生成蜡染背景图像
我有一个生成字节数组的方法，它可以表示为二维图像。我想将此图像显示为蜡染中的背景图像。我不想将数组保存到磁盘（作为图像），然后将其加载到蜡染中。相反，我想将数组提供给蜡染。我虽然使用 ParsedURLData 可以帮助我，但我不知道如何让它工作。有什么建议吗？
我调用 ParsedURL.registerHandler(new MyProtocolHanlder("myprotocol")); ，并且 MyProtocolHanlder.parseURL 返回 MyParsedURLData 。
我以为返回我自己的流会起作用，但事实并非如此。在下面的示例中，我只是从磁盘加载图像并尝试显示它。
class MyParsedURLData extends ParsedURLData {
public MyParsedURLData() {
}
@Override
public InputStream openStreamRaw(String arg0, Iterator arg1) throws IOException {
return new File("some_image_here").toURI().toURL().openStream();
}
}
如果在 MyParsedURLData 的构造函数中我设置了 protocol = "file" 和 path="another_image"，那么无论怎样，都会加载另一个图像openStreamRaw 返回什么流。
有什么建议吗？
I have a method that generates an array of bytes, which can be represented as a two dimensional image. I would like to show this image as a background image in batik. I do not want to save the array to disk (as image) and then load it into batik. Instead I would like to provide the array to the batik. I though that using ParsedURLData can help me, but I can not figure out how to make it work. Any suggestions?
I call ParsedURL.registerHandler(new MyProtocolHanlder("myprotocol")); and MyProtocolHanlder.parseURL returns MyParsedURLData.
I thought that returning my own stream would work, but it does not. In the example bellow I simply load an image from disk and try to display it.
class MyParsedURLData extends ParsedURLData {
public MyParsedURLData() {
}
@Override
public InputStream openStreamRaw(String arg0, Iterator arg1) throws IOException {
return new File("some_image_here").toURI().toURL().openStream();
}
}
If in the constructor for MyParsedURLData I set protocol = "file" and path="another_image", then another image will be loaded, no matter what stream is returned by openStreamRaw.
Any suggestions?
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最简单的方法是将图像保存到临时文件中，然后只需通过 File.toURI().toURL() 引用它，Batik 就会加载它。为此，您不需要自定义协议处理程序或
ParsedURL。选择 Batik 支持的标准图像格式作为临时文件，例如PNG或JPEG！您可以通过实现
ParsedURLProtocolHandler和RegistryEntry来保存临时文件，并将它们注册到 Batik。网站上有一些关于这方面的文档，但仍然很痛苦。我花了几个小时才弄清楚（代码还没有真正准备好共享），但我现在可以将BufferedImage直接传递给 Batik，而无需将其编码为.png或类似的文件先。The simplest way is to save the image to a temp file, then just reference it via
File.toURI().toURL(), and Batik will load it. You don't need a custom protocol handler orParsedURLfor this. Choose a standard image format supported by Batik such asPNGorJPEGfor the temp file!You can save the temp file by implementing both a
ParsedURLProtocolHandlerand aRegistryEntryand register them with Batik. There is a little bit of documentation on that on the web site, but it is still a pain to do. Took me some hours to figure out (and the code is not really ready for sharing), but I can now pass aBufferedImagedirectly to Batik without encoding it as a.pngor similar file first.