专用拉丝表面的Java？ [英] Dedicated drawing surface in Java?

问题描述

我想要做高效的2D工程图中的Java。我想有某种表面，我可以自由绘制，而不必让视图层次遍历和更新，这可能会导致口吃。

I want to do efficient 2D drawing in Java. I would like to have some kind of surface which I may draw freely without having to let the view hierarchy traverse and update, which may cause stutter.

我已经使用一个JPanel在第一，被称为重绘（），但我觉得它不是最优（而这是我问的原因）。我合作过的最接近的是Android的 SurfaceView ，这让我专用的绘图表面。

I have used a JPanel at first and called repaint() but I find it not to be optimal (and it is the reason I ask). The closest thing I have worked with is the Android's SurfaceView and it gives me a dedicated drawing surface.

要实现这一专用绘图表面，是否需要使用OpenGL或有任何等效 SurfaceView ？

To achieve this dedicated drawing surface, do I need to use OpenGL or is there any equivalent SurfaceView?

推荐答案

如果你不需要图形加速，你可以画到的BufferedImage 与的Graphics2D 。一旦你有你的数据在的BufferedImage ，你可以简单地画的的BufferedImage 上的组件。这将避免任何形式的闪烁你正在谈论的。

If you don't need Accelerated Graphics, you can draw onto a BufferedImage with Graphics2D. Once you have your data in the BufferedImage, you can simply paint the BufferedImage onto the component. This will avoid any sort of flickering you are talking about.

创建的BufferedImage很简单：

Creating the BufferedImage is easy:

int w = 800;
int h = 600;
BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);

然后就可以绘制对象到它与一个图形上下文（可能在你自己的渲染功能）：

Then you can draw objects onto it with a graphics context (Possibly in your own render function):

Graphics2D g = bi.createGraphics();
g.drawImage(img, 0, 0, null);
//img could be your sprites, or whatever you'd like
g.dipose();//Courtesy of MadProgrammer
//You own this graphics context, therefore you should dispose of it.

然后，当你重新绘制你的组件，你画的BufferedImage到它作为一件：

Then when you repaint your component, you draw the BufferedImage onto it as one piece:

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

它有点像用BufferedImage，作为一个后台缓冲区，然后一旦你完成绘制到它，你粉刷到组件。

Its sort of like using BufferedImage as a back buffer, and then once you are done drawing to it, you repaint it onto the component.

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