9-patch像Java的图像缩放？

Question

我不确定这是否是正确的问题,但我想知道在Android上是否有类似9个补丁图像,但对于Java,如Oracle,PC java.我所有的谷歌搜索只显示android,因为人们称之为Java,但它并不是真的相同.

我已经找到了LibGdx,但对于我正在寻找的单一九补丁能力来说,这是非常沉重的.

九个补丁图像是具有"9"区域的图像,通常在侧壁和中心区域伸展以适合屏幕时"拐角"不"缩放".Android的一个例子:http://developer.android.com/tools/help/draw9patch.html

有谁知道任何可以像这样扩展的东西？我需要能够支持PNG的东西.

Answer 1

如果您正在寻找在 Java 组件上使用 9 补丁图像的方法，我在这里问了同样的问题：How use a 9-patch image as background on a JPanel? 简而言之，答案是否定的，你不能。

长一点的是：如果您将图像分割为 9 个图像（边框、角和中心）并创建一个组件，该组件在重新绘制时会移动图像并调整图像大小，则可以。

以下示例适用于我的情况：

• 该组件是一个 JPanel。
• 面板的中心必须是透明的，所以我需要少一张图像。
• 该组件不会小于给定的图像。
• 图像具有透明度，这解释了代码中的 setOpaque(false) 调用。
• 该代码是一个草稿。

这里是代码：

public class NinePatchLikePanel extends JPanel{
private JPanel corner_top_l;
private JPanel corner_top_r;
private JPanel corner_bot_l;
private JPanel corner_bot_r;

private JPanel border_ver_l;
private JPanel border_ver_r;
private JPanel border_hoz_t;
private JPanel border_hoz_b;

private int min_width, min_height;

private int corners_width;
private int corners_height;
private int borders_width;
private int borders_height;


public NinePatchLikePanel (String[] urls) {

    if(urls.length != 8) {
        throw new UnsupportedOperationException("Exception to be managed!");
    } else {
        corner_top_l = new JPanelWithBackground (urls [0]);
        corner_top_r = new JPanelWithBackground (urls [1]);
        corner_bot_r = new JPanelWithBackground (urls [2]);
        corner_bot_l = new JPanelWithBackground (urls [3]);

        border_hoz_t = new JPanelWithBackground (urls [4]);
        border_ver_r = new JPanelWithBackground (urls [5]);
        border_hoz_b = new JPanelWithBackground (urls [6]);
        border_ver_l = new JPanelWithBackground (urls [7]);

        corners_width   = corner_top_l.getWidth();
        corners_height  = corner_top_l.getHeight();

        borders_width   = border_hoz_t.getWidth();  
        borders_height  = border_ver_l.getHeight();

        min_width   = 2 * corners_width  + borders_width;
        min_height  = 2 * corners_height + borders_height;

        this.setSize (min_width, min_height );
        this.setMinimumSize ( new Dimension (min_width, min_height) );
        this.setOpaque(false);
        this.setLayout(null);
        this.add(corner_top_l);
        this.add(corner_top_r);
        this.add(corner_bot_l);
        this.add(corner_bot_r);

        this.add(border_hoz_t);
        this.add(border_ver_r);
        this.add(border_hoz_b);
        this.add(border_ver_l);
    }
}

@Override
public void paintComponent(Graphics g)  {
    super.paintComponent(g);

    int actual_width = this.getWidth();
    int actual_height = this.getHeight();

    int _x = actual_width - corners_width;
    int _y = actual_height - corners_height;

    corner_top_l.setLocation(0, 0);
    corner_top_r.setLocation(_x, 0);
    corner_bot_l.setLocation(0, _y);
    corner_bot_r.setLocation(_x, _y);

    int new_borders_width  = _x - corners_width;
    int new_borders_height = _y - corners_height;


    border_hoz_t.setLocation(corners_width, 0);
    border_hoz_t.setSize(new_borders_width, border_hoz_t.getHeight());

    border_ver_r.setLocation(_x, corners_height);
    border_ver_r.setSize(border_ver_r.getWidth(), new_borders_height);

    border_hoz_b.setLocation(corners_width, _y);
    border_hoz_b.setSize(new_borders_width, border_hoz_b.getHeight());

    border_ver_l.setLocation(0, corners_height);
    border_ver_l.setSize(border_ver_l.getWidth(), new_borders_height);
}

}

这里是 JPanelWithBackground 类的代码：

public class JPanelWithBackground extends JPanel { 
Image bg = null; 

public JPanelWithBackground(String url) { 
    try{
        bg = ImageIO.read(getClass().getResourceAsStream(url));
        int height = bg.getHeight(null);
        int width  = bg.getWidth(null);
        Dimension d = new Dimension(width,height);
        this.setSize (width, height);
        this.setMinimumSize ( d );
        this.setOpaque(false); 
    } catch (IOException ex) {
        //TODO: Manage this exception in a better way
            System.err.println(ex);
            System.exit(1);
    }  
} 

@Override
public void paintComponent(Graphics g) { 
    super.paintComponent(g);
    if (bg != null)
        g.drawImage(bg, 0, 0, this.getWidth(), this.getHeight(), null);
}
}