Fill a region with a repeating pattern.
Offsets parameters are relative to the origin (0, 0) and not to the rectangle. So be carefull about the origin of pattern
and this extents.
| this |
a Buffer |
| rect |
the region of this to fill |
| pattern |
a Buffer to be repeated as a pattern |
| x_offset |
where the pattern starts horizontally |
| y_offset |
where the pattern starts vertical |