code: public void setIdentity() {
  		this.path = null;
  		this.firstSegmentDirection = detectFirstSegmentDirection(null);
  		this.curvilineTranslation = 0.;
  		this.shiftTranslation = 0.;
          this.isIdentity = Boolean.TRUE;
  	}
docs: Set this transformation as identify, ie all set to zero and no path.