我要制作的地图遇到了麻烦。我要做的是在我的校园中建筑物的地板上绘制网格图。整个地板是一个正方形，在走廊上附加了不同的房间。我正在为房间里的人制作地图。现在，我“硬编码”的是我想用它来表示有人在其中的正方形（JPanel）的坐标。我使用JPanel [] []网格将正方形存储为行和列。我想知道的是如何检测鼠标单击某个JPanel对象而不是仅检测框架的x和y坐标。
此外，据我所知，我知道我的代码肯定可以使用改进，因此，如果有更好的方法可以执行此操作，请随时告诉我。
谢谢。
import javax.swing.*;
import java.util.*;
import java.util.List;
import java.awt.*;
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;
public class Example extends JPanel {
enum Token {VIDE, CERCLE_BLEU, CERCLE_ROUGE}
private static final int ICON_W = 35;
private JPanel[][] grid;
Example(int rows, int cols) {
setLayout(new GridLayout(rows, cols, 1, 1));
setBorder(BorderFactory.createLineBorder(Color.red));
setBackground(Color.BLACK);
createGrid(rows, cols);
Click click = new Click();
this.addMouseListener(click);
}
void createGrid(int rows, int cols) {
boolean personTrapped = false;
grid = new JPanel[rows][cols];
for (int r = 0; r < grid.length; r++) {
for (int c = 0; c < grid[r].length; c++) {
grid[r][c] = new JPanel();
grid[r][c].setOpaque(true);
grid[r][c].setBackground(Color.WHITE);
grid[r][c].setPreferredSize(new Dimension(ICON_W, ICON_W));
add(grid[r][c]);
}
}
/*
* Path for floor in building
*/
grid[1][1].setBackground(Color.DARK_GRAY);
grid[1][2].setBackground(Color.DARK_GRAY);
grid[1][3].setBackground(Color.DARK_GRAY);
grid[1][4].setBackground(Color.DARK_GRAY);
grid[1][5].setBackground(Color.DARK_GRAY);
grid[1][6].setBackground(Color.DARK_GRAY);
grid[1][7].setBackground(Color.DARK_GRAY);
grid[1][8].setBackground(Color.DARK_GRAY);
grid[2][1].setBackground(Color.DARK_GRAY);
grid[3][1].setBackground(Color.DARK_GRAY);
grid[4][1].setBackground(Color.DARK_GRAY);
grid[5][1].setBackground(Color.DARK_GRAY);
grid[6][1].setBackground(Color.DARK_GRAY);
grid[7][1].setBackground(Color.DARK_GRAY);
grid[8][1].setBackground(Color.DARK_GRAY);
grid[2][8].setBackground(Color.DARK_GRAY);
grid[3][8].setBackground(Color.DARK_GRAY);
grid[4][8].setBackground(Color.DARK_GRAY);
grid[5][8].setBackground(Color.DARK_GRAY);
grid[6][8].setBackground(Color.DARK_GRAY);
grid[7][8].setBackground(Color.DARK_GRAY);
grid[8][8].setBackground(Color.DARK_GRAY);
grid[8][1].setBackground(Color.DARK_GRAY);
grid[8][2].setBackground(Color.DARK_GRAY);
grid[8][3].setBackground(Color.DARK_GRAY);
grid[8][4].setBackground(Color.DARK_GRAY);
grid[8][5].setBackground(Color.DARK_GRAY);
grid[8][6].setBackground(Color.DARK_GRAY);
grid[8][7].setBackground(Color.DARK_GRAY);
// Rooms in building
grid[0][3].setBackground(Color.DARK_GRAY);
grid[2][4].setBackground(Color.DARK_GRAY);
grid[0][6].setBackground(Color.DARK_GRAY);
grid[3][9].setBackground(Color.DARK_GRAY);
grid[5][7].setBackground(Color.DARK_GRAY);
grid[7][9].setBackground(Color.DARK_GRAY);
grid[9][7].setBackground(Color.DARK_GRAY);
grid[7][5].setBackground(Color.DARK_GRAY);
grid[9][3].setBackground(Color.DARK_GRAY);
grid[7][0].setBackground(Color.DARK_GRAY);
grid[5][2].setBackground(Color.DARK_GRAY);
grid[3][0].setBackground(Color.DARK_GRAY);
}
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
@Override
public void run()
{
JFrame frame = new JFrame("RIC Emergency Map");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Example example = new Example(15, 10);
frame.add(example);
frame.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent we)
{
int result = JOptionPane.showConfirmDialog(frame, "Do you want to Exit ?", "Exit Confirmation : ",JOptionPane.YES_NO_OPTION);
if (result == JOptionPane.YES_OPTION)
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
else if (result == JOptionPane.NO_OPTION)
frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
}
});
frame.getGlassPane().setVisible(true);
frame.setLocationRelativeTo(null);
frame.pack();
//frame.setSize(500, 500);
frame.setResizable(true);
frame.setVisible(true);
}
});
}
}
class Move implements MouseMotionListener
{
@Override
public void mouseDragged(MouseEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public void mouseMoved(MouseEvent e) {
