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fix scale #5

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fix scale #5

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aa7d99a
fix scale
SnezhanaAbramova May 4, 2023
889aa90
fix comma
SnezhanaAbramova May 4, 2023
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22 changes: 9 additions & 13 deletions src/L.Control.SwitchScaleControl.js
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Original file line number Diff line number Diff line change
Expand Up @@ -27,9 +27,10 @@ L.Control.SwitchScaleControl = L.Control.extend({
return px;
},

// Returns width of map in meters on specified latitude.
getMapWidthForLanInMeters: function (currentLan) {
return 6378137 * 2 * Math.PI * Math.cos(currentLan * Math.PI / 180);
// https://github.com/datalyze-solutions/TileMapScaleLevels/blob/master/tilemapscalelevels.py#L41
magic: function() {
// 256 - from function scale for CRS
return 6378137 * 2 * Math.PI / 256;
}
},

Expand Down Expand Up @@ -107,10 +108,9 @@ L.Control.SwitchScaleControl = L.Control.extend({

var setScaleRatio = function (scaleRatio) {
if (scaleRatio) {
var bounds = this._map.getBounds(),
centerLat = bounds.getCenter().lat,
crsScale = this._pixelsInMeterWidth * options.getMapWidthForLanInMeters(centerLat) / scaleRatio;
this._map.setZoom(this._map.options.crs.zoom(crsScale));
// from https://github.com/datalyze-solutions/TileMapScaleLevels/blob/master/tilemapscalelevels.py#L52
var zoom = Math.log2((this._pixelsInMeterWidth * options.magic()) / scaleRatio).toFixed(1);
this._map.setZoom(zoom);
}
};

Expand Down Expand Up @@ -205,18 +205,14 @@ L.Control.SwitchScaleControl = L.Control.extend({
},

_updateFunction: function (isRound) {
var dist,
bounds = this._map.getBounds(),
options = this.options;

var centerLat = bounds.getCenter().lat;
var options = this.options;

var size = this._map.getSize(),
physicalScaleRatio = 0;

if (size.x > 0) {
if (options.ratio) {
physicalScaleRatio = this._pixelsInMeterWidth * options.getMapWidthForLanInMeters(centerLat) / this._map.options.crs.scale(this._map.getZoom());
physicalScaleRatio = this._pixelsInMeterWidth * options.magic() / Math.pow(2, this._map.getZoom());
}
}

Expand Down