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leaflet-streets: Improve orientation detection for street names

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This commit is contained in:
Markus Koch 2020-04-19 22:00:35 +02:00
parent be65b093a1
commit ba466fe474
1 changed files with 16 additions and 13 deletions
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29
htdocs/leafletjs/Leaflet.streetlabels.js
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@ -126,8 +126,7 @@ L.StreetLabels = L.LabelTextCollision
var stopCoords = layer.getLatLngs()[layer.getLatLngs().length - 1];
//Flip lineString if bearing is negative
if (this._getBearing(startCoords, stopCoords) < 0)
layer = this._getLineStringReverse(layer);
flip = (this._getBearing(startCoords, stopCoords) < 0);
if (layer._parts) {
ctx.textAlign = "center";
@ -137,7 +136,7 @@ L.StreetLabels = L.LabelTextCollision
//Build the points list for the first part
var pathPoints = [];
for (var i = 0; i < part.length; i++) {
var linePart = part[i];
var linePart = (flip ? part[part.length - 1 - i] : part[i]);
pathPoints.push(linePart.x);
pathPoints.push(linePart.y);
}
@ -158,16 +157,20 @@ L.StreetLabels = L.LabelTextCollision
Source: https://makinacorpus.github.io/Leaflet.GeometryUtil/leaflet.geometryutil.js.html
*/
_getBearing: function (startCoords, stopCoords) {
var rad = Math.PI / 180,
lat1 = startCoords.lat * rad,
lat2 = stopCoords.lat * rad,
lon1 = startCoords.lng * rad,
lon2 = stopCoords.lng * rad,
y = Math.sin(lon2 - lon1) * Math.cos(lat2),
x = Math.cos(lat1) * Math.sin(lat2) -
Math.sin(lat1) * Math.cos(lat2) * Math.cos(lon2 - lon1);
var bearing = ((Math.atan2(y, x) * 180 / Math.PI) + 360) % 360;
return bearing >= 180 ? bearing - 360 : bearing;
if (startCoords.lat == stopCoords.lat) {
if (startCoords.lng > stopCoords.lng)
return -180;
else
return 180;
}
if (startCoords.lng == stopCoords.lng) {
if (startCoords.lat > stopCoords.lat)
return -90;
else
return 90;
}
var angle = Math.atan(stopCoords.lng - startCoords.lng, stopCoords.lat - startCoords.lat) * 180 / Math.Pi;
return angle;
},
/**