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Leaflet.PolylineMeasure.js
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/*********************************************************
** **
** Leaflet Plugin "Leaflet.PolylineMeasure" **
** File "Leaflet.PolylineMeasure.js" **
** Date: 2023-11-07 **
** **
*********************************************************/
(function (factory) {
if (typeof define === 'function' && define.amd) {
// AMD
define(['leaflet'], factory);
} else if (typeof module !== 'undefined') {
// Node/CommonJS
module.exports = factory(require('leaflet'));
} else {
// Browser globals
if (typeof window.L === 'undefined') {
throw new Error('Leaflet must be loaded first');
}
factory(window.L);
}
}(function (L) {
var _measureControlId = 'polyline-measure-control';
var _unicodeClass = 'polyline-measure-unicode-icon';
var isMacOS = navigator.platform === 'MacIntel';
/**
* Polyline Measure class
* @extends L.Control
*/
L.Control.PolylineMeasure = L.Control.extend({
/**
* Default options for the tool
* @type {Object}
*/
options: {
/**
* Position to show the control. Possible values are: 'topright', 'topleft', 'bottomright', 'bottomleft'
* @type {String}
* @default
*/
position: 'topleft',
/**
* Default unit the distances are displayed in. Possible values are: 'kilometres', 'landmiles', 'nauticalmiles'
* @type {String}
* @default
*/
unit: 'kilometres',
/**
* Use subunits (metres/feet) in tooltips in case of distances less then 1 kilometre/landmile
* @type {Boolean}
* @default
*/
useSubunits: true,
/**
* Clear all measurements when Measure Control is switched off
* @type {Boolean}
* @default
*/
clearMeasurementsOnStop: true,
/**
* Whether bearings are displayed within the tooltips
* @type {Boolean}
* @default
*/
showBearings: false,
/**
* Text for the bearing In
* @type {String}
* @default
*/
bearingTextIn: 'In',
/**
* Text for the bearing Out
* @type {String}
* @default
*/
bearingTextOut: 'Out',
/**
* Text for last point's tooltip
* @type {String}
* @default
*/
tooltipTextFinish: 'Click to <b>finish line</b><br>',
tooltipTextDelete: 'Press SHIFT-key and click to <b>delete point</b>',
tooltipTextMove: 'Click and drag to <b>move point</b><br>',
tooltipTextResume: '<br>Press ' + (isMacOS ? '⌘' : 'CTRL-key') + ' and click to <b>resume line</b>',
tooltipTextAdd: 'Press ' + (isMacOS ? '⌘' : 'CTRL-key') + ' and click to <b>add point</b>',
/**
* Title for the control going to be switched on
* @type {String}
* @default
*/
measureControlTitleOn: "Turn on PolylineMeasure",
/**
* Title for the control going to be switched off
* @type {String}
* @default
*/
measureControlTitleOff: "Turn off PolylineMeasure",
/**
* Label of the Measure control (maybe a unicode symbol)
* @type {String}
* @default
*/
measureControlLabel: '↦',
/**
* Classes to apply to the Measure control
* @type {Array}
* @default
*/
measureControlClasses: [],
/**
* Show a control to clear all the measurements
* @type {Boolean}
* @default
*/
showClearControl: false,
/**
* Title text to show on the Clear measurements control button
* @type {String}
* @default
*/
clearControlTitle: 'Clear Measurements',
/**
* Label of the Clear control (maybe a unicode symbol)
* @type {String}
* @default
*/
clearControlLabel: '×',
/**
* Classes to apply to Clear control button
* @type {Array}
* @default
*/
clearControlClasses: [],
/**
* Show a control to change the units of measurements
* @type {Boolean}
* @default
*/
showUnitControl: false,
/**
* The measurement units that can be cycled through by using the Unit Control button
* @type {Array}
* @default
*/
unitControlUnits: ["kilometres" , "landmiles", "nauticalmiles"],
/**
* Title texts to show on the Unit Control button
* @type {Object}
* @default
*/
unitControlTitle: {
text: 'Change Units',
kilometres: 'kilometres',
landmiles: 'land miles',
nauticalmiles: 'nautical miles'
},
/**
* Unit symbols to show in the Unit Control button and measurement labels
* @type {Object}
* @default
*/
unitControlLabel: {
metres: 'm',
kilometres: 'km',
feet: 'ft',
landmiles: 'mi',
nauticalmiles: 'nm'
},
/**
* Classes to apply to the Unit control
* @type {Array}
* @default
*/
unitControlClasses: [],
/**
* Styling settings for the temporary dashed rubberline
* @type {Object}
*/
tempLine: {
/**
* Dashed line color
* @type {String}
* @default
*/
color: '#00f',
/**
* Dashed line weight
* @type {Number}
* @default
*/
weight: 2
},
/**
* Styling for the fixed polyline
* @type {Object}
*/
fixedLine: {
/**
* Solid line color
* @type {String}
* @default
*/
color: '#006',
/**
* Solid line weight
* @type {Number}
* @default
*/
weight: 2
