8ce28334cc
this should also prevent mixed release plugins/test IITC builds causing issues with it's 'show more portals' plugin further changes are planned - by lying to the backend about the map zoom to optimise the portal detail level (density) returned and make better use of the data cache. needs some practical experimentation to get good adjustments, and a cleaner API for these plugins
67 lines
2.5 KiB
JavaScript
67 lines
2.5 KiB
JavaScript
// MAP DATA REQUEST CALCULATORS //////////////////////////////////////
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// Ingress Intel splits up requests for map data (portals, links,
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// fields) into tiles. To get data for the current viewport (i.e. what
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// is currently visible) it first calculates which tiles intersect.
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// For all those tiles, it then calculates the lat/lng bounds of that
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// tile and a quadkey. Both the bounds and the quadkey are “somewhat”
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// required to get complete data.
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//
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// Conversion functions courtesy of
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// http://wiki.openstreetmap.org/wiki/Slippy_map_tilenames
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window.getMapZoomTileParameters = function(zoom) {
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// these arrays/constants are based on those in the stock intel site. it's essential we keep them in sync with their code
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// (it may be worth reading the values from their code rather than using our own copies? it's a case of either
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// breaking if they rename their variables if we do, or breaking if they change the values if we don't)
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var ZOOM_TO_TILES_PER_EDGE = [32, 32, 32, 32, 256, 256, 256, 1024, 1024, 1536, 4096, 4096, 16384, 16384, 16384];
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var MAX_TILES_PER_EDGE = 65536;
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var ZOOM_TO_LEVEL = [8, 8, 8, 8, 7, 7, 7, 6, 6, 5, 4, 4, 3, 2, 2, 1, 1];
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return {
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level: ZOOM_TO_LEVEL[zoom] || 0, // default to level 0 (all portals) if not in array
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tilesPerEdge: ZOOM_TO_TILES_PER_EDGE[zoom] || MAX_TILES_PER_EDGE,
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zoom: zoom // include the zoom level, for reference
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};
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}
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window.lngToTile = function(lng, params) {
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return Math.floor((lng + 180) / 360 * params.tilesPerEdge);
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}
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window.latToTile = function(lat, params) {
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return Math.floor((1 - Math.log(Math.tan(lat * Math.PI / 180) +
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1 / Math.cos(lat * Math.PI / 180)) / Math.PI) / 2 * params.tilesPerEdge);
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}
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window.tileToLng = function(x, params) {
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return x / params.tilesPerEdge * 360 - 180;
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}
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window.tileToLat = function(y, params) {
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var n = Math.PI - 2 * Math.PI * y / params.tilesPerEdge;
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return 180 / Math.PI * Math.atan(0.5 * (Math.exp(n) - Math.exp(-n)));
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}
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window.pointToTileId = function(params, x, y) {
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return params.zoom + "_" + x + "_" + y;
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}
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window.getResonatorLatLng = function(dist, slot, portalLatLng) {
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// offset in meters
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var dn = dist*SLOT_TO_LAT[slot];
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var de = dist*SLOT_TO_LNG[slot];
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// Coordinate offset in radians
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var dLat = dn/EARTH_RADIUS;
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var dLon = de/(EARTH_RADIUS*Math.cos(Math.PI/180*portalLatLng[0]));
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// OffsetPosition, decimal degrees
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var lat0 = portalLatLng[0] + dLat * 180/Math.PI;
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var lon0 = portalLatLng[1] + dLon * 180/Math.PI;
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return [lat0, lon0];
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}
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