方法
*/
public void paint(Graphics g) {
super.paint(g);
// 轉換為 Graphics2D
Graphics2D g2d = (Graphics2D) g;
// 獲取緩存圖形 Graphics2D
Graphics2D bg = image.createGraphics();
// 圖形抗鋸齒
bg.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
// 設置繪圖顏色
bg.setColor(color);
// 設置畫筆樣式
bg.setStroke(stroke);
// 畫線，從上一個點到新的點
bg.drawLine(oldMouseX, oldMouseY, mouseX, mouseY);
// 將緩存中的圖形畫到畫板上
g2d.drawImage(image, 0, 0, this);
}
/**
* 重寫 update 方法
*/
public void update(Graphics g) {
this.paint(g);
}
/**
* @return stroke
*/
public BasicStroke getStroke() {
return stroke;
}
/**
* @param stroke 要設置的 stroke
*/
public void setStroke(BasicStroke stroke) {
this.stroke = stroke;
}
/**
* 設置畫筆粗細
* @param width
*/
public void setStroke(float width) {
this.stroke = new BasicStroke(width, stroke.getEndCap(), stroke.getLineJoin());
}
/**
* 設置畫筆端點的裝飾
* @param cap 參考 java.awt.BasicStroke 類靜態欄位
*/
public void setStroke(int cap) {
this.stroke = new BasicStroke(stroke.getLineWidth(), cap, stroke.getLineJoin());
}
/**
* @return color
*/
public Color getColor() {
return color;
}
/**
* @param color 要設置的 color
*/
public void setColor(Color color) {
this.color = color;
}
public void mouseClicked(MouseEvent mouseEvent) {
}
/**
* 滑鼠按下
*/
public void mousePressed(MouseEvent mouseEvent) {
this.oldMouseX = this.mouseX = mouseEvent.getX();
this.oldMouseY = this.mouseY = mouseEvent.getY();
repaint();
}
public void mouseReleased(MouseEvent mouseEvent) {
}
/**
* 滑鼠進入棋盤
*/
public void mouseEntered(MouseEvent mouseEvent) {
this.setCursor(new Cursor(Cursor.CROSSHAIR_CURSOR));
}
/**
* 滑鼠退出棋盤
*/
public void mouseExited(MouseEvent mouseEvent) {
this.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
}
/**
* 滑鼠拖動
*/
public void mouseDragged(MouseEvent mouseEvent) {
this.oldMouseX = this.mouseX;
this.oldMouseY = this.mouseY;
this.mouseX = mouseEvent.getX();
this.mouseY = mouseEvent.getY();
repaint();
}
public void mouseMoved(MouseEvent mouseEvent) {
}
}