// TODO Auto-generated method stub
}
}
class Click implements MouseListener
{
@Override
public void mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub
System.out.println(e.getPoint());
if (e.getX() >= 150 && e.getX() <= 185 && e.getY() >= 73 && e.getY() <= 108)
{
System.out.println("There is somebody in this room!!!");
}
else
{
System.out.println("Oh no, there isn't anyone in this room. Hurry! Keep looking!");
}
}
@Override
public void mouseEntered(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseExited(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mousePressed(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseReleased(MouseEvent e) {
// TODO Auto-generated method stub
}
}
答案 0 :(得分：2)
只需创建一个MouseListener（或更好的MouseAdapter），然后在创建网格时将其添加到JPanel网格中的每个JPanel单元中。
例如，如果您有一个名为MyMouse的MouseAdapter：
grid = new JPanel[rows][cols];
MyMouse myMouse = new MyMouse();
for (int r = 0; r < grid.length; r++) {
for (int c = 0; c < grid[r].length; c++) {
grid[r][c] = new JPanel();
grid[r][c].setOpaque(true);
Color color = data[r][c] == 0 ? Color.WHITE : Color.DARK_GRAY;
grid[r][c].setBackground(color);
grid[r][c].setPreferredSize(new Dimension(ICON_W, ICON_W));
grid[r][c].addMouseListener(myMouse); // ***** here, add the listener)
add(grid[r][c]);
}
}
会工作：
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.*;
@SuppressWarnings("serial")
public class Example2 extends JPanel {
// enum Token {
// VIDE, CERCLE_BLEU, CERCLE_ROUGE
// }
private static final int ICON_W = 35;
private JPanel[][] grid;
public Example2(int[][] data) {
int rows = data.length;
int cols = data[0].length;
setLayout(new GridLayout(rows, cols, 1, 1));
setBorder(BorderFactory.createLineBorder(Color.red));
setBackground(Color.BLACK);
createGrid(data);
}
private void createGrid(int[][] data) {
int rows = data.length;
int cols = data[0].length;
grid = new JPanel[rows][cols];
MyMouse myMouse = new MyMouse();
for (int r = 0; r < grid.length; r++) {
for (int c = 0; c < grid[r].length; c++) {
grid[r][c] = new JPanel();
grid[r][c].setOpaque(true);
Color color = data[r][c] == 0 ? Color.WHITE : Color.DARK_GRAY;
grid[r][c].setBackground(color);
grid[r][c].setPreferredSize(new Dimension(ICON_W, ICON_W));
grid[r][c].addMouseListener(myMouse);
add(grid[r][c]);
}
}
}
private class MyMouse extends MouseAdapter {
@Override
public void mousePressed(MouseEvent e) {
JPanel source = (JPanel) e.getSource();
int r = -1;
int c = -1;
for (int row = 0; row < grid.length; row++) {
for (int col = 0; col < grid[row].length; col++) {
if (grid[row][col] == source) {
r = row;
c = col;
break;
}
}
}
Color color = source.getBackground();
System.out.printf("Cell: [%d, %d] color white: %b%n", c, r, color.equals(Color.WHITE));
}
}
private static void createAndShowGui() {
int[][] data = {
{0, 0, 0, 1, 0, 0, 1, 0, 0, 0},
{0, 1, 1, 1, 1, 1, 1, 1, 1, 0},
{0, 1, 0, 0, 1, 0, 0, 0, 1, 0},
{1, 1, 0, 0, 0, 0, 0, 0, 1, 1},
{0, 1, 0, 0, 0, 0, 0, 0, 1, 0},
{0, 1, 1, 0, 0, 0, 0, 1, 1, 0},
{0, 1, 0, 0, 0, 0, 0, 0, 1, 0},
{1, 1, 0, 0, 0, 1, 0, 0, 1, 1},
{0, 1, 1, 1, 1, 1, 1, 1, 1, 0},
{0, 0, 0, 1, 0, 0, 1, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
};
Example2 mainPanel = new Example2(data);
JFrame frame = new JFrame("RIC Emergency Map");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> createAndShowGui());
}
}
在此示例中，我通过MouseEvent的.getSource()方法获得了JPanel单元。然后，我遍历网格以查找单元格的坐标。我还可以提取其背景颜色，看看它是否为白色。
private class MyMouse extends MouseAdapter {
@Override
public void mousePressed(MouseEvent e) {
JPanel source = (JPanel) e.getSource();
// initially set row and column to -1
int r = -1;
int c = -1;
// iterate through the grid finding out which cell is source
for (int row = 0; row < grid.length; row++) {
for (int col = 0; col < grid[row].length; col++) {
if (grid[row][col] == source) {
r = row;
c = col;
break;
}
}
}
Color color = source.getBackground();
System.out.printf("Cell: [%d, %d] color white: %b%n", c, r, color.equals(Color.WHITE));
}
}