Divide circle into slices and tell what slice a point is in.
npm install pie-slice --save
var pieSlice = require('pie-slice')
var slices = pieSlice.slice(4)
var ref = {x: 0, y: 0}
slices.whatSlice(ref, {x: 1, y: 1}) // => 1
slices.whatSlice(ref, {x: -1, y: -1}) // => 2Must be Number between 2 and 360, inclusive.
Object that may contain:
firstSliceFacesUp
(default: false)
When false the first slice starts at angle 0.
pieSlice.slice(4, {
firstSliceFacesUp: false
})
// or just
pieSlice.slice(4)When true first slice is bissected by angle 0.
pieSlice.slice(4, {
firstSliceFacesUp: true
});yDown
(default: false)
When true, points are interpretted based on y-down coordinates. In y-down coordinates the y values increase going downward.
When false, uses y-up coordinates. In y-up coordinates the y values increase going upward.
Slices of a pie.
Object with x and y Number properties. Treated as center of the sliced pie.
Object with x and y Number properties.
Number between 0 and sliceCount - 1 that is the answer to: if referencePoint is center of pie, what slice is otherPoint in?
Slice numbers increase going clockwise.
MIT