Leaflet changing Marker color

问题:

Is there a way to randomly change marker-colors in native Leaflet? I'm using svg elements which could be styled. I know that it is possible with mapbox.js

EDIT: To clarify what I intend to do: If you add markers to the map via a doubleclick or something it should have random colors. To achieve this I wanted to use svg icons for the markers to style them.

This is my code:

myIcon = L.icon({
  iconUrl: "icon_33997.svg",
  iconAnchor: pinAnchor
});

newMarker = L.marker(lat, long], {
  icon: myIcon
});

回答1:

So this is one of the top hits in Google for styling Leaflet Icon, but it didn't have a solution that worked without third parties, and I was having this problem in React as we needed dynamic colours for our routes and icons.

The solution I came up with was to use Leaflet.DivIcon html attribute, it allows you to pass a string which is evaluated into a DOM element.

So for example I created a marker style follows:

const myCustomColour = '#583470'

const markerHtmlStyles = `
  background-color: ${myCustomColour};
  width: 3rem;
  height: 3rem;
  display: block;
  left: -1.5rem;
  top: -1.5rem;
  position: relative;
  border-radius: 3rem 3rem 0;
  transform: rotate(45deg);
  border: 1px solid #FFFFFF`

const icon = Leaflet.divIcon({
  className: "my-custom-pin",
  iconAnchor: [0, 24],
  labelAnchor: [-6, 0],
  popupAnchor: [0, -36],
  html: `<span style="${markerHtmlStyles}" />`
})

Change background-color in markerHtmlStyles to your custom colour and you're good to go.

回答2:

Bind in the icons from this site!

https://github.com/pointhi/leaflet-color-markers

Detailed how-to information included on the website.

回答3:

Leaflet Markers are stored as files unlike other objects (like Polylines, etc.)

If you want your own markers, you can find The official Leaflet Tutorial that explains how to do it.

EDIT :

After reading this conversation with the main developer I searched for the marker SVG and here it is.

With this you should be able to color the marker the way you want and randomly set their color.

EDIT AGAIN :

You can use MakiMarkers to set the color of a marker and use this extension to make some random stuffs. (It's simple and well explained)

回答4:

Since you are working with svg elements you could feed your leaflet marker's icon with L.divIcon's html property instead of using iconUrl from L.icon to link your image.

L.marker(latlng, {
    icon: L.divIcon({
        className: 'ship-div-icon',
        html: '<svg>...</svg>'
    })
}).addTo(map);

Then use CSS fill property to color your svg shape. It could be useful to add a class\es to svg's path\s to have precise control

<svg ... >
    <g>
        <path class="ship-icon" ... />
    </g>
    ...
</svg>

At the end, as I also needed to randomly change the marker color I changed directly the path's fill property at the time of creating the marker

var pathFillColor = '#'+(Math.random()*0xFFFFFF<<0).toString(16);

L.marker(latlng, {
    icon: L.divIcon({
        className: 'ship-div-icon',
        html: '<svg ... ><g><path fill="'+pathFillColor+'" ... /> </g></svg>'
    })
}).addTo(map);

回答5:

Try the Leaflet.awesome-markers lib -- it allows you to set colors and other styles.

回答6:

Ahh an event listener and change the icon through setIcon() method:

createdMarker.on("dblclick", function(evt) {

        var myIcon = L.icon({
            iconUrl: 'res/marker-icon-red.png',
            shadowUrl: 'res/marker-shadow.png'
        });
        this.setIcon(myIcon);
});

回答7:

You can also use the Google Charts API to get icons (just change 'abcdef' with the hexadecimal color you want:

Examples:

• Color '#abcdef':
  • URL: http://chart.apis.google.com/chart?chst=d_map_pin_letter&chld=%E2%80%A2|abcdef&chf=a,s,ee00FFFF
  • Output:
• Color '#e85141':
  • URL: http://chart.apis.google.com/chart?chst=d_map_pin_letter&chld=%E2%80%A2|e85141&chf=a,s,ee00FFFF
  • Output:
• Color '#2ecc71':
  • URL: http://chart.apis.google.com/chart?chst=d_map_pin_letter&chld=%E2%80%A2|2ecc71&chf=a,s,ee00FFFF
  • Output:

回答8:

Here is the SVG of the icon.

