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在鼠标上添加图像单击JPanel

更新时间：2023-12-05 11:50:04

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  1. 发布 SSCCE 可短时间运行，可编辑


  2. 为什么有 yPos = event.getY（） - 25; 什么是逻辑代表整数在-25


  3. 在局部变量中存储所有 ImageIcons ImageIcons 在任何数组中或 List 在有固定逻辑而不是坐标，然后加载 image = new ImageIcon（getClass（）。getResource（）绘制在 paintComponent 中，不要提供任何 FileIO 在运行时







  • 创建由 GridLayout 放置的 JLabel 的网格，添加 MouseListener 到 JLabel s，从更改 JLabel.setIcon（myImageIcon）莫



例如

使用事件，其他逻辑我缺少SSCCE b
$ b 
  import java.awt.BorderLayout; 
 import java.awt.Component; 
 import java.awt.GridLayout; 
 import java.awt.event.ActionEvent; 
 import java.awt.event.ActionListener; 
 import java.awt.event.MouseAdapter; 
 import java.awt.event.MouseEvent; 
 import javax.swing.Icon; 
 import javax.swing.JButton; 
 import javax.swing.JFrame; 
 import javax.swing.JLabel; 
 import javax.swing.JPanel; 
 import javax.swing.UIManager; 

 public class ChessBoard extends JFrame {

 private JFrame frame = new JFrame（）; 
 private JPanel panel = new JPanel（）; 
 private图标errorIcon = UIManager.getIcon（OptionPane.errorIcon）; 
私有图标infoIcon = UIManager.getIcon（OptionPane.informationIcon）; 
 private图标warnIcon = UIManager.getIcon（OptionPane.warningIcon）; 
 private图标questnIcon = UIManager.getIcon（OptionPane.questionIcon）; 
私人JButton按钮=新JButton（重置我的棋盘）; 

 public ChessBoard（）{
 panel.setLayout（new GridLayout（8，8，0，0））; 
 for（int i = 0; i  final JLabel label = new JLabel（）; 
 label.setIcon（errorIcon）; 
 label.addMouseListener（new MouseAdapter（）{
 @Override 
 public void mouseClicked（MouseEvent e）{
 if（e.getButton（）== MouseEvent.BUTTON3）{
 label.setIcon（infoIcon）; 
} else {
 label.setIcon（warnIcon）; 
} 
} 

 @Override 
 public void mouseEntered（MouseEvent me）{
 label.setIcon（questnIcon）; 
} 
}）; 
 panel.add（label）; 
} 
 button.addActionListener（new ActionListener（）{
 @Override 
 public void actionPerformed（ActionEvent e）{
 for（Component c：panel.getComponents（） ）{
 if（c instance of JLabel）{
 JLabel label =（JLabel）c; 
 label.setIcon（errorIcon）; 
} 
} 
 } 
}）; 
 frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）; 
 frame.add（panel）; 
 frame.add（button，BorderLayout.SOUTH）; 
 frame.pack（）; 
 frame.setVisible（true）; 


 public static void main（String [] args）{
 java.awt.EventQueue.invokeLater（new Runnable（）{
 @Override 
 public void run（）{
 new ChessBoard（）; 
} 
}）; 
} 
}


I am working with Swing for the first time and am having a bit of an issue. What I have is a JFrame split into four JPanels. There is a MouseListener on the JFrame that acts like this

On a click, if the click is inside of the left hand bar, determine which of the 13 icons is being selected. If the click is inside the right hand "game pane" & an icon has been selected, place it at the location clicked.

