Canada Map Widget for Dashing

README.md

##Preview

Description

Dashing widget to display geo points in Canada. This widget is designed as a general purpose map for any api that returns latitude and longitude data.

##Dependencies

Move topojson.v1.min.js to /assets/javascripts and ca.topojson to the /public directory so D3 can load the map data.

##Usage

To use this widget, copy camap.html, camap.coffee, and camap.scss into the /widgets/camap directory.

You will have to create a custom job to populate the geo point data. The JSON data follows this format

{
  "points": [
    {
      "id": 12345,
      "lat": 35,
      "lon": -70,
      "type": "red"
    },
    {
      "id": 678910,
      "lat": 35,
      "lon": -70,
      "type": "green"
    }
  ]
}

Each point must have a unique id, so it can be properly added and removed by d3. The type field is optional and will be appended as a class to the svg circle. By default all points are blue and there are CSS classes for red and green.

To include the widget in a dashboard, add the following snippet to the dashboard layout file:

<li data-row="1" data-col="1" data-sizex="3" data-sizey="2">
  <div data-id="camap" data-view="Camap" data-title="Flickr Activity"></div>
</li>

Visit this page for a demo of the map connected to the Flickr api.

ca.topojson

camap.coffee

class Dashing.Camap extends Dashing.Widget



  ready: ->
    container = $(@node).parent()

    width = (Dashing.widget_base_dimensions[0] * container.data("sizex")) + Dashing.widget_margins[0] * 2 * (container.data("sizex") - 1)
    height = (Dashing.widget_base_dimensions[1] * container.data("sizey"))

    # projection = d3.geo.albers()
    #   .scale(200)
    #   .translate([width / 2, height / 2 - 10])

    projection = d3.geo.azimuthalEqualArea()
      .rotate([100, -45])
      .center([5, 19])
      .scale(Math.min(width*1.1, height*1.2))
      .translate([width/2, height/2])

    path = d3.geo.path()
      .projection(projection)

    #create base svg object
    svg = d3.select(@node).append("svg")
      .attr("width", width)
      .attr("height", height)

    #add background
    svg.append("rect")
      .attr("class", "background")
      .attr("width", width)
      .attr("height", height)

    g = svg.append("g")

    #load map json
    d3.json("/ca.topojson", (error, ca) ->
      #add province outlines
      g.append("g")
          .attr("id", "provinces")
        .selectAll("path")
          .data(topojson.feature(ca, ca.objects.provinces).features)
        .enter().append("path")
          .attr("d", path)

      #add province borders
      g.append("path")
          .datum(topojson.mesh(ca, ca.objects.provinces, (a, b) -> a != b ))
          .attr("id", "province-borders")
          .attr("d", path)
    )



  onData: (data) ->
    if (Dashing.widget_base_dimensions)
      container = $(@node).parent()

      width = (Dashing.widget_base_dimensions[0] * container.data("sizex")) + Dashing.widget_margins[0] * 2 * (container.data("sizex") - 1)
      height = (Dashing.widget_base_dimensions[1] * container.data("sizey"))

      projection = d3.geo.azimuthalEqualArea()
        .rotate([100, -45])
        .center([5, 19])
        .scale(Math.min(width*1.1, height*1.2))
        .translate([width/2, height/2])


      #on each update grab the existing svg node
      svg = d3.select(@node).select('svg')

      #select all the points on the map and merge with current data
      circle = svg.selectAll("circle")
        .data(data.points, (d) -> d.id )

      #for each new point, add a svg circle
      #I've left commented code to animate and base the circle radius on an optional size parameter
      circle.enter().append("circle")
        # .attr("r", (d) -> if d.size then 5 + parseInt(d.size,10)/(100*1024*1024) else 5)
        .attr('r', Math.min(.008*width, 5))
        .attr("class", (d) -> "point" + if d.type then ' '+d.type else '')
        .attr("transform", (d) -> "translate(" + projection([d.lon,d.lat]) + ")" )
        # .transition()
        #   .duration(1000)
        #   .attr('r', 5)
        # .transition()
        #   .delay(1000)
        #   .duration(30000)
        #   .style('opacity', .4)

      #remove points no longer in data set
      circle.exit().remove()

      #reorder points based on id
      #if new points will always have higher ids than existing points, this may not be necessary
      circle.order()

camap.html

<p class="title" data-bind="title"></p>

<p class="updated-at" data-bind="updatedAtMessage"></p>

camap.scss

// ----------------------------------------------------------------------------
// Sass declarations
// ----------------------------------------------------------------------------
$background-color:  #fff;

// ----------------------------------------------------------------------------
// Widget-camap styles
// ----------------------------------------------------------------------------
.widget-camap {

  background-color: $background-color;

  .title {
    color: #000;
    position: absolute;
    width: 100%;
    text-align: center;
    left: 0;
    top: 10px;
  }

  svg {
    position: absolute;
    left: 0;
    top: 0;
  }

  .updated-at {
    color: #000
  }
  .background {
    fill: none;
    pointer-events: all;
  }

  #provinces {
    fill: #ddd;
  }

  #province-borders {
    fill: none;
    stroke: #fff;
    stroke-width: 1.5px;
    stroke-linejoin: round;
    stroke-linecap: round;
    pointer-events: none;
  }

  .point {
    fill: #1221ec;
    stroke: #ffffff;
    // opacity: 0.40;
  }

  .red {
    fill: #c90d0d;
  }

  .green {
    fill: #0dc92c;
  }

}

LICENSE.md

The MIT License (MIT)

Copyright (c) 2014 Josh Runge, Aquto

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

sample.png

topojson.v1.min.js

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