function fromLLtoPixel($lon, $lat, $zoom)
{
$d = $this->zc[$zoom];
$e = round($d + $lon * $this->Bc[$zoom]);
$f = minmax(sin(M_PI / 180.0 * $lat), -0.9999, 0.9999);
$g = round($d + 0.5 * log((1 + $f) / (1 - $f)) * -$this->Cc[$zoom]);
return array($e, $g);
}
function clip($num, $min, $max)
{
return minmax($num, $max, $min);
}