},
/**
* Styling of the midway arrow
* @type {Object}
*/
arrow: {
/**
* Color of the arrow
* @type {String}
* @default
*/
color: '#000'
},
/**
* Style settings for circle marker indicating the starting point of the polyline
* @type {Object}
*/
startCircle: {
/**
* Color of the border of the circle
* @type {String}
* @default
*/
color: '#000',
/**
* Weight of the circle
* @type {Number}
* @default
*/
weight: 1,
/**
* Fill color of the circle
* @type {String}
* @default
*/
fillColor: '#0f0',
/**
* Fill opacity of the circle
* @type {Number}
* @default
*/
fillOpacity: 1,
/**
* Radius of the circle
* @type {Number}
* @default
*/
radius: 3
},
/**
* Style settings for all circle markers between startCircle and endCircle
* @type {Object}
*/
intermedCircle: {
/**
* Color of the border of the circle
* @type {String}
* @default
*/
color: '#000',
/**
* Weight of the circle
* @type {Number}
* @default
*/
weight: 1,
/**
* Fill color of the circle
* @type {String}
* @default
*/
fillColor: '#ff0',
/**
* Fill opacity of the circle
* @type {Number}
* @default
*/
fillOpacity: 1,
/**
* Radius of the circle
* @type {Number}
* @default
*/
radius: 3
},
/**
* Style settings for circle marker indicating the latest point of the polyline during drawing a line
* @type {Object}
*/
currentCircle: {
/**
* Color of the border of the circle
* @type {String}
* @default
*/
color: '#000',
/**
* Weight of the circle
* @type {Number}
* @default
*/
weight: 1,
/**
* Fill color of the circle
* @type {String}
* @default
*/
fillColor: '#f0f',
/**
* Fill opacity of the circle
* @type {Number}
* @default
*/
fillOpacity: 1,
/**
* Radius of the circle
* @type {Number}
* @default
*/
radius: 6
},
/**
* Style settings for circle marker indicating the end point of the polyline
* @type {Object}
*/
endCircle: {
/**
* Color of the border of the circle
* @type {String}
* @default
*/
color: '#000',
/**
* Weight of the circle
* @type {Number}
* @default
*/
weight: 1,
/**
* Fill color of the circle
* @type {String}
* @default
*/
fillColor: '#f00',
/**
* Fill opacity of the circle
* @type {Number}
* @default
*/
fillOpacity: 1,
/**
* Radius of the circle
* @type {Number}
* @default
*/
radius: 3
}
},
_arcpoints: 99, // 99 points = 98 line segments. lower value to make arc less accurate or increase value to make it more accurate.
_circleNr: -1,
_lineNr: -1,
/**
* Create a control button
* @param {String} label Label to add
* @param {String} title Title to show on hover
* @param {Array} classesToAdd Collection of classes to add
* @param {Element} container Parent element
* @param {Function} fn Callback function to run
* @param {Object} context Context
* @returns {Element} Created element
* @private
*/
_createControl: function (label, title, classesToAdd, container, fn, context) {
var anchor = document.createElement('a');
anchor.innerHTML = label;
anchor.setAttribute('title', title);
classesToAdd.forEach(function(c) {
anchor.classList.add(c);
});
L.DomEvent.on (anchor, 'click', fn, context);
container.appendChild(anchor);
return anchor;
},
/**
* Method to fire on add to map
* @param {Object} map Map object
* @returns {Element} Containing element
*/
onAdd: function(map) {
var self = this
// needed to avoid creating points by mouseclick during dragging the map
map.on('movestart ', function() {
self._mapdragging = true
})
this._container = document.createElement('div');
this._container.classList.add('leaflet-bar');
L.DomEvent.disableClickPropagation(this._container); // otherwise drawing process would instantly start at controls' container or double click would zoom-in map
var title = this.options.measureControlTitleOn;
var label = this.options.measureControlLabel;
var classes = this.options.measureControlClasses;
if (label.indexOf('&') != -1) {
classes.push(_unicodeClass);
}
// initialize state
this._arrPolylines = [];
this._measureControl = this._createControl (label, title, classes, this._container, this._toggleMeasure, this);
this._defaultControlBgColor = this._measureControl.style.backgroundColor;
this._measureControl.setAttribute('id', _measureControlId);
if (this.options.showClearControl) {
var title = this.options.clearControlTitle;
var label = this.options.clearControlLabel;
var classes = this.options.clearControlClasses;
if (label.indexOf('&') != -1) {
classes.push(_unicodeClass);
}
this._clearMeasureControl = this._createControl (label, title, classes, this._container, this._clearAllMeasurements, this);
this._clearMeasureControl.classList.add('polyline-measure-clearControl')
}
// There is no point in using the unitControl if there are no units to choose from.
