java - 更改绘画面板中的绘画图像

Question

我试图通过将新图像目录发送到我的绘画面板，然后将图像变量更改为该图像来更改正在绘制的图像。我已经测试了代码以确保目录能够通过，但图像永远不会改变。他们似乎只是忽略了新的图像并继续绘制前一个图像。我对困惑的代码表示歉意，但我已经调整了几个小时，试图改变图像，但我感到很沮丧。

public class painting extends JPanel {
    private String BGDir;
    private String Dir;
    private int Width;
    private int Height;
    private Image image1;
    private Image image2;

    public painting(int h, int w, String BG, String Char) {
        BGDir = BG;
        Dir = Char;
        Height = h;
        Width = w;
        System.out.println(BGDir);
        System.out.println(Dir);
        try {
            image1 = (new ImageIcon(Char)).getImage();
            image2 = (new ImageIcon(BG)).getImage();
        } catch (Exception e) {
            System.out.println("no such file");
        }
        repaint();
    }

    public void update(Graphics g) {
        paintComponent(g);
    }

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        System.out.println(BGDir);
        System.out.println(Dir);
        // PAINTS THE BACKGROUND
        g2.drawImage(image2, 0, 0, getWidth(), (int) (getWidth() * .533), null);
        // PAINTS THE SCALED CHARACTER
        g2.drawImage(image1, (int) (Width / 6.22), (int) (Height * .246),
                (int) (Height * .754 * .2376), (int) (Height * .754), null);
        repaint();

    }
}

Answer 1

我使用 BufferedImage，但这是我拥有的工作代码的示例。

public class PaintPanel extends JPanel {

    private static final long serialVersionUID = 1L;

    BufferedImage icon;

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.drawImage(getBufferedIcon(), 12, 12, null);
    }

    public void setBufferedIcon(BufferedImage icon) {
        this.icon = icon;
    }

    private BufferedImage getBufferedIcon() {
        return icon;
    }
}

忽略 12 的偏移量，那只是因为我从我的一个项目中复制了它。我在另一个类中所做的就是创建 PaintPanel 并设置 BufferedIcon。

每次我想更新图标时，我都会调用PaintPanel.setBufferedIcon(icon);，然后调用PaintPanel.repaint();

请记住为PaintPanel命名，我只是这么调用它，以便您可以更轻松地阅读代码:)