mtc-samples/mapbox-test.html at gh-pages · LocalData/mtc-samples · GitHub

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<!DOCTYPE html>
<html>
<head>
    <meta charset='utf-8' />
    <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
    <script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.20.1/mapbox-gl.js'></script>
    <link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.20.1/mapbox-gl.css' rel='stylesheet' />
    <style>
        body { margin:0; padding:0; }
        #map { position:absolute; top:0; bottom:10%; width:90%; }
    </style>
</head>
<body>
<style>
.map-overlay {
    font: 12px/20px 'Helvetica Neue', Arial, Helvetica, sans-serif;
    position: absolute;
    width: 25%;
    top: 0;
    left: 0;
    padding: 10px;
}

.map-overlay .map-overlay-inner {
    background-color: #fff;
    box-shadow:0 1px 2px rgba(0, 0, 0, 0.20);
    border-radius: 3px;
    padding: 10px;
    margin-bottom: 10px;
}

.map-overlay h2 {
    line-height: 24px;
    display: block;
    margin: 0 0 10px;
}

.map-overlay .legend .bar {
    height: 10px;
    display: inline-block;
}

.map-overlay input {
    background-color: transparent;
    display: inline-block;
    width: 100%;
    position: relative;
    margin: 0;
    cursor: ew-resize;
}
</style>

<div id='map'></div>

<div class='map-overlay top'>
    <div class='map-overlay-inner'>
        <h2>Speed Traveled by Time</h2>
        <label id='hour'></label>
        <input id='slider' type='range' min='0' max='24' step='1' value='12' />
    </div>
    <div class='map-overlay-inner'>
        <div id='legend' class='legend'>
            <div>Speed (mph)</div>
        </div>
    </div>
</div>

<script>
/**
 * Prototyping congestion/speed data with Mapbox GL as alternative to CartoDB
 *
 * Reference examples:
 * https://www.mapbox.com/mapbox-gl-js/example/data-driven-circle-colors/
 * https://www.mapbox.com/mapbox-gl-js/example/timeline-animation/
 * https://ryanbaumann.squarespace.com/blog/2016/1/23/mapbox-gl-create-data-driven-styles
 */

// public key per mapbox account
mapboxgl.accessToken = 'pk.eyJ1IjoiamVzc2ljYW1jaW5jaGFrIiwiYSI6ImNpcTB4Y2h2ODAwa3BmaG5uYW0xOHBlOGoifQ.VSD_IOgj6S1oVmrSamgZvw';

// draw map
var map = new mapboxgl.Map({
    container: 'map', // container id
    style: 'mapbox://styles/mapbox/streets-v9', //stylesheet location
    center: [-122.4, 37.8], // starting position - longfrancisco
    zoom: 8 // starting zoom
});

// draw slider and legend
var hourLabel = document.getElementById('hour');
var legend = document.getElementById('legend');

// set global vars for filtering and coloring speed data
var breaks = [25, 35, 50, 60, 61];
var colors = ['#ec7429', '#ea9e77', '#d9b305', '#9dbf88', '#62a60a'];
var layers = [];
var filters = [];

// calculate speed ranges
// logic: is speed value <= 25, > 25 and <= 35 etc or >= 61
function getSpeedRanges(breaks, param) {
    filters = [];
    for (var p = 0; p < breaks.length; p++) {
        if (p <= 0) {
            filters.push([ 'all',
                [ '<=', param, breaks[p] ]
            ])
        } else if (p < breaks.length - 1) {
            filters.push([ 'all',
                [ '>', param, breaks[p -1] ],
                [ '<=', param, breaks[p] ]
            ])
        } else {
            filters.push([ 'all',
                [ '>=', param, breaks[p] ]
            ])
        }
    }
}

// create map layer with speed ranges
function getSpeedLayers(filters, colors) {
    layers = [];
    for (var p = 0; p < breaks.length; p++) {
        layers.push({
            id: 'points-' + p,
            type: 'line',
            source: 'speed-merged',
            paint: {
                "line-color": colors[p]
            },
            filter: filters[p]
        })
    }
}

// load and process the map data
map.on('style.load', function() {
    map.addSource("speed-merged", {
        "type": "geojson",
        // use cartodb sql api call, change default json format to geojson
        "data": "https://mtc.cartodb.com:443/api/v2/sql?format=GeoJSON&q=SELECT * FROM public.speed_data_merged"
    });

    // add zoom and rotation controls
    map.addControl(new mapboxgl.Navigation());

    // add layer of all data, color by travel speed categories
    map.addLayer({
        "id": "speed-merged",
        "type": "line",
        "source": "speed-merged",
        "layout": {
            "line-join": "round",
            "line-cap": "round"
        },
        "paint": {
            "line-width": 2
            // "line-color": {
            //     "property": "speed",
            //     "type": "categorical",
            //     // need to calculate ranges for speed categories
            //     "stops": [
            //         [filters[0], '#ec7429'],
            //         [filters[1], '#ea9e77'],
            //         [filters[2], '#d9b305'],
            //         [filters[3], '#9dbf88'],
            //         [filters[4], '#62a60a']
            //     ]
            // }
        }
    });

    getSpeedRanges(breaks, 'speed'); // get the ranges based on data param
    getSpeedLayers(filters, colors); //

});
</script>

</body>
</html>