if (this.options.showUnitControl && this.options.unitControlUnits.length > 1) {
var label = this.options.unitControlLabel[this.options.unit];
var title = this.options.unitControlTitle.text + " [" + this.options.unitControlTitle[this.options.unit] + "]";
var classes = this.options.unitControlClasses;
this._unitControl = this._createControl (label, title, classes, this._container, this._changeUnit, this);
this._unitControl.setAttribute ('id', 'unitControlId');
}
return this._container;
},
/**
* Method to fire on remove from map
*/
onRemove: function () {
if (this._measuring) {
this._toggleMeasure();
}
},
// turn off all Leaflet-own events of markers (popups, tooltips). Needed to allow creating points on top of markers
_saveNonpolylineEvents: function () {
this._nonpolylineTargets = this._map._targets;
if (typeof this._polylineTargets !== 'undefined') {
this._map._targets = this._polylineTargets;
} else {
this._map._targets ={};
}
},
// on disabling the measure add-on, save Polyline-measure events and enable the former Leaflet-own events again
_savePolylineEvents: function () {
this._polylineTargets = this._map._targets;
this._map._targets = this._nonpolylineTargets;
},
/**
* Toggle the measure functionality on or off
* @private
*/
_toggleMeasure: function () {
this._measuring = !this._measuring;
if (this._measuring) { // if measuring is going to be switched on
this._mapdragging = false;
this._saveNonpolylineEvents ();
this._measureControl.classList.add ('polyline-measure-controlOnBgColor');
this._measureControl.style.backgroundColor = this.options.backgroundColor;
this._measureControl.title = this.options.measureControlTitleOff;
this._oldCursor = this._map._container.style.cursor; // save former cursor type
this._map._container.style.cursor = 'crosshair';
this._doubleClickZoom = this._map.doubleClickZoom.enabled(); // save former status of doubleClickZoom
this._map.doubleClickZoom.disable();
// create LayerGroup "layerPaint" (only) the first time Measure Control is switched on
if (!this._layerPaint) {
this._layerPaint = L.layerGroup().addTo(this._map);
}
this._map.on ('mousemove', this._mouseMove, this); // enable listing to 'mousemove', 'click', 'keydown' events
this._map.on ('click', this._mouseClick, this);
L.DomEvent.on (document, 'keydown', this._onKeyDown, this);
this._resetPathVariables();
} else { // if measuring is going to be switched off
this._savePolylineEvents ();
this._measureControl.classList.remove ('polyline-measure-controlOnBgColor');
this._measureControl.style.backgroundColor = this._defaultControlBgColor;
this._measureControl.title = this.options.measureControlTitleOn;
this._map._container.style.cursor = this._oldCursor;
this._map.off ('mousemove', this._mouseMove, this);
this._map.off ('click', this._mouseClick, this);
this._map.off ('mousemove', this._resumeFirstpointMousemove, this);
this._map.off ('click', this._resumeFirstpointClick, this);
this._map.off ('mousemove', this._dragCircleMousemove, this);
this._map.off ('mouseup', this._dragCircleMouseup, this);
L.DomEvent.off (document, 'keydown', this._onKeyDown, this);
if(this._doubleClickZoom) {
this._map.doubleClickZoom.enable();
}
if(this.options.clearMeasurementsOnStop && this._layerPaint) {
this._clearAllMeasurements();
}
// to remove temp. Line if line at the moment is being drawn and not finished while clicking the control
if (this._cntCircle !== 0) {
this._finishPolylinePath();
}
}
// allow easy to connect the measure control to the app, f.e. to disable the selection on the map when the measurement is turned on
this._map.fire('polylinemeasure:toggle', { status: this._measuring });
},
/**
* Clear all measurements from the map
*/
_clearAllMeasurements: function() {
if ((this._cntCircle !== undefined) && (this._cntCircle !== 0)) {
this._finishPolylinePath();
}
if (this._layerPaint) {
this._layerPaint.clearLayers();
}
this._arrPolylines = [];
this._map.fire('polylinemeasure:clear');
},
_changeUnit: function() {
// Retrieve the index of the next available unit of measurement.
