code: public function setOptions($options = array()){
  
  		$this->options = array_merge($this->options, $options);
  
  		$this->xmlDocument->defs[0]->font[0]['id'] = $this->options['id'];
  		$this->xmlDocument->defs[0]->font[0]['horiz-adv-x'] = $this->options['horiz-adv-x'];
  		$this->xmlDocument->defs[0]->font[0]->{'font-face'}[0]['units-per-em'] = $this->options['units-per-em'];
  		$this->xmlDocument->defs[0]->font[0]->{'font-face'}[0]['ascent'] = $this->options['ascent'];
  		$this->xmlDocument->defs[0]->font[0]->{'font-face'}[0]['descent'] = $this->options['descent'];
  		$this->xmlDocument->defs[0]->font[0]->{'font-face'}[0]['x-height'] = $this->options['x-height'];
  		$this->xmlDocument->defs[0]->font[0]->{'font-face'}[0]['cap-height'] = $this->options['cap-height'];
  		$this->xmlDocument->defs[0]->font[0]->{'missing-glyph'}[0]['horiz-adv-x'] = $this->options['horiz-adv-x'];
  
  	}
docs: set font optinos
  
  @param array $options font options