How to load the effect of Thermal Map in Leaflet
This article mainly introduces how to load the heat map effect in Leaflet, which has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, let the editor take you to understand it.
Leaflet is an open source JavaScript class library for interactive maps on the desktop and mobile. The size of the JS library is about 38k after compression, and it has all the map functions that developers need.
Leaflet maintains the design idea of simplicity, performance and practicality. It works efficiently on all major desktop and mobile platforms and can extend plug-ins. It has a beautiful, easy-to-use and well-documented API, and a simple, easy-to-read source code.
Heatmap.js is a lightweight, easy-to-use js class library, through the library reference, you can easily create a heat map, the address on github is https://github.com/pa7/heatmap.js, which provides a number of examples, including Leaflet or Google Maps.
Load the thermal map on Leaflet, and there is a ready-made class library. The specific usage is as follows:
Reference heatmap.js, and then reference heatmap.js/plugins/leaflet-heatmap/leaflet-heatmap.js, and develop according to the sample code on example. The following is a sample development based on the actual data. For specific parameters, please see the page description on github.
/ / load the corresponding class library
Require (['leaflet-heatmap'], function (HeatmapOverlay) {
/ / json request data
$.getJSON ('sampledata/ta_school.json', function (data) {
/ / set parameters
Var cfg = {
Radius: .007
"maxOpacity": .65
"scaleRadius": true
"useLocalExtrema": true
LatField: 'cy'
LngField: 'cx'
ValueField: 'cnt'
}
/ / define the thermal map
Var heatmapLayer = new HeatmapOverlay (cfg)
HeatmapLayer.setData (data)
LayerControl.addOverlay (heatmapLayer, thermal map)
});
});
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