-
Notifications
You must be signed in to change notification settings - Fork 0
/
storymap.js
201 lines (152 loc) · 6.6 KB
/
storymap.js
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
// Modified by Bo Zhao, [email protected]
// Originally obtained from http://atlefren.github.io/storymap/
// Updated on 2/22/2017 | version 2.1 | MIT License
(function ($) {
$.fn.storymap = function(options) {
var defaults = {
selector: '[data-scene]',
breakpointPos: '33.333%',
legend: false,
createMap: function () {
var map = L.map('map', {zoomControl: false}).setView([44, -120], 7);
L.tileLayer('https://api.tiles.mapbox.com/v4/{id}/{z}/{x}/{y}.png?access_token=pk.eyJ1IjoiamFrb2J6aGFvIiwiYSI6ImNpcms2YWsyMzAwMmtmbG5icTFxZ3ZkdncifQ.P9MBej1xacybKcDN_jehvw', {
maxZoom: 18,
attribution: '',
id: 'mapbox.light'
}).addTo(map);
return map;
}
};
var settings = $.extend(defaults, options);
if (typeof(L) === 'undefined') {
throw new Error('Storymap requires Laeaflet');
}
function getDistanceToTop(elem, top) {
var docViewTop = $(window).scrollTop();
var elemTop = $(elem).offset().top;
var dist = elemTop - docViewTop;
var d = top - dist;
if (d < 0) {
return $(document).height();
}
return d;
}
function highlightTopPara(paragraphs, top) {
var distances = $.map(paragraphs, function (element) {
var dist = getDistanceToTop(element, top);
return {el: $(element), distance: dist};
});
function findMin(pre, cur){
if (pre.distance > cur.distance) {
return cur;
} else {
return pre;
}
}
var closest = distances.reduce(findMin);
$.each(paragraphs, function (key, element) {
var paragraph = $(element);
if (paragraph[0] !== closest.el[0]) {
paragraph.trigger('notviewing');
}
});
if (!closest.el.hasClass('viewing')) {
closest.el.trigger('viewing');
}
}
function watchHighlight(element, searchfor, top) {
var paragraphs = element.find(searchfor);
highlightTopPara(paragraphs, top);
$(window).scroll(function () {
highlightTopPara(paragraphs, top);
});
}
var makeStoryMap = function (element, scenes, layers) {
var topElem = $('<div class="breakpoint-current"></div>')
.css('top', settings.breakpointPos);
$('body').append(topElem);
var top = topElem.offset().top - $(window).scrollTop();
var searchfor = settings.selector;
var paragraphs = element.find(searchfor);
paragraphs.on('viewing', function () {
$(this).addClass('viewing');
});
paragraphs.on('notviewing', function () {
$(this).removeClass('viewing');
});
watchHighlight(element, searchfor, top);
var downBtn = element.find('.arrow-down');
downBtn.click(function () {
window.scrollBy(0, $(window).height() / 3);
});
var map = settings.createMap();
var currentLayerGroup = L.layerGroup().addTo(map);
var legendControl = L.control({position: 'topright'});
$.each(paragraphs, function (key, element) {
var paragraph = $(element);
if (paragraph[0].className == 'viewing') {
var scene = scenes[paragraph[0].attributes['data-scene'].value];
map.setView([scene.lat, scene.lng], scene.zoom);
var layernames = scene.layers;
var legendContent = "";
if(typeof layernames !== 'undefined') {
for (var i = 0; i < layernames.length; i++) {
//add new layers
currentLayerGroup.addLayer(layers[layernames[i]][0]);
//add new legends
if (layers[layernames[i]].length == 2) {
legendContent += layers[layernames[i]][1];
}
}
}
legendControl.onAdd = function () {
var div = new L.DomUtil.create('div', 'legend');
div.innerHTML = legendContent;
return div;
};
if (settings.legend == true && legendContent != "")
{
legendControl.addTo(map);
}
}
});
function showMapView(key) {
currentLayerGroup.clearLayers();
if (settings.legend == true)
{
legendControl.remove();
}
var scene = scenes[key];
var layernames = scene.layers;
var legendContent = "";
if(typeof layernames !== 'undefined'){
for (var i=0; i < layernames.length; i++)
{
currentLayerGroup.addLayer(layers[layernames[i]][0]);
if (layers[layernames[i]].length == 2) {
legendContent += layers[layernames[i]][1];
}
}
}
legendControl.onAdd = function () {
var div = new L.DomUtil.create('div', 'legend');
div.innerHTML = legendContent;
return div;
};
// the condition legendContent != "" will make sure the legend will only be added on when there is content in the legend.
if (settings.legend == true && legendContent != "")
{
legendControl.addTo(map);
}
// if you don't want to show a marker at the center of the map, you can simply comment the following line.
// currentLayerGroup.addLayer(L.marker([scene.lat, scene.lon]));
map.setView([scene.lat, scene.lng], scene.zoom, 1);
}
paragraphs.on('viewing', function () {
showMapView($(this).data('scene'));
});
};
makeStoryMap(this, settings.scenes, settings.layers);
return this;
}
}(jQuery));