experimental code: alternative marker rendering system, using canvas to create icon marker bitmaps, displaying as an L.Icon

plugins/marker-canvas-icon-data.user.js

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+// ==UserScript==
+// @id             iitc-plugin-marker-canvas-icon@jonatkins
+// @name           IITC plugin: Marker drawn using icons from canvas data URLs
+// @category       Tweaks
+// @version        0.1.0.@@DATETIMEVERSION@@
+// @namespace      https://github.com/jonatkins/ingress-intel-total-conversion
+// @updateURL      @@UPDATEURL@@
+// @downloadURL    @@DOWNLOADURL@@
+// @description    [@@BUILDNAME@@-@@BUILDDATE@@] EXPERIMENTAL: draw markers using individual Leaflet Icons, created from canvas elements converted to data: URLs
+// @include        https://www.ingress.com/intel*
+// @include        http://www.ingress.com/intel*
+// @match          https://www.ingress.com/intel*
+// @match          http://www.ingress.com/intel*
+// @grant          none
+// ==/UserScript==
+
+@@PLUGINSTART@@
+
+// PLUGIN START ////////////////////////////////////////////////////////
+
+
+// use own namespace for plugin
+window.plugin.markerIconCanvasUrl = function() {};
+
+window.plugin.markerIconCanvasUrl.setup  = function() {
+
+  // create a new marker. 'data' contain the IITC-specific entity data to be stored in the object options
+  window.createMarker = function(latlng, data) {
+    var icon = createMarkerIcon(data);
+
+    var options = L.extend({}, data, { icon: icon });
+
+    var marker = L.marker (latlng, options);
+    marker.bringToFront = function(){}; //TEMP - until the rest of IITC code is changed to take account of non-path markers
+    return marker;
+
+  }
+
+  window.setMarkerStyle = function(marker, selected) {
+    var icon = createMarkerIcon(marker.options,selected);
+
+    marker.setIcon(icon);
+
+  }
+
+
+  window.createMarkerIcon = function(details,selected) {
+    var scale = window.portalMarkerScale();
+
+    var lvlWeight = Math.max(2, Math.floor(details.level) / 1.5) * scale;
+    var lvlRadius = (details.team === window.TEAM_NONE ? 7 : Math.floor(details.level) + 4) * scale;
+
+    lvlRadius += (L.Browser.mobile ? PORTAL_RADIUS_ENLARGE_MOBILE*scale : 0);
+
+    var fillColor = COLORS[details.team];
+    var fillAlpha = 0.5;
+
+    var lineColor = selected ? COLOR_SELECTED_PORTAL : COLORS[details.team];
+    var lineAlpha = 1.0;
+
+    var cacheKey = ([lvlRadius,lvlWeight,fillColor,fillAlpha,lineColor,lineAlpha]).join(':');
+
+    if (!window.markerIconCache[cacheKey]) {
+      window.markerIconCache[cacheKey] = createNewMarkerIcon(lvlRadius,lvlWeight,fillColor,fillAlpha,lineColor,lineAlpha);
+    }
+    return window.markerIconCache[cacheKey];
+  }
+
+  window.markerIconCache = {};
+
+  window.createNewMarkerIcon = function (radius,weight,fillcol,fillalpha,linecol,linealpha) {
+
+    var size = Math.ceil(radius + weight/2)*2;
+    var anchor = Math.floor(size/2);
+
+
+    var canvas = document.createElement('canvas');
+    canvas.width = size;
+    canvas.height = size;
+
+    var ctx = canvas.getContext('2d');
+    ctx.beginPath();
+
+    ctx.arc(anchor,anchor,radius,0,2*Math.PI);
+
+    ctx.fillStyle = fillcol;
+    ctx.globalAlpha = fillalpha;
+
+    ctx.fill();
+
+    ctx.lineWidth = weight;
+    ctx.strokeStyle = linecol;
+    ctx.globalAlpha = linealpha;
+
+    ctx.stroke();
+
+    var dataurl = canvas.toDataURL();
+
+    return L.icon({
+      iconUrl: dataurl,
+      iconSize: [size,size],
+      iconAnchor: [anchor,anchor]
+    });
+
+  }
+
+
+
+};
+
+var setup =  window.plugin.markerIconCanvasUrl.setup;
+
+// PLUGIN END //////////////////////////////////////////////////////////
+
+@@PLUGINEND@@