Merge pull request #27 from sul-dlss/custom-colors

add ability to pass through color ramp from CatalogController configu…

app/assets/javascripts/blacklight_heatmaps/viewers/index.js

@@ -18,6 +18,7 @@ Blacklight.onLoad(function () {
       var requestUrl = $el.data().searchUrl + '&format=json';
       var geometryField = $el.data().geometryField;
       var template = $el.data().sidebarTemplate;
+      var colorRamp = $el.data().colorRamp;
 
       var map = L.map($el[0].id).setView([0, 0], 1);
       var basemap = L.tileLayer($el.data().basemap, {
@@ -27,6 +28,7 @@ Blacklight.onLoad(function () {
       var solrLayer = L.solrHeatmap(requestUrl, {
         field: geometryField,
         maxSampleSize: 50,
+        colors: colorRamp,
       }).addTo(map);
 
       var sidebar = L.control.sidebar('index-map-sidebar', {

app/helpers/blacklight/maps_helper.rb

@@ -51,7 +51,8 @@ def index_map_data_attributes
         basemap: blacklight_config.basemap,
         search_url: request.url,
         geometry_field: blacklight_config.geometry_field,
-        sidebar_template: sidebar_template
+        sidebar_template: sidebar_template,
+        color_ramp: blacklight_config.view.heatmaps.color_ramp
       }
     end
   end

lib/generators/blacklight_heatmaps/install_generator.rb

@@ -20,6 +20,8 @@ def configuration
         "\n    config.basemap = 'http://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png'" \
         "\n    config.show.partials.insert(1, :show_leaflet_map)" \
         "\n    config.view.heatmaps.partials = []" \
+        "\n    #Heatmap color ramp. For best results, use http://colorbrewer2.org or http://tristen.ca/hcl-picker/#/hlc/5/1" \
+        "\n    config.view.heatmaps.color_ramp = ['#ffffcc', '#a1dab4', '#41b6c4', '#2c7fb8', '#253494']" \
         "\n"
       end
     end

spec/helpers/blacklight/maps_helper_spec.rb

@@ -26,6 +26,7 @@
       expect(helper.index_map_div)
         .to have_css '[data-basemap="http://www.example.com/{z}/{x}/{y}.png"]'
       expect(helper.index_map_div).to have_css '[data-sidebar-template]'
+      expect(helper.index_map_div).to have_css '[data-color-ramp]'
     end
   end
   describe '#sidebar_template' do