运行java swing项目时如何修复模糊图像

问题描述

我目前正在学习 java swing builder 作为一项新技术技能.我需要研究如何在画布上导入图像.是的，它成功导入，图像清晰且不模糊.但是，当我运行项目时，我导入到项目中的图像变得模糊.我不知道为什么会这样.我研究了一些功能，例如缩放，但没有任何反应它会输出相同的输出变得模糊.

I currently studying the java swing builder as a new tech skills. I need to study how to import the image on my canvas. Yes it successfully imported and the image clearly define and not blurry.however when I run the project the image that I import to the project it goes blurry. I don't know why it happens. I research some functionality like get scaled but nothing happens it goes same output it get blurry.

图片尺寸:250x250

Image Dimension: 250x250

这是我在我的项目中实现的代码:

Here is my code that I implement on my project:

private Image doctor_ppe = new ImageIcon(LoginScreen.class.getResource("/assets/large.png")).getImage().getScaledInstance(250, 250, Image.SCALE_SMOOTH);


JLabel lblDds = new JLabel("");
    lblDds.setVerticalAlignment(SwingConstants.BOTTOM);
    lblDds.setHorizontalAlignment(SwingConstants.CENTER);
    lblDds.setIcon(new ImageIcon(doctor_ppe));
    lblDds.setBounds(59, 305, 236, 251);
    panel.add(lblDds);

不可运行项目和可运行项目的区别:

Difference of not runnable project and runnable project:

图像不模糊:

运行项目后图像模糊:

希望有人经历过这个，希望对我的问题有所帮助谢谢.

Hope someone experience this, hope will help on my problemthank you.

推荐答案

可能是因为您的桌面使用了大于 1.0 的缩放因子，所以在绘制图像时会放大.

Probably because your desktop is using a scaling factor greater than 1.0, so the image is upscaled when it is painted.

如果您想更改整个应用程序的缩放比例，您可以尝试:

If you want to change the scaling for the entire application you can try:

1. 使用命令行-Dsun.java2d.uiScale=1.0，或
2. 使用 System.setProperty("sun.java2d.uiScale", "1.0") 以编程方式设置

另一种选择可能是仅防止 Icon 缩放:

Another option might be to prevent only the Icon from scaling:

import java.awt.*;
import java.awt.geom.AffineTransform;
import javax.swing.*;


public class NoScalingIcon implements Icon
{
    private Icon icon;

    public NoScalingIcon(Icon icon)
    {
        this.icon = icon;
    }

    public int getIconWidth()
    {
        return icon.getIconWidth();
    }

    public int getIconHeight()
    {
        return icon.getIconHeight();
    }

    public void paintIcon(Component c, Graphics g, int x, int y)
    {
        Graphics2D g2d = (Graphics2D)g.create();

        AffineTransform at = g2d.getTransform();

        int scaleX = (int)(x * at.getScaleX());
        int scaleY = (int)(y * at.getScaleY());

        int offsetX = (int)(icon.getIconWidth() * (at.getScaleX() - 1) / 2);
        int offsetY = (int)(icon.getIconHeight() * (at.getScaleY() - 1) / 2);

        int locationX = scaleX + offsetX;
        int locationY = scaleY + offsetY;

        //  Reset scaling to 1.0 by concatenating an inverse scale transfom

        AffineTransform scaled = AffineTransform.getScaleInstance(1.0 / at.getScaleX(), 1.0 / at.getScaleY());
        at.concatenate( scaled );
        g2d.setTransform( at );

        icon.paintIcon(c, g2d, locationX, locationY);

        g2d.dispose();
    }

    public static void main(String[] args)
    {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }

    public static void createAndShowGUI()
    {
        JButton button = new JButton( "Button" );
        NoScalingIcon icon = new NoScalingIcon( new ImageIcon("box.jpg") );
        button.setIcon( icon );

        JPanel panel = new JPanel( );
        panel.add( button );

        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(panel);
        f.setSize(200, 200);
        f.setLocationRelativeTo( null );
        f.setVisible(true);
    }
}

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