获取鼠标光标下的 RGB 值

我正在尝试构建一个程序来检测鼠标光标下方的颜色，然后在屏幕上的窗口中显示颜色和 RGB 值。我对 Java 非常陌生，所以什么都不知道。在朋友的帮助下，我编写了两个代码，第一个获取缓冲图像的特定坐标的 RGB 值，另一个获取用户定义的 RGB 值并显示其中包含颜色的窗格。我的问题是“如何让程序检测鼠标光标下的颜色，无论鼠标滚动到什么位置？

public class Buffered_Image 
{
public static void main(String[] args) throws IOException 
{
    BufferedImage bi = ImageIO.read(new File("C:/Users/user/Pictures/Hornet.jpg"));
    Color c = new Color(bi.getRGB(50,40));
    int red=c.getRed();
    int green=c.getGreen();
    int blue=c.getBlue();

    System.out.print("Red " + red + " Green " + green+ " Blue" + blue + "\n" );
}
}




public class RGB_Pane 
{

public static void main(String[] args) 
{
    JFrame F = new JFrame("RGB");
    Panel Pan = new Panel();
    F.getContentPane().add(Pan);
    F.pack();
    F.setVisible(true);
    F.setSize(300, 300);
}
}

class Panel extends JPanel
{
public Panel()
{ 
    setPreferredSize(new Dimension(200,200));
    int Red = Integer.parseInt(JOptionPane.showInputDialog("Enter value for RED"));
    int Green = Integer.parseInt(JOptionPane.showInputDialog("Enter value for Green"));
    int Blue = Integer.parseInt(JOptionPane.showInputDialog("Enter value for BLUE"));
    Color Defined_Color = new Color(Red,Green,Blue);
    setBackground(Defined_Color);
}
}

正如@Hovercraft 所指出的。

首先看Robot#getPixelColor.

您需要知道鼠标光标在哪里，虽然没有“简单”的方法来跟踪光标，但您可以使用以下命令获取它的当前位置MouseInfo#getPointerInfo

更新了示例

这是这个概念的一个小例子。这是基于鼠标光标的运动来工作的。一个可能的增强功能是当光标下的颜色发生变化时也通知监视器侦听器......

public class WhatsMyColor {

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

    public WhatsMyColor() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException ex) {
                } catch (InstantiationException ex) {
                } catch (IllegalAccessException ex) {
                } catch (UnsupportedLookAndFeelException ex) {
                }

                try {
                    JFrame frame = new JFrame();
                    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                    frame.setLayout(new BorderLayout());
                    frame.add(new MouseColorPane());
                    frame.setSize(400, 200);
                    frame.setLocationRelativeTo(null);
                    frame.setVisible(true);
                } catch (Exception exp) {
                    exp.printStackTrace();
                }

            }
        });
    }

    public class MouseColorPane extends JPanel implements MouseMonitorListener {

        private Robot robot;

        private JLabel label;

        public MouseColorPane() throws AWTException {

            label = new JLabel();

            setLayout(new GridBagLayout());
            add(label);

            robot = new Robot();
            PointerInfo pi = MouseInfo.getPointerInfo();
            updateColor(pi.getLocation());
            MouseMonitor monitor = new MouseMonitor();
            monitor.setMouseMonitorListener(this);
            monitor.start();

        }

        protected void updateColor(Point p) {

            Color pixelColor = robot.getPixelColor(p.x, p.y);
            setBackground(pixelColor);

            label.setText(p.x + "x" + p.y + " = " + pixelColor);

        }

        @Override
        public void mousePositionChanged(final Point p) {
            SwingUtilities.invokeLater(new Runnable() {

                @Override
                public void run() {
                    updateColor(p);
                }

            });
        }
    }

    public interface MouseMonitorListener {

        public void mousePositionChanged(Point p);
    }

    public static class MouseMonitor extends Thread {

        private Point lastPoint;
        private MouseMonitorListener listener;

        public MouseMonitor() {
            setDaemon(true);
            setPriority(MIN_PRIORITY);
        }

        public void setMouseMonitorListener(MouseMonitorListener listener) {
            this.listener = listener;
        }

        public MouseMonitorListener getMouseMonitorListener() {
            return listener;
        }

        protected Point getMouseCursorPoint() {
            PointerInfo pi = MouseInfo.getPointerInfo();
            return pi.getLocation();
        }

        @Override
        public void run() {
            lastPoint = getMouseCursorPoint();
            while (true) {
                try {
                    sleep(250);
                } catch (InterruptedException ex) {
                }

                Point currentPoint = getMouseCursorPoint();
                if (!currentPoint.equals(lastPoint)) {
                    lastPoint = currentPoint;
                    MouseMonitorListener listener = getMouseMonitorListener();
                    if (listener != null) {
                        listener.mousePositionChanged((Point) lastPoint.clone());
                    }
                }

            }
        }
    }
}