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ng-vega's Introduction

ng-vega NPM version

Angular directive for rendering Vega specs. This project was forked and modified from angular-vega which was written for Vega 1 and became inactive. The current version of ng-vega supports Vega 2.

Demo

  • Simple demo -- Select dataset/renderer to see the chart changes and see the code to see how it was implemented.
  • Vega editor demo -- Implement Vega editor using ng-vega.

For more information about Vega, please refer to official documentation.

Usage

angular.module('exampleApp', ['ngVega'])
<div vega spec="spec" vega-data="testData" vega-renderer="'svg'" vega-on-parse="myCallback(view)"></div>
  • spec is $scope.spec in your controller.

  • vega-data (optional) can be used to pass dynamic data. In the example above, it is bound to $scope.testData. Data can be a function to modify the values (Vega 2 syntax) or raw values (and ng-vega will convert it to a function to make it work for you).

$scope.testData = {
  // function to modify dataset name "table"
  table: function(data){
    data.remove(function(d){return true;})
      insert([{a: 3}, {a: 4}])
  }
}

$scope.testData = {
  // raw values for dataset name "table"
  table: [{a: 1},{a: 2}]
}
  • vega-renderer (optional) can be used to set renderer ('canvas' or 'svg'). Don't forget the quote.

  • vega-on-parse (optional) can be used to get notified when spec is parsed and to receive a handle to the View Component that Vega has built for the corresponding chart. In the example above, this parameter is bound to $scope.myCallback.

$scope.myCallback = function(view) {
  // perform any work you need to do once the spec is parsed
  console.log('Vega spec has been parsed.');
  // make use of the View Component API as you wish
  view.on('click', function(event, item) {
    console.log('clicked on ' + JSON.stringify(item));
  });
};

Installation

bower install ng-vega --save

or

npm install ng-vega --save

Import into your project

Angular module ngVega will be available once you do one of the following:

Choice 1. Global

Adding this library via <script> tag is the simplest way.

<script src="path/to/angular.js"></script>
<script src="path/to/vega.js"></script>
<script src="path/to/ng-vega.min.js"></script>
Choice 2: AMD

If you use requirejs, this library support AMD out of the box.

require.config({
  paths: {
    angular:   'path/to/angular',
    vega:      'path/to/vega',
    'ng-vega': 'path/to/ng-vega'
  }
});
require(['ng-vega'], function() {
  // do something
});
Choice 3: node.js / browserify
require('ng-vega');

Author

Krist Wongsuphasawat / @kristw

Copyright (c) 2016 Krist Wongsuphasawat. MIT License

ng-vega's People

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ng-vega's Issues

Publish latest package.json to npm

The latest version of ng-vega published on npm has a dependency on Vega "~1.5.0". That version of Vega seemed to either require the use of node-gyp or had a dependency which did. For those of us who don't want to install Python 2 (and any other native module build dependenies) in order to get ng-vega through npm, it would be great if you could publish you latest package.json to npm.

Can't initate world map chart

I have the following configuration ($scope.spec) for a Vega world map chart

{
      width: 900,
      height: 500,
      autosize: 'none',    

      encode: {
        update: {
          fill: {signal: 'background'}
        }
      },
    
      signals: [
        {
          name: 'type',
          value: 'mercator'
        },
        { name: 'scale', value: 150 },
        { name: 'rotate0', value: 0 },
        { name: 'rotate1', value: 0 },
        { name: 'rotate2', value: 0 },
        { name: 'center0', value: 0 },
        { name: 'center1', value: 0 },
        { name: 'translate0', update: 'width / 2' },
        { name: 'translate1', update: 'height / 2' },
    
        { name: 'graticuleDash', value: 0 },
        { name: 'borderWidth', value: 1 },
        { name: 'background', value: '#acacac'
          },
        { name: 'invert', value: false }
      ],
    
      projections: [
        {
          name: 'projection',
          type: {signal: 'type'},
          scale: {signal: 'scale'},
          rotate: [
            {signal: 'rotate0'},
            {signal: 'rotate1'},
            {signal: 'rotate2'}
          ],
          center: [
            {signal: 'center0'},
            {signal: 'center1'}
          ],
          translate: [
            {signal: 'translate0'},
            {signal: 'translate1'}
          ]
        }
      ],
    
      data: [
        {
          name: 'world',
          url: '../../../chartsData/world-110m.json',
          format: {
            type: 'topojson',
            feature: 'countries'
          }
        }
      ],
    
      marks: [
        {
          type: 'shape',
          from: {data: 'world'},
          encode: {
            update: {
              strokeWidth: {signal: '+borderWidth'},
              stroke: {signal: "invert ? '#777': '#fff'"},
              fill: {signal: "invert ? '#fff': '#abcdef'"},
              zindex: {value: 0}
            },
            hover: {
              strokeWidth: {signal: '+borderWidth + 1'},
              stroke: {value: '#10ca5a'},
              zindex: {value: 1}
            }
          },
          transform: [
            { type: 'geoshape', projection: 'projection' }
          ]
        }
      ]
    }
  }

And when I create an instance of the chart, according to the example I have the following errors:
[Vega Err] PARSE DATA FAILED: world SyntaxError: Unexpected token < in JSON at position 0
[Vega Err] PARSE DATA FAILED: world SyntaxError: Unexpected token < in JSON at position 0

I've reviewed my JSON file, and seems like it's not being added to my configuration. I also even let the url property in blank and that error stills appearing.

How can I instantiate a world map chart, or what is missing on my configuration?

Thanks in advance.

Does it work with Vega 2?

I'm trying to get this working with the latest version of vega but I keep having issues. I then noticed all your examples are using Vega 1.5. Does this work with Vega 2?

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