let indexCurrUnit = this.options.unitControlUnits.indexOf(this.options.unit);
let indexNextUnit = (indexCurrUnit+1)%this.options.unitControlUnits.length;
// Update the unit of measurement.
this.options.unit = this.options.unitControlUnits[indexNextUnit];
this._unitControl.innerHTML = this.options.unitControlLabel[this.options.unit];
this._unitControl.title = this.options.unitControlTitle.text +" [" + this.options.unitControlTitle[this.options.unit] + "]";
if (this._currentLine) {
this._computeDistance(this._currentLine);
}
this._arrPolylines.map (this._computeDistance.bind(this));
},
_computeDistance: function(line) {
var totalDistance = 0;
line.circleCoords.map (function(point, point_index) {
if (point_index >= 1) {
var distance = line.circleCoords [point_index - 1].distanceTo (line.circleCoords [point_index]);
totalDistance += distance;
this._updateTooltip (line.tooltips [point_index], line.tooltips [point_index - 1], totalDistance, distance, line.circleCoords [point_index - 1], line.circleCoords [point_index]);
}
}.bind(this));
},
/**
* Event to fire when a keyboard key is depressed.
* Currently only watching for ESC key (= keyCode 27). 1st press finishes line, 2nd press turns Measuring off.
* @param {Object} e Event
* @private
*/
_onKeyDown: function (e) {
if (e.keyCode === 27) {
// if resuming a line at its first point is active
if (this._resumeFirstpointFlag === true) {
this._resumeFirstpointFlag = false;
var lineNr = this._lineNr;
this._map.off ('mousemove', this._resumeFirstpointMousemove, this);
this._map.off ('click', this._resumeFirstpointClick, this);
this._layerPaint.removeLayer (this._rubberlinePath2);
this._layerPaint.removeLayer (this._tooltipNew);
this._arrPolylines[lineNr].circleMarkers [0].setStyle (this.options.startCircle);
var text = '';
var totalDistance = 0;
if (this.options.showBearings === true) {
text = this.options.bearingTextIn+':---°<br>'+this.options.bearingTextOut+':---°';
}
text = text + '<div class="polyline-measure-tooltip-difference">+' + '0</div>';
text = text + '<div class="polyline-measure-tooltip-total">' + '0</div>';
this._arrPolylines[lineNr].tooltips [0]._icon.innerHTML = text;
this._arrPolylines[lineNr].tooltips.map (function (item, index) {
if (index >= 1) {
var distance = this._arrPolylines[lineNr].circleCoords[index-1].distanceTo (this._arrPolylines[lineNr].circleCoords[index]);
var lastCircleCoords = this._arrPolylines[lineNr].circleCoords[index - 1];
var mouseCoords = this._arrPolylines[lineNr].circleCoords[index];
totalDistance += distance;
var prevTooltip = this._arrPolylines[lineNr].tooltips[index-1]
this._updateTooltip (item, prevTooltip, totalDistance, distance, lastCircleCoords, mouseCoords);
}
}.bind (this));
this._map.on ('mousemove', this._mouseMove, this);
return
}
if (!this._currentLine) { // if NOT drawing a line, ESC will directly switch of measuring
this._toggleMeasure();
} else { // if drawing a line, ESC will finish the current line
this._finishPolylinePath(e);
}
}
},
/**
* Get the distance in the format specified in the options
* @param {Number} distance Distance to convert
* @returns {{value: *, unit: *}}
* @private
*/
_getDistance: function (distance) {
var dist = distance;
var unit;
if (this.options.unit === 'nauticalmiles') {
unit = this.options.unitControlLabel.nauticalmiles;
if (dist >= 185200) {
dist = (dist/1852).toFixed(0);
} else if (dist >= 18520) {
dist = (dist/1852).toFixed(1);
} else if (dist >= 1852) {
dist = (dist/1852).toFixed(2);
} else {
dist = (dist/1852).toFixed(3); // there's no subunit of Nautical Miles for horizontal length measurements. "Cable length" (1/10th of 1 nm) is rarely used
}
} else if (this.options.unit === 'landmiles') {
unit = this.options.unitControlLabel.landmiles;
if (dist >= 160934.4) {
dist = (dist/1609.344).toFixed(0);
} else if (dist >= 16093.44) {
dist = (dist/1609.344).toFixed(1);
} else if (dist >= 1609.344) {
dist = (dist/1609.344).toFixed(2);
} else {
if (!this.options.useSubunits) {
dist = (dist/1609.344).toFixed(4);
