function Min() { $m = parent::Min(); if ($m[1] > 0) { $m[1] = $this->ymin; } return $m; }
function Min() { $m = parent::Min(); if ($m[1] >= $this->ybase) { $m[1] = $this->ybase; } return $m; }
function Min() { $m = parent::Min(); $m[1] = min($m[1], $this->ymin); return $m; }