<svg width="28" height="41" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
 <defs>
  <linearGradient id="b">
   <stop stop-color="#2e6c97" offset="0"/>
   <stop stop-color="#3883b7" offset="1"/>
  </linearGradient>
  <linearGradient id="a">
   <stop stop-color="#126fc6" offset="0"/>
   <stop stop-color="#4c9cd1" offset="1"/>
  </linearGradient>
  <linearGradient y2="-0.004651" x2="0.498125" y1="0.971494" x1="0.498125" id="c" xlink:href="#a"/>
  <linearGradient y2="-0.004651" x2="0.415917" y1="0.490437" x1="0.415917" id="d" xlink:href="#b"/>
 </defs>
 <g>
  <title>Layer 1</title>
  <rect id="svg_1" fill="#fff" width="12.625" height="14.5" x="411.279" y="508.575"/>
  <path stroke="url(#d)" id="svg_2" stroke-linecap="round" stroke-width="1.1" fill="url(#c)" d="m14.095833,1.55c-6.846875,0 -12.545833,5.691 -12.545833,11.866c0,2.778 1.629167,6.308 2.80625,8.746l9.69375,17.872l9.647916,-17.872c1.177083,-2.438 2.852083,-5.791 2.852083,-8.746c0,-6.175 -5.607291,-11.866 -12.454166,-11.866zm0,7.155c2.691667,0.017 4.873958,2.122 4.873958,4.71s-2.182292,4.663 -4.873958,4.679c-2.691667,-0.017 -4.873958,-2.09 -4.873958,-4.679c0,-2.588 2.182292,-4.693 4.873958,-4.71z"/>
  <path id="svg_3" fill="none" stroke-opacity="0.122" stroke-linecap="round" stroke-width="1.1" stroke="#fff" d="m347.488007,453.719c-5.944,0 -10.938,5.219 -10.938,10.75c0,2.359 1.443,5.832 2.563,8.25l0.031,0.031l8.313,15.969l8.25,-15.969l0.031,-0.031c1.135,-2.448 2.625,-5.706 2.625,-8.25c0,-5.538 -4.931,-10.75 -10.875,-10.75zm0,4.969c3.168,0.021 5.781,2.601 5.781,5.781c0,3.18 -2.613,5.761 -5.781,5.781c-3.168,-0.02 -5.75,-2.61 -5.75,-5.781c0,-3.172 2.582,-5.761 5.75,-5.781z"/>
 </g>
</svg>

回答9:

I found the SVG marker/icon to be best one yet. It is very flexible and allows any color you like. You can customize the entire icon without much of a hassle:

function createIcon(markerColor) {
  /* ...Code ommitted ... */

  return new L.DivIcon.SVGIcon({
            color: markerColor,
            iconSize: [15,30],
            circleRatio: 0.35
  });
}

回答10:

In R, use the addAwesomeMarkers() function. Sample code producing red marker:

leaflet() %>%
addTiles() %>%
addAwesomeMarkers(lng = -77.03654, lat = 38.8973, icon = awesomeIcons(icon = 'ion-ionic', library = 'ion', markerColor = 'red'))

Link for ion icons: http://ionicons.com/

回答11:

Write a function which, given a color (or any other characteristics), returns an SVG representation of the desired icon. Then, when creating the marker, reference this function with the appropriate parameter(s).

