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Leaflet map: Canvas Overlay for Leaflet 1.x
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| <!doctype html> | |
| <html> | |
| <head> | |
| <title>Many Points with leaflet Canvas</title> | |
| <meta charset="utf-8"> | |
| <style> | |
| html, body { | |
| height: 100%; | |
| padding: 0; | |
| margin: 0; | |
| background: rgb(14, 21, 30); | |
| height: 100%; | |
| } | |
| #map { | |
| position: absolute; | |
| height: 100%; | |
| width: 100%; | |
| background-color: #333; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="map"></div> | |
| <link rel="stylesheet" href="https://unpkg.com/leaflet@1.7.1/dist/leaflet.css"/> | |
| <script src="https://unpkg.com/leaflet@1.7.1/dist/leaflet.js"></script> | |
| <!-- | |
| <link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.7.2/leaflet.css" /> | |
| <script src="http://cdn.leafletjs.com/leaflet-0.7.2/leaflet.js"></script> | |
| --> | |
| <script src="L.CanvasOverlay.js"></script> | |
| <script src="http://www.sumbera.com/gist/data.js" charset="utf-8"></script> | |
| <script> | |
| var points = data; // data loaded from data.js | |
| var leafletMap = L.map('map').setView([50.00, 14.44], 9); | |
| L.tileLayer("http://{s}.sm.mapstack.stamen.com/(toner-lite,$fff[difference],$fff[@23],$fff[hsl-saturation@20])/{z}/{x}/{y}.png") | |
| .addTo(leafletMap); | |
| L.canvasOverlay() | |
| .drawing(drawingOnCanvas) | |
| .addTo(leafletMap); | |
| function drawingOnCanvas(canvasOverlay, params) { | |
| var ctx = params.canvas.getContext('2d'); | |
| ctx.clearRect(0, 0, params.canvas.width, params.canvas.height); | |
| ctx.fillStyle = "rgba(255,116,0, 0.2)"; | |
| for (var i = 0; i < data.length; i++) { | |
| var d = data[i]; | |
| if (params.bounds.contains([d[0], d[1]])) { | |
| dot = canvasOverlay._map.latLngToContainerPoint([d[0], d[1]]); | |
| ctx.beginPath(); | |
| ctx.arc(dot.x, dot.y, 3, 0, Math.PI * 2); | |
| ctx.fill(); | |
| ctx.closePath(); | |
| } | |
| } | |
| }; | |
| </script> | |
| </body> | |
| </html> |
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updated for
leaflet@1.7