-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathcustom_heatmap_leaflet.js
155 lines (151 loc) · 7.1 KB
/
custom_heatmap_leaflet.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
/*
(c) 2014, Vladimir Agafonkin
simpleheat, a tiny JavaScript library for drawing heatmaps with Canvas
https://github.com/mourner/simpleheat
LoohpJames
Modified for hk-journey-time-heat-map
*/
! function() {
"use strict";
function t(i) {
return this instanceof t ? (this._canvas = i = "string" == typeof i ? document.getElementById(i) : i, this._ctx = i.getContext("2d", {willReadFrequently: true}), this._width = i.width, this._height = i.height, this._max = 1, void this.clear()) : new t(i)
}
t.prototype = {
defaultRadius: 25,
defaultGradient: {
.4: "blue",
.6: "cyan",
.7: "lime",
.8: "yellow",
1: "red"
},
data: function(t, i) {
return this._data = t, this
},
max: function(t) {
return this._max = t, this
},
add: function(t) {
return this._data.push(t), this
},
clear: function() {
return this._data = [], this
},
clip: function(map, enabled) {
this._ctx.reset();
if (enabled && districtBoundaries !== null) {
clipCanvasToPolygons(districtBoundaries, map, this._ctx);
this._ctx.drawImage(this._circle, 0, 0);
}
return this
},
radius: function(t, i) {
i = i || 15;
var a = this._circle = document.createElement("canvas"),
s = a.getContext("2d"),
e = this._r = t + i;
return a.width = a.height = 2 * e, s.shadowOffsetX = s.shadowOffsetY = 200, s.shadowBlur = i, s.shadowColor = "black", s.beginPath(), s.arc(e - 200, e - 200, t, 0, 2 * Math.PI, !0), s.closePath(), s.fill(), this
},
gradient: function(t) {
var i = document.createElement("canvas"),
a = i.getContext("2d"),
s = a.createLinearGradient(0, 0, 0, 256);
i.width = 1, i.height = 256;
for (var e in t) s.addColorStop(e, t[e]);
return a.fillStyle = s, a.fillRect(0, 0, 1, 256), this._grad = a.getImageData(0, 0, 1, 256).data, this
},
draw: function(t) {
this._circle || this.radius(this.defaultRadius), this._grad || this.gradient(this.defaultGradient);
var i = this._ctx;
i.clearRect(0, 0, this._width, this._height);
for (var a, s = 0, e = this._data.length; e > s; s++) a = this._data[s], i.globalAlpha = Math.max(a[2] / this._max, t || .05), i.drawImage(this._circle, a[0] - this._r, a[1] - this._r);
var n = i.getImageData(0, 0, this._width, this._height);
return this._colorize(n.data, this._grad), i.putImageData(n, 0, 0), this
},
_colorize: function(t, i) {
for (let a, s = 3, e = t.length; e > s; s += 4) {
a = 4 * t[s];
if (a) {
t[s - 3] = i[a]; // Red channel
t[s - 2] = i[a + 1]; // Green channel
t[s - 1] = i[a + 2]; // Blue channel
t[s] *= maxTransparency; // Cap the alpha channel
}
}
}
}, window.simpleheat = t
}(),
L.HeatLayer = (L.Layer ? L.Layer : L.Class).extend({
initialize: function(t, i) {
this._latlngs = t, L.setOptions(this, i)
},
setLatLngs: function(t) {
return this._latlngs = t, this.redraw()
},
addLatLng: function(t) {
return this._latlngs.push(t), this.redraw()
},
setOptions: function(t) {
return L.setOptions(this, t), this._heat && this._updateOptions(), this.redraw()
},
redraw: function() {
return !this._heat || this._frame || this._map._animating || (this._frame = L.Util.requestAnimFrame(this._redraw, this)), this
},
onAdd: function(t) {
this._map = t, this._canvas || this._initCanvas(), t._panes.overlayPane.appendChild(this._canvas), t.on("moveend", this._reset, this), t.options.zoomAnimation && L.Browser.any3d && t.on("zoomanim", this._animateZoom, this), this._reset()
},
onRemove: function(t) {
t.getPanes().overlayPane.removeChild(this._canvas), t.off("moveend", this._reset, this), t.options.zoomAnimation && t.off("zoomanim", this._animateZoom, this)
},
addTo: function(t) {
return t.addLayer(this), this
},
_initCanvas: function() {
var t = this._canvas = L.DomUtil.create("canvas", "leaflet-heatmap-layer leaflet-layer"),
i = L.DomUtil.testProp(["transformOrigin", "WebkitTransformOrigin", "msTransformOrigin"]);
t.style[i] = "50% 50%";
var a = this._map.getSize();
t.width = a.x, t.height = a.y;
var s = this._map.options.zoomAnimation && L.Browser.any3d;
L.DomUtil.addClass(t, "leaflet-zoom-" + (s ? "animated" : "hide")), this._heat = simpleheat(t), this._updateOptions()
},
_updateOptions: function() {
this._heat.radius(this.options.radius || this._heat.defaultRadius, this.options.blur), this.options.gradient && this._heat.gradient(this.options.gradient), this.options.max && this._heat.max(this.options.max)
},
_reset: function() {
var t = this._map.containerPointToLayerPoint([0, 0]);
L.DomUtil.setPosition(this._canvas, t);
var i = this._map.getSize();
this._heat._width !== i.x && (this._canvas.width = this._heat._width = i.x), this._heat._height !== i.y && (this._canvas.height = this._heat._height = i.y), this._redraw()
},
_redraw: function() {
if (!this._map) {
return;
}
var data = [],
r = this._heat._r,
max = this.options.max === undefined ? 1 : this.options.max,
cellSize = r / 2;
for (let x = -r; x < this._map._container.offsetWidth + r; x += cellSize) {
for (let y = -r; y < this._map._container.offsetHeight + r; y += cellSize) {
const {lat, lng} = this._map.containerPointToLatLng([x, y]);
const {time} = getMinTimeAt(lat, lng);
if (time) {
const intensity = calculateIntensityByTravelTime(time);
if (intensity > 0) {
data.push([x, y, Math.min(intensity, max)]);
}
}
}
}
this._heat.data(data).clip(this._map, clipToBoundaries).draw(this.options.minOpacity);
this._frame = null;
},
_animateZoom: function(t) {
var i = this._map.getZoomScale(t.zoom),
a = this._map._getCenterOffset(t.center)._multiplyBy(-i).subtract(this._map._getMapPanePos());
L.DomUtil.setTransform ? L.DomUtil.setTransform(this._canvas, a, i) : this._canvas.style[L.DomUtil.TRANSFORM] = L.DomUtil.getTranslateString(a) + " scale(" + i + ")"
}
}), L.heatLayer = function(t, i) {
return new L.HeatLayer(t, i)
};