hegel

hegel is a Data Visualization Service written by node.js and d3.js. It renders png image when you post data to server.

todo:

• 多线条绘图接口
• 美化现有line chart图
• 坐标可增加轴标题
• 自定义纵横坐标轴接口
• 增加折线图、饼状图、柱形图接口

how to use

1. git clone git@github.com:ubear/hegel.git
2. install node.js
3. cd hegel & npm install
4. node server.js > log.txtor nodejs server.js > log.txt

post data

The default address is localhost:3000, then post data to the localhost:3000/render/, and get png picture from localhost:3000/png/filename.png or get svg picture from localhost:3000/svg/filename.svg.

The data format is json and the params is as follow:

{
  "width": "400",
  "height": "200",
  "units": "%", 
  "stokeColor": "green",
  "stokeWidth": 2,
  "filename": "percentage.png",
  "data":[[1445749500.0, 100.0], 
          [1445749800.0, 100.0], 
          [1445750100.0, 100.0], 
          [1445750400.0, 100.0], 
          [1445750700.0, 100.0],
          [1445751000.0, 100.0]
        ]
}

result

The png image is like this: