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studiomap.js
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studiomap.js
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//build choropleth layers in Studio rather than js for speed
var RISKLAYERS = ['east1', 'east2', 'east3', 'east4', 'east5', 'east6', 'south1', 'south2', 'south3', 'south4', 'south5', 'south6', 'midwest1', 'midwest2', 'midwest3', 'midwest4', 'midwest5', 'midwest6', 'west1', 'west2', 'west3', 'west4', 'west5', 'west6', 'counties1', 'counties2', 'counties3', 'counties4', 'counties5', 'counties6'];
var REGIONS = ['east', 'south', 'midwest', 'west']; //regions to add - saved in separate mapbox files due to upload limit
//URLS of regional datasets
var URLS = ['datakinddc.04hkadfo', 'datakinddc.2b90vyhy', 'datakinddc.b0ujw98l', 'datakinddc.cao4jei0'];
var COLORS = ["#fef0d9", "#fdd49e", "#fdbb84", "#fc8d59", "#e34a33", "#b30000"];
mapboxgl.accessToken = 'pk.eyJ1IjoiZGF0YWtpbmRkYyIsImEiOiJjaWppcmZtMHcwMnZ2dHlsdDlzenN0MnRqIn0.FsB8WZ_HKhb3mPa1MPXxdw';
//buttons for riskiest tract views
var topOpts = ["All", 10, 25, 50, 100, 200];
//make the radio buttons dynamically
function makebtns() {
var labels = d3.select("#statbtns").selectAll("label")
.data(topOpts)
.enter()
.append("label")
.attr("class", "button")
.attr("value", function (d) {
return d;
})
.text(function (d) {
return d;
})
.insert("input")
.attr({
type: "radio",
name: "outcome",
value: function (d) {
return d;
}
});
//Our default view is all the tracts, so give that button the "selected" class
d3.select('label[value="All"]')
.classed("selected", true);
};
function tooltips(layers) {
map.on("mousemove", function (e) {
var features = map.queryRenderedFeatures(e.point, {
radius: 1,
layers: layers
});
if (features.length > 0) {
//show name and value in sidebar
document.getElementById('tooltip-risk').innerHTML = Math.round(features[0].properties.risk);
document.getElementById('tooltip-rank').innerHTML = features[0].properties.rank + "/" + features[0].properties.rankn;
document.getElementById('tooltip-households').innerHTML = d3.format(",d")(features[0].properties.hoshlds);
document.getElementById('tooltip-income').innerHTML = d3.format("$,d")(features[0].properties.mdnnc_h);
if (features[0].properties.NAME != undefined) {
document.getElementById('tooltip-tract').innerHTML = "Tract " + features[0].properties.NAME;
}
document.getElementById('tooltip-name').innerHTML = features[0].properties.county + "<br />" + features[0].properties.chapter;
//for troubleshooting - show complete features info
// document.getElementById('tooltip-name').innerHTML = JSON.stringify(features, null, 2);
} else {
//if not hovering over a feature set tooltip to empty
document.getElementById('tooltip-risk').innerHTML = "";
document.getElementById('tooltip-rank').innerHTML = "";
document.getElementById('tooltip-households').innerHTML = "";
document.getElementById('tooltip-income').innerHTML = "";
document.getElementById('tooltip-tract').innerHTML = "";
document.getElementById('tooltip-name').innerHTML = "";
}
});
}
makebtns();
//create map zoomed in to DC
var map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/datakinddc/cijisuzms004z8wlxb9m6zh0y',
zoom: 4,
center: [-97, 38],
minZoom: 3,
preserveDrawingBuffer: true
});
// Add zoom and rotation controls to the map.
map.addControl(new mapboxgl.Navigation());
//disable scroll zooming to not interfere with the page
//map.scrollZoom.disable();
// Add geocoder
var geocoder = new mapboxgl.Geocoder({
container: 'geocoder-container'
});
map.addControl(geocoder);
map.on('style.load', function () {
//add layers for top rank filtering
//style the same as full map
for (r = 0; r < REGIONS.length; r++) {
map.addSource(REGIONS[r] + 'src', {
type: 'vector',
url: 'mapbox://' + URLS[r]
});
//add a border layer to be used on hover
map.addLayer({
id: REGIONS[r] + 'top',
type: 'fill',
source: REGIONS[r] + 'src',
'source-layer': REGIONS[r],
layout: {
visibility: 'visible'
},
paint: {
"fill-outline-color": {
"base": 0.1,
"stops": [
[
12,
"hsla(0, 0%, 0%, 0)"
],
[
13,
"hsl(0, 0%, 0%)"
]
]
},
'fill-color': {
property: 'riskgrp',
stops: [
[1, COLORS[0]],
[2, COLORS[1]],
[3, COLORS[2]],
[4, COLORS[3]],
[5, COLORS[4]],
[6, COLORS[5]]]
},
'fill-opacity': 0.5
},
//no tracts should match
filter: ['<', "rank", 0]
}, 'admin-2-boundaries');
}
tooltips(['east1', 'east2', 'east3', 'east4', 'east5', 'east6', 'south1', 'south2', 'south3', 'south4', 'south5', 'south6', 'midwest1', 'midwest2', 'midwest3', 'midwest4', 'midwest5', 'midwest6', 'west1', 'west2', 'west3', 'west4', 'west5', 'west6', 'counties1', 'counties2', 'counties3', 'counties4', 'counties5', 'counties6', 'easttop', 'southtop', 'midwesttop', 'westtop']);
map.addSource('single-point', {
"type": "geojson",
"data": {
"type": "FeatureCollection",
"features": []
}
});
map.addLayer({
"id": "point",
"source": "single-point",
"type": "circle",
"paint": {
"circle-radius": 15,
"circle-color": "#5e2f62"
}
});
// Listen for the `geocoder.input` event that is triggered when a user
// makes a selection and add a marker that matches the result.
geocoder.on('result', function (ev) {
console.log(ev.result.geometry);
map.getSource('single-point').setData(ev.result.geometry);
});
//remove the marker when the search bar is cleared
geocoder.on('clear', function (ev) {
console.log('removed')
map.getSource('single-point').setData({
"coordinates": [null, null],
"type": "Point"
});
});
});
//on clicking the buttons, turn the other layers off and view just the highest ranked N tracts in each region
$('#statbtns input:radio').click(function (e) {
//remove previous selected classes
d3.selectAll(".selected")
.classed("selected", false);
e.preventDefault();
e.stopPropagation();
var selected = $(this).val();
//apply selected class to selected button
d3.select('label[value="' + $(this).val() + '"]')
.classed("selected", true);
//turn on the main choropleth layers if choosing All
if (selected == "All") {
for (i = 1; i < 7; i++) {
map.setLayoutProperty('counties' + i, 'visibility', 'visible');
//loop over all regions (tract level)
for (r = 0; r < REGIONS.length; r++) {
map.setLayoutProperty(REGIONS[r] + i, 'visibility', 'visible');
}
}
//change filter
for (r = 0; r < REGIONS.length; r++) {
map.setFilter(REGIONS[r] + 'top', ['<', "rank", 0]);
}
} else {
//Only show top n tracts otherwise
var n = parseInt(selected);
//turn off the main layers
for (i = 1; i < 7; i++) {
map.setLayoutProperty('counties' + i, 'visibility', 'none');
//loop over all regions (tract level)
for (r = 0; r < REGIONS.length; r++) {
map.setLayoutProperty(REGIONS[r] + i, 'visibility', 'none');
}
}
//change filter to top n, based on rank attribute in data (ranked within Red Cross regions)
for (r = 0; r < REGIONS.length; r++) {
var filtertype = map.getFilter(REGIONS[r] + 'top');
map.setFilter(REGIONS[r] + 'top', ['all', ['<=', "rank", n], ['==', 'lowpop', 0]]);
}
}
});
$('#print').click(function () {
var printWindow = window.open();
var canvas = map.getCanvas();
printWindow.document.write('<img src="' + canvas.toDataURL() + '" style="width: 100%;">');
printWindow.print();
});
//function flies to tract in map when clicked in table
//not using due to change that shows table in pop-up div
function flyToTract(geoid) {
var tiles = [];
for (var r = 0; r < REGIONS.length; r++) {
var results = map.querySourceFeatures(REGIONS[r] + 'src', {
sourceLayer: [REGIONS[r]],
filter: ['==', 'GEOID', geoid]
});
if (results.length > 0) {
tiles = tiles.concat(results);
break;
}
}
var coords = [];
for (var t = 0; t < tiles.length; t++) {
coords = coords.concat(tiles[t].geometry.coordinates[0]);
}
var bounds = coords.reduce(function (bounds, coordinate) {
return {
sw: [Math.min(bounds.sw[0], coordinate[0]), Math.max(bounds.sw[1], coordinate[1])],
ne: [Math.max(bounds.ne[0], coordinate[0]), Math.min(bounds.ne[1], coordinate[1])]
};
}, {
sw: [coords[0][0], coords[0][1]],
ne: [coords[0][0], coords[0][1]]
});
var latLngBounds = new mapboxgl.LngLatBounds(new mapboxgl.LngLat(bounds.sw[0], bounds.sw[1]), new mapboxgl.LngLat(bounds.ne[0], bounds.ne[1]));
map.fitBounds(latLngBounds);
}