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set zoom level for search results links based on results bounding box… #37

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merged 1 commit into from
Oct 28, 2020
Merged

set zoom level for search results links based on results bounding box… #37

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15 changes: 11 additions & 4 deletions mbgl-map.js
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Original file line number Diff line number Diff line change
Expand Up @@ -214,13 +214,20 @@ document.addEventListener("DOMContentLoaded", function(){
return li;
}

function BBoxToZoomLevel(bbox) {
// for now always use 13.5
return 13.5;
// This picks the largest zoom level for which one tile fits within the lon range of the bbox.
// Note: for zoom level z, one tile has width 260/2^z degrees.
// A better implementation would also look at the latitude range.
function zoomLevelForSearchResultsItem(item) {
if (!('boundingbox' in item)) {
return 13.5;
}
const lon1 = item['boundingbox'][2];
const lon2 = item['boundingbox'][3];
return 1 + Math.floor(Math.log(360/Math.abs(lon1 - lon2)) / Math.log(2));
}

function searchResultsURL(item) {
return "/#" + BBoxToZoomLevel(item) + "/" + item.lat + "/" + item.lon;
return "/#" + zoomLevelForSearchResultsItem(item) + "/" + item.lat + "/" + item.lon;
}


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