兄弟帮下忙！感激不尽！JAVA2D绘图中怎么实现画的图象被选中?还有实现图象的移动?
JAVA2D绘图中怎么实现画的图象被选中?还有实现图象的移动?这个问题搞到我好痛苦！日思夜想！
[解决办法]
找了一个java的画图程序，希望有帮助；
/*
* 画图程序 来自bc-cn论坛
* java applet 与windows自带的程序类似，功能简单
*
*
*/
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.util.Iterator;
import java.util.LinkedList;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JColorChooser;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Test extends JPanel implements Runnable,ActionListener,MouseListener,MouseMotionListener {
private JButton clear,draw,replay,btnColor;//清除,开始画和重放和颜色的按钮
Color choosedColor = Color.BLACK;//选中的颜色
JDialog dialog = null;
private LinkedList <MyShape> save;//保存起来的形状
private int flag=0;//定义一个标志,用它来传递当前是在干什么
private final int DRAW=1;//1代表当前正在画图
private final int REPLAY=2;//2代表当前正在重放
private LinkedList <Pen> ps;//保存点
private volatile boolean go;
/** Creates a new instance of Test */
public Test() {
initOther();
initWindow();
}
private void initOther(){
clear=new JButton( "清除 ");
draw=new JButton( "开始画 ");
replay=new JButton( "重放 ");
btnColor = new JButton( "选取颜色 ");//选颜色
clear.addActionListener(this);
draw.addActionListener(this);
replay.addActionListener(this);
save=new LinkedList <MyShape> ();
ps=new LinkedList <Pen> ();
clear.setEnabled(false);
replay.setEnabled(false);
}
private void initWindow(){
JFrame jf=new JFrame( "画板 Dream ");
JPanel down=new JPanel();
down.add(clear);
down.add(draw);
down.add(replay);
down.add(btnColor);
this.setBorder(BorderFactory.createTitledBorder( "绘画区 "));
jf.add(this,BorderLayout.CENTER);
jf.add(down,BorderLayout.SOUTH);
jf.setSize(500,450);
jf.setLocationRelativeTo(null);
jf.setVisible(true);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
btnColor.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
final JColorChooser chooser = new JColorChooser();
dialog = JColorChooser.createDialog(null, "选取颜色 ", false, chooser, new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
choosedColor = chooser.getColor();
}
}, null);
dialog.setVisible(true);
}
});
}
protected void paintComponent(Graphics g){
super.paintComponent(g);
if(flag==DRAW){
for(MyShape my:save){
my.drawMe(g);
}
Point previous=null;
for(Pen pp:ps){
Point p = pp.getP();
if(previous!=null)
{
Graphics2D g2 = (Graphics2D)g;
g2.setStroke(new BasicStroke(2,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL,2));
g.setColor(pp.getColor());
g.drawLine(previous.x,previous.y,p.x,p.y);
}
previous=p;
}
}else if(flag==REPLAY){
try{
for(MyShape my:save){
if(my.hasNext()){
my.drawNext(g);
return;
}else{
my.drawMe(g);
}
}
for(MyShape my:save)
{
my.reset();
}
go=false;
replay.setEnabled(true);
draw.setEnabled(true);
} catch(Exception exe){
exe.printStackTrace();
}
}
}
public void run(){
while(go){
try{
Thread.sleep(20);
repaint();
} catch(Exception exe){
exe.printStackTrace();
}
}
flag=DRAW;
repaint();
}
public void actionPerformed(ActionEvent e) {
Object source=e.getSource();
if(source==clear){
save.clear();
replay.setEnabled(false);
repaint();
}else if(source==draw){
flag=DRAW;
this.addMouseListener(this);
this.addMouseMotionListener(this);
draw.setEnabled(false);
clear.setEnabled(true);
}else if(source==replay){
flag=REPLAY;
this.removeMouseListener(this);
this.removeMouseMotionListener(this);
replay.setEnabled(false);
draw.setEnabled(false);
clear.setEnabled(false);
go=true;
new Thread(this).start();
}
}
public void mouseClicked(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
Point p=e.getPoint();
Pen pp = new Pen(p,choosedColor);
replay.setEnabled(false);
ps.offer(pp);
repaint();
}
public void mouseReleased(MouseEvent e) {
replay.setEnabled(true);
Pen pp = new Pen(e.getPoint(),choosedColor);
save.add(new MyLine(ps));
ps=new LinkedList <Pen> ();
repaint();
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
public void mouseDragged(MouseEvent e) {
Pen pp = new Pen(e.getPoint(),choosedColor);
ps.offer(pp);
repaint();
}
public void mouseMoved(MouseEvent e) {
}
public static void main(String[] args) {
new Test();
}
}
[解决办法]
for(MyShape my:save){
my.drawMe(g);
}
for增强版与for-each相同功能，上面代码可以改为：
for(int i=0;i <save.size();i++){
MyShape my = save.get(i);
my.drawMe(g);
}
[解决办法]
LinkedList <MyShape> ：泛型（也有叫模板的），需要1.5或以上的JDK支持
[解决办法]
把 <MyShape> 去掉，但是後面很多地方都要進行“拆箱”，foreach也不可以再用了，比較麻煩。
還是升級JDK吧，可以多學不少東西的。
