All files / app/codeCharta/ui/codeMap/rendering codeMapGeometricDescription.ts

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import { CodeMapBuilding } from "./codeMapBuilding"
import { Vector3, Ray, Box3 } from "three"
import { Scaling } from "../../../codeCharta.model"
 
export class CodeMapGeometricDescription {
    private _buildings: CodeMapBuilding[] // todo tk: depending on how many buildings, refactor this to { [node.path]: node } might give `this.getBuildingByPath` a performance boost
    private mapSize: number
    private scales: Vector3
 
    constructor(mapSize: number) {
        this._buildings = new Array<CodeMapBuilding>()
        this.mapSize = mapSize
        this.scales = new Vector3(1, 1, 1)
    }
 
    add(building: CodeMapBuilding) {
        this._buildings.push(building)
    }
 
    get buildings() {
        return this._buildings
    }
 
    setScales(scales: Scaling) {
        this.scales = new Vector3(scales.x, scales.y, scales.z)
    }
 
    getBuildingByPath(path: string) {
        return this.buildings.find(x => x.node.path === path)
    }
 
    intersect(ray: Ray) {
        let intersectedBuilding: CodeMapBuilding
        let leastIntersectedDistance = Number.POSITIVE_INFINITY
 
        const boxTranslation = this.scales
            .clone()
            .multiplyScalar(this.mapSize)
            .multiply(new Vector3(-1, 0, -1))
 
        for (const building of this._buildings) {
            const box: Box3 = building.boundingBox.clone()
            box.min.multiply(this.scales)
            box.max.multiply(this.scales)
            box.translate(boxTranslation)
 
            Iif (this.rayIntersectsAxisAlignedBoundingBox(ray, box)) {
                const intersectionPoint: Vector3 = ray.intersectBox(box, new Vector3())
 
                Iif (intersectionPoint) {
                    const intersectionDistance = intersectionPoint.distanceTo(ray.origin)
 
                    Iif (intersectionDistance < leastIntersectedDistance) {
                        leastIntersectedDistance = intersectionDistance
                        intersectedBuilding = building
                    }
                }
            }
        }
 
        return intersectedBuilding
    }
 
    private rayIntersectsAxisAlignedBoundingBox(ray: Ray, box: Box3) {
        const tx1 = (box.min.x - ray.origin.x) * (1 / ray.direction.x)
        const tx2 = (box.max.x - ray.origin.x) * (1 / ray.direction.x)
 
        let tmin = Math.min(tx1, tx2)
        let tmax = Math.max(tx1, tx2)
 
        const ty1 = (box.min.y - ray.origin.y) * (1 / ray.direction.y)
        const ty2 = (box.max.y - ray.origin.y) * (1 / ray.direction.y)
 
        tmin = Math.max(tmin, Math.min(ty1, ty2))
        tmax = Math.min(tmax, Math.max(ty1, ty2))
 
        return tmax >= tmin
    }
}