问题描述
我试图创建一个不可见AWT组件的图像（屏幕截图）。我不能使用机器人班'屏幕捕获功能，因为该组件不显示在屏幕上。尝试使用下面的code：
I'm trying to create an image (screen-shot) of a non-visible AWT component. I can't use the Robot classes' screen capture functionality because the component is not visible on the screen. Trying to use the following code:
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = image.createGraphics();
component.paintAll(g);
有时可行，但是如果组件包含的东西，如一个文本框或按钮，或某种的OpenGL / 3D组件不工作（这些东西都排除在外的形象！）。我怎么可以把整个事情的一个适当的截图？
Works sometimes, but does not work if the component contains things such as a text box or button, or some sort of OpenGL / 3D component (these things are left out of the image!). How can I take a proper screenshot of the whole thing?
推荐答案
非常好的问题，我想过这个自己不时！
Excellent question, I've thought about this myself from time to time!
正如你已经写了，那撕心裂肺的重量重的组件，如3D和AWT到图像是一个大问题。这些组件是（几乎）的直接传送到显卡所以它们不能被重新绘制到使用正常的的paintComponent 的东西的图片，你需要从手术系统的帮助，或做你自己的这些组件的渲染。
As you already have written, that rending heavy weight components such as 3D and AWT onto an image is a big problem. These components are (almost) directly transferred to the graphic card so they cannot be re-rendered to an image using the normal paintComponent stuff, you need help from the operative system or doing your own rendering of these components.
有关不具有每个组件图像渲染的方法，你需要创建自己的。例如使用你可以使用这个的（的）。
For each component that does not have a to image rendering method you need to create your own. For example using jogl you can take a off-screen screenshot using this method (SO post).
prerequisites：
Prerequisites:
- 您可以启动程序/在无头环境的组成部分？
- 您使用Linux呢？
然后你可以使用渲染整个项目到一个虚拟屏幕，然后采取了从像这样的虚拟屏幕截图：
Then you can use Xvfb to render the whole program onto a virtual screen and then taking a screenshot from that virtual screen like this:
Xvfb :1 &
DISPLAY=:1 java YourMainClass
xwd -display :1 -root -out image.xwd
也许你需要通过传递要呈现给它的程序的大小tweek的Xvfb一点点（ 0 -screen 1024x768x24 ）。
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