This is done here

@Override
public void mouseClicked(MouseEvent event) {
    // TODO Auto-generated method stub
    xPos = event.getX();
    yPos = event.getY()-25;
    //If click is inside tool bar
    if(xPos<=75){
        if(yPos>-1 && yPos<48)
            //First tool image
              image = new ImageIcon(getClass().getResource(_image path_)).getImage();
        else if(yPos>=48 && yPos<96)
            //Second tool image
              image = new ImageIcon(getClass().getResource(_image path_)).getImage();
        else if(yPos>=96 && yPos<144)
            //Third tool image
              image = new ImageIcon(getClass().getResource(_image path_)).getImage();
        else if(yPos>=144 && yPos<192)
            //Fourth tool image
              image = new ImageIcon(getClass().getResource(imagepath)).getImage();
        else if(yPos>=192 && yPos<240)
            //Fifth tool image
              image = new ImageIcon(getClass().getResource(imagepath)).getImage();
        else if(yPos>=240 && yPos<288)
            //Sixth tool image
              image = new ImageIcon(getClass().getResource(imagepath)).getImage();
        else if(yPos>=288 && yPos<336)
            //Seventh tool image
              image = new ImageIcon(getClass().getResource(imagepath)).getImage();
        else if(yPos>=336 && yPos<384)
            //First NPC image
              image = new ImageIcon(getClass().getResource(imagepath)).getImage();
        else if(yPos>=384 && yPos<432)
            //second NPC image
              image = new ImageIcon(getClass().getResource(imagepath)).getImage();
        else if(yPos>=432 && yPos<480)
            //Third NPC image
              image = new ImageIcon(getClass().getResource(imagepath)).getImage();
        else if(yPos>=480 && yPos<528)
            //First Decoration image
              image = new ImageIcon(getClass().getResource(imagepath)).getImage();
        else if(yPos>=528 && yPos<576)
            //Second Decoration image
              image = new ImageIcon(getClass().getResource(imagepath)).getImage();
        else if(yPos>=576 && yPos<=625)
            //Third Decoration image
              image = new ImageIcon(getClass().getResource(imagepath)).getImage();
    }
    //If click is within Game Pane
    else if (xPos>75 && yPos<625){
        //A tool has been selected
        if(image!=null){
            placedTool = this.image;
            this.image = null;
            placeable = true;
        }
    }
    //An image and location on the game pane has been selected
    if(placeable && this.image==null){
        ImageInfo newImg = new ImageInfo(xPos, yPos, image);
        gamePane.additions.add(newImg);
        gamePane.repaint();
        System.out.println("IMAGE PLACED @ " + xPos + ", " + yPos);
        placeable = false;
    }

    System.out.println("CLICK: (" + xPos + "," + yPos +")");
}

Where imagepath is the path of a 50x50 icon. This portion works correctly with no errors. However gamePane doesn't get repainted properly.

gamePane simply has a background image for now. As components are added, they're supposed to be painted on top. All that gets painted is the background image though. Is there any way to specify the Z component using Graphics.drawImage(); Here's what I have for the paintComponent function of gamePane (bolded because this is the main issue)

@Override
protected void paintComponent(Graphics g) {
    g.drawImage(backgroundImg, 0, 0, null);
    for(ImageInfo add : additions){
        g.drawImage(add.getImage(), add.getX(), add.getY(), null);
    }
}

Where additions is defined like this

List additions = new ArrayList();

And the ImageInfo class just contains an image, an x coordinate, and a y coordinate

public class ImageInfo {
private int x;
private int y;
private Image image;

public int getX() {
    return x;
}

public int getY() {
    return y;
}

public Image getImage() {
    return image;
}

public ImageInfo(int x, int y, Image image) {
    super();
    this.x = x;
    this.y = y;
    this.image = image;
}

}

FIXED:

Thank you mKorbel. By defining all the images outside of the mouseClicked method

Image tool1 = new ImageIcon(getClass().getResource(toolBar.TOOL1)).getImage();
Image tool2 = new ImageIcon(getClass().getResource(toolBar.TOOL2)).getImage();
Image tool3 = new ImageIcon(getClass().getResource(toolBar.TOOL3)).getImage();
Image tool4 = new ImageIcon(getClass().getResource(toolBar.TOOL4)).getImage();
Image tool5 = new ImageIcon(getClass().getResource(toolBar.TOOL5)).getImage();
Image tool6 = new ImageIcon(getClass().getResource(toolBar.TOOL6)).getImage();
Image tool7 = new ImageIcon(getClass().getResource(toolBar.TOOL7)).getImage();
Image npc1 = new ImageIcon(getClass().getResource(toolBar.NPC1)).getImage();
Image npc2 = new ImageIcon(getClass().getResource(toolBar.NPC2)).getImage();
Image npc3 = new ImageIcon(getClass().getResource(toolBar.NPC3)).getImage();
Image decor1 = new ImageIcon(getClass().getResource(toolBar.DECOR1)).getImage();
Image decor2 = new ImageIcon(getClass().getResource(toolBar.DECOR2)).getImage();
Image decor3 = new ImageIcon(getClass().getResource(toolBar.DECOR3)).getImage();

