在jframe中模糊背景上创建一个透明的矩形
我在模糊背景上创建透明矩形时遇到问题。 我正在尝试在glasspane上完成这项任务。 这是我的代码片段。
void createBlur() { alpha = 1.0f; JRootPane root = SwingUtilities.getRootPane(jf); blurBuffer = GraphicsUtilities.createCompatibleImage(jf.getWidth(), jf.getHeight()); Graphics2D g2d = blurBuffer.createGraphics(); root.paint(g2d); g2d.dispose(); backBuffer = blurBuffer; blurBuffer = GraphicsUtilities.createThumbnailFast(blurBuffer, jf.getWidth() / 2); blurBuffer = new GaussianBlurFilter(5).filter(blurBuffer, null); }
其中，backBuffer和blurBuffer是BufferedImage和jf = JFrame的对象，alpha用于不透明度。 上述方法很好地创建了模糊效果。
这是在Panel上创建透明矩形的代码
protected void paintComponent(Graphics g) { int x = 34; int y = 34; int w = getWidth() - 68; int h = getHeight() - 68; int arc = 30; //Graphics2D g2 = currentGraphics.createGraphics(); //g2.drawImage(currentGraphics, 0, 0, null); Graphics2D g2 = (Graphics2D) g.create(); g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g2.setColor(new Color(0, 0, 0, 220)); g2.fillRoundRect(x, y, w, h, arc, arc); g2.setStroke(new BasicStroke(1f)); g2.setColor(Color.WHITE); g2.drawRoundRect(x, y, w, h, arc, arc); g2.dispose(); }
我现在陷入困境的是如何同时绘制模糊效果和透明矩形。 我没有在这里发布完整的代码，如果有人希望在这里看到代码的链接 。
这是样本输出的理想图像。 提前致谢。
我正在努力制作代码的正面和尾巴……
您无法调用super.paintComponent …如果您不小心，这可能会导致您遇到同样严重的问题。 一般经验法则，只需称之为;）
修改Graphics上下文的状态时要小心，例如……
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
会影响在此之后绘制的所有组件，并可能导致一些你没想到的有趣的图形故障……
jf.getGlassPane().setVisible(false); glassPanel = new GlassPanel(); jf.getGlassPane().setVisible(true);
似乎没有意义，因为使用jf.setGlassPane(glassPanel);设置组件jf.setGlassPane(glassPanel); 当你调用jf.getGlassPane().setVisible(true);时，它仍然是可见的组件jf.getGlassPane().setVisible(true); 。 这也意味着从未使用过GlassPane组件……
在paintComponent检查isVisible是没有意义的，因为Swing足够聪明，知道不要绘制不可见的组件……
现在，说了这么多……
如果你想在BlurPanel上绘画，你可以…绘制blurBuffer后绘制内容，这样你就可以在它上面绘制或者在BlurPanel窗格上添加另一个组件，其中包含你想要应用的绘图逻辑。 。
这是该概念的基本示例。 这会在玻璃窗格上添加另一个面板，根据需要绘制面板的自定义框架。
此示例使用个人库代码，仅作为概念的示例，而不是完全可运行的示例。
import core.ui.GlowEffectFactory; import core.ui.GraphicsUtilities; import core.util.ByteFormatter; import java.awt.BasicStroke; import java.awt.BorderLayout; import java.awt.Color; import java.awt.Container; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.Font; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import java.awt.Window; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.geom.RoundRectangle2D; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.text.DateFormat; import java.util.Date; import java.util.logging.Level; import java.util.logging.Logger; import javax.imageio.ImageIO; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JRootPane; import javax.swing.SwingUtilities; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; import javax.swing.border.EmptyBorder; public class TransparentTest { public static void main(String[] args) { new TransparentTest(); } public TransparentTest() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { } JFrame frame = new JFrame("Testing"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new BorderLayout()); frame.add(new TestPane()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } public class TestPane extends JPanel { private BufferedImage background; private BlurredGlassPane blurredGlassPane; private InfoPane infoPane; public TestPane() { try { background = ImageIO.read(new File("get your own image")); } catch (IOException ex) { ex.printStackTrace(); } blurredGlassPane = new BlurredGlassPane(); blurredGlassPane.setLayout(new GridBagLayout()); infoPane = new InfoPane(); infoPane.setFile(new File("get your own image")); blurredGlassPane.add(infoPane); JButton click = new JButton("Click"); click.