java - 如何删除 GridLayout (Java) 中 ImageIcons 之间的空间

Question

我正在制作一款依赖于在网格中放置图 block 的 Java 游戏。我在 GridLayout 中使用了 ImageIcon 和 JLabel。我在创建 GridLayout 时将垂直和水平都设置为零，并且所有使用的图像中都没有额外的空间。

解决此问题的最佳方法是什么？

//Sets up the game canvas
private void setUpCanvasPanel(){
    //Adjusts the panel settings
    canvasPanel.setLayout(new GridLayout(Main.diameter, Main.diameter, 0 ,0));

    //Adds panel to masterpanel
    resetc();
    c.gridx = 0;
    c.gridy = 1;
    c.fill = GridBagConstraints.BOTH;
    c.weightx = 1.0;
    c.weighty = 1.0;

    masterPanel.add(canvasPanel, c);
}

//Renders the game canvas
public void renderCanvas(){
    ImageIcon[] iconArray = new ImageIcon[Main.diameter * Main.diameter];
    JLabel[] labelArray = new JLabel[Main.diameter * Main.diameter];
    int count = 0;

    for(int i = 0; i < Main.diameter; i ++){
        for(int j = 0; j < Main.diameter; j ++){
            iconArray[count] = new ImageIcon("textures/" + Main.renderer.renderedWorld[i][j] + ".jpeg"); 
            labelArray[count] = new JLabel(iconArray[count]);
            canvasPanel.add(labelArray[count]);

            count ++;
        }
    }

    count = 0;

    canvasPanel.setVisible(true);
}

编辑:请注意，在本例中 Main.diameter 设置为 100。

Answer 1

问题是 GridLayout 将为所有组件提供等量的空间，将可用空间除以行/列数，因此随着可用空间的增加，每个单独的单元格也会增加，但组件保持其首选大小。

你可以...

使用像 WrapLayout 这样的东西随着水平空间的减少，它会自动按行向下组件

你可以...

使用 GridBagLayout，它允许您维护行/列，但可以更好地控制各个组件占用的可用空间

...使用GridBagConstraints#insets在组件之间添加间距

...添加 GridBagConstraints#weightx、GridBagConstraints#weightx 和 GridBagConstraints#fill 以填充可用空间

看看Laying Out Components Within a Container , How to Use GridLayout和 How to Use GridBagLayout了解更多详情

...还有一些测试代码...

import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.text.NumberFormat;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class Test {

    public static void main(String[] args) {
        new Test();
    }

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TexturePane extends JPanel {

        public TexturePane(Color background) {
            setBackground(background);
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(20, 20);
        }

    }

    public class TestPane extends JPanel {

        public TestPane() {
            int total = 10 * 10;
            Color[] rowColors = new Color[]{
                Color.RED,
                Color.GREEN,
                Color.BLUE,
                Color.CYAN,
                Color.MAGENTA,
                Color.ORANGE,
                Color.PINK,
                Color.YELLOW,
                Color.DARK_GRAY,
                Color.GRAY,
            };
            setLayout(new GridBagLayout());
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.insets = new Insets(1, 1, 1, 1);
            gbc.weightx = 1;
            gbc.weighty = 1;
            gbc.fill = GridBagConstraints.BOTH;
            for (int row = 0; row < 10; row++) {
                gbc.gridy = row;
                for (int col = 0; col < 10; col++) {
                    gbc.gridx = col;
                    double progress = (row * 10) + col;
                    Color color = blend(Color.BLACK, rowColors[row], col / 10d);
                    add(new TexturePane(color), gbc);
                }
            }
        }

    }
    public static Color blend(Color color1, Color color2, double ratio) {
        float r = (float) ratio;
        float ir = (float) 1.0 - r;

        float rgb1[] = new float[3];
        float rgb2[] = new float[3];

        color1.getColorComponents(rgb1);
        color2.getColorComponents(rgb2);

        float red = rgb1[0] * r + rgb2[0] * ir;
        float green = rgb1[1] * r + rgb2[1] * ir;
        float blue = rgb1[2] * r + rgb2[2] * ir;

        if (red < 0) red = 0;
        else if (red > 255) red = 255;
        if (green < 0) green = 0;
        else if (green > 255) green = 255;
        if (blue < 0) blue = 0;
        else if (blue > 255) blue = 255;

        Color color = null;
        try {

            color = new Color(red, green, blue);

        } catch (IllegalArgumentException exp) {

            NumberFormat nf = NumberFormat.getNumberInstance();
            System.out.println(nf.format(red) + "; " + nf.format(green) + "; " + nf.format(blue));

        }
        return color;
    }

}

你必须自己包含 WrapLayout 并从上面的代码中删除对 GridBagLayout 的引用，但我只用了这些