and the executing the mouseClicked function like

@Override
public void mouseClicked(MouseEvent event) {
    // TODO Auto-generated method stub
    xPos = event.getX();
    yPos = event.getY()-25;
    //If click is inside tool bar
    if(xPos<=75){
        if(yPos>-1 && yPos<48)
            //First tool image
              image = tool1;
        else if(yPos>=48 && yPos<96)
            //Second tool image
              image = tool2;
        else if(yPos>=96 && yPos<144)
            //Third tool image
              image = tool3;
        else if(yPos>=144 && yPos<192)
            //Fourth tool image
              image = tool4;
        else if(yPos>=192 && yPos<240)
            //Fifth tool image
              image = tool5;
        else if(yPos>=240 && yPos<288)
            //Sixth tool image
              image = tool6;
        else if(yPos>=288 && yPos<336)
            //Seventh tool image
              image = tool7;
        else if(yPos>=336 && yPos<384)
            //First NPC image
              image = npc1;
        else if(yPos>=384 && yPos<432)
            //second NPC image
              image = npc2;
        else if(yPos>=432 && yPos<480)
            //Third NPC image
              image = npc3;
        else if(yPos>=480 && yPos<528)
            //First Yard Decoration image
              image = decor1;
        else if(yPos>=528 && yPos<576)
            //Second Yard Decoration image
              image = decor2;
        else if(yPos>=576 && yPos<=625)
            //Third Yard Decoration image
              image = decor3;
    }
    //If click is within Game Pane
    else if (xPos>75 && yPos<625){
        //A tool has been selected
        if(image!=null){
            placedTool = this.image;
            this.image = null;
            placeable = true;
        }
    }

    if(placeable && this.image==null){
        GamePiece newImg = new GamePiece(placedTool, xPos, yPos);
        gamePane.additions.add(newImg);
        gamePane.repaint();
        System.out.println("IMAGE PLACED @ " + xPos + ", " + yPos);
        placeable = false;
    }

    System.out.println("CLICK: (" + xPos + "," + yPos +")");
}

The images were added over top of the background image, by the previously given paintComponent method. They are a little off position, but still visible.

only a comments

  1. post an SSCCE short runnable, compilable

  2. why there is yPos = event.getY()-25; whats logics representing an integer at -25

  3. store all ImageIcons in local variable, store those ImageIcons in any array or List in the case that there is fixed logics instead of get coordinates and then load image = new ImageIcon(getClass().getResource( painted in paintComponent, do not provide any FileIO at runtime

  • create an grid of JLabels laid by GridLayout, add MouseListener to every JLabels, change an JLabel.setIcon(myImageIcon) from Mouse Event, rest of logics I'm missing without an SSCCE

for example

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.Icon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;

public class ChessBoard extends JFrame {

    private JFrame frame = new JFrame();
    private JPanel panel = new JPanel();
    private Icon errorIcon = UIManager.getIcon("OptionPane.errorIcon");
    private Icon infoIcon = UIManager.getIcon("OptionPane.informationIcon");
    private Icon warnIcon = UIManager.getIcon("OptionPane.warningIcon");
    private Icon questnIcon = UIManager.getIcon("OptionPane.questionIcon");
    private JButton button = new JButton("Reset my board");

    public ChessBoard() {
        panel.setLayout(new GridLayout(8, 8, 0, 0));
        for (int i = 0; i < 64; i++) {
            final JLabel label = new JLabel();
            label.setIcon(errorIcon);
            label.addMouseListener(new MouseAdapter() {
                @Override
                public void mouseClicked(MouseEvent e) {
                    if (e.getButton() == MouseEvent.BUTTON3) {
                        label.setIcon(infoIcon);
                    } else {
                        label.setIcon(warnIcon);
                    }
                }

                @Override
                public void mouseEntered(MouseEvent me) {
                    label.setIcon(questnIcon);
                }
            });
            panel.add(label);
        }
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                for (Component c : panel.getComponents()) {
                    if (c instanceof JLabel) {
                        JLabel label = (JLabel) c;
                        label.setIcon(errorIcon);
                    }
                }
            }
        });
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(panel);
        frame.add(button, BorderLayout.SOUTH);
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                new ChessBoard();
            }
        });
    }
}

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