Leaflet-SVGIcon
L.DivIcon.SVGIcon is a simple and customizable SVG marker icon with no external library or file dependencies. By default, 1 emoji, 2 characters of text or about 3 numerals can fit inside the icon's inner circle.
Also included is L.Marker.SVGMarker, a small Marker wrapper class for SVGIcons with a setStyle implementation that handles marker opacity changes, monochromatic color changes and changes to specific icon options.
There are also 2 example subclasses provided. One is rhombus shaped and includes an example SVGMarker subclass specific to this icon. The other is shaped like the Washington Monument.
Requirements
- Leaflet 0.7+ (earlier versions may work, but are untested)
- Browser support for SVG
Demo
The following example is centered on the Washington Monument and allows for the manipulation of all icon options. The default options are shown as placeholder text. The icon can also be changed to either of the example subclasses.
Usage
- Include the source file
<script src="svg-icon.js"></script>- Use an SVGMarker
var marker = new L.Marker.SVGMarker(latlng)- Use an SVGMarker with customized icon options
var marker = new L.Marker.SVGMarker(latlng, { iconOptions: { color: "rgb(0,0,100)" }})- Use any place Icons are accepted
var marker = new L.Marker(latlng, { icon: new L.DivIcon.SVGIcon() })Properties
L.DivIcon.SVGIcon
Unspecified Icon options are ignored
| Option | Type | Default | Description |
|---|---|---|---|
| circleText | String | "" | Text to include in the center of the icon |
| className | String | "svg-icon" | Class prefix to use for icon elements |
| circleAnchor | Point | [iconSize.x/2, iconSize.x/2] | Point of origin for the icon's inner circle |
| circleColor | String | same as "color" | Color of the icon's inner circle border |
| circleOpacity | Number | same as "opacity" | Opacity of the icon's inner circle border |
| circleFillColor | String | "rgb(255,255,255)" | Color of the icon's inner circle interior |
| circleFillOpacity | Number | same as "opacity" | Opacity of the icon's inner circle interior |
| circleRatio | Number | 0.5 | Ratio of the width of the icon's inner circle to the width of the marker. Set to 0 to disable circle |
| circleWeight | Number | same as "weight" | Width of the icon's inner circle border |
| color | String | "rgb(0,102,255)" | Color of the icon's border |
| fillColor | String | same as "color" | Color of the icon's interior |
| fillOpacity | Number | 0.4 | Opacity of the icon's interior |
| fontColor | String | "rgb(0,0,0)" | Color of the icon's center text |
| fontOpacity | Number | 1 | Opacity of the icon's center text |
| fontSize | Number | iconSize.x/4 | Font size in pixels of the icon's center text |
| iconAnchor | Point | [iconSize.x/2, iconSize.y] | The point to align over the marker's geographic location |
| iconSize | Point | [32,48] | The size of the icon |
| opacity | Number | 1 | Opacity of the icon's border |
| popupAnchor | Point | [0,(-0.75*iconSize.y)] | Point of origin for bound popups relative to the iconAnchor |
L.Marker.SVGMarker
All standard L.Marker options are supported excluding icon. To customize the icon, pass a dictionary of icon options using the iconOptions SVGMarker option. There is an example in the Usage section.
| Option | Type | Default | Description |
|---|---|---|---|
| iconFactory | method | L.divIcon.svgIcon | The factory method to use when creating the SVGIcon. Only useful for SVGIcon subclasses |
| iconOptions | Dictionary | {} | A dictionary of icon options to pass |
Methods
L.DivIcon.SVGIcon
This class does not include any methods that are intended to be user accessible as part of normal use. The following are the internal methods used to generate the icon. All methods with the exception of _createPathDescription are customizable using icon options only. Due to the computations inherent in creating a scalable path description, _createPathDescription must be overridden in order to change the overall icon shape.
_createCircle()
Creates the icon's inner circle. This method is 100% customizable using icon options exclusively, and should not need to be overridden in most cases.
_createPath()
Creates the main body of the icon. All aspects of the icon body with the exception of the shape itself may be customized used icon options.
_createPathDescription()
Creates the drawing instructions for the icon's shape. This method must be overridden in order to change the icon's shape. See the Advanced Customization section for more information.
_createSVG()
Creates the final SVG element. This method should not need to be overridden. Note that if adding HTML elements, they need to be placed outside the main element.
_createText()
Creates the SVG text element. More text can be fit without overriding this method by increasing the size of the icon and specifying a font size.
L.Marker.SVGMarker
setStyle(style)
This method supports three style values:
- opacity: Equivalent to using setOpacity i.e. the opacity of the entire marker icon changes.
- color: Monochromatically sets the icon border color, interior color and inner circle border color
- iconOptions: A dictionary of specific icon options to change. These may be any SVGIcon option.
If "color" and "iconOptions" are specified, "iconOptions.color" is set to "color".
Advanced Customization
Modifying the icon's shape
The body of the icon is drawn using an SVG path. The shape may be changed by replacing the _createPathDescription method of L.DivIcon.SVGIcon to return a different path description i.e. the path drawing instructions. Please see the Mozilla Developer Network's SVG Path Tutorial for more information on SVG paths.
This repository includes an example L.DivIcon.SVGIcon.RhombusIcon subclass and accompanying convenience L.Marker.SVGMarker.RhombusMarker subclass.
Disabling the icon's inner circle or text
By default, the icon has a semi-transparent body with an opaque white circle in order to increase visibility and allow for a small amount of easily legible text. If you don't need the circle, the simplest way to exclude it is to set "circleRatio" to 0 which will result in a circle with a radius of zero.
If you will be creating a large number of icons or writing a subclass that doesn't need either the circle or displayed text, generating the circle and text elements can be disabled entirely by either overridding _createCircle/_createText to return an empty string or overriding _createSVG to exclude calling the creation methods for the unneeded elements.