@pmndrs/handle/dist/state.js

framework agnostic expandable handle implementation for threejs

import { Euler } from 'three';
class SubtractedHandleTransformStateImpl {
    t1;
    t2;
    _position;
    _quaternion;
    _rotation;
    _scale;
    constructor(t1, t2) {
        this.t1 = t1;
        this.t2 = t2;
    }
    get time() {
        return this.t1.time - this.t2.time;
    }
    get position() {
        return (this._position ??= this.t1.position.clone().sub(this.t2.position));
    }
    get quaternion() {
        return (this._quaternion ??= this.t2.quaternion.clone().invert().premultiply(this.t1.quaternion));
    }
    get rotation() {
        return (this._rotation ??= new Euler().setFromQuaternion(this.quaternion));
    }
    get scale() {
        return (this._scale ??= this.t1.scale.clone().sub(this.t2.scale));
    }
}
export class HandleStateImpl {
    cancel;
    previous;
    memo;
    event;
    //will be set by start before the first read
    initial;
    current;
    first;
    last;
    //cache
    _delta;
    _offset;
    constructor(cancel) {
        this.cancel = cancel;
    }
    start(event, current) {
        this.event = event;
        this.previous = undefined;
        this.current = current;
        this.initial = current;
        this.first = true;
        this.last = false;
        this.memo = undefined;
        this._delta = undefined;
        this._offset = undefined;
    }
    update(event, current) {
        this.event = event;
        this.previous = this.current;
        this.current = current;
        this.first = false;
        this.last = false;
        this._delta = undefined;
        this._offset = undefined;
    }
    end(event) {
        this.event = event;
        this.first = false;
        this.last = true;
        this._delta = undefined;
        this._offset = undefined;
    }
    get delta() {
        if (this.previous == null) {
            return undefined;
        }
        return (this._delta ??= new SubtractedHandleTransformStateImpl(this.current, this.previous));
    }
    get offset() {
        return (this._offset ??= new SubtractedHandleTransformStateImpl(this.current, this.initial));
    }
}