} else {
dist = (dist/0.3048).toFixed(0);
unit = this.options.unitControlLabel.feet;
}
}
}
else {
unit = this.options.unitControlLabel.kilometres;
if (dist >= 100000) {
dist = (dist/1000).toFixed(0);
} else if (dist >= 10000) {
dist = (dist/1000).toFixed(1);
} else if (dist >= 1000) {
dist = (dist/1000).toFixed(2);
} else {
if (!this.options.useSubunits) {
dist = (dist/1000).toFixed(4);
} else {
dist = (dist).toFixed(1);
unit = this.options.unitControlLabel.metres;
}
}
}
return {value:dist, unit:unit};
},
/**
* Calculate Great-circle Arc (= shortest distance on a sphere like the Earth) between two coordinates
* formulas: http://www.edwilliams.org/avform.htm
* @private
*/
_polylineArc: function (_from, _to) {
function _GCinterpolate (f) {
var A = Math.sin((1 - f) * d) / Math.sin(d);
var B = Math.sin(f * d) / Math.sin(d);
var x = A * Math.cos(fromLat) * Math.cos(fromLng) + B * Math.cos(toLat) * Math.cos(toLng);
var y = A * Math.cos(fromLat) * Math.sin(fromLng) + B * Math.cos(toLat) * Math.sin(toLng);
var z = A * Math.sin(fromLat) + B * Math.sin(toLat);
// atan2 better than atan-function cause results are from -pi to +pi
// => results of latInterpol, lngInterpol always within range -180° ... +180° => conversion into values < -180° or > + 180° has to be done afterwards
var latInterpol = 180 / Math.PI * Math.atan2(z, Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2)));
var lngInterpol = 180 / Math.PI * Math.atan2(y, x);
// don't split polyline if it crosses dateline ( -180° or +180°). Without the polyline would look like: +179° ==> +180° ==> -180° ==> -179°...
// algo: if difference lngInterpol-from.lng is > 180° there's been an unwanted split from +180 to -180 cause an arc can never span >180°
var diff = lngInterpol-fromLng*180/Math.PI;
function trunc(n) { return Math[n > 0 ? "floor" : "ceil"](n); } // alternatively we could use the new Math.trunc method, but Internet Explorer doesn't know it
if (diff < 0) {
lngInterpol = lngInterpol - trunc ((diff - 180)/ 360) * 360;
} else {
lngInterpol = lngInterpol - trunc ((diff +180)/ 360) * 360;
}
return [latInterpol, lngInterpol];
}
function _GCarc (npoints) {
var arrArcCoords = [];
var delta = 1.0 / (npoints-1 );
// first point of Arc should NOT be returned
for (var i = 0; i < npoints; i++) {
var step = delta * i;
var coordPair = _GCinterpolate (step);
arrArcCoords.push (coordPair);
}
return arrArcCoords;
}
var fromLat = _from.lat; // work with with copies of object's elements _from.lat and _from.lng, otherwise they would get modiefied due to call-by-reference on Objects in Javascript
var fromLng = _from.lng;
var toLat = _to.lat;
var toLng = _to.lng;
fromLat=fromLat * Math.PI / 180;
fromLng=fromLng * Math.PI / 180;
toLat=toLat * Math.PI / 180;
toLng=toLng * Math.PI / 180;
var d = 2.0 * Math.asin(Math.sqrt(Math.pow (Math.sin((fromLat - toLat) / 2.0), 2) + Math.cos(fromLat) * Math.cos(toLat) * Math.pow(Math.sin((fromLng - toLng) / 2.0), 2)));
var arrLatLngs;
if (d === 0) {
arrLatLngs = [[fromLat, fromLng]];
} else {
arrLatLngs = _GCarc(this._arcpoints);
}
return arrLatLngs;
},
/**
* Update the tooltip distance
* @param {Number} total Total distance
* @param {Number} difference Difference in distance between 2 points
* @private
*/
_updateTooltip: function (currentTooltip, prevTooltip, total, difference, lastCircleCoords, mouseCoords) {
// Explanation of formula: http://www.movable-type.co.uk/scripts/latlong.html
var calcAngle = function (p1, p2, direction) {
var lat1 = p1.lat / 180 * Math.PI;
var lat2 = p2.lat / 180 * Math.PI;
var lng1 = p1.lng / 180 * Math.PI;
var lng2 = p2.lng / 180 * Math.PI;
var y = Math.sin(lng2-lng1) * Math.cos(lat2);
var x = Math.cos(lat1)*Math.sin(lat2) - Math.sin(lat1)*Math.cos(lat2)*Math.cos(lng2-lng1);
if (direction === "inbound") {
var brng = (Math.atan2(y, x) * 180 / Math.PI + 180).toFixed(0);
} else {
var brng = (Math.atan2(y, x) * 180 / Math.PI + 360).toFixed(0);
}
return (brng % 360);
}
var angleIn = calcAngle (mouseCoords, lastCircleCoords, "inbound");
