tfl_app/mapbox_test.html at master · julioeq29/tfl_app · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Animate a point along a route</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v2.13.0/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v2.13.0/mapbox-gl.js"></script>
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<style>
.overlay {
position: absolute;
top: 10px;
left: 10px;
}

.overlay button {
font: 600 12px/20px 'Helvetica Neue', Arial, Helvetica, sans-serif;
background-color: #3386c0;
color: #fff;
display: inline-block;
margin: 0;
padding: 10px 20px;
border: none;
cursor: pointer;
border-radius: 3px;
}

.overlay button:hover {
background-color: #4ea0da;
}

.overlay button:disabled {
background: #f5f5f5;
color: #c3c3c3;
}
</style>
<script src="https://unpkg.com/@turf/turf@6/turf.min.js"></script>

<div id="map"></div>
<div class="overlay">
<button id="replay">Replay</button>
</div>

<script>
	mapboxgl.accessToken = 'pk.eyJ1IjoicmVuYXRlcGllcm90dG8iLCJhIjoiY2l6NzR4ZzczMDAwbTJxbzBoMGR1bGppOCJ9.jh9gnXbl0LKRBI0Nyl0y7g';
const map = new mapboxgl.Map({
container: 'map',
// Choose from Mapbox's core styles, or make your own style with Mapbox Studio,
style: 'mapbox://styles/mapbox/dark-v11',
center: [-0.1184378, 51.5149717],
zoom: 10,
pitch: 40
});

// San Francisco
const origin = [-0.1876173, 51.489433];

// Washington DC
const destination = [-0.0448809, 51.5275221];

// A simple line from origin to destination.
const route = {
'type': 'FeatureCollection',
'features': [
{
'type': 'Feature',
'geometry': {
'type': 'LineString',
'coordinates': [origin, destination]
}
}
]
};

// A single point that animates along the route.
// Coordinates are initially set to origin.
const point = {
'type': 'FeatureCollection',
'features': [
{
'type': 'Feature',
'properties': {},
'geometry': {
'type': 'Point',
'coordinates': origin
}
}
]
};

// Calculate the distance in kilometers between route start/end point.
const lineDistance = turf.length(route.features[0]);

const arc = [];

// Number of steps to use in the arc and animation, more steps means
// a smoother arc and animation, but too many steps will result in a
// low frame rate
const steps = 500;

// Draw an arc between the `origin` & `destination` of the two points
for (let i = 0; i < lineDistance; i += lineDistance / steps) {
const segment = turf.along(route.features[0], i);
arc.push(segment.geometry.coordinates);
}

// Update the route with calculated arc coordinates
route.features[0].geometry.coordinates = arc;

// Used to increment the value of the point measurement against the route.
let counter = 0;

map.on('load', () => {
// Add a source and layer displaying a point which will be animated in a circle.
map.addSource('route', {
'type': 'geojson',
'data': route
});

map.addSource('point', {
'type': 'geojson',
'data': point
});

map.addLayer({
'id': 'route',
'source': 'route',
'type': 'line',
'paint': {
'line-width': 2,
'line-color': '#007cbf'
}
});

map.addLayer({
'id': 'point',
'source': 'point',
'type': 'symbol',
'layout': {
// This icon is a part of the Mapbox Streets style.
// To view all images available in a Mapbox style, open
// the style in Mapbox Studio and click the "Images" tab.
// To add a new image to the style at runtime see
// https://docs.mapbox.com/mapbox-gl-js/example/add-image/
'icon-image': 'airport',
'icon-size': 1.5,
'icon-rotate': ['get', 'bearing'],
'icon-rotation-alignment': 'map',
'icon-allow-overlap': true,
'icon-ignore-placement': true
}
});
let running = false;
function animate() {
running = true;
document.getElementById('replay').disabled = true;
const start =
route.features[0].geometry.coordinates[
counter >= steps ? counter - 1 : counter
];
const end =
route.features[0].geometry.coordinates[
counter >= steps ? counter : counter + 1
];
if (!start || !end) {
running = false;
document.getElementById('replay').disabled = false;
return;
}
// Update point geometry to a new position based on counter denoting
// the index to access the arc
point.features[0].geometry.coordinates =
route.features[0].geometry.coordinates[counter];

// Calculate the bearing to ensure the icon is rotated to match the route arc
// The bearing is calculated between the current point and the next point, except
// at the end of the arc, which uses the previous point and the current point
point.features[0].properties.bearing = turf.bearing(
turf.point(start),
turf.point(end)
);

// Update the source with this new data
map.getSource('point').setData(point);

// Request the next frame of animation as long as the end has not been reached
if (counter < steps) {
requestAnimationFrame(animate);
}

counter = counter + 1;
}

document.getElementById('replay').addEventListener('click', () => {
if (running) {
void 0;
} else {
// Set the coordinates of the original point back to origin
point.features[0].geometry.coordinates = origin;

// Update the source layer
map.getSource('point').setData(point);

// Reset the counter
counter = 0;

// Restart the animation
animate(counter);
}
});

// Start the animation
animate(counter);
});
</script>

</body>
</html>