makeGizmos method

dynamic makeGizmos(dynamic tbCenter, dynamic tbRadius)

• Creates the rotation gizmos matching trackball center and radius
  • @param {Vector3} tbCenter The trackball center
    • @param {number} tbRadius The trackball radius

Implementation

makeGizmos(tbCenter, tbRadius) {
  var curve = new EllipseCurve(0, 0, tbRadius, tbRadius);
  var points = curve.getPoints(this._curvePts);

  //geometry
  var curveGeometry = new BufferGeometry().setFromPoints(points);

  //material
  var curveMaterialX = new LineBasicMaterial(
      {'color': 0xff8080, 'fog': false, 'transparent': true, 'opacity': 0.6});
  var curveMaterialY = new LineBasicMaterial(
      {'color': 0x80ff80, 'fog': false, 'transparent': true, 'opacity': 0.6});
  var curveMaterialZ = new LineBasicMaterial(
      {'color': 0x8080ff, 'fog': false, 'transparent': true, 'opacity': 0.6});

  //line
  var gizmoX = new Line(curveGeometry, curveMaterialX);
  var gizmoY = new Line(curveGeometry, curveMaterialY);
  var gizmoZ = new Line(curveGeometry, curveMaterialZ);

  var rotation = Math.PI * 0.5;
  gizmoX.rotation.x = rotation;
  gizmoY.rotation.y = rotation;

  //setting state
  this
      ._gizmoMatrixState0
      .identity()
      .setPosition(tbCenter.x, tbCenter.y, tbCenter.z);
  this._gizmoMatrixState.copy(this._gizmoMatrixState0);

  if (this.camera.zoom != 1) {
    //adapt gizmos size to camera zoom
    var size = 1 / this.camera.zoom;
    this._scaleMatrix.makeScale(size, size, size);
    this
        ._translationMatrix
        .makeTranslation(-tbCenter.x, -tbCenter.y, -tbCenter.z);

    this
        ._gizmoMatrixState
        .premultiply(this._translationMatrix)
        .premultiply(this._scaleMatrix);
    this
        ._translationMatrix
        .makeTranslation(tbCenter.x, tbCenter.y, tbCenter.z);
    this._gizmoMatrixState.premultiply(this._translationMatrix);
  }

  this._gizmoMatrixState.decompose(
      this._gizmos.position, this._gizmos.quaternion, this._gizmos.scale);

  this._gizmos.clear();

  this._gizmos.add(gizmoX);
  this._gizmos.add(gizmoY);
  this._gizmos.add(gizmoZ);
}