var angleOut = calcAngle (lastCircleCoords, mouseCoords, "outbound");
var totalRound = this._getDistance (total);
var differenceRound = this._getDistance (difference);
var textCurrent = '';
if (differenceRound.value > 0 ) {
if (this.options.showBearings === true) {
textCurrent = this.options.bearingTextIn + ': ' + angleIn + '°<br>'+this.options.bearingTextOut+':---°';
}
textCurrent += '<div class="polyline-measure-tooltip-difference">+' + differenceRound.value + ' ' + differenceRound.unit + '</div>';
}
textCurrent += '<div class="polyline-measure-tooltip-total">' + totalRound.value + ' ' + totalRound.unit + '</div>';
currentTooltip._icon.innerHTML = textCurrent;
if ((this.options.showBearings === true) && (prevTooltip)) {
var textPrev = prevTooltip._icon.innerHTML;
var regExp = new RegExp(this.options.bearingTextOut + '.*\°');
var textReplace = textPrev.replace(regExp, this.options.bearingTextOut + ': ' + angleOut + "°");
prevTooltip._icon.innerHTML = textReplace;
}
},
_drawArrow: function (arcLine) {
// center of Great-circle distance, NOT of the arc on a Mercator map! reason: a) to complicated b) map not always Mercator c) good optical feature to see where real center of distance is not the "virtual" warped arc center due to Mercator projection
// differ between even and odd pointed Arcs. If even the arrow is in the center of the middle line-segment, if odd it is on the middle point
var midpoint = Math.trunc(arcLine.length/2);
if (arcLine.length % 2 == 0) {
var P1 = arcLine[midpoint-1];
var P2 = arcLine[midpoint];
var diffLng12 = P2[1] - P1[1];
var diffLat12 = P2[0] - P1[0];
var center = [P1[0] + diffLat12/2, P1[1] + diffLng12/2];
} else {
var P1 = arcLine[midpoint-1];
var P2 = arcLine[midpoint+1];
var diffLng12 = P2[1] - P1[1];
var diffLat12 = P2[0] - P1[0];
var center = arcLine[midpoint];
}
// angle just an aprroximation, which could be somewhat off if Line runs near high latitudes. Use of *geographical coords* for line segment P1 to P2 is best method. Use of *Pixel coords* for just one arc segement P1 to P2 could create for short lines unexact rotation angles, and the use Use of Pixel coords between endpoints [0] to [98] (in case of 99-point-arc) results in even more rotation difference for high latitudes as with geogrpaphical coords-method
var cssAngle = -Math.atan2(diffLat12, diffLng12)*57.29578 // convert radiant to degree as needed for use as CSS value; cssAngle is opposite to mathematical angle.
var iconArrow = L.divIcon ({
className: "", // to avoid getting a default class with paddings and borders assigned by Leaflet
iconSize: [16, 16],
iconAnchor: [8, 8],
// html : "<img src='iconArrow.png' style='background:green; height:100%; vertical-align:top; transform:rotate("+ cssAngle +"deg)'>" <<=== alternative method by the use of an image instead of a Unicode symbol.
html : "<div style = 'color:" + this.options.arrow.color + "; font-size: 16px; line-height: 16px; vertical-align:top; transform: rotate("+ cssAngle +"deg)'>➤</div>" // best results if iconSize = font-size = line-height and iconAnchor font-size/2 .both values needed to position symbol in center of L.divIcon for all font-sizes.
});
var newArrowMarker = L.marker (center, {icon: iconArrow, zIndexOffset:-50}).addTo(this._layerPaint); // zIndexOffset to draw arrows below tooltips
if (!this._currentLine){ // just bind tooltip if not drawing line anymore, cause following the instruction of tooltip is just possible when not drawing a line
newArrowMarker.bindTooltip (this.options.tooltipTextAdd, {direction:'top', opacity:0.7, className:'polyline-measure-popupTooltip'});
}
newArrowMarker.on ('click', this._clickedArrow, this);
return newArrowMarker;
},
/**
* Event to fire on mouse move
* @param {Object} e Event
* @private
*/
_mouseMove: function (e) {
var mouseCoords = e.latlng;
this._map.on ('click', this._mouseClick, this); // necassary for _dragCircle. If switched on already within _dragCircle an unwanted click is fired at the end of the drag.