回答12:

adding to @tutts excelent answer, I modified it to this:

... includes a caption - where you can use FontAwesome icons or alike ...

var myCustomColour = '#334455d0', // d0 -> alpha value
    lat = 5.5,
    lon = 5.5;

var caption = '', // '<i class="fa fa-eye" />' or 'abc' or ...
    size = 10,    // size of the marker
    border = 2;   // border thickness

var markerHtmlStyles = ' \
    background-color: ' + myCustomColour + '; \
    width: '+ (size * 3) +'px; \
    height: '+ (size * 3) +'px; \
    display: block; \
    left: '+ (size * -1.5) +'px; \
    top: '+ (size * -1.5) +'px; \
    position: relative; \
    border-radius: '+ (size * 3) +'px '+ (size * 3) +'px 0; \
    transform: rotate(45deg); \
    border: '+border+'px solid #FFFFFF;\
    ';

var captionStyles = '\
    transform: rotate(-45deg); \
    display:block; \
    width: '+ (size * 3) +'px; \
    text-align: center; \
    line-height: '+ (size * 3) +'px; \
    ';

var icon = L.divIcon({
    className: "color-pin-" + myCustomColour.replace('#', ''),

    // on another project this is needed: [0, size*2 + border/2]
    iconAnchor: [border, size*2 + border*2], 

    labelAnchor: [-(size/2), 0],
    popupAnchor: [0, -(size*3 + border)],
    html: '<span style="' + markerHtmlStyles + '"><span style="'+captionStyles+'">'+ caption + '</span></span>'
});

var marker = L.marker([lat, lon], {icon: icon})
.addTo(mymap);

and the ES6 version (like @tutts) .. I am using it with vue-leaflet

// caption could be: '<i class="fa fa-eye" />',
function makeMarkerIcon(color, caption) {
	let myCustomColour = color + 'd0';

	let size = 10,    // size of the marker
		border = 2;   // border thickness

	let markerHtmlStyles = `
		background-color: ${myCustomColour};
		width: ${size * 3}px;
		height: ${size * 3}px;
		display: block;
		left: ${size * -1.5}px;
		top: ${size * -1.5}px;
		position: relative;
		border-radius: ${size * 3}px ${size * 3}px 0;
		transform: rotate(45deg);
		border: ${border}px solid #FFFFFF;
		`;

	let captionStyles = `
		transform: rotate(-45deg);
		display:block;
		width: ${size * 3}px;
		text-align: center;
		line-height: ${size * 3}px;
		`;

	let icon = L.divIcon({
		className: 'color-pin-' + myCustomColour.replace('#', ''),
		iconAnchor: [border, size*2 + border*2],
		labelAnchor: [-(size/2), 0],
		popupAnchor: [0, -(size*3 + border)],

		html: `<span style="${markerHtmlStyles}"><span style="${captionStyles}">${caption || ''}</span></span>`
	});

	return icon;
}

var marker = L.marker([lat, lon], {icon: makeMarkerIcon('#123456d0', '?')})
.addTo(mymap);

回答13:

In addition to the way @guillermogfer describe, this is the way to do it if you don't want to paste your whole svg code into your react component. You can just place your svg code in a separate file and load it into your code file as a React Component like this:

import { ReactComponent as SatelliteIcon } from "../assets/icons/satellite.svg";

After you do this you can just use your svg as if it is a react component, so like this:

<SatelliteIcon className="svg-icon light-blue" />

What we ended up doing is define some standard svg colors that are used in our application so we can pass them as a class in order to change the color of the svg. If you don't know the color beforehand or don't have a defined set of colors you can dynamically overwrite the properties in your svg file by using the style attribute, something like this:

<SatelliteIcon style={{ stroke: "black" }}/>

In order for this to work it is important that the attributes you are trying to overwrite are set on the element in your svg and not on the individual paths.

In order to get this svg icon to display in leaflet you can use the divIcon as described by @guillermogfer. However, because the html attribute of the divIcon doesn't understand jsx we need to convert it to string first:

L.divIcon({
    className: 'div-icon',
    html: ReactDOMServer.renderToString(
        <SatelliteIcon className="svg-icon light-blue" />
    )
})

回答14:

1) Add the marker 2) find the backgroundcolor attribute for the css and change it. Here it is:
JS

var myIcon = L.divIcon({
      className: 'my-div-icon',
      iconSize: [5, 5]
    });
var marker = L.marker([50,-20], {icon: myIcon}).addTo(map);
    marker.valueOf()._icon.style.backgroundColor = 'green'; //or any color