Question

我正在学习摆动图形，我想尝试在java中更改光标颜色。所以我下载了一些金色星星的gif文件试图用于我的光标，但是当我将图像添加为ImageIcon时，它变成了星星＆＃39;颜色变黑。

编辑：更改语法

import java.awt.Dimension;
import java.awt.Image;
import java.awt.Point;
import java.awt.Toolkit;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;


public class stuff {
    public static void main (String[] args)
    {
        JFrame frame = new JFrame("FRAME");
        JPanel lpanel = new JPanel();
        frame.setContentPane(lpanel);
        ImageIcon goldStar = new ImageIcon("./res/goldStar.gif");
        JLabel gs = new JLabel(goldStar);
        lpanel.add(gs);

        goldStar = new ImageIcon(goldStar.getImage().getScaledInstance((int)(goldStar.getIconWidth()/13), (int)(goldStar.getIconHeight()/13), Image.SCALE_SMOOTH));
        lpanel.setCursor(Toolkit.getDefaultToolkit().createCustomCursor(goldStar.getImage(),new Point(0,0), "custom cursor"));
        //I think these two lines are creating the problem.

        lpanel.setPreferredSize(new Dimension(1600,900));
        frame.setVisible(true);
        frame.pack();
    }
}

我查看了光标的一些方法，但我找不到任何可以帮助我的方法。

这是我试图整合为鼠标光标的图片：

Answer 1

您可以按照here所述加载gif图像的帧并循环它们。

import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class Main {

    private int currentIndex;

    public Main() throws IOException {
        JFrame frame = new JFrame("FRAME");
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        JPanel panel = new JPanel();
        frame.setContentPane(panel);

        List<Cursor> cursors = new ArrayList<>();
        List<BufferedImage> frames = getFrames("GWigb.gif");
        for (BufferedImage image : frames) {
            cursors.add(Toolkit.getDefaultToolkit().createCustomCursor(image, new Point(0, 0), "cursor image"));
        }

        Timer timer = new Timer(50, (actionEvent) -> {
            panel.setCursor(cursors.get(currentIndex++));
            if (currentIndex >= cursors.size())
                currentIndex = 0;
        });
        timer.start();

        panel.setPreferredSize(new Dimension(1600, 900));
        frame.setVisible(true);
        frame.pack();
    }

    public List<BufferedImage> getFrames(String gif) throws IOException {
        List<BufferedImage> frames = new ArrayList<>();
        ImageReader reader = ImageIO.getImageReadersByFormatName("gif").next();
        File input = new File(gif);
        ImageInputStream stream = ImageIO.createImageInputStream(input);
        reader.setInput(stream);

        int count = reader.getNumImages(true);
        for (int index = 0; index < count; index++) {
             frames.add(reader.read(index));
        }
        return frames;
    }

    public static void main(String[] args) throws IOException {
        new Main();
    }

}

Answer 2

您应该考虑使用非动画图片，因为Toolkit.createCustomCursor的文档指出：

请注意，多帧图像无效，可能导致此方法挂起。

或者，您可以使用一组Cursor个对象（在您的情况下为自定义对象），并在Thread中创建动画。

以下是一个示例：Change Cursor in a thread for animation : Cursor。

你如何改变java中的光标颜色？

2 个答案: