Question

用Java如何判断坐标点

Answer 1

//提示：坐标依次打印在命令符窗口
//提示：坐标依次打印在命令符窗口
//提示：坐标依次打印在命令符窗口
//不就是监听鼠标事件吗？
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.border.Border;
/**
*我想建立个界面，可以加载本机中图片。
*加载后可以通过鼠标点击获得图片上任意点坐标。
*/
public class MyPicture extends JFrame implements MouseListener{
private JLabel tipLabel;/**
*main()
*/
public static void main(String[] args){
MyPicture frame = new MyPicture();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
/**
*constructor
*/
public MyPicture(){
setSize(800, 600);//根据要求调整大小
setLocation(100,100);
setTitle("获得图片上任意点坐标");
setResizable(false);Container con=getContentPane();ImageIcon bgIcon=new ImageIcon("bgpic.jpg");//注意图片的路径
ImagePanel backpicPanel=new ImagePanel(bgIcon);
backpicPanel.addMouseListener(this);
con.add(backpicPanel,BorderLayout.CENTER);tipLabel=new JLabel("--------------------提示：坐标依次打印在屏幕上!--------------------");
con.add(tipLabel,BorderLayout.SOUTH);
}
/**
*
*/
public void mousePressed(MouseEvent e){
int x=e.getX();
int y=e.getY();
String message="("+x+","+y+")";
tipLabel.setText(message);
System.out.println(message);}public void mouseReleased(MouseEvent e){}public void mouseEntered(MouseEvent e){}public void mouseExited(MouseEvent e){}public void mouseClicked(MouseEvent e){}}/**
*类ImagePanel，用于添加背景图片
*/
class ImagePanel extends JPanel{
private Image img;
public ImagePanel (ImageIcon imageIcon){
img=imageIcon.getImage();
}public void paintComponent(Graphics g){
super.paintComponent(g);
g.drawImage(img,0,0,this);
}}

Answer 2

给你举个例子。int x=3,y=4;Point p1=new Point(x,y); //将原点p1定在（3，4）坐标点Point p2=new Point(6,8) //将原点p2定在（6，8）坐标点

Answer 3

给段代码一参考参考吧
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public class Mouse extends JFrame implements MouseListener {
JPanel jp = new JPanel();
JLabel statusbar = new JLabel();
static final long serialVersionUID = 0;

public Mouse() {
setTitle("Mouse Event");
getContentPane().add(jp, BorderLayout.CENTER);
getContentPane().add(statusbar, BorderLayout.SOUTH);
jp.addMouseListener(this);
}

public static void main(String[] args) {
Mouse frame = new Mouse();
frame.setSize(500, 500);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

public void mousePressed(MouseEvent e) {
int x = e.getX();
int y = e.getY();
String s = "鼠标在坐标" + "(" + x + "," + y + ")" + "处按下";
statusbar.setText(s);
}

public void mouseClicked(MouseEvent e) {
}

public void mouseEntered(MouseEvent e) {

}

public void mouseExited(MouseEvent e) {
// TODO Auto-generated method stub

}

public void mouseReleased(MouseEvent e) {
// TODO Auto-generated method stub

}
}