从mouses X和Y位置获取bufferedImage的像素RGB

我正在制作带有图像的彩色选择器程序。 程序首先加载到图像中，然后当您将鼠标hover在图像上时，它将获得鼠标X和Y位置的当前像素RGB值。 我已经设置了框架并加载了它们的图像，有人可以帮助我使用像素吗？

package net.ogpc.settings; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.image.BufferedImage; import javax.imageio.ImageIO; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JTextField; import java.awt.BorderLayout; import java.awt.Container; import java.awt.Cursor; import java.awt.FlowLayout; import java.awt.GridLayout; import java.io.File; import java.io.IOException; public class ColorChooser implements Runnable, MouseListener{ public static String path = "FileIO Plug-Ins\\Resources\\color-picker.png"; public static boolean running = false; public static String r = "100"; public static String g = "100"; public static String b = "100"; JFrame frame = new JFrame("Choose A Color"); JTextField JR = new JTextField(); JTextField JG = new JTextField(); JTextField JB = new JTextField(); Container colorImage = new Container(); Container east = new Container(); public ColorChooser() { frame.setSize(400, 300); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLocationRelativeTo(null); frame.setCursor(new Cursor(Cursor.CROSSHAIR_CURSOR)); frame.setResizable(false); //set up JFrame east.setLayout(new GridLayout(3, 3)); east.add(JR); east.add(JG); east.add(JB); frame.add(east); //import the color chooser image Import(); frame.setVisible(true); running = true; run(); } public void run() { while (running) { getPixel(); try { Thread.sleep(250); }catch (Exception ex) { ex.printStackTrace(); } } } public void getPixel() { //get it m9! JR.setText(r); JG.setText(g); JB.setText(b); System.out.println("r: " + r + " g: " + g + " b: " + b); } public void Import() { colorImage.setLayout(new FlowLayout()); try { File file = new File(path); BufferedImage image; image = ImageIO.read(file); JLabel label = new JLabel(new ImageIcon(image)); label.addMouseListener(this); colorImage.add(label, BorderLayout.NORTH); frame.getContentPane().add(colorImage, BorderLayout.WEST); } catch (IOException ex) { ex.printStackTrace(); } } public static void main(String[] args) { new ColorChooser(); } public void mouseClicked(MouseEvent arg0) { } public void mouseEntered(MouseEvent arg0) { } public void mouseExited(MouseEvent arg0) { } public void mousePressed(MouseEvent arg0) { //each time you click on the image... print out the pixel RGB here } public void mouseReleased(MouseEvent arg0) { } } 

Answer 1

你的while-loop让我感到害怕，它说你可能无法理解Swing或事件驱动的环境是如何工作的。 缺点是，你不需要它，将来你也不应该使用这种技术……

基本上，您将需要访问图像的BufferedImage实例，因为这样可以访问基础栅格数据。

如果您对布局要小心，可以使用JLabel显示图像，只需向其添加MouseMotionListener并监视鼠标移动，然后拾取其下方像素的压缩int颜色。

然后，您需要将此打包的int转换为RGB值。 现在你可以做一些操作，但说实话，使用Color(int)更简单。

 import java.awt.BorderLayout; import java.awt.Color; import java.awt.EventQueue; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; import javax.swing.border.EmptyBorder; public class ColorPicky { public static void main(String[] args) { new ColorPicky(); } public ColorPicky() { 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 img; private JLabel label; private JPanel fields; private JTextField red; private JTextField green; private JTextField blue; public TestPane() { setLayout(new GridBagLayout()); GridBagConstraints gbc = new GridBagConstraints(); gbc.gridwidth = GridBagConstraints.REMAINDER; label = new JLabel(); try { img = ImageIO.read(new File("C:\\hold\\thumbnails\\issue459.jpg")); label.setIcon(new ImageIcon(img)); } catch (IOException ex) { ex.printStackTrace(); } add(label, gbc); fields = new JPanel(); fields.setBorder(new EmptyBorder(5, 5, 5, 5)); red = new JTextField(3); green = new JTextField(3); blue = new JTextField(3); fields.add(red); fields.add(green); fields.add(blue); add(fields, gbc); label.addMouseMotionListener(new MouseAdapter() { @Override public void mouseMoved(MouseEvent e) { int packedInt = img.getRGB(e.getX(), e.getY()); Color color = new Color(packedInt, true); fields.setBackground(color); red.setText(Integer.toString(color.getRed())); green.setText(Integer.toString(color.getGreen())); blue.setText(Integer.toString(color.getBlue())); } }); } } } 

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