/**
* @return PointSet
*/
public function produce()
{
$result = new PointSet();
foreach ($this->lowerLeft->forXTimes($this->width) as $x) {
foreach ($this->lowerLeft->forYTimes($this->height) as $y) {
$point = new Point($x, $y);
$value = $this->getValue($point);
$result->attach($point, $value);
}
}
return $result;
}