JButton 中的 Java 图标大小

Question

我尝试将 JIcon 放入我的 JButtons 中，但有一个特定的它不适合。我尝试了不同的窗口和图标大小，但没有任何帮助，鲍尔的图标比我聪明。整个计划由 13x16 按钮组成，采用网格布局，边框为空。我不会发送整个代码，但可能只发送其中的相关部分。我尝试在新项目上制作按钮的网格布局，结果相同，球不适合

我尝试了球图像 40x40、50x50、60x60，其 jpg 文件。球应该看起来饱满而漂亮，但它的一侧被切掉了

编辑:我更改了代码以准确显示发生了什么，但仍然找不到错误。

import java.awt.*;
import javax.swing.*;
import javax.swing.border.Border;




public class Line extends JFrame {


    private JPanel jPBoard;
    private JButton jBFill[] = new JButton[209];
    private Border empty;
    private int fillCounter;
    private int position;
    private Icon iconBall;
    private Icon iconSand;

    public static void main(String[] args) 
    {
        Line frame = new Line();
        frame.setSize(520, 640); 
        frame.createGUI(); 
        frame.setVisible(true);
    }

    private void createGUI()
    {
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        Container window = getContentPane();


        //Icons
        try  
        {   
            iconBall = new ImageIcon(Toolkit.getDefaultToolkit().createImage(CBallMaze.class.getResource("images/ball.png")));
            iconSand = new ImageIcon(Toolkit.getDefaultToolkit().createImage(CBallMaze.class.getResource("images/sand.jpg")));
        }

        catch (Exception e)
        {
            System.err.println("Couldn't process"+e);
        }     


        //Main pannel settings

        jPBoard = new JPanel(); 
        jPBoard.setPreferredSize(new Dimension(520, 640));              
        jPBoard.setBackground(Color.GRAY);
        window.add(jPBoard);                            
        jPBoard.setLayout(new GridLayout(13, 16));

        empty = BorderFactory.createEmptyBorder();


        //Icon to Image, resizing

        Image img = ((ImageIcon)iconBall).getImage();
        Image imageBall = img.getScaledInstance(50, 50,  java.awt.Image.SCALE_SMOOTH);
        iconBall = new ImageIcon(imageBall);

        for (fillCounter = 1; fillCounter < 209; fillCounter++) {           


        // Filling the field    


            jBFill[fillCounter] = new JButton(""+fillCounter);          
            jBFill[fillCounter].setBorder(empty); 
            position = 24;
            jPBoard.add(jBFill[fillCounter]);

            jBFill[fillCounter].setIcon(iconSand);


            if (fillCounter == 15) 
            {               
                jBFill[fillCounter].setBackground(Color.PINK);
            }

            if (position == fillCounter) 
            {               
                jBFill[fillCounter].setIcon(iconBall);
            }
        }
    }
}

Answer 1

一个mcve对于您描述的问题可能是:

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.image.BufferedImage;
import javax.swing.BorderFactory;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.border.Border;

public class Line extends JFrame {

    private static int rows = 3, cols = 3;
    private JButton jBFill[] = new JButton[rows*cols];

    Line(){
        createGUI();
        pack();//apply preferred dimensions 
        setVisible(true);
    }

    public static void main(String[] args)  {

        SwingUtilities.invokeLater(() -> new Line());
    }

    private void createGUI(){
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        //For posts it is more convenient to use generated images
        Image ballImage = createImage(Color.BLUE);
        Icon  ballIcon = new ImageIcon(ballImage);

        Image sandImage = createImage(Color.YELLOW);
        Icon  sandIcon = new ImageIcon(sandImage);

        JPanel jPBoard = new JPanel();
        jPBoard.setBackground(Color.GRAY);
        add(jPBoard);
        jPBoard.setLayout(new GridLayout(rows, cols));
        Border empty = BorderFactory.createEmptyBorder();

        for (int fillCounter = 0; fillCounter < (rows * cols); fillCounter++) {
            JButton button = new JButton(""+fillCounter);
            button.setBorder(empty);
            button.setIcon(((fillCounter%2) ==0) ?  sandIcon : ballIcon);
            button.setPreferredSize(new Dimension(125,40)); //set preferred dimension to button 
            jBFill[fillCounter] = button;
            jPBoard.add(button);
        }
    }

    //creates 100x100 image
    private BufferedImage createImage(Color color) {

        int iconWidth =100;
        BufferedImage img = new BufferedImage(iconWidth , iconWidth,
                BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2 = img.createGraphics();
        g2.setColor(color);
        g2.fillOval(1, 1, iconWidth - 2, iconWidth - 2);
        g2.dispose();
        return img;
    }
}

输出清楚地显示了问题:所使用的 100x100 球形图标被裁剪:

一种补救措施，如 one of the links 中建议的那样在我的评论中，是在将图像应用到按钮之前重新缩放图像。替换这些行:

    Image ballImage = createImage(Color.BLUE);
    Icon  ballIcon = new ImageIcon(ballImage);
    Image sandImage = createImage(Color.YELLOW);
    Icon  sandIcon = new ImageIcon(sandImage);

与:

    Image ballImage = createImage(Color.BLUE);
    Image scaledBall = ballImage.getScaledInstance(15, 15, Image.SCALE_SMOOTH ) ;
    Icon ballIcon = new ImageIcon(scaledBall);
    Image sandImage = createImage(Color.YELLOW);
    Image scaledSand = sandImage.getScaledInstance(15, 15, Image.SCALE_SMOOTH ) ;
    Icon sandIcon = new ImageIcon(scaledSand);

并查看带有缩放图像的输出: