如何在Java中制作Circle image Label？

Question

如何在Java中制作圆形图片标签？

我想制作圆形图片标签但是我做不到..大家帮帮我..T.T

我尝试为添加图像图标制作圆形面板，但没有成功。

请帮帮我...

Answer 1

我认为你应该改变策略，而不是尝试修改组件的输出，而是修改输入...

所有这一切都是将圆形（基于 alpha 的）蒙版应用于另一个图像

    BufferedImage master = ImageIO.read(new File("/Volumes/Disk02/Dropbox/MegaTokyo/thumnails/megatokyo_omnibus_1_3_cover_by_fredrin-d4oupef.jpg"));

    int diameter = Math.min(master.getWidth(), master.getHeight());
    BufferedImage mask = new BufferedImage(master.getWidth(), master.getHeight(), BufferedImage.TYPE_INT_ARGB);

    Graphics2D g2d = mask.createGraphics();
    applyQualityRenderingHints(g2d);
    g2d.fillOval(0, 0, diameter - 1, diameter - 1);
    g2d.dispose();

    BufferedImage masked = new BufferedImage(diameter, diameter, BufferedImage.TYPE_INT_ARGB);
    g2d = masked.createGraphics();
    applyQualityRenderingHints(g2d);
    int x = (diameter - master.getWidth()) / 2;
    int y = (diameter - master.getHeight()) / 2;
    g2d.drawImage(master, x, y, null);
    g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.DST_IN));
    g2d.drawImage(mask, 0, 0, null);
    g2d.dispose();

    JOptionPane.showMessageDialog(null, new JLabel(new ImageIcon(masked)));

这样做的好处是您可以获得软裁剪（setClip 不提供）并且不会弄乱组件的现有裁剪形状

和applyQualityRenderingHints...

public static void applyQualityRenderingHints(Graphics2D g2d) {

    g2d.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
    g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    g2d.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
    g2d.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE);
    g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
    g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
    g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
    g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);

}

Answer 2

您可以使用 Area class 创建剪辑区域：

BufferedImage image = ImageIO.read(new File("..."));
Area clip = new Area( new Rectangle(0, 0, image.getWidth(), image.getHeight()) );
Area oval = new Area( new Ellipse2D.Double(0, 0, image.getWidth() - 1, image.getHeight() - 1) );
clip.subtract( oval );
Graphics g2d = image.createGraphics();
g2d.setClip( clip );
g2d.setColor( Color.BLACK );
g2d.fillRect(0, 0, image.getWidth(), image.getHeight());
JOptionPane.showMessageDialog(null, new JLabel(new ImageIcon(image)));

Answer 3

转到博客 NiceApplication1.BlogSpot.Com，下载新的 Nice Application 1 Home Stupendous，然后在解压后转到 dist 文件夹并打开 Java Jar Nice Application 1，然后取出 jar Nice_Application_1_Files，并仅在某些行中转换您的方法以节省 space。

在 jar 之后仅添加以下方法以及您的文件位置和调用方法。

导入Nice_Application_1.Icon;

private void Addicon() 抛出 java.lang.NullPointerException、IOException {

    Icon test = new Icon("C:\Image.jpg");

    String nice = test.icon();

    BufferedImage Appli1 = test.Application1;

    jToggleButton0.setIcon(new ImageIcon(Appli1));

}

//你可以用上面的方法使用圆形图标。

以上示例，如果需要在弹出窗口中使用 Jbutton，请键入 JOptionPane.showMessageDialog(null, new JLabel(new ImageIcon(Appli1)));

下载jar后，您还可以获得更多优势

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