nvd3-stacked-area.html

<link rel="import" href="../polymer/polymer.html">
<link rel="import" href="nvd3-behavior.html">

<!--
An element to create stacked area chart using nvd3.

Example:

    <nvd3-stacked-area
    data="[[data]]"
    height="100"
    width="400"
    auto-resize
    show-legend
    use-interactive-guideline></nvd3-stacked-area>

Data Format:
```
[
  {
    "key": "North America",
    "values": [
      [1, 23.041422681023],
      [2, 19.854291255832],
      [3, 21.02286281168],
      [4, 22.093608385173]
    ]
  },

  {
    "key": "Africa",
    "values": [
      [1, 7.9356392949025],
      [2, 7.4514668527298],
      [3, 7.9085410566608],
      [4, 5.8996782364764]
    ]
  },

  {
    "key": "South America",
    "values": [
      [1, 7.9149900245423],
      [2, 7.0899888751059],
      [3, 7.5996132380614],
      [4, 8.2741174301034]
    ]
  }
]
```

@group NVD3 Elements
@element nvd3-stacked-area
@demo demo/nvd3-stacked-area.html
@hero hero.svg
-->

<dom-module id="nvd3-stacked-area">
  <template>
     <style include="nvd3-shared-styles">
     </style>
    <!-- We need to put svg tag inside a div to set correct margins -->
    <div>
      <svg id="svg"></svg>
    </div>
  </template>

  <script>
    Polymer({
      is: 'nvd3-stacked-area',
      behaviors: [NVD3.ChartBehavior],
      properties: {
        /**
         * NVD3 chart object.
         */
        _chart: {
          type: Object,
          value: function() {
            return nv.models.stackedAreaChart()
              .x(function(d) {
                return d[0]
              })
              .y(function(d) {
                return d[1]
              });
          }
        },

        /**
         * Whether to display the legend or not
         */
        showLegend: {
          type: Boolean,
          value: false
        },

        /**
         * Sets the chart to use a guideline and floating tooltip instead of
         * requiring the user to hover over specific hotspots.
         */
        useInteractiveGuideline: {
          type: Boolean,
          value: false
        },

        /**
         * Custom Labels for x axis.
         * e.g. {
         *     "0": "Label 0",
         *     "1": "Label 1",
         *     "2": "Label 2",
         *     "3": "Label 3",
         *     "4": "Label 4"
         *   }
         */
        xAxisLabels: {
          type: Object,
          value: {},
          observer: '_xAxisLabelsChanged'
        },

        /**
         * NVD3 components which are used in this chart.
         * It's required for binding events.
         */
        _components: {
          type: Array,
          value: ['stacked', 'legend', 'controls', 'xAxis', 'x2Axis', 'yAxis', 'y2Axis', 'tooltip', 'focus']
        }
      },

      /**
       * Check if custom labels is set and update tickFormat of x axis.
       *
       * @private
       */
      _xAxisLabelsChanged: function() {
        var xAxisLabels = this.xAxisLabels;

        this._chart.xAxis.tickFormat(function(d) {
          if (xAxisLabels.hasOwnProperty(d)) {
            return xAxisLabels[d];
          } else {
            return d;
          }
        });
      }
    });
  </script>
</dom-module>