如何在Java中检测Image类中的点击事件？

发布于 2024-12-05 11:16:44 字数 390 浏览 1 评论 0原文

我正在通过创建一个简单的游戏来练习学习 Java。在我的简单游戏中，我想使用 AWT 图像类，并且我想单击图像类，它会弹出一个类似警报的对话框，

public class Sample
{
    Image img = getImage(getClass().getResource("0.jpg"));

    void paint (Graphics g)
    {
        g.drawImage(img,30,30,this);
    }
}

我希望如果我单击该图像，图像将检测到单击事件并显示一个警报对话框。

原文

I'm practicing to learn Java by creating a simple game. In my simple game, I want to use the AWT image class, and I want to click the image class, and it will pop up a dialog box like alert,

public class Sample
{
    Image img = getImage(getClass().getResource("0.jpg"));

    void paint (Graphics g)
    {
        g.drawImage(img,30,30,this);
    }
}

I want that if I clicked that image the image will detect the click event and it will show an alert dialog box.

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温柔嚣张 2024-12-12 11:16:44

最好寻找 Icon/ImageIcon 来显示JLabel 中的图片。然后，您只需添加并重写 MouseListener 中的正确方法用于监听 JLabel 的鼠标点击。

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×纯※雪 2024-12-12 11:16:44

前几天写了一个函数：

public boolean isBetween(float x1, float y1, float x2, float y2, float objeX, float objeY) {
    if ((x1 <= objeX && x2 >=objeX) || (x1 >=objeX && x2<=objeX )) {
        if ((y1 <= objeY && y2 >=objeY) || (y2 <= objeY && y1 >=objeY))
            return true;
    }
    else {
        return false;
    }
}

使用的时候，给出图像的四个点。最后两个点是点击点。
您必须添加一个鼠标侦听器。当事件发生时，您可以使用 isBetween 函数检查单击的点。如果返回 true，则您的图像已被点击。

I wrote a function some days ago:

public boolean isBetween(float x1, float y1, float x2, float y2, float objeX, float objeY) {
    if ((x1 <= objeX && x2 >=objeX) || (x1 >=objeX && x2<=objeX )) {
        if ((y1 <= objeY && y2 >=objeY) || (y2 <= objeY && y1 >=objeY))
            return true;
    }
    else {
        return false;
    }
}

When you use it, give four points of the image. And the last two points are the clicked points.
You must add a mouselistener. When event action, you check for the clicked point with isBetween function. If it returns true, you image was clicked.

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夜还是长夜 2024-12-12 11:16:44

您可以创建一个具有背景图像（您想要的图像）的自定义 JPanel。然后，您可以使用 JPanel 的功能来侦听单击事件。自定义 JPanel 可能是这样的（取自此处）：

class ImagePanel extends JPanel {

    private Image img;

    public ImagePanel(String img) {
        this(new ImageIcon(img).getImage());
    }

    public ImagePanel(Image img) {
        this.img = img;
        Dimension size = new Dimension(img.getWidth(null), img.getHeight(null));
        setPreferredSize(size);
        setMinimumSize(size);
        setMaximumSize(size);
        setSize(size);
        setLayout(null);
    }

    public void paintComponent(Graphics g) {
        g.drawImage(img, 0, 0, null);
    }
}

有关事件的更多信息，可以看看Oracle教程如何编写组件监听器。

You could create a custom JPanel which has a background image (the image you want). You can then use the JPanel's functionality to listen for click events. A custom JPanel could be something like so (taken from here):

class ImagePanel extends JPanel {

    private Image img;

    public ImagePanel(String img) {
        this(new ImageIcon(img).getImage());
    }

    public ImagePanel(Image img) {
        this.img = img;
        Dimension size = new Dimension(img.getWidth(null), img.getHeight(null));
        setPreferredSize(size);
        setMinimumSize(size);
        setMaximumSize(size);
        setSize(size);
        setLayout(null);
    }

    public void paintComponent(Graphics g) {
        g.drawImage(img, 0, 0, null);
    }
}

For more information on events, you can take a look at the Oracle tutorial How to Write a Component Listener.

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