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { Window win = SwingUtilities.getWindowAncestor(TestPane.this); if (win instanceof JFrame) { JFrame frame = (JFrame) win; frame.setGlassPane(blurredGlassPane); blurredGlassPane.setVisible(true); } } }); setLayout(new GridBagLayout()); add(click); } @Override public Dimension getPreferredSize() { return background == null ? new Dimension(200, 200) : new Dimension(background.getWidth(), background.getHeight()); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); if (background != null) { Graphics2D g2d = (Graphics2D) g.create(); int x = (getWidth() - background.getWidth()) / 2; int y = (getHeight() - background.getHeight()) / 2; g2d.drawImage(background, x, y, this); g2d.dispose(); } } } public static class InfoPane extends JPanel { protected static final int RADIUS = 20; protected static final int FRAME = 4; protected static final int INSET = RADIUS + FRAME; protected static final DateFormat DATE_FORMAT = DateFormat.getDateTimeInstance(); private JLabel name; private JLabel path; private JLabel length; private JLabel lastModified; private JLabel canExecute; private JLabel canRead; private JLabel canWrite; private JLabel isDirectory; private JLabel isHidden; public InfoPane() { setBorder(new EmptyBorder(INSET, INSET, INSET, INSET)); setOpaque(false); setLayout(new GridBagLayout()); GridBagConstraints gbc = new GridBagConstraints(); gbc.gridx = 0; gbc.gridy = 0; gbc.weightx = 1; gbc.anchor = GridBagConstraints.WEST; gbc.gridwidth = GridBagConstraints.REMAINDER; name = createLabel(Font.BOLD, 48); add(name, gbc); gbc.gridy++; path = createLabel(); add(path, gbc); gbc = new GridBagConstraints(); gbc.gridx = 0; gbc.gridy = 2; gbc.anchor = GridBagConstraints.WEST; length = createLabel(); lastModified = createLabel(); add(createLabel("Size: "), gbc); gbc.gridx++; gbc.insets = new Insets(0, 0, 0, 10); add(length, gbc); gbc.insets = new Insets(0, 0, 0, 0); gbc.gridx++; add(createLabel("Last Modified: "), gbc); gbc.gridx++; add(lastModified, gbc); } public JLabel createLabel(String text) { JLabel label = new JLabel(text); label.setForeground(Color.WHITE); return label; } public JLabel createLabel() { return createLabel(""); } public JLabel createLabel(int style, float size) { JLabel label = createLabel(); label.setFont(label.getFont().deriveFont(style, size)); return label; } public void setFile(File file) { name.setText(file.getName()); try { path.setText(file.getParentFile().getCanonicalPath()); } catch (IOException ex) { ex.printStackTrace(); } length.setText(ByteFormatter.format(file.length())); lastModified.setText(DATE_FORMAT.format(new Date(file.lastModified()))); file.canExecute(); file.canRead(); file.canWrite(); file.isDirectory(); file.isHidden(); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g.create(); GraphicsUtilities.applyQualityRenderingHints(g2d); int width = getWidth() - 1; int height = getHeight() - 1; int buffer = FRAME / 2; RoundRectangle2D base = new RoundRectangle2D.Double(buffer, buffer, width - FRAME, height - FRAME, RADIUS, RADIUS); g2d.setColor(new Color(0, 0, 0, 128)); g2d.fill(base); g2d.setColor(Color.WHITE); g2d.setStroke(new BasicStroke(FRAME, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND)); g2d.draw(base); g2d.dispose(); } } public class BlurredGlassPane extends JPanel { private BufferedImage background; @Override public void setVisible(boolean visible) { if (visible) { Container parent = SwingUtilities.getAncestorOfClass(JRootPane.class, this); if (parent != null) { JRootPane rootPane = (JRootPane) parent; BufferedImage img = new BufferedImage(rootPane.getWidth(), rootPane.getHeight(), BufferedImage.TYPE_INT_ARGB); Graphics2D g2d = img.createGraphics(); rootPane.printAll(g2d); g2d.dispose(); background = GlowEffectFactory.generateBlur(img, 40); } } super.setVisible(visible); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); g.drawImage(background, 0, 0, this); } } }