在Java中将单击的像素的颜色更改为红色？

Question

当我单击图像的像素时，我希望将该像素更改为红色。我对 Java 中的图形没有太多经验，所以我可能会遗漏一些必不可少的东西。感谢您提供的任何帮助。public class Main {static BufferedImage image;public static void main(String[] args) {    try {        image = ImageIO.read(new File("pic.png"));    } catch (IOException e) {        e.printStackTrace();    }    JFrame frame = new JFrame();    frame.getContentPane().setLayout(new FlowLayout());    JLabel label = new JLabel(new ImageIcon(image));    // change the pixels to random colors when hovering over them    label.addMouseListener(new MouseAdapter() {        @Override        public void mouseClicked(MouseEvent e) {            super.mouseClicked(e);            System.out.println("CLICKED: " + "(" + e.getX() + "," + e.getY() + ")");            //getColorOfPixel(e.getX(), e.getY());            changeColorOfPixel(e.getX(), e.getY());        }    });    frame.getContentPane().add(label);    frame.pack();    frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);    frame.setVisible(true);}public static void changeColorOfPixel(int xCoordinateClicked, int yCoordinateClicked) {    int width = image.getWidth();    int height = image.getHeight();    int[][] pixels = new int[width][height];    for(int i = 0; i < width; i++) {        for(int j = 0; j < height; j++) {            pixels[i][j] = image.getRGB(xCoordinateClicked, yCoordinateClicked);            if(i == xCoordinateClicked && j == yCoordinateClicked) {                Color newColor = Color.RED;                image.setRGB(xCoordinateClicked, yCoordinateClicked, newColor.getRGB());            }        }    }}}

Answer 1

您需要frame.repaint();在像素颜色更改后调用，因此例如只需更改这样的MouseAdapter定义（假设frame也将定义为static：

    label.addMouseListener(new MouseAdapter() {

        @Override

        public void mouseClicked(MouseEvent e) {

            super.mouseClicked(e);

            System.out.println("CLICKED: " + "(" + e.getX() + "," + e.getY() + ")");

            image.setRGB(e.getX(), e.getY(), Color.RED.getRGB());

            frame.repaint();

        }

    });