ItemModel(final Item item, final double arcStartR, final double arcEndR,
        final float arcStartD, final float arcEndD)
    {
      this.mItem = item;

      this.mArcStartR = arcStartR;
      this.mArcEndR = arcEndR;

      this.mArcStartD = arcStartD;
      this.mArcEndD = arcEndD;

      this.mArcStartSin = Math.sin(mArcStartR);
      this.mArcStartCos = Math.cos(mArcStartR);

      this.mArcEndSin = Math.sin(mArcEndR);
      this.mArcEndCos = Math.cos(mArcEndR);
      
      // ----------->
      double diff = Math.abs(Math.abs(this.mArcStartCos) - Math.abs(this.mArcEndCos));
      if ( diff <= 0.0001 )
      {
        this.mArcStartCos = -1.0;
        this.mArcEndCos = 1.0;
      }
       // ----------->
    }