L = require('leaflet@1.2.0')
html`<link href='${resolve('leaflet@1.2.0/dist/leaflet.css')}' rel='stylesheet' />`
ElectoralDistricts = FileAttachment("feds.json").json()
Edist = FileAttachment("fed.json").json()
map = {
// You'll often see Leaflet examples initializing a map like L.map('map'),
// which tells the library to look for a div with the id 'map' on the page.
// In Observable, we instead create a div from scratch in this cell (called "map")
let container = DOM.element('div', { style: `width:${width}px;height:${width/1.6}px` });
// This component utilizes "yield" which pauses the execution of this code block
// returns the value of container back to the notebook which allows the
// div to be placed on the page. This is important, because Leaflet uses
// the div's .offsetWidth and .offsetHeight (used to get current size of the div)
// to size the map. If I were to only return the container at the end of this method,
// Leaflet might get the wrong idea about the map's size.
yield container;
// Now we create a map object and add a layer to it.
let map = L.map(container).setView([49.2527, -123.1207], 11.5); // initializes the map, sets zoom & coordinates
let osmLayer = L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
attribution: '© <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map); //This adds the tile layer to the map. The map dynamically loads tiles based on current view the experience smooth and seamless. Make sure to add attribution to your map. osm = open street map. L = layer
}
map2 = {
let container = DOM.element ('div', { style: `width:${width}px;height:${width/1.6}px` });
yield container;
let map = L.map(container).setView([49.234369, -123.010985], 13.5); // initializes the map, sets zoom & coordinates
let osmLayer = L.tileLayer('https://stamen-tiles-{s}.a.ssl.fastly.net/toner/{z}/{x}/{y}{r}.{ext}', {
attribution: 'Map tiles by <a href="http://stamen.com">Stamen Design</a>, <a href="http://creativecommons.org/licenses/by/3.0">CC BY 3.0</a> — Map data © <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors',
subdomains: 'abcd',
minZoom: 0,
maxZoom: 20,
ext: 'png'
}).addTo(map);
}
VanAreas = FileAttachment("VancouverAreaSize.json").json()
VanAreasMap = {
let container = DOM.element('div', { style: `width:${width}px;height:${width/1.6}px` });
yield container;
let map = L.map(container);
let osmLayer = L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
attribution: '© <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);
let VanAreasLayer = L.geoJson(VanAreas, {
weight: 5,
color: "#432",
}).bindPopup(function (Layer) {
return Layer.feature.properties.NAME;
}).addTo(map);
map.fitBounds(VanAreasLayer.getBounds());
}
map3 = {
let container = DOM.element ('div', { style: `width:${width}px;height:${width/1.6}px` });
yield container;
let map = L.map(container); // initializes the map, sets zoom & coordinates
let osmLayer = L.tileLayer('https://stamen-tiles-{s}.a.ssl.fastly.net/toner/{z}/{x}/{y}{r}.{ext}', {
attribution: 'Map tiles by <a href="http://stamen.com">Stamen Design</a>, <a href="http://creativecommons.org/licenses/by/3.0">CC BY 3.0</a> — Map data © <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors',
subdomains: 'abcd',
minZoom: 0,
maxZoom: 20,
ext: 'png'
}).addTo(map);
let EdistLayer = L.geoJson(Edist, {
weight: 2,
color: "#F00",
}).bindPopup(function (Layer) {
return Layer.feature.properties.FEDNAME;
}).addTo(map);
map.fitBounds(EdistLayer.getBounds());
}
Dots = {
const width = 600;
const height = 400;
const svg = d3.select(DOM.svg(width, height))
const projection = d3.geoMercator().fitExtent([[50,50], [width-50, height-50]], Wcities);
const points = svg.selectAll('circle')
.data(Wcities.features)
.join('circle')
.attr('fill', 'blue')
.attr('cx', d => projection(d.geometry.coordinates)[0])
.attr('cy', d => projection(d.geometry.coordinates)[1])
.attr('r', 10)
.on('mouseover', function() {
d3.select(this).transition()
.duration('150')
.attr('fill', 'red')
.attr('r', '15')
})
.on('mouseout', function() {
d3.select(this).transition()
.duration('300')
.attr('fill', 'blue')
.attr('r', '10')
})
const text = svg.selectAll('text')
.data(Wcities.features)
.join('text')
.attr('font-size','9')
.attr('x', d => projection(d.geometry.coordinates)[0]+15)
.attr('y', d => projection(d.geometry.coordinates)[1]+3)
.text(d => d.properties.Name)
return svg.node()
}
WesternCanadianCities = {
let container = DOM.element('div', { style: `width:${width}px;height:${width/1.6}px` });
yield container;
let map = L.map(container).fitBounds(L.geoJson(Wcities).getBounds());
let osmLayer = L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
attribution: '© <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);
}
D3VanAreasMap = {
let container = DOM.element('div', { style: `width:${width}px;height:${width/1.6}px` });
yield container;
let map = L.map(container).setView([49.2527, -123.1207], 11.5);
let osmLayer = L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
attribution: '© <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);
//initialize svg to add to map
L.svg().addTo(map)
//Create selection using D3
const overlay = d3.select(map.getPanes().overlayPane)
const svg = overlay.select('svg')
// create a group that is hidden during zooming
const g = svg.append('g').attr('class', 'leaflet-zoom-hide')
// Use Leaflets projection API for drawing svg path (creates a stream of projected points)
const projectPoint = function(x, y) {
const point = map.latLngToLayerPoint(new L.LatLng(y, x))
this.stream.point(point.x, point.y)
}
// Use d3's custom geo transform method to implement the above
const projection = d3.geoTransform({point: projectPoint})
// creates geopath from projected points (SVG)
const pathCreator = d3.geoPath().projection(projection)
const areaPaths = g.selectAll('path')
.data(VanAreas.features)
.enter()
.append('path')
.attr('fill-opacity', 0.3)
.attr('stroke', 'black')
.attr('stroke-width', 2.5)
// Function to place svg based on zoom
const onZoom = () => areaPaths.attr('d', pathCreator)
// initialize positioning
onZoom()
// reset whenever map is moved
map.on('zoomend', onZoom)
}
VegaLite = require('vega-embed@6')
fedUnemployment = d3.csv("https://gist.githubusercontent.com/mbarison/8ab5b4ef36ade1c6cfd05fb2a680d8f0/raw/4a54f7934ceab051a61fda996c8d58da72693fb8/canada_fed_unemp.csv")
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