库在Google App Engine上呈现定向图形（类似于graphviz） [英] Library to render Directed Graphs (similar to graphviz) on Google App Engine

问题描述

我正在寻找一个Java或Python库，可以将Dot语言中的图形呈现为图像文件。问题是我需要一个可以在Google App Engine上使用的库。基本上，我正在寻找一个库，可以将有向图的文本描述转换为图的图像。

例如：

隐藏这个边界列表：

  [A，B] 
 [B，C] 
 [A，C] 
 [C，D] 
  

：

我在这个例子中使用了 Graphviz ，但我知道这是不可能的使用Google App Engine。

/rel =noreferrer> Canviz 是您正在寻找的东西：它是一个用于将Graphviz图形绘制到Web浏览器画布的JavaScript库。它适用于大多数浏览器。

使用Canviz为您的Web应用程序在生成位图图像和图像映射到浏览器上方面具有优势：

• 服务器只需要Graphviz生成xdot文本;这比生成位图图像要快。


• 只有xdot文本需要传输到浏览器;这比二进制图像数据小，并且，如果浏览器支持它（大多数情况下），文本可以是gzip或bzip2压缩的。


• Web浏览器执行绘图，不是服务器;这可以减少服务器负载。


• 用户可以调整图表的大小，而无需涉及服务器;这比服务器绘制并以不同大小发送图形要快。

要查看它在行动中，看这里。

I am looking for a Java or Python library that can render graphs in the Dot language as image file. The problem is that I need a library that I can use on Google App Engine. Basically I am looking for a library that can convert the text description of a directed graph into an image of the graph.

For example:

Covert this edge list:

[A,B]
[B,C]
[A,C]
[C,D]

Into this image:

I used Graphviz for this example, but I know it is not possible for me to use it with Google App Engine.

解决方案

Canviz is what you are looking for: it is a JavaScript library for drawing Graphviz graphs to a web browser canvas. It works with most browsers.

Using Canviz has advantages for your web application over generating and sending bitmapped images and imagemaps to the browser:

• The server only needs to have Graphviz generate xdot text; this is faster than generating bitmapped images.
• Only the xdot text needs to be transferred to the browser; this is smaller than binary image data, and, if the browser supports it (which most do), the text can be gzip- or bzip2-compressed.
• The web browser performs the drawing, not the server; this reduces server load.
• The user can resize the graph without needing to involve the server; this is faster than having the server draw and send the graph in a different size.

To see it in action, look here.

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