Add models/maps_cities example

Author: mattpap

examples/src/main/scala/models/MapsCities.scala

@@ -0,0 +1,37 @@
+package io.continuum.bokeh
+package examples
+package models
+
+import sampledata.world_cities
+
+object MapsCities extends Example with Tools {
+    val x_range = Range1d(-160, 160)
+    val y_range = Range1d(-80, 80)
+
+    val map_options = new GMapOptions().lat(15).lng(0).zoom(2)
+
+    val plot = new GMapPlot()
+        .x_range(x_range)
+        .y_range(y_range)
+        .width(1000)
+        .height(500)
+        .map_options(map_options)
+        .title("Cities of the world with a population over 5,000 people.")
+        .webgl(true)
+        .tools(Pan|WheelZoom)
+
+    object source extends ColumnDataSource {
+        val lng = column(world_cities.map(_.lng))
+        val lat = column(world_cities.map(_.lat))
+    }
+
+    import source.{lng,lat}
+
+    val circle = new Circle().x(lng).y(lat).size(5)
+        .line_color().fill_color(Color.FireBrick).fill_alpha(0.2)
+    plot.addGlyph(source, circle)
+
+    val document = new Document(plot) /* TODO title="Google Maps - World cities Example"*/
+    val html = document.save("maps_cities.html", config.resources)
+    info(s"Wrote ${html.file}. Open ${html.url} in a web browser.")
+}

examples/src/test/scala/Examples.scala

@@ -94,6 +94,10 @@ class ExamplesSpec extends Specification with TerminationMatchers {
             models.Maps.main(argv) must not(throwA[Throwable])
         }
 
+        "run MapsCities" in {
+            models.MapsCities.main(argv) must not(throwA[Throwable])
+        }
+
         "run Prim" in {
             models.Prim.main(argv) must not(throwA[Throwable])
         }

sampledata/src/main/scala/WorldCities.scala

@@ -0,0 +1,12 @@
+package io.continuum.bokeh
+package sampledata
+
+object WorldCities extends CSVSampleData {
+    def load(): List[WorldCity] = {
+        loadRows("world_cities.csv").map {
+            case List(name, lat, lng) => WorldCity(name, lat.toDouble, lng.toDouble)
+        }
+    }
+}
+
+case class WorldCity(name: String, lat: Double, lng: Double)

sampledata/src/main/scala/package.scala

@@ -18,12 +18,13 @@ package io.continuum.bokeh {
     }
 
     package object sampledata {
-        val sprint = Sprint.load()
-        val autompg = AutoMPG.load()
-        val us_states = USStates.load()
-        val us_counties = USCounties.load()
-        val us_holidays = USHolidays.load()
-        val unemployment = Unemployment.load()
+        val autompg        = AutoMPG.load()
         val periodic_table = PeriodicTable.load()
+        val sprint         = Sprint.load()
+        val unemployment   = Unemployment.load()
+        val us_counties    = USCounties.load()
+        val us_holidays    = USHolidays.load()
+        val us_states      = USStates.load()
+        val world_cities   = WorldCities.load()
     }
 }