如何在Java中制作圆形图像标签？

如何在Java中制作圆形图像标签？

我想制作圆形图像标签但是我不能这样做..嘿伙计们帮助我… .TT

我尝试使用圆形面板添加图像图标，但这不起作用。

请帮帮我…

Answer 1

我认为你应该改变你的方向，而不是试图修改组件的输出，而是修改输入…

所以这一切都是将圆形（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))); 

这样做的好处是你可以得到软剪辑（ setClip不提供）以及不弄乱组件的现有剪裁形状

并且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类创建剪辑区域：

 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)));