livecodingspace-app/public/vwf/model/aframe/addon/aframe-interpolation.js

/* 
The MIT License (MIT)
Copyright (c) 2017 Nikolai Suslov
For using in LiveCoding.space and A-Frame 0.8.x

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

/* globals AFRAME, performance, THREE */

if (typeof AFRAME === 'undefined') {
  throw new Error('Component attempted to register before AFRAME was available.');
}

AFRAME.registerComponent('interpolation', {
  schema: {
    enabled: { default: true },
    deltaPos: { default: 0.001 },
    deltaRot: { default: 0.1 }
  },

  init: function () {

    this.driver = vwf.views["vwf/view/aframeComponent"];

  },

  update: function (oldData) {

    if (!this.interpolation) {
      this.deltaPos = parseFloat(this.data.deltaPos);
      this.deltaRot = THREE.Math.degToRad(parseFloat(this.data.deltaRot));

      this.enabled = JSON.parse(this.data.enabled);
      if (this.enabled) {
      }
    }
  },

  /**
   * Called when a component is removed (e.g., via removeAttribute).
   * Generally undoes all modifications to the entity.
   */
  remove: function () { },

  /**
   * Called on each scene tick.
   */
  tick: function (t, dt) {

    if (!this.node) {
      let interNode = Object.entries(this.driver.state.nodes).find(el => 
        el[1].parentID == this.el.id && el[1].extendsID == "http://vwf.example.com/aframe/interpolation-component.vwf"
      );
      this.node = this.driver.nodes[interNode[0]];
      this.nodeState = interNode[1];
    }

    if (this.enabled && this.node && this.node.interpolate) {

      this.setInterpolatedTransforms(dt);
      //this.restoreTransforms();

    }

  },

  vecCmp: function (a, b, delta) {

    let distance = a.distanceTo(b);
    if (distance > delta) {
      return false;
    }

    return true;
  },

  restoreTransforms: function () {

    let r = new THREE.Euler();
    let rot = r.copy(this.node.interpolate.rotation.selfTick);

    if (rot && this.node.needTransformRestore) {
      this.el.object3D.rotation.set(rot.x, rot.y, rot.z)
      this.node.needTransformRestore = false;
    }

  },

  setInterpolatedTransforms: function (deltaTime) {

    var step = (this.node.tickTime) / (this.driver.realTickDif);
    step = Math.min(step, 1);
    deltaTime = Math.min(deltaTime, this.driver.realTickDif)
    this.node.tickTime += deltaTime || 0;

    this.interpolatePosition(step);
    this.interpolateRotation(step);

  },
  radians: function (degrees) {
    // return degrees * Math.PI / 180.0;
    return THREE.Math.degToRad(degrees)
  },

  interpolateRotation: function (step) {

    let last = this.node.interpolate.rotation.lastTick;
    let now = this.node.interpolate.rotation.selfTick;

    if (last && now) {

      let comp = this.vecCmp(last.toVector3(), now.toVector3(), this.deltaRot);

      if (!comp) {

        // console.log('Last:', last, ' Now: ', now);

        let lastV = (new THREE.Quaternion()).setFromEuler(new THREE.Euler(
          (last.x),
          (last.y),
          (last.z), 'YXZ'
        ));

        let nowV = (new THREE.Quaternion()).setFromEuler(new THREE.Euler(
          (now.x),
          (now.y),
          (now.z), 'YXZ'
        ));

        let q = new THREE.Quaternion();
        let e = new THREE.Euler();

        THREE.Quaternion.slerp(lastV, nowV, q, step || 0);
        let interp = e.setFromQuaternion(q, 'YXZ');

        this.el.object3D.rotation.set(interp.x, interp.y, interp.z);
        this.node.needTransformRestore = true;
      }
    }
  },

  interpolatePosition: function (step) {

    var last = this.node.interpolate.position.lastTick; //this.node.lastTickTransform;
    var now = this.node.interpolate.position.selfTick; //Transform;

    if (last && now) {

      let comp = this.vecCmp(last, now, this.deltaPos);

      if (!comp) {

        var lastV = (new THREE.Vector3()).copy(last);
        var nowV = (new THREE.Vector3()).copy(now);

        var interp = lastV.lerp(nowV, step || 0);
        //this.el.setAttribute('position',interp);

        this.el.object3D.position.set(interp.x, interp.y, interp.z);
        this.node.needTransformRestore = true;
      }
    }
  },
  pause: function () { },
  play: function () { }
});