leaflet-semirings

Leaflet-Semicircle.
-------------------

Allows drawing semicircles on leaflet maps.

It's an extension of Leaflet's L.Circle,
and behaves like L.Circle if the a semicircle of almost 360 degrees is displayed.

Updated for use with leaflet 1.1.0.

Provided classes: ##

Provided methods: ##

L.SemiCircle/ L.SemiCircleMarker factories: L.semiCircle/L.SemiCircleMarker

Options: startAngle: start angle of the semicircle stopAngle: stop angle of the semicircle Angles are defined like compass courses: 0 = north, 90 = east, etc. innerRadius: defines an inner radius to display a ring instead of a circle ringWidth: set thickness of the ring, if set it overwrites the innerRadius

L.SemiCircle.setStartAngle(angle)	Set the start angle of the circle to angle and redraw.
L.Circle.setStopAngle(angle)	Set the stop angle of the circle to angle and redraw.
L.Circle.setDirection(direction, size)	Set the startAngle to direction - (0.5 size) and the stopAngle to direction + (0.5 size) and redraw.

Usage:

The plugin provides two ways to only display a part of the circle:
1. Use the options map and set startAngle and stopAngle.
3. Use the options the option innerRadius or ringWidth to draw a ring instead of a circle.
2. Use setDirection(direction, size) to display a semicircle of size degrees at direction.

Example:

Live demo

Using options.startAngle and options.stopAngle:
``js
L.semiCircle([51.5, -0.09], {
radius: 500,
startAngle: 45,
stopAngle: 135
}).addTo(map);
`

Draw the same semicircle using setDirection(direction, size):
`js
L.semiCircle([51.5, -0.09], {radius: 500})
.setDirection(90, 90)
.addTo(map);
`

Draw the same semicircle using as a ring:
`js
L.semiCircle([51.5, -0.09], {
radius: 500,
innerRadius: 300,
//// same as:
// ringWidth: 200,
startAngle: 45,
stopAngle: 135
}).addTo(map);
`

Screenshot:

Live demo

!Semicircles screenshot

$3

Live demo

!Semicircles screenshot

Changelog

$3

- Fixed #24: instance check for canvas renderer

$3

- Fixed #14: Poleward displacement of circle center when radius is large.

$3

- Changed the API to stand-alone classes rather than overwriting L.Circle` with an extension of itself.
- Added support for Leaflet 1.1.0