if(!mouseCoords || !this._currentLine) {
return;
}
var lastCircleCoords = this._currentLine.circleCoords.last();
this._rubberlinePath.setLatLngs (this._polylineArc (lastCircleCoords, mouseCoords));
var currentTooltip = this._currentLine.tooltips.last();
var prevTooltip = this._currentLine.tooltips.slice(-2,-1)[0];
currentTooltip.setLatLng (mouseCoords);
var distanceSegment = mouseCoords.distanceTo (lastCircleCoords);
this._updateTooltip (currentTooltip, prevTooltip, this._currentLine.distance + distanceSegment, distanceSegment, lastCircleCoords, mouseCoords);
},
_startLine: function (clickCoords) {
var icon = L.divIcon({
className: 'polyline-measure-tooltip',
iconAnchor: [-4, -4]
});
var last = function() {
return this.slice(-1)[0];
};
this._rubberlinePath = L.polyline ([], {
// Style of temporary, dashed line while moving the mouse
color: this.options.tempLine.color,
weight: this.options.tempLine.weight,
interactive: false,
dashArray: '8,8'
}).addTo(this._layerPaint).bringToBack();
var polylineState = this; // use "polylineState" instead of "this" to allow measuring on 2 different maps the same time
this._currentLine = {
id: 0,
circleCoords: [],
circleMarkers: [],
arrowMarkers: [],
tooltips: [],
distance: 0,
polylinePath: L.polyline([], {
// Style of fixed, polyline after mouse is clicked
color: this.options.fixedLine.color,
weight: this.options.fixedLine.weight,
interactive: false
}).addTo(this._layerPaint).bringToBack(),
handleMarkers: function (latlng) {
// update style on previous marker
var lastCircleMarker = this.circleMarkers.last();
if (lastCircleMarker) {
lastCircleMarker.bindTooltip (polylineState.options.tooltipTextDelete, {direction:'top', opacity:0.7, className:'polyline-measure-popupTooltip'});
lastCircleMarker.off ('click', polylineState._finishPolylinePath, polylineState);
if (this.circleMarkers.length === 1) {
lastCircleMarker.setStyle (polylineState.options.startCircle);
} else {
lastCircleMarker.setStyle (polylineState.options.intermedCircle);
}
}
var newCircleMarker = new L.CircleMarker (latlng, polylineState.options.currentCircle).addTo(polylineState._layerPaint);
newCircleMarker.bindTooltip (polylineState.options.tooltipTextFinish + polylineState.options.tooltipTextDelete, {direction:'top', opacity:0.7, className:'polyline-measure-popupTooltip'});
newCircleMarker.cntLine = polylineState._currentLine.id;
newCircleMarker.cntCircle = polylineState._cntCircle;
polylineState._cntCircle++;
newCircleMarker.on ('mousedown', polylineState._dragCircle, polylineState);
newCircleMarker.on ('click', polylineState._finishPolylinePath, polylineState);
this.circleMarkers.push (newCircleMarker);
},
getNewToolTip: function(latlng) {
return L.marker (latlng, {
icon: icon,
interactive: false
});
},
addPoint: function (mouseCoords) {
var lastCircleCoords = this.circleCoords.last();
if (lastCircleCoords && lastCircleCoords.equals (mouseCoords)) { // don't add a new circle if the click was onto the last circle
return;
}
this.circleCoords.push (mouseCoords);
// update polyline
if (this.circleCoords.length > 1) {
var arc = polylineState._polylineArc (lastCircleCoords, mouseCoords);
var arrowMarker = polylineState._drawArrow (arc);
if (this.circleCoords.length > 2) {
arc.shift(); // remove first coordinate of the arc, cause it is identical with last coordinate of previous arc
}
this.polylinePath.setLatLngs (this.polylinePath.getLatLngs().concat(arc));
// following lines needed especially for Mobile Browsers where we just use mouseclicks. No mousemoves, no tempLine.
