public function drawHeader()
{
if (!isset($this->header)) {
$str = $this->items[0]['hostname'] . NAME_DELIMITER . $this->items[0]['name'];
} else {
$str = CMacrosResolverHelper::resolveGraphName($this->header, $this->items);
}
if ($this->period) {
$str .= $this->period2str($this->period);
}
// calculate largest font size that can fit graph header
// TODO: font size must be dynamic in other parts of the graph as well, like legend, timeline, etc
for ($fontsize = 11; $fontsize > 7; $fontsize--) {
$dims = imageTextSize($fontsize, 0, $str);
$x = $this->fullSizeX / 2 - $dims['width'] / 2;
// most important information must be displayed, period can be out of the graph
if ($x < 2) {
$x = 2;
}
if ($dims['width'] <= $this->fullSizeX) {
break;
}
}
imageText($this->im, $fontsize, 0, $x, 24, $this->getColor($this->graphtheme['textcolor'], 0), $str);
}