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custom_heatmap_leaflet.js
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custom_heatmap_leaflet.js
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/*
(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
},
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 (var 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).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)
};