arrowMarker.cntLine = polylineState._currentLine.id;
arrowMarker.cntArrow = polylineState._cntCircle - 1;
polylineState._currentLine.arrowMarkers.push (arrowMarker);
var distanceSegment = lastCircleCoords.distanceTo (mouseCoords);
this.distance += distanceSegment;
var currentTooltip = polylineState._currentLine.tooltips.last();
var prevTooltip = polylineState._currentLine.tooltips.slice(-1,-2)[0];
polylineState._updateTooltip (currentTooltip, prevTooltip, this.distance, distanceSegment, lastCircleCoords, mouseCoords);
}
// update last tooltip with final value
if (currentTooltip) {
currentTooltip.setLatLng (mouseCoords);
}
// add new tooltip to update on mousemove
var tooltipNew = this.getNewToolTip(mouseCoords);
tooltipNew.addTo(polylineState._layerPaint);
this.tooltips.push (tooltipNew);
this.handleMarkers (mouseCoords);
},
finalize: function() {
// remove tooltip created by last click
polylineState._layerPaint.removeLayer (this.tooltips.last());
this.tooltips.pop();
// remove temporary rubberline
polylineState._layerPaint.removeLayer (polylineState._rubberlinePath);
if (this.circleCoords.length > 1) {
this.tooltips.last()._icon.classList.add('polyline-measure-tooltip-end'); // add Class e.g. another background-color to the Previous Tooltip (which is the last fixed tooltip, cause the moving tooltip is being deleted later)
var lastCircleMarker = this.circleMarkers.last()
lastCircleMarker.setStyle (polylineState.options.endCircle);
// use Leaflet's own tooltip method to shwo a popuo tooltip if user hovers the last circle of a polyline
lastCircleMarker.unbindTooltip (); // to close the opened Tooltip after it's been opened after click onto point to finish the line
polylineState._currentLine.circleMarkers.map (function (circle) {circle.bindTooltip (polylineState.options.tooltipTextMove + polylineState.options.tooltipTextDelete, {direction:'top', opacity:0.7, className:'polyline-measure-popupTooltip'})});
polylineState._currentLine.circleMarkers[0].bindTooltip (polylineState.options.tooltipTextMove + polylineState.options.tooltipTextDelete + polylineState.options.tooltipTextResume, {direction:'top', opacity:0.7, className:'polyline-measure-popupTooltip'});
lastCircleMarker.bindTooltip (polylineState.options.tooltipTextMove + polylineState.options.tooltipTextDelete + polylineState.options.tooltipTextResume, {direction:'top', opacity:0.7, className:'polyline-measure-popupTooltip'});
polylineState._currentLine.arrowMarkers.map (function (arrow) {arrow.bindTooltip (polylineState.options.tooltipTextAdd, {direction:'top', opacity:0.7, className:'polyline-measure-popupTooltip'})});
lastCircleMarker.off ('click', polylineState._finishPolylinePath, polylineState);
lastCircleMarker.on ('click', polylineState._resumePolylinePath, polylineState);
polylineState._arrPolylines [this.id] = this;
} else {
// if there is only one point, just clean it up
polylineState._layerPaint.removeLayer (this.circleMarkers.last());
polylineState._layerPaint.removeLayer (this.tooltips.last());
}
polylineState._resetPathVariables();
}
};
var firstTooltip = L.marker (clickCoords, {
icon: icon,
interactive: false
})
firstTooltip.addTo(this._layerPaint);
var text = '';
if (this.options.showBearings === true) {
text = this.options.bearingTextIn+':---°<br>'+this.options.bearingTextOut+':---°';
}
text = text + '<div class="polyline-measure-tooltip-difference">+' + '0</div>';
text = text + '<div class="polyline-measure-tooltip-total">' + '0</div>';
firstTooltip._icon.innerHTML = text;
this._currentLine.tooltips.push (firstTooltip);
this._currentLine.circleCoords.last = last;
this._currentLine.tooltips.last = last;
this._currentLine.circleMarkers.last = last;
this._currentLine.id = this._arrPolylines.length;
},
/**
* Event to fire on mouse click
* @param {Object} e Event
* @private
*/
_mouseClick: function (e) {
// skip if there are no coords provided by the event, or this event's screen coordinates match those of finishing CircleMarker for the line we just completed
if (!e.latlng || (this._finishCircleScreencoords && this._finishCircleScreencoords.equals(e.containerPoint))) {
return;
}
if (!this._currentLine && !this._mapdragging) {
this._startLine (e.latlng);
this._map.fire('polylinemeasure:start', this._currentLine);
}
// just create a point if the map isn't dragged during the mouseclick.
if (!this._mapdragging) {
this._currentLine.addPoint (e.latlng);
this._map.fire('polylinemeasure:add', e);
this._map.fire('polylinemeasure:change', this._currentLine);
} else {
this._mapdragging = false; // this manual setting to "false" needed, instead of a "moveend"-Event. Cause the mouseclick of a "moveend"-event immediately would create a point too the same time.
}
},
/**
* Finish the drawing of the path by clicking onto the last circle or pressing ESC-Key