_setMacroSaccade()

in src/core/PointOfInterestFeature.js [523:580]
51 lines of code
11 McCabe index (conditional complexity)

  _setMacroSaccade(layerName) {
    const layer = this._managedLayers[layerName];
    const { macroSaccade } = layer;
    let macroSaccadeWaitRange;

    // Increase random value range when not focused on a target
    if (!this._target) {
      macroSaccadeWaitRange = MacroSaccadeWaitRanges.default;

      // Normal human horizontal eye rotation limit is about 35 degrees
      const hLimit = Utils.getRandomFloat(.143, .286);
      const hFactor = Utils.getRandomFloat(-hLimit, hLimit);
      macroSaccade.h = hFactor * 35;

      // Normal human vertical eye rotation limit is about 25 degrees upward and 30 degrees downward
      const vLimit = Utils.getRandomFloat(.093, .186);
      const vFactor = Utils.getRandomFloat(-vLimit, vLimit);
      macroSaccade.v = vFactor > 0 ? vFactor * 25 : vFactor * 30;
    }

    // Pick a new face target
    else {
      // Social triangle - saccade between eyes and mouth, weighted to look at eyes more often
      switch (layer.saccadeTarget) {
        case 1:
          macroSaccadeWaitRange = MacroSaccadeWaitRanges.eyeTarget;
          layer.saccadeTarget = Math.random() < 0.75 ? FaceTargetTypes.EyeRight
            : FaceTargetTypes.Mouth;
          break;
        case 2:
          macroSaccadeWaitRange = MacroSaccadeWaitRanges.eyeTarget;
          layer.saccadeTarget = Math.random() < 0.75 ? FaceTargetTypes.EyeLeft
            : FaceTargetTypes.Mouth;
          break;
        case 3:
          macroSaccadeWaitRange = MacroSaccadeWaitRanges.mouthTarget;
          layer.saccadeTarget = Math.random() < 0.5 ? FaceTargetTypes.EyeLeft
            : FaceTargetTypes.EyeRight;
          break;
        case 0:
        default:
          macroSaccadeWaitRange = MacroSaccadeWaitRanges.eyeTarget;
          layer.saccadeTarget = Math.random() < 0.5 ? FaceTargetTypes.EyeLeft
            : FaceTargetTypes.EyeRight;
          break;
      }

      const { h, v } = this._getFaceTargetAngles(layer.saccadeTarget);
      macroSaccade.h = h;
      macroSaccade.v = v;
    }

    this._updateLayerSpeed(layerName, macroSaccade.h, macroSaccade.v);

    // Restart the timers
    this._initializeMicroTimer(layerName, ...MicroSaccadeWaitRanges.postMacro);
    this._initializeMacroTimer(layerName, ...macroSaccadeWaitRange);
  }