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Make wheel-zoom speed depend on a new wheelPxPerZoomLevel option

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This commit is contained in:
Iván Sánchez Ortega 2016-02-04 12:27:23 +01:00
parent f43950e3fa
commit a1ff60bf9b
2 changed files with 10 additions and 6 deletions
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6
debug/map/zoom-delta.html
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@ -71,7 +71,8 @@
layers: [osm1],
zoom: 5,
zoomSnap: 0.25,
zoomDelta: 0.5
zoomDelta: 0.5,
wheelPxPerZoomLevel: 50
});
var map2 = new L.Map('map2', {
@ -79,7 +80,8 @@
layers: [osm2],
zoom: 5,
zoomSnap: 0,
zoomDelta: 0.25
zoomDelta: 0.25,
wheelPxPerZoomLevel: 50
});
map1.on('zoomend',function(){

10
src/map/handler/Map.ScrollWheelZoom.js
View File

@ -4,7 +4,8 @@
L.Map.mergeOptions({
scrollWheelZoom: true,
wheelDebounceTime: 40
wheelDebounceTime: 40,
wheelPxPerZoomLevel: 50
});
L.Map.ScrollWheelZoom = L.Handler.extend({
@ -45,9 +46,10 @@ L.Map.ScrollWheelZoom = L.Handler.extend({
map._stop(); // stop panning and fly animations if any
// map the delta with a sigmoid function to -4..4 range leaning on -1..1
var d2 = Math.ceil(4 * Math.log(2 / (1 + Math.exp(-Math.abs(this._delta / 200)))) / Math.LN2),
d3 = d2 * this._map.options.zoomDelta,
delta = map._limitZoom(zoom + (this._delta > 0 ? d3 : -d3)) - zoom;
var d2 = this._delta / (this._map.options.wheelPxPerZoomLevel * 4),
d3 = 4 * Math.log(2 / (1 + Math.exp(-Math.abs(d2)))) / Math.LN2,
d4 = Math.max(d3, this._map.options.zoomSnap || 0),
delta = map._limitZoom(zoom + (this._delta > 0 ? d4 : -d4)) - zoom;
this._delta = 0;
this._startTime = null;