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- import Coordinate from '../geom/Coordinate'
- import IllegalArgumentException from '../../../../java/lang/IllegalArgumentException'
- 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
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