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Makes the leaflet map in openguessr scroll more smoothly
// ==UserScript==
// @name Smooth scroll geoguessr map
// @match https://openguessr.com/*
// @grant none
// @version 1.0
// @author ItsPi3141
// @description Makes the leaflet map in openguessr scroll more smoothly
// @run-at document-start
// @license MIT
// @namespace https://greasyfork.org/users/1334015
// ==/UserScript==
let injected = false;
const originalFunctionCall = Function.prototype.call;
Function.prototype.call = function (...args) {
if (!injected && args[0]?._leaflet_id) {
inject();
applyStyles();
injected = true;
}
return originalFunctionCall.apply(this, args);
};
// https://github.com/mutsuyuki/Leaflet.SmoothWheelZoom
const inject = () => {
L.Map.mergeOptions({
scrollWheelZoom: false,
smoothWheelZoom: true,
smoothSensitivity: 2,
});
L.Map.SmoothWheelZoom = L.Handler.extend({
addHooks: function () {
L.DomEvent.on(this._map._container, "wheel", this._onWheelScroll, this);
},
removeHooks: function () {
L.DomEvent.off(this._map._container, "wheel", this._onWheelScroll, this);
},
_onWheelScroll: function (e) {
if (!this._isWheeling) {
this._onWheelStart(e);
}
this._onWheeling(e);
},
_onWheelStart: function (e) {
var map = this._map;
this._isWheeling = true;
this._wheelMousePosition = map.mouseEventToContainerPoint(e);
this._centerPoint = map.getSize()._divideBy(2);
this._startLatLng = map.containerPointToLatLng(this._centerPoint);
this._wheelStartLatLng = map.containerPointToLatLng(
this._wheelMousePosition,
);
this._startZoom = map.getZoom();
this._moved = false;
this._zooming = true;
map._stop();
if (map._panAnim) map._panAnim.stop();
this._goalZoom = map.getZoom();
this._prevCenter = map.getCenter();
this._prevZoom = map.getZoom();
this._zoomAnimationId = requestAnimationFrame(
this._updateWheelZoom.bind(this),
);
},
_onWheeling: function (e) {
var map = this._map;
this._goalZoom =
this._goalZoom +
L.DomEvent.getWheelDelta(e) * 0.003 * map.options.smoothSensitivity;
if (
this._goalZoom < map.getMinZoom() ||
this._goalZoom > map.getMaxZoom()
) {
this._goalZoom = map._limitZoom(this._goalZoom);
}
this._wheelMousePosition = this._map.mouseEventToContainerPoint(e);
clearTimeout(this._timeoutId);
this._timeoutId = setTimeout(this._onWheelEnd.bind(this), 200);
L.DomEvent.preventDefault(e);
L.DomEvent.stopPropagation(e);
},
_onWheelEnd: function (e) {
this._isWheeling = false;
cancelAnimationFrame(this._zoomAnimationId);
this._map._moveEnd(true);
},
_updateWheelZoom: function () {
var map = this._map;
if (
!map.getCenter().equals(this._prevCenter) ||
map.getZoom() != this._prevZoom
)
return;
this._zoom = map.getZoom() + (this._goalZoom - map.getZoom()) * 0.3;
this._zoom = Math.floor(this._zoom * 100) / 100;
var delta = this._wheelMousePosition.subtract(this._centerPoint);
if (delta.x === 0 && delta.y === 0) return;
if (map.options.smoothWheelZoom === "center") {
this._center = this._startLatLng;
} else {
this._center = map.unproject(
map.project(this._wheelStartLatLng, this._zoom).subtract(delta),
this._zoom,
);
}
if (!this._moved) {
map._moveStart(true, false);
this._moved = true;
}
map._move(this._center, this._zoom);
this._prevCenter = map.getCenter();
this._prevZoom = map.getZoom();
this._zoomAnimationId = requestAnimationFrame(
this._updateWheelZoom.bind(this),
);
},
});
L.Map.addInitHook("addHandler", "smoothWheelZoom", L.Map.SmoothWheelZoom);
};
const applyStyles = () => {
const styles = document.createElement("style");
styles.innerHTML = `.leaflet-zoom-animated {
transition: 0.1s transform ease-out;
}
.leaflet-layer :is([style*='z-index: 17']) {
opacity: 0 !important;
}`;
document.head.appendChild(styles);
};