jsts
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A JavaScript library of spatial predicates and functions for processing geometry
52 lines (48 loc) • 1.93 kB
JavaScript
import Coordinate from '../geom/Coordinate.js'
import IllegalArgumentException from '../../../../java/lang/IllegalArgumentException.js'
export default class Quadrant {
static isNorthern(quad) {
return quad === Quadrant.NE || quad === Quadrant.NW
}
static isOpposite(quad1, quad2) {
if (quad1 === quad2) return false
const diff = (quad1 - quad2 + 4) % 4
if (diff === 2) return true
return false
}
static commonHalfPlane(quad1, quad2) {
if (quad1 === quad2) return quad1
const diff = (quad1 - quad2 + 4) % 4
if (diff === 2) return -1
const min = quad1 < quad2 ? quad1 : quad2
const max = quad1 > quad2 ? quad1 : quad2
if (min === 0 && max === 3) return 3
return min
}
static isInHalfPlane(quad, halfPlane) {
if (halfPlane === Quadrant.SE)
return quad === Quadrant.SE || quad === Quadrant.SW
return quad === halfPlane || quad === halfPlane + 1
}
static quadrant() {
if (typeof arguments[0] === 'number' && typeof arguments[1] === 'number') {
const dx = arguments[0], dy = arguments[1]
if (dx === 0.0 && dy === 0.0) throw new IllegalArgumentException('Cannot compute the quadrant for point ( ' + dx + ', ' + dy + ' )')
if (dx >= 0.0)
if (dy >= 0.0) return Quadrant.NE; else return Quadrant.SE
else
if (dy >= 0.0) return Quadrant.NW; else return Quadrant.SW
} else if (arguments[0] instanceof Coordinate && arguments[1] instanceof Coordinate) {
const p0 = arguments[0], p1 = arguments[1]
if (p1.x === p0.x && p1.y === p0.y) throw new IllegalArgumentException('Cannot compute the quadrant for two identical points ' + p0)
if (p1.x >= p0.x)
if (p1.y >= p0.y) return Quadrant.NE; else return Quadrant.SE
else
if (p1.y >= p0.y) return Quadrant.NW; else return Quadrant.SW
}
}
}
Quadrant.NE = 0
Quadrant.NW = 1
Quadrant.SW = 2
